Method, device, equipment and storage medium for determining threshold information of pore parameters

Abstract

The present application provides a method, device, equipment and storage medium for determining threshold information of pore parameters, which belongs to the technical field of oil and gas development. The method includes: determining the minimum porosity and permeability parameters of the oil and gas layer according to the pore parameters, permeability parameters and production parameters of the first sample core, determining multiple target cores from multiple test cores according to the pore parameters and bound water saturation parameters of the second sample core; determining at least one first target core whose porosity and permeability parameters are not less than the minimum porosity and permeability parameters and at least one second target core whose porosity and permeability parameters are less than the minimum porosity and permeability parameters from multiple target cores according to the minimum porosity and permeability parameters, and determining the threshold information based on the reserves of at least one first target core and the reserves of at least one second target core. Since the contribution and influence of the reserves of the first target core and the second target core on the oil and gas reserves of the oil and gas layer are comprehensively considered, the accuracy of the threshold information of the determined pore parameters is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas development, and in particular to a method, device, equipment and storage medium for determining threshold information of pore parameters. Background Art

[0002] Before developing an oil and gas layer, it is necessary to determine whether the geological reserves of the oil and gas layer meet the development conditions, and then develop the oil and gas layer that meets the development conditions. At present, the geological reserves of oil and gas layers are generally determined by volumetric method, and before determining the geological reserves of oil and gas layers by volumetric method, it is necessary to determine the lower limit of porosity of the oil and gas layer.

[0003] In the related art, the method for determining the lower limit of the porosity of an oil and gas layer is as follows: obtaining test data from multiple test points in the area where the oil and gas layer is located, the test data including the simulated daily production and porosity corresponding to the core at the test point location; based on the simulated daily production and porosity corresponding to the core at each test point location, determining the relationship data between the simulated daily production and the porosity through a direct proportional function; determining the qualified daily production of the area where the oil and gas layer is located, and then determining the lower limit of the porosity of the oil and gas layer through the qualified daily production and the relationship data.

[0004] However, the positive correlation between the porosity of the oil and gas layer and the simulated daily production is only suitable for homogeneous oil and gas layers. For heterogeneous oil and gas layers, since the positive correlation between the porosity of the oil and gas layer and the simulated daily production is poor, the porosity and the simulated daily production are not in direct proportion. Therefore, the relationship data determined by the direct proportional function in the above-mentioned related technology is inaccurate, which leads to low accuracy of the lower limit of the porosity of the oil and gas layer determined by the relationship data. Summary of the invention

[0005] The embodiment of the present application provides a method, device, equipment and storage medium for determining threshold information of pore parameters, which can improve the accuracy of the determined lower limit of porosity of oil and gas layers. The technical solution is as follows:

[0006] In one aspect, the present application provides a method for determining threshold information of a pore parameter, the method comprising:

[0007] determining a plurality of first sample cores, a plurality of second sample cores, and a plurality of test cores within the oil and gas layer to be tested;

[0008] For each first sample core, determine the pore parameters, permeability parameters and production parameters of the first sample core, and, for each second sample core, determine the pore parameters and irreducible water saturation parameters of the second sample core;

[0009] Determining the minimum porosity and permeability parameter of the oil and gas layer according to the pore parameters, permeability parameters and production parameters of the first sample core, and determining a plurality of target cores from the plurality of test cores according to the pore parameters and irreducible water saturation parameters of the second sample core;

[0010] According to the minimum porosity and permeability accumulation parameter, at least one first target core and at least one second target core are determined from the multiple target cores, wherein the first target core is a target core whose porosity and permeability accumulation parameter is not less than the minimum porosity and permeability accumulation parameter, and the second target core is a target core whose porosity and permeability accumulation parameter is less than the minimum porosity and permeability accumulation parameter;

[0011] Determine the reserves of the at least one first target core and the reserves of the at least one second target core, and determine threshold information of the pore parameters of the oil and gas layer based on the reserves of the at least one first target core and the reserves of the at least one second target core.

[0012] In a possible implementation, determining the minimum porosity and permeability parameter of the oil and gas layer according to the pore parameter, permeability parameter and production parameter of the first sample core includes:

[0013] Determine the qualified production of the oil and gas layer and the porosity and permeability parameters of the first sample core, wherein the porosity and permeability parameters of any first sample core are the product of the pore parameter and the permeability parameter of the first sample core;

[0014] Determine first relationship data according to the production parameter and the porosity and permeability parameter of the first sample core, wherein the first relationship data is used to represent the relationship between the production parameter and the porosity and permeability parameter;

[0015] The minimum porosity parameter of the oil and gas layer is determined according to the first relationship data and the qualified production of the oil and gas layer.

[0016] In another possible implementation, determining the first relationship data according to the production parameter and the porosity and permeability parameter of the first sample core includes:

[0017] Input the production parameter and porosity parameter of each core into the following formula 1, determine the first parameter and the second parameter in the formula 1, and obtain the first relationship data;

[0018] Formula 1:

[0019] Wherein, q represents the yield parameter, represents the porosity parameter, a represents the first parameter, and b represents the second parameter.

[0020] In another possible implementation, determining a plurality of target cores from the plurality of test cores according to the pore parameters and irreducible water saturation parameters of the second sample cores includes:

[0021] Determining second relationship data between the pore parameter and the irreducible water saturation parameter according to the pore parameter and the irreducible water saturation parameter of the second sample core, wherein the second relationship data is used to indicate a negative correlation between the pore parameter and the irreducible water saturation parameter;

[0022] determining a minimum pore parameter of the oil and gas layer according to a maximum irreducible water saturation parameter of the oil and gas layer and the second relationship data;

[0023] The pore parameters of the plurality of test cores are determined, and a plurality of target cores having pore parameters not less than the minimum pore parameter are determined from the plurality of test cores.

[0024] In another possible implementation, determining the second relationship data between the pore parameter and the irreducible water saturation parameter according to the pore parameter and the irreducible water saturation parameter of the second sample core includes:

[0025] Input the pore parameters and irreducible water saturation parameters of the second sample core into the following formula 2, determine the third parameter and the fourth parameter in the formula 2, and obtain the second relationship data;

[0026] Formula 2:

[0027] Among them, S w represents the irreducible water saturation parameter, represents the pore parameter, c represents the third parameter, and d represents the fourth parameter.

[0028] In another possible implementation, the determining the reserve of the at least one first target core and the reserve of the at least one second target core includes:

[0029] For each first target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the first target core; and determine the reserves of the first target core by the following formula 3 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the first target core, to obtain the reserves of the at least one first target core;

[0030] Formula 3:

[0031] as well as,

[0032] For each second target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core; and determine the reserves of the second target core by the following formula 4 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, to obtain the reserves of the at least one second target core;

[0033] Formula 4:

[0034] Among them, A 1 represents the oil and gas area of ​​the first target core, h 1 represents the effective reservoir thickness of the first target core, B 1 represents the volume coefficient of the first target core, represents the pore parameters of the first target core, represents the reserves of the first target core, S w1 represents the irreducible water saturation parameter of the first target core, A 2 represents the oil and gas area of ​​the second target core, h 2 represents the effective reservoir thickness of the second target core, B 2 represents the volume coefficient of the second target core, represents the pore parameters of the second target core, represents the reserves of the second target core, S w2 represents the irreducible water saturation parameter of the second target core.

[0035] In another possible implementation, determining the threshold information of the pore parameters of the oil and gas layer based on the reserves of the at least one first target core and the reserves of the at least one second target core includes:

[0036] According to the pore parameter of each first target core, the at least one first target core is sorted from small to large according to the pore parameter, and a first total reserve of the sorted plurality of first target cores is determined, wherein the first total reserve is the sum of the reserves of the plurality of first target cores whose pore parameters are less than a preset parameter;

[0037] According to the pore parameter of each second target core, the at least one second target core is sorted from large to small according to the pore parameter, and a second total reserve of the sorted plurality of second target cores is determined, wherein the second total reserve is the sum of the reserves of the plurality of second target cores whose pore parameters are not less than the preset parameter;

[0038] Determine a target preset parameter corresponding to when the first total reserves and the second total reserves are the same, and determine that the target preset parameter is threshold information of a pore parameter of the oil and gas layer.

[0039] On the other hand, the present application provides a device for determining threshold information of pore parameters, the device comprising:

[0040] A first determination module, used to determine a plurality of first sample cores, a plurality of second sample cores, and a plurality of test cores in the oil and gas layer to be tested;

[0041] A second determination module is used to determine, for each first sample core, a pore parameter, a permeability parameter and a production parameter of the first sample core, and, for each second sample core, to determine a pore parameter and a bound water saturation parameter of the second core;

[0042] a third determination module, for determining the minimum porosity and permeability parameter of the oil and gas layer according to the pore parameter, permeability parameter and production parameter of the first sample core, and determining a plurality of target cores from the plurality of test cores according to the pore parameter and irreducible water saturation parameter of the second sample core;

[0043] a fourth determination module, configured to determine at least one first target core and at least one second target core from the plurality of target cores according to the minimum porosity and permeability accumulation parameter, wherein the first target core is a target core having a porosity and permeability accumulation parameter not less than the minimum porosity and permeability accumulation parameter, and the second target core is a target core having a porosity and permeability accumulation parameter less than the minimum porosity and permeability accumulation parameter;

[0044] The fifth determination module is used to determine the reserves of the at least one first target core and the reserves of the at least one second target core, and determine the threshold information of the pore parameters of the oil and gas layer based on the reserves of the at least one first target core and the reserves of the at least one second target core.

[0045] In a possible implementation, the third determination module is used to determine the qualified production of the oil and gas layer and the porosity accumulation parameter of the first sample core, the porosity accumulation parameter of any first sample core being the product of the pore parameter and the permeability parameter of the first sample core; first relationship data is determined based on the production parameter and the porosity accumulation parameter of the first sample core, the first relationship data being used to represent the relationship between the production parameter and the porosity accumulation parameter; and the minimum porosity accumulation parameter of the oil and gas layer is determined based on the first relationship data and the qualified production of the oil and gas layer.

[0046] In another possible implementation, the third determination module is used to input the production parameter and the porosity and permeability parameter of the first sample core into the following formula 1, determine the first parameter and the second parameter in the formula 1, and obtain the first relationship data;

[0047] Formula 1:

[0048] Wherein, q represents the yield parameter, represents the porosity parameter, a represents the first parameter, and b represents the second parameter.

[0049] In another possible implementation, the third determination module is used to determine second relationship data between the pore parameter and the irreducible water saturation parameter based on the pore parameter and the irreducible water saturation parameter of the second sample core, wherein the second relationship data is used to represent the negative correlation between the pore parameter and the irreducible water saturation parameter; determine the minimum pore parameter of the oil and gas layer based on the maximum irreducible water saturation parameter of the oil and gas layer and the second relationship data; determine the pore parameters of the multiple test cores, and determine multiple target cores whose pore parameters are not less than the minimum pore parameter from the multiple test cores.

[0050] In another possible implementation, the third determination module is used to input the pore parameter and irreducible water saturation parameter of the second sample core into the following formula 2, determine the third parameter and the fourth parameter in the formula 2, and obtain the second relationship data;

[0051] Formula 2:

[0052] Among them, S w represents the irreducible water saturation parameter, represents the pore parameter, c represents the third parameter, and d represents the fourth parameter.

[0053] In another possible implementation, the fifth determination module is used to determine, for each first target core, the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter, and pore parameter of the first target core, and determine the reserves of the first target core by the following formula 3 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter, and pore parameter of the first target core, to obtain the reserves of the at least one first target core;

[0054] Formula 3:

[0055] as well as,

[0056] For each second target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core; and determine the reserves of the second target core by the following formula 4 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, to obtain the reserves of the at least one second target core;

[0057] Formula 4:

[0058] Among them, A 1 represents the oil and gas area of ​​the first target core, h 1 represents the effective reservoir thickness of the first target core, B 1 represents the volume coefficient of the first target core, represents the pore parameters of the first target core, represents the reserves of the first target core, S w1 represents the irreducible water saturation parameter of the first target core, A 2 represents the oil and gas area of ​​the second target core, h 2 represents the effective reservoir thickness of the second target core, B 2 represents the volume coefficient of the second target core, represents the pore parameters of the second target core, represents the reserves of the second target core, S w2 represents the irreducible water saturation parameter of the second target core.

[0059] In another possible implementation, the fifth determination module is used to sort the at least one first target core from small to large according to the pore parameter of each first target core, and determine a first total reserve of the sorted multiple first target cores, wherein the first total reserve is the sum of the reserves of the multiple first target cores whose pore parameters are less than the preset parameter; sort the at least one second target core from large to small according to the pore parameter of each second target core, and determine a second total reserve of the sorted multiple second target cores, wherein the second total reserve is the sum of the reserves of the multiple second target cores whose pore parameters are not less than the preset parameter; determine the target preset parameter corresponding to the first total reserve and the second total reserve when the first total reserve is the same, and determine that the target preset parameter is the threshold information of the pore parameter of the oil and gas layer.

[0060] On the other hand, an embodiment of the present application provides a computer device, comprising: a processor and a memory, wherein at least one program code is stored in the memory, and the at least one program code is loaded and executed by the processor to implement the operations performed in the method for determining the threshold information of the pore parameters of any possible implementation method described above.

[0061] On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which at least one program code is stored, and the at least one program code is loaded and executed by a processor to implement the operations performed in the method for determining the threshold information of the pore parameters of any possible implementation method mentioned above.

[0062] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0063] The embodiment of the present application provides a method for determining threshold information of pore parameters. On the one hand, effective cores whose pore accumulation parameters are not less than the minimum pore accumulation parameter and invalid cores whose pore accumulation parameters are less than the minimum pore accumulation parameter are determined from multiple cores in the oil and gas layer through the minimum pore accumulation parameter of the oil and gas layer, and the minimum pore accumulation parameter of the oil and gas layer is determined through the two dimensions of porosity and permeability of the oil and gas layer, so the accuracy of determining effective cores and invalid cores is improved; on the other hand, the porosity corresponding to the oil and gas reserves of the effective cores when the reserves are the same as the oil and gas reserves of the invalid cores is determined as the lower limit of the porosity, which can make the oil and gas reserves of the invalid cores included in the effective thickness section and the oil and gas reserves of the effective cores not included in the effective thickness section offset each other, so that the determined oil and gas reserves of the effective thickness section are closer to the true value. It can be seen from this that the embodiment of the present application can not only accurately determine the effective cores and invalid cores in the oil and gas layer from the two dimensions of porosity and permeability, but also comprehensively consider the contribution and influence of the reserves of effective cores and invalid cores on the oil and gas reserves of the oil and gas layer. Therefore, the threshold information of the determined pore parameters is closer to the actual lower limit of the porosity of the oil and gas layer, thereby improving the accuracy of the threshold information of the determined pore parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0065] Figure 1 is a flow chart showing a method for determining threshold information of a pore parameter according to an exemplary embodiment;

[0066] Figure 2is a schematic diagram showing a principle for determining threshold information of a pore parameter according to an exemplary embodiment;

[0067] Figure 3 is a schematic diagram showing a method of determining a corresponding target preset parameter when a first total reserve and a second total reserve are the same according to an exemplary embodiment;

[0068] Figure 4 is a block diagram of a device for determining threshold information of a pore parameter according to an exemplary embodiment;

[0069] Figure 5 It is a structural block diagram of a computer device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0070] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0071] Figure 1 FIG. 1 is a flow chart showing a method for determining threshold information of a pore parameter according to an exemplary embodiment. Figure 1 , the method comprising:

[0072] 101. A computer device determines a plurality of first sample cores, a plurality of second sample cores, and a plurality of test cores in an oil and gas layer to be tested.

[0073] The multiple test cores in the oil and gas layer to be tested may be uniformly selected or non-uniformly selected. In a possible implementation, the multiple test cores are uniformly selected. Accordingly, the step of the computer device determining the multiple test cores in the oil and gas layer to be tested is: the computer device determines a first preset distance between any two sampling points in the oil and gas layer, selects multiple sampling points from the oil and gas layer according to the first preset distance, and determines that the cores corresponding to the multiple sampling points are the multiple test cores in the oil and gas layer.

[0074] Among them, the first preset distance can be any value between 0.1m and 0.5m, for example, 0.1m, 0.2m, 0.5m, etc.; in the embodiment of the present application, the value of the first preset distance is not specifically limited and can be set and modified as needed.

[0075] Among them, the number of multiple test cores can be any value between 100-10000, for example, 300, 500, 800, etc.; in the embodiment of the present application, the number of multiple test cores is not specifically limited and can be set and modified as needed.

[0076] It should be noted that one sampling point can correspond to one test core or multiple test cores. When one sampling point corresponds to multiple test cores, the depth interval between any two test cores in the multiple test cores is the same. The depth interval can be any value between 0.3m and 1m, for example, 0.3m, 0.4m, 0.5m, etc.; in the embodiment of the present application, the value of the depth interval is not specifically limited and can be set and modified as needed.

[0077] In one possible implementation, the computer device randomly determines a plurality of first sample cores and a plurality of second sample cores from the plurality of test cores. In another possible implementation, the computer device determines the porosity of the plurality of test cores, determines the porosity distribution information of the plurality of test cores, and determines a plurality of first sample cores and a plurality of second sample cores from the plurality of test cores based on the porosity distribution information.

[0078] For example, the number of test cores is 100; the number of test cores with porosity between 0 and 1 is 50, the number of test cores with porosity between 1 and 2 is 30, the number of test cores with porosity between 2 and 3 is 20, and the number of test cores with porosity between 3 and 4 is 10. The computer device selects 5 first sample cores and 5 second sample cores from the test cores with porosity between 0 and 1; selects 3 first sample cores and 3 second sample cores from the test cores with porosity between 1 and 2; selects 2 first sample cores and 2 second sample cores from the test cores with porosity between 2 and 3; and selects 1 first sample core and 1 second sample core from the test cores with porosity between 3 and 4.

[0079] In another possible implementation, the computer device determines multiple regions within the oil and gas layer, selects at least one first sample core and at least one second sample core from each region, and obtains multiple first sample cores and multiple second sample cores. Optionally, the multiple regions have the same area, and the computer device divides the oil and gas layer into multiple regions of the same area based on the total area of ​​the oil and gas layer.

[0080] The number of multiple first sample cores can be any value between 10-50, for example, 10, 15, 20, etc.; the number of multiple second sample cores can be any value between 10-50, for example, 10, 15, 20, etc.; in the embodiment of the present application, the number of multiple first sample cores and multiple second sample cores is not specifically limited and can be set and modified as needed.

[0081] 102. The computer device determines, for each first sample core, a pore parameter, a permeability parameter, and a production parameter of the first sample core, and, for each second sample core, determines a pore parameter and a bound water saturation parameter of the second sample core.

[0082] In a possible implementation, the pore parameter includes porosity, the permeability parameter includes permeability, and the irreducible water saturation parameter includes irreducible water saturation.

[0083] In a possible implementation, the computer device determines the above parameters through testing. Accordingly, this step is: for each first sample core, the computer device determines the porosity of the first sample core through a porosity tester, determines the permeability of the first sample core through a permeability tester, and determines the production parameter of the first sample core through a full simulation production equipment; and, for each second sample core, determines the porosity of the second sample core through a porosity tester, and determines the bound water saturation of the second sample core through a mercury injection tester. Optionally, the production parameter of the first sample core can be the daily production corresponding to the first sample core.

[0084] One thing that needs to be explained is that the irreducible water saturation of the sample core can also be obtained by testing with a relative permeability tester. When the type of the sample core is suitable for determining the irreducible water saturation by a mercury injection tester, the computer equipment can also determine it through the relative permeability tester, thereby ensuring that the irreducible water saturation of all types of sample cores can be determined, thereby improving the adaptability of determining the irreducible water saturation.

[0085] In another possible implementation, for each first sample core and each second sample core, the tester obtains the pore parameters, permeability parameters and production parameters of the first sample core, as well as the pore parameters and bound water saturation parameters of the second sample core through testing, and uploads the above parameters to a computer device, which stores the above parameters to obtain the pore parameters, permeability parameters and production parameters of the first sample core, as well as the pore parameters and bound water saturation parameters of the second sample core.

[0086] 103. The computer device determines the minimum porosity and permeability parameters of the oil and gas layer based on the pore parameters, permeability parameters and production parameters of the first sample core, and determines multiple target cores from multiple test cores based on the pore parameters and bound water saturation parameters of the second sample core.

[0087] In a possible implementation, the steps of determining the minimum porosity and permeability parameters of the oil and gas layer by the computer device according to the pore parameters, permeability parameters and production parameters of the first sample core are as follows: the computer device determines the qualified production of the oil and gas layer and the porosity and permeability parameters of the first sample core, and the porosity and permeability parameters of any first sample core are the product of the porosity parameters and permeability parameters of the first sample core; determining first relationship data according to the production parameters and porosity and permeability parameters of the first sample core, and the first relationship data is used to represent the relationship between the production parameters and the porosity and permeability parameters; determining the minimum porosity and permeability parameters of the oil and gas layer according to the first relationship data and the qualified production of the oil and gas layer. Optionally, the porosity parameter is porosity, expressed in letters. The permeability parameter is the permeability, represented by the letter k, and the pore volume parameter is

[0088] In a possible implementation, the standard production is the reserve calculation standard of the buried depth of the oil and gas layer, and the corresponding relationship between the depth and the standard production is stored in the computer device. Accordingly, the step of the computer device obtaining the standard production of the oil and gas layer is: the computer device determines the depth of the oil and gas layer, and according to the depth of the oil and gas layer, determines the standard production corresponding to the depth of the oil and gas layer from the corresponding relationship between the stored depth and the standard production. Optionally, the standard production is the daily standard production.

[0089] In a possible implementation, the step of determining the first relationship data by the computer device according to the production parameter and the porosity and permeability parameter of the first sample core is as follows: the computer device inputs the production parameter and the porosity and permeability parameter of the first sample core into the following formula 1, determines the first parameter and the second parameter in the formula 1, and obtains the first relationship data;

[0090] Formula 1:

[0091] Among them, q represents the production parameter, represents the porosity parameter, a represents the first parameter, and b represents the second parameter.

[0092] It should be noted that the number of first sample cores is at least three, and the more the number of first sample cores is, the closer the first data parameter is to the actual situation. When the number of first sample cores is multiple, the computer device can use the average value of multiple first parameters as the final first parameter, and the average value of multiple second parameters as the final second parameter.

[0093] For example, the number of the first sample cores is 3, including core A, core B, and core C. The computer device determines the first parameter a according to core A and core B. 1 and the second parameter b 1 ; The computer device determines the first parameter a according to core A and core C 2and the second parameter b 2 ; The computer device determines the first parameter a according to the core B and the core C 3 and the second parameter b 3 ; The computer device determines the first parameter a 1 、a 2 and a 3 The average value is the final first parameter a; the computer device determines the second parameter b 1 、b 2 and b 3 The average value is the final second parameter b.

[0094] In a possible implementation, the step of determining the minimum porosity and permeability parameter of the oil and gas layer by a computer device based on the first relationship data and the standard production is as follows: the computer device inputs the standard production into the first relationship data, obtains a target porosity and permeability parameter corresponding to the standard production, and uses the target porosity and permeability parameter as the minimum porosity and permeability parameter of the oil and gas layer.

[0095] It should be noted that, under certain conditions such as production pressure difference, the simulated production of the oil and gas layer has a high positive correlation with the porosity product parameter. The production corresponding to the minimum porosity product parameter is the qualified production of the oil and gas layer. In this way, the minimum porosity product parameter of the oil and gas layer can be used to distinguish the effective cores and invalid cores included in the oil and gas layer, that is, the cores with porosity product parameters not less than the minimum porosity product parameter are effective cores, and the cores with porosity product parameters less than the minimum porosity product parameter are invalid cores.

[0096] In the embodiment of the present application, since a positive correlation is established between the simulated production and the porosity accumulation parameter, and the simulated production corresponding to the core with the minimum porosity accumulation parameter is the qualified production of the oil and gas layer, the simulated production corresponding to the core with a porosity accumulation parameter less than the minimum porosity accumulation parameter is less than the qualified production of the oil and gas layer, and the simulated production corresponding to the core with a porosity accumulation parameter not less than the minimum porosity accumulation parameter can reach or exceed the qualified production of the oil and gas layer, and the daily production of the well drilled into the oil and gas layer needs to be no less than the qualified production to have development value. Therefore, by distinguishing the effective cores and invalid cores included in the oil and gas layer through the minimum porosity accumulation parameter of the oil and gas layer, it can be ensured that the simulated production corresponding to the effective core is not less than the qualified production, so that the target oil and gas layer determined by the effective core has development value.

[0097] In a possible implementation, the steps of determining multiple target cores from multiple test cores by a computer device according to the pore parameters and irreducible water saturation parameters of the second sample core are as follows: the computer device determines second relationship data between the pore parameters and the irreducible water saturation parameters according to the pore parameters and the irreducible water saturation parameters of the second sample core, the second relationship data being used to represent the negative correlation between the pore parameters and the irreducible water saturation parameters; determining the minimum pore parameter of the oil and gas layer according to the maximum irreducible water saturation parameter of the oil and gas layer and the second relationship data; determining the pore parameters of multiple test cores, and determining multiple target cores whose pore parameters are not less than the minimum pore parameter from the multiple test cores.

[0098] In a possible implementation, the step of determining the second relationship data between the pore parameters and the irreducible water saturation parameters according to the pore parameters and the irreducible water saturation parameters of the second sample core by the computer device is as follows: the computer device inputs the pore parameters and the irreducible water saturation parameters of the second sample core into the following formula 2, determines the third parameter and the fourth parameter in the formula 2, and obtains the second relationship data;

[0099] Formula 2:

[0100] Among them, S w represents the bound water saturation parameter, represents the pore parameter, c represents the third parameter, and d represents the fourth parameter.

[0101] It should be noted that, for the pore parameter and bound water saturation parameter of a second sample core, for a third parameter and a fourth parameter, the more the number of second sample cores is, the closer the obtained second data parameter is to the actual situation. When there are multiple second sample cores, the computer device can use the average value of multiple third parameters as the final third parameter, and the average value of multiple fourth parameters as the final fourth parameter.

[0102] For example, the number of the second sample cores is 3, including core A, core B, and core C. The computer device determines the third parameter c according to core A and core B. 1 and the fourth parameter d 1 ; The computer device determines the third parameter c based on core A and core C 2 and the fourth parameter d 2 ; The computer device determines the third parameter c based on core B and core C 3 and the fourth parameter d 3 ; The computer device determines the third parameter c 1 、c 2 and c 3 The average value is the final third parameter c; the computer device determines the fourth parameter d 1 d 2and d 3 The average value of is the final fourth parameter d.

[0103] In a possible implementation, the step of determining the minimum pore parameter of the oil and gas layer by the computer device based on the maximum irreducible water saturation parameter of the oil and gas layer and the second relationship data is as follows: the computer device inputs the maximum irreducible water saturation parameter into the second relationship data to obtain the minimum pore parameter of the oil and gas layer.

[0104] One point that needs to be explained is that the minimum pore parameter is the pore parameter corresponding to the maximum bound water saturation parameter, and is the minimum pore parameter for oil and gas in the reservoir. When the reservoir pore parameter is less than or equal to the minimum pore parameter, all storage spaces in the reservoir are filled with bound water; when the reservoir pore parameter is not less than the minimum pore parameter, the reservoir has storage space other than bound water to store oil and gas, and has the prerequisite for development. In the embodiment of the present application, there is a negative correlation between the pore parameter and the bound water saturation parameter, and the pore parameter corresponding to the maximum bound water saturation parameter is determined to be the minimum pore parameter, thereby ensuring that the core that is not less than the minimum pore parameter is the target core that meets the development prerequisite. In one possible implementation, the maximum bound water saturation parameter is 100%.

[0105] Another point that needs to be explained is that the porosity of the oil and gas layer represents the size of the reservoir space of the oil and gas layer, and the permeability of the oil and gas layer represents the connectivity between the reservoir spaces. The simulated daily production is related to the reservoir space and the connectivity between the reservoir spaces, that is, the simulated daily production is related to the porosity and permeability of the oil and gas layer, and when conditions such as production pressure difference remain constant, the correlation between the simulated daily production and permeability is not less than the correlation with the porosity.

[0106] For homogeneous oil and gas layers, the permeability distribution of multiple areas in the oil and gas layer is uniform, the connectivity between the reservoir spaces is good, and the positive correlation between the porosity of the oil and gas layer and the simulated daily production is strong. At this time, the simulated daily production determined by the porosity is roughly the same as the simulated daily production determined by both the porosity and the permeability. However, for heterogeneous oil and gas layers, even if the reservoir space of the oil and gas layer is large, the simulated daily production will be small due to the low connectivity between the reservoir spaces. Therefore, the method of determining the lower limit of porosity by simulating the correlation between daily production and porosity in the prior art does not work in heterogeneous oil and gas layers.

[0107] When conditions such as production pressure difference remain constant, the simulated daily output has a high positive correlation with the porosity-permeability product parameter. In the embodiment of the present application, since the minimum porosity-permeability product parameter of the oil and gas layer is determined by the two dimensions of porosity and permeability of the oil and gas layer, the accuracy of determining the effective cores and invalid cores is improved, thereby improving the accuracy of the lower limit of porosity determined by the effective cores and invalid cores.

[0108] 104. The computer device determines at least one first target core and at least one second target core from multiple target cores according to the minimum porosity and permeability accumulation parameter, wherein the first target core is a target core whose porosity and permeability accumulation parameter is not less than the minimum porosity and permeability accumulation parameter, and the second target core is a target core whose porosity and permeability accumulation parameter is less than the minimum porosity and permeability accumulation parameter.

[0109] The porosity parameter of the target core is the product of the pore parameter and the permeability parameter of the target core.

[0110] In a possible implementation, the step of the computer device determining at least one first target core and at least one second target core from multiple target cores according to the minimum porosity and permeability parameter is as follows: the computer device determines at least one first target core whose porosity and permeability parameter is not less than the minimum porosity and permeability parameter from multiple target cores, and determines at least one second target core whose porosity and permeability parameter is less than the minimum porosity and permeability parameter from multiple target cores.

[0111] One point that needs to be explained is that when the porosity and permeability parameter of the target core is not less than the minimum porosity and permeability parameter, the target core is determined to be a valid core; when the porosity and permeability parameter of the target core is less than the minimum porosity and permeability parameter, the target core is determined to be an invalid core; that is, the first target core is a valid core, and the second target core is an invalid core.

[0112] 105. The computer device determines the reserves of each first target core and the reserves of each second target core, and determines threshold information of the pore parameters of the oil and gas layer based on the reserves of each first target core and the reserves of each second target core.

[0113] Optionally, the threshold information of the pore parameter is a limit value of the porosity, for example, the threshold information of the pore parameter is a lower limit value of the pore parameter. Optionally, the reserves in the embodiment of the present application are oil and gas reserves.

[0114] In a possible implementation, the step of determining the reserves of each first target core and each second target core by a computer device is as follows: the computer device determines, for each first target core, the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter, and pore parameter of the first target core; and according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter, and pore parameter of the first target core, determines the reserves of the first target core by using the following formula 3, thereby obtaining the reserves of at least one first target core;

[0115] Formula 3:

[0116] as well as,

[0117] For each second target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core; determine the reserves of the second target core by the following formula 4 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, and obtain the reserves of at least one second target core;

[0118] Formula 4:

[0119] Among them, A 1 represents the oil and gas area of ​​the first target core, h 1 represents the effective reservoir thickness of the first target core, B 1 represents the volume coefficient of the first target core, represents the pore parameters of the first target core, represents the reserves of the first target core, S w1 represents the irreducible water saturation parameter of the first target core, A 2 represents the oil and gas area of ​​the second target core, h 2 represents the effective reservoir thickness of the second target core, B 2 represents the volume coefficient of the second target core, represents the pore parameters of the second target core, represents the reserves of the second target core, S w2 Represents the irreducible water saturation parameter of the second target core.

[0120] In a possible implementation, the ratio between the product of the oil and gas area and the effective reservoir thickness and the volume coefficient can be expressed as k'. Accordingly, Formula 3 can be converted to: Among them, k' 1 =0.01A 1 h 1 / B 1 . Formula 4 can be converted to: Among them, k' 2 =0.01A 2 h 2 / B 2 . Optional, k' 1 The value of can be 0.01, k' 2 The value can be 0.01.

[0121] It should be noted that the computer device can obtain the irreducible water saturation parameter of the first target core according to the pore parameters of the first target core through the above formula 2. That is, Among them, S w1 represents the irreducible water saturation parameter of the first target core, represents the pore parameter of the first target core, c represents the third parameter, and d represents the fourth parameter.

[0122] The computer device can obtain the irreducible water saturation parameter of the second target core according to the pore parameters of the second target core through the above formula 2. That is, Among them, S w2 represents the irreducible water saturation parameter of the second target core, represents the pore parameter of the second target core, c represents the third parameter, and d represents the fourth parameter.

[0123] In a possible implementation, the steps for a computer device to determine the threshold information of the pore parameters of the oil and gas layer based on the reserves of each first target core and the reserves of each second target core are as follows: the computer device sorts at least one first target core according to the pore parameter from small to large according to the first pore parameter of each first target core, and determines a first total reserve, which is the sum of the reserves of the first target cores whose pore parameters are less than a preset parameter; sorts at least one second target core according to the pore parameter from large to small according to the pore parameter of each second target core, and determines a second total reserve, which is the sum of the reserves of the second target cores whose pore parameters are not less than the preset parameter; determines the target preset parameter corresponding to the first total reserve and the second total reserve when the first total reserve and the second total reserve are the same, and determines that the target preset parameter is the threshold information of the pore parameters of the oil and gas layer.

[0124] Figure 2 FIG. 1 is a schematic diagram showing a principle for determining threshold information of a pore parameter according to an exemplary embodiment. Figure 2 , where the abscissa is the pore parameter, the ordinate is the permeability parameter, the lower limit of porosity is the dotted line in the figure, the minimum porosity and permeability parameter is a curve in the figure, the samples on the upper side of the curve are effective cores not less than the minimum porosity and permeability parameter, and the samples on the lower side of the curve are invalid cores less than the minimum porosity and permeability parameter. The real reserves of the oil and gas layer are the oil and gas stored in the effective cores, that is, the sum of the oil and gas stored in the samples represented by the equilateral triangle and circle in the figure. However, when determining the lower limit of porosity, all samples not less than the lower limit of porosity, including invalid core samples and valid core samples, will be counted in the total oil and gas reserves, that is, the sum of the oil and gas stored in the samples represented by the diamond and circle on the right side of the straight line in the figure. When the lower limit of porosity makes the sum of the reserves of the samples represented by the equilateral triangle in area 1 and the diamond in area 2 equal, the oil and gas reserves of the invalid cores included in the total oil and gas reserves can be offset by the oil and gas reserves of the effective cores not included in the total oil and gas reserves, so that the determined total oil and gas reserves are closer to the true value.

[0125] It should be noted that the first target core is a valid core, the second target core is an invalid core, and the oil and gas reserves of the oil and gas layer are the total oil and gas reserves of all valid cores, that is, the total oil and gas reserves of the effective thickness section. However, when determining the lower limit of porosity, the oil and gas reserves of the valid cores that are less than the lower limit of porosity will not be counted in the total oil and gas reserves. Therefore, in the embodiment of the present application, the computer device determines that the corresponding porosity when the oil and gas stored in the valid core is the same as the oil and gas stored in the invalid core is used as the lower limit of porosity, so that the oil and gas reserves of the invalid core included in the total oil and gas reserves and the oil and gas reserves of the valid core not included in the total oil and gas reserves can offset each other, so that the determined total oil and gas reserves are closer to the true value.

[0126] The embodiment of the present application provides a method for determining threshold information of pore parameters. On the one hand, effective cores whose pore accumulation parameters are not less than the minimum pore accumulation parameter and invalid cores whose pore accumulation parameters are less than the minimum pore accumulation parameter are determined from multiple cores in the oil and gas layer through the minimum pore accumulation parameter of the oil and gas layer, and the minimum pore accumulation parameter of the oil and gas layer is determined through the two dimensions of porosity and permeability of the oil and gas layer, so the accuracy of determining effective cores and invalid cores is improved; on the other hand, in the process of determining the threshold information of the pore parameters of the oil and gas layer through the oil and gas reserves of the effective cores and the oil and gas reserves of the invalid cores, the contribution and influence of the oil and gas reserves of the invalid cores on the oil and gas reserves of the oil and gas layer are taken into account, and the porosity corresponding to the oil and gas reserves of the effective cores when the reserves are the same as the oil and gas reserves of the invalid cores is determined as the lower limit of the porosity, which can make the oil and gas reserves of the invalid cores included in the effective thickness section and the oil and gas reserves of the effective cores not included in the effective thickness section offset each other, so that the determined oil and gas reserves of the effective thickness section are closer to the true value. It can be seen from this that the embodiment of the present application can not only accurately determine the effective cores and invalid cores in the oil and gas layer from the two dimensions of porosity and permeability, but also comprehensively consider the contribution and influence of the reserves of effective cores and invalid cores on the oil and gas reserves of the oil and gas layer. Therefore, the threshold information of the determined pore parameters is closer to the actual lower limit of the porosity of the oil and gas layer, thereby improving the accuracy of the threshold information of the determined pore parameters.

[0127] The following is an example of a porous carbonate reservoir containing fractures to illustrate the method for determining the threshold information of the pore parameters in the present application.

[0128] Step 1: The computer equipment selected 15 sample cores and 1371 test cores from the carbonate reservoir.

[0129] Step 2: The computer device determines the pore parameters, permeability parameters and irreducible water saturation parameters of each sample core.

[0130] Step 3: The computer equipment determines the minimum porosity and permeability parameters of the carbonate reservoir according to the pore parameters and permeability parameters of the sample core.

[0131] S31. The computer equipment determines the relationship between the production and the pore and permeability parameters through the pore parameters and permeability parameters of the 15 sample cores: Among them, q represents the output, represents the porosity parameter, 25.56 represents the first parameter, and 0.7703 represents the second parameter.

[0132] S32. The computer device determines that the standard production of the carbonate reservoir is 20,000 cubic meters per day according to the depth of the carbonate reservoir. The minimum porosity parameter of carbonate reservoir is determined as

[0133] Step 4: The computer device determines multiple target cores from multiple test cores based on the pore parameters and irreducible water saturation parameters of the sample cores.

[0134] S41. The computer device determines the second relationship data between the pore parameters and the irreducible water saturation parameters according to the pore parameters and irreducible water saturation parameters of the 15 sample cores: Among them, S w represents the bound water saturation parameter, represents the pore parameter, 111.58 represents the third parameter, and -1.16 represents the fourth parameter.

[0135] When the computer equipment determines that the bound water saturation parameter is 100%, the minimum pore parameter of the oil and gas layer is:

[0136] S42. The computer device selects 868 target cores having pore parameters not less than 1.099% from the 1371 test cores of the carbonate reservoir.

[0137] Step 5: The computer equipment determines that 526 valid cores (first target cores) have a porosity accumulation parameter of not less than 0.037 from the 868 target cores, and determines that 342 invalid cores (first target cores) have a porosity accumulation parameter less than 0.037, based on the minimum porosity accumulation parameter of 0.037. The test results of the porosity accumulation parameters of the 868 target cores are shown in Table 1 below.

[0138] Table 1 Test results of porosity parameters of target cores

[0139]

[0140]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147]

[0148]

[0149] Step 6: The computer device determines the reserves of at least one effective core and the reserves of at least one invalid core, and determines the lower limit of the porosity of the carbonate reservoir based on the reserves of the at least one effective core and the reserves of the at least one invalid core.

[0150] S61, see Figure 3 The computer equipment sorts the 526 effective cores according to the first pore parameter of each effective core from small to large according to the pore parameter, and determines the first total reserve curve of the sorted multiple effective cores, as shown by curve 1 in the figure.

[0151] Among them, after sorting the 526 effective cores from small to large according to the pore parameters, the reserves of each effective core and the accumulated first total reserves are determined as shown in Table 2 below.

[0152] Table 2 Reserves of each effective core and the first total accumulated reserves

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159] S62, continue to see Figure 3The computer equipment sorts the 342 invalid cores from large to small according to the second pore parameter of each invalid core, and determines the second total reserve curve of the sorted multiple invalid cores, as shown in curve 2 in the figure.

[0160] Among them, after sorting the 342 invalid cores from large to small according to the pore parameters, the reserves of each invalid core and the accumulated second total reserves are determined as shown in Table 3 below.

[0161] Table 3 Reserves of each invalid core and the accumulated second total reserves

[0162]

[0163]

[0164]

[0165]

[0166] S63, continue to see Figure 3 The computer device determines the target preset parameters corresponding to the first total reserves and the second total reserves being the same, that is, the porosity corresponding to the intersection of curve 1 and curve 2 in the figure, and determines that the porosity is the lower limit of the porosity of the carbonate reservoir.

[0167] The embodiment of the present application provides a method for determining threshold information of pore parameters. On the one hand, effective cores whose pore accumulation parameters are not less than the minimum pore accumulation parameter and invalid cores whose pore accumulation parameters are less than the minimum pore accumulation parameter are determined from multiple cores in the oil and gas layer through the minimum pore accumulation parameter of the oil and gas layer, and the minimum pore accumulation parameter of the oil and gas layer is determined through the two dimensions of porosity and permeability of the oil and gas layer, so the accuracy of determining effective cores and invalid cores is improved; on the other hand, in the process of determining the threshold information of the pore parameters of the oil and gas layer through the oil and gas reserves of the effective cores and the oil and gas reserves of the invalid cores, the contribution and influence of the oil and gas reserves of the invalid cores on the oil and gas layer are taken into account, and the porosity corresponding to the oil and gas reserves of the effective cores when the reserves are the same as the oil and gas reserves of the invalid cores is determined as the lower limit of the porosity, which can make the oil and gas reserves of the invalid cores included in the effective thickness section and the oil and gas reserves of the effective cores not included in the effective thickness section offset each other, so that the determined oil and gas reserves of the effective thickness section are closer to the true value. It can be seen from this that the embodiment of the present application can not only accurately determine the effective cores and invalid cores in the oil and gas layer from the two dimensions of porosity and permeability, but also comprehensively consider the contribution of the reserves of effective cores and invalid cores to the oil and gas reserves of the oil and gas layer. Therefore, the threshold information of the determined pore parameters is closer to the actual lower limit of the porosity of the oil and gas layer, thereby improving the accuracy of the threshold information of the determined pore parameters.

[0168] Figure 4 is a block diagram of a device for determining threshold information of a pore parameter according to an exemplary embodiment. Figure 4 , the device comprises:

[0169] A first determination module 401 is used to determine a plurality of first sample cores, a plurality of second sample cores, and a plurality of test cores in the oil and gas layer to be tested;

[0170] A second determination module 402 is used to determine the pore parameters, permeability parameters and production parameters of each first sample core, and, for each second sample core, determine the pore parameters, permeability parameters and irreducible water saturation parameters of the second sample core;

[0171] The third determination module 403 is used to determine the minimum porosity and permeability parameters of the oil and gas layer according to the pore parameters, permeability parameters and production parameters of the first sample core, and to determine multiple target cores from multiple test cores according to the pore parameters and irreducible water saturation parameters of the second sample core;

[0172] The fourth determination module 404 is used to determine at least one first target core and at least one second target core from the multiple target cores according to the minimum porosity and permeability parameter, the first target core is a target core whose porosity and permeability parameter is not less than the minimum porosity and permeability parameter, and the second target core is a target core whose porosity and permeability parameter is less than the minimum porosity and permeability parameter;

[0173] The fifth determination module 405 is used to determine the reserves of at least one first target core and the reserves of at least one second target core, and determine the threshold information of the pore parameters of the oil and gas layer based on the reserves of at least one first target core and the reserves of at least one second target core.

[0174] In a possible implementation, the third determination module 403 is used to determine the qualified production of the oil and gas layer and the porosity accumulation parameter of the first sample core, the porosity accumulation parameter of any first sample core being the product of the pore parameter and the permeability parameter of the first sample core; determining first relationship data based on the production parameter and the porosity accumulation parameter of the first sample core, the first relationship data being used to represent the relationship between the production parameter and the porosity accumulation parameter; determining the minimum porosity accumulation parameter of the oil and gas layer based on the first relationship data and the qualified production of the oil and gas layer.

[0175] In another possible implementation, the third determination module 403 is used to input the production parameter and the porosity and permeability parameter of the first core into the following formula 1, determine the first parameter and the second parameter in the formula 1, and obtain the first relationship data;

[0176] Formula 1:

[0177] Among them, q represents the production parameter, represents the porosity parameter, a represents the first parameter, and b represents the second parameter.

[0178] In another possible implementation, the third determination module 403 is used to determine the second relationship data between the pore parameter and the irreducible water saturation parameter based on the pore parameter and the irreducible water saturation parameter of the second sample core, the second relationship data being used to represent the negative correlation between the pore parameter and the irreducible water saturation parameter; determine the minimum pore parameter of the oil and gas layer based on the maximum irreducible water saturation parameter of the oil and gas layer and the second relationship data; determine the pore parameters of multiple test cores, and determine multiple target cores whose pore parameters are not less than the minimum pore parameter from the multiple test cores.

[0179] In another possible implementation, the third determination module 403 is used to input the pore parameter and irreducible water saturation parameter of the second sample core into the following formula 2, determine the third parameter and the fourth parameter in the formula 2, and obtain the second relationship data;

[0180] Formula 2:

[0181] Among them, S w represents the bound water saturation parameter, represents the pore parameter, c represents the third parameter, and d represents the fourth parameter.

[0182] In another possible implementation, the fifth determination module 405 is used to determine, for each first target core, the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter, and pore parameter of the first target core, and determine the reserves of the first target core by the following formula 3 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter, and pore parameter of the first target core, to obtain the reserves of the at least one first target core;

[0183] Formula 3:

[0184] as well as,

[0185] For each second target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core; determine the reserves of the second target core by the following formula 4 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, and obtain the reserves of at least one second target core;

[0186] Formula 4:

[0187] Among them, A 1 represents the oil and gas area of ​​the first target core, h1 represents the effective reservoir thickness of the first target core, B 1 represents the volume coefficient of the first target core, represents the pore parameters of the first target core, represents the reserves of the first target core, S w1 represents the irreducible water saturation parameter of the first target core, A 2 represents the oil and gas area of ​​the second target core, h 2 represents the effective reservoir thickness of the second target core, B 2 represents the volume coefficient of the second target core, represents the pore parameters of the second target core, represents the reserves of the second target core, S w2 Represents the irreducible water saturation parameter of the second target core.

[0188] In another possible implementation, the fifth determination module 405 is used to sort at least one first target core according to the pore parameter of each first target core from small to large, and determine the first total reserves of the sorted multiple first target cores, where the first total reserves are the sum of the reserves of the multiple first target cores whose pore parameters are less than the preset parameters; sort at least one second target core according to the pore parameter of each second target core from large to small, and determine the second total reserves of the sorted multiple second target cores, where the second total reserves are the sum of the reserves of the multiple second target cores whose pore parameters are not less than the preset parameters; determine the target preset parameters corresponding to the first total reserves and the second total reserves when the first total reserves are the same, and determine that the target preset parameters are threshold information of the pore parameters of the oil and gas layer.

[0189] The embodiment of the present application provides a device for determining threshold information of pore parameters. On the one hand, since effective cores whose pore accumulation parameters are not less than the minimum pore accumulation parameter and invalid cores whose pore accumulation parameters are less than the minimum pore accumulation parameter are determined from multiple cores in the oil and gas layer through the minimum pore accumulation parameter of the oil and gas layer, and the minimum pore accumulation parameter of the oil and gas layer is determined through the two dimensions of porosity and permeability of the oil and gas layer, the accuracy of determining effective cores and invalid cores is improved; on the other hand, in the process of determining the threshold information of the pore parameters of the oil and gas layer through the oil and gas reserves of the effective cores and the oil and gas reserves of the invalid cores, the contribution and influence of the oil and gas reserves of the invalid cores on the oil and gas layer are taken into account, and the porosity corresponding to the oil and gas reserves of the effective cores when the reserves are the same as the oil and gas reserves of the invalid cores is determined as the lower limit of the porosity, which can make the oil and gas reserves of the invalid cores included in the effective thickness section and the oil and gas reserves of the effective cores not included in the effective thickness section offset each other, so that the determined oil and gas reserves of the effective thickness section are closer to the true value. It can be seen from this that the embodiment of the present application can not only accurately determine the effective cores and invalid cores in the oil and gas layer from the two dimensions of porosity and permeability, but also comprehensively consider the contribution and influence of the reserves of effective cores and invalid cores on the oil and gas reserves of the oil and gas layer. Therefore, the threshold information of the determined pore parameters is closer to the actual lower limit of the porosity of the oil and gas layer, thereby improving the accuracy of the threshold information of the determined pore parameters.

[0190] Figure 5 The block diagram of a computer device 500 provided by an exemplary embodiment of the present invention is shown. The computer device 500 may be: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III), an MP4 player (Moving Picture Experts Group Audio Layer IV), a laptop computer or a desktop computer. The computer device 500 may also be called a user device, a portable computer, a laptop computer, a desktop computer or other names.

[0191] Typically, the computer device 500 includes a processor 501 and a memory 502 .

[0192] The processor 501 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 501 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 501 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 501 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 501 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0193] The memory 502 may include one or more computer-readable storage media, which may be non-transitory. The memory 502 may also include a high-speed random access memory and a non-volatile memory, such as one or more disk storage devices and flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 502 is used to store at least one instruction, which is used to be executed by the processor 501 to implement the method for determining the threshold information of the pore parameter provided in the method embodiment of the present application.

[0194] In some embodiments, the computer device 500 may also optionally include: a peripheral device interface 503 and at least one peripheral device. The processor 501, the memory 502 and the peripheral device interface 503 may be connected via a bus or a signal line. Each peripheral device may be connected to the peripheral device interface 503 via a bus, a signal line or a circuit board. Specifically, the peripheral device includes: at least one of a radio frequency circuit 504, a display screen 505, a camera 506, an audio circuit 507, a positioning component 508 and a power supply 509.

[0195] The peripheral device interface 503 may be used to connect at least one peripheral device related to I / O (Input / Output) to the processor 501 and the memory 502. In some embodiments, the processor 501, the memory 502, and the peripheral device interface 503 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 501, the memory 502, and the peripheral device interface 503 may be implemented on a separate chip or circuit board, which is not limited in this embodiment.

[0196] The radio frequency circuit 504 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit 504 communicates with communication networks and other communication devices through electromagnetic signals. The radio frequency circuit 504 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. Optionally, the radio frequency circuit 504 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, and the like. The radio frequency circuit 504 can communicate with other computer devices through at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to: a metropolitan area network, various generations of mobile communication networks (2G, 3G, 4G and 5G), a wireless local area network and / or a WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit 504 may also include circuits related to NFC (Near Field Communication), which is not limited in this application.

[0197] The display screen 505 is used to display the UI (User Interface). The UI may include graphics, text, icons, videos, and any combination thereof. When the display screen 505 is a touch display screen, the display screen 505 also has the ability to collect touch signals on the surface or above the surface of the display screen 505. The touch signal can be input to the processor 501 as a control signal for processing. At this time, the display screen 505 can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, the display screen 505 can be one, and the front panel of the computer device 500 is set; in other embodiments, the display screen 505 can be at least two, which are respectively set on different surfaces of the computer device 500 or are folded; in some other embodiments, the display screen 505 can be a flexible display screen, which is set on the curved surface or folded surface of the computer device 500. Even, the display screen 505 can also be set to a non-rectangular irregular shape, that is, a special-shaped screen. The display screen 505 can be made of materials such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode, organic light-emitting diode).

[0198] The camera assembly 506 is used to capture images or videos. Optionally, the camera assembly 506 includes a front camera and a rear camera. Typically, the front camera is set on the front panel of the computer device, and the rear camera is set on the back of the computer device. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth of field camera, a wide-angle camera, and a telephoto camera, so as to realize the fusion of the main camera and the depth of field camera to realize the background blur function, the fusion of the main camera and the wide-angle camera to realize panoramic shooting and VR (Virtual Reality) shooting function or other fusion shooting functions. In some embodiments, the camera assembly 506 may also include a flash. The flash can be a monochrome temperature flash or a dual-color temperature flash. A dual-color temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation at different color temperatures.

[0199] The audio circuit 507 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, and convert the sound waves into electrical signals and input them into the processor 501 for processing, or input them into the radio frequency circuit 504 to achieve voice communication. For the purpose of stereo acquisition or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the computer device 500. The microphone may also be an array microphone or an omnidirectional acquisition microphone. The speaker is used to convert the electrical signal from the processor 501 or the radio frequency circuit 504 into sound waves. The speaker may be a traditional film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for purposes such as ranging. In some embodiments, the audio circuit 507 may also include a headphone jack.

[0200] Positioning component 508 is used to locate the current geographic location of computer device 500 to implement navigation or LBS (Location Based Service). Positioning component 508 can be a positioning component based on the US GPS (Global Positioning System), China's Beidou system, Russia's Grenas system or the European Union's Galileo system.

[0201] The power supply 509 is used to power various components in the computer device 500. The power supply 509 can be an alternating current, a direct current, a disposable battery, or a rechargeable battery. When the power supply 509 includes a rechargeable battery, the rechargeable battery can support wired charging or wireless charging. The rechargeable battery can also be used to support fast charging technology.

[0202] In some embodiments, the computer device 500 further includes one or more sensors 510 , including but not limited to: an acceleration sensor 511 , a gyroscope sensor 512 , a pressure sensor 513 , a fingerprint sensor 514 , an optical sensor 515 , and a proximity sensor 516 .

[0203] The acceleration sensor 511 can detect the magnitude of acceleration on the three coordinate axes of the coordinate system established by the computer device 500. For example, the acceleration sensor 511 can be used to detect the components of gravity acceleration on the three coordinate axes. The processor 501 can control the display screen 505 to display the user interface in a horizontal view or a vertical view according to the gravity acceleration signal collected by the acceleration sensor 511. The acceleration sensor 511 can also be used for collecting game or user motion data.

[0204] The gyro sensor 512 can detect the body direction and rotation angle of the computer device 500, and the gyro sensor 512 can cooperate with the acceleration sensor 511 to collect the user's 3D actions on the computer device 500. The processor 501 can implement the following functions based on the data collected by the gyro sensor 512: motion sensing (such as changing the UI according to the user's tilt operation), image stabilization during shooting, game control, and inertial navigation.

[0205] The pressure sensor 513 can be set on the side frame of the computer device 500 and / or the lower layer of the display screen 505. When the pressure sensor 513 is set on the side frame of the computer device 500, it can detect the user's grip signal of the computer device 500, and the processor 501 performs left and right hand recognition or shortcut operation according to the grip signal collected by the pressure sensor 513. When the pressure sensor 513 is set on the lower layer of the display screen 505, the processor 501 controls the operability controls on the UI interface according to the user's pressure operation on the display screen 505. The operability controls include at least one of a button control, a scroll bar control, an icon control, and a menu control.

[0206] The fingerprint sensor 514 is used to collect the user's fingerprint, and the processor 501 identifies the user's identity based on the fingerprint collected by the fingerprint sensor 514, or the fingerprint sensor 514 identifies the user's identity based on the collected fingerprint. When the user's identity is identified as a trusted identity, the processor 501 authorizes the user to perform relevant sensitive operations, which include unlocking the screen, viewing encrypted information, downloading software, paying, and changing settings. The fingerprint sensor 514 can be set on the front, back, or side of the computer device 500. When a physical button or a manufacturer logo is set on the computer device 500, the fingerprint sensor 514 can be integrated with the physical button or the manufacturer logo.

[0207] The optical sensor 515 is used to collect the ambient light intensity. In one embodiment, the processor 501 can control the display brightness of the display screen 505 according to the ambient light intensity collected by the optical sensor 515. Specifically, when the ambient light intensity is high, the display brightness of the display screen 505 is increased; when the ambient light intensity is low, the display brightness of the display screen 505 is reduced. In another embodiment, the processor 501 can also dynamically adjust the shooting parameters of the camera component 506 according to the ambient light intensity collected by the optical sensor 515.

[0208] The proximity sensor 516, also called a distance sensor, is usually disposed on the front panel of the computer device 500. The proximity sensor 516 is used to collect the distance between the user and the front of the computer device 500. In one embodiment, when the proximity sensor 516 detects that the distance between the user and the front of the computer device 500 is gradually decreasing, the processor 501 controls the display screen 505 to switch from the screen-on state to the screen-off state; when the proximity sensor 516 detects that the distance between the user and the front of the computer device 500 is gradually increasing, the processor 501 controls the display screen 505 to switch from the screen-off state to the screen-on state.

[0209] Those skilled in the art will understand that Figure 5 The structure shown in the figure does not constitute a limitation on the computer device 500, and the computer device 500 may include more or less components than those shown in the figure, or combine some components, or adopt a different arrangement of components.

[0210] In an exemplary embodiment, a storage medium including a program code is also provided, such as a memory including the program code, and the program code can be executed by a processor of the device to complete the above method. Optionally, the storage medium can be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium can be a ROM (Read-Only Memory), a RAM (Random Access Memory), a CD-ROM (Compact Disc Read-Only Memory), a magnetic tape, a floppy disk, an optical data storage device, etc.

[0211] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0212] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining threshold information of pore parameters, characterized in that: The method comprises: determining a plurality of first sample cores, a plurality of second sample cores, and a plurality of test cores within the oil and gas layer to be tested; For each first sample core, determine the pore parameters, permeability parameters and production parameters of the first sample core, and, for each second sample core, determine the pore parameters and irreducible water saturation parameters of the second sample core; Determine the qualified production of the oil and gas layer and the porosity and permeability parameters of the first sample core, wherein the porosity and permeability parameters of any first sample core are the product of the pore parameter and the permeability parameter of the first sample core; Inputting the production parameter and the porosity and permeability parameter of the first sample core into the following formula 1, determining the first parameter and the second parameter in the formula 1, and obtaining first relationship data, wherein the first relationship data is used to represent the relationship between the production parameter and the porosity and permeability parameter; Formula 1: ; Wherein, q represents the yield parameter, represents the porosity parameter, represents the first parameter, and b represents the second parameter; Determining a minimum porosity parameter of the oil and gas layer according to the first relationship data and the qualified production of the oil and gas layer; Input the pore parameters and irreducible water saturation parameters of the second sample core into the following formula 2, determine the third parameter and the fourth parameter in the formula 2, and obtain second relationship data, wherein the second relationship data is used to represent the negative correlation relationship between the pore parameters and the irreducible water saturation parameter; Formula 2: ; in, represents the irreducible water saturation parameter, represents the pore parameter, c represents the third parameter, and d represents the fourth parameter; determining a minimum pore parameter of the oil and gas layer according to a maximum irreducible water saturation parameter of the oil and gas layer and the second relationship data; Determining pore parameters of the plurality of test cores, and determining a plurality of target cores having pore parameters not less than the minimum pore parameter from the plurality of test cores; According to the minimum porosity and permeability accumulation parameter, at least one first target core and at least one second target core are determined from the multiple target cores, wherein the first target core is a target core whose porosity and permeability accumulation parameter is not less than the minimum porosity and permeability accumulation parameter, and the second target core is a target core whose porosity and permeability accumulation parameter is less than the minimum porosity and permeability accumulation parameter; For each first target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the first target core; and determine the reserves of the first target core by the following formula 3 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the first target core, to obtain the reserves of the at least one first target core; Formula 3: ; as well as, For each second target core, determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core; and determine the reserves of the second target core by the following formula 4 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, to obtain the reserves of the at least one second target core; Formula 4: ; in, represents the oil and gas-bearing area of ​​the first target core, represents the effective reservoir thickness of the first target core, represents the volume coefficient of the first target core, represents the pore parameters of the first target core, represents the reserves of the first target core, represents the irreducible water saturation parameter of the first target core, represents the oil and gas-bearing area of ​​the second target core, represents the effective reservoir thickness of the second target core, represents the volume coefficient of the second target core, represents the pore parameters of the second target core, represents the reserves of the second target core, represents the irreducible water saturation parameter of the second target core; According to the pore parameter of each first target core, the at least one first target core is sorted from small to large according to the pore parameter, and a first total reserve of the sorted plurality of first target cores is determined, wherein the first total reserve is the sum of the reserves of the plurality of first target cores whose pore parameters are less than a preset parameter; According to the pore parameter of each second target core, the at least one second target core is sorted from large to small according to the pore parameter, and a second total reserve of the sorted plurality of second target cores is determined, wherein the second total reserve is the sum of the reserves of the plurality of second target cores whose pore parameters are not less than the preset parameter; Determine a target preset parameter corresponding to when the first total reserves and the second total reserves are the same, and determine that the target preset parameter is threshold information of a pore parameter of the oil and gas layer.

2. A device for determining threshold information of pore parameters, characterized in that: The device comprises: A first determination module, used to determine a plurality of first sample cores, a plurality of second sample cores, and a plurality of test cores in the oil and gas layer to be tested; A second determination module is used to determine, for each first sample core, the pore parameters, permeability parameters and production parameters of the first sample core, and, for each second sample core, determine the pore parameters and irreducible water saturation parameters of the second sample core; The third determination module is used to determine the qualified production of the oil and gas layer and the porosity accumulation parameter of the first sample core, and the porosity accumulation parameter of any first sample core is the product of the pore parameter and the permeability parameter of the first sample core; the production parameter and the porosity accumulation parameter of the first sample core are input into the following formula 1, and the first parameter and the second parameter in the formula 1 are determined to obtain the first relationship data, and the first relationship data is used to represent the relationship between the production parameter and the porosity accumulation parameter; Formula 1: ; Wherein, q represents the yield parameter, represents the porosity parameter, represents the first parameter, b represents the second parameter; according to the first relationship data and the qualified production of the oil and gas layer, the minimum porosity and permeability parameter of the oil and gas layer is determined; the pore parameter and the irreducible water saturation parameter of the second sample core are input into the following formula 2 to determine the third parameter and the fourth parameter in the formula 2 to obtain the second relationship data, and the second relationship data is used to represent the negative correlation between the pore parameter and the irreducible water saturation parameter; Formula 2: ;in, represents the irreducible water saturation parameter, represents the pore parameter, c represents the third parameter, and d represents the fourth parameter; determining the minimum pore parameter of the oil and gas layer according to the maximum bound water saturation parameter of the oil and gas layer and the second relationship data; determining the pore parameters of the multiple test cores, and determining multiple target cores whose pore parameters are not less than the minimum pore parameter from the multiple test cores; a fourth determination module, configured to determine at least one first target core and at least one second target core from the plurality of target cores according to the minimum porosity and permeability accumulation parameter, wherein the first target core is a target core having a porosity and permeability accumulation parameter not less than the minimum porosity and permeability accumulation parameter, and the second target core is a target core having a porosity and permeability accumulation parameter less than the minimum porosity and permeability accumulation parameter; The fifth determination module is used to determine the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of each first target core, and determine the reserves of the first target core according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the first target core by the following formula 3, so as to obtain the reserves of the at least one first target core; Formula 3: ; and, for each second target core, determining the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, and determining the reserves of the second target core by the following formula 4 according to the oil and gas bearing area, effective reservoir thickness, volume coefficient, irreducible water saturation parameter and pore parameter of the second target core, to obtain the reserves of the at least one second target core; Formula 4: ;in, represents the oil and gas-bearing area of ​​the first target core, represents the effective reservoir thickness of the first target core, represents the volume coefficient of the first target core, represents the pore parameters of the first target core, represents the reserves of the first target core, represents the irreducible water saturation parameter of the first target core, represents the oil and gas-bearing area of ​​the second target core, represents the effective reservoir thickness of the second target core, represents the volume coefficient of the second target core, represents the pore parameters of the second target core, represents the reserves of the second target core, Indicates the bound water saturation parameter of the second target core; according to the pore parameter of each first target core, the at least one first target core is sorted from small to large according to the pore parameter, and a first total reserve of the sorted plurality of first target cores is determined, wherein the first total reserve is the sum of the reserves of the plurality of first target cores whose pore parameters are less than a preset parameter; according to the pore parameter of each second target core, the at least one second target core is sorted from large to small according to the pore parameter, and a second total reserve of the sorted plurality of second target cores is determined, wherein the second total reserve is the sum of the reserves of the plurality of second target cores whose pore parameters are not less than the preset parameter; determines a target preset parameter corresponding to the first total reserve and the second total reserve when the first total reserve and the second total reserve are the same, and determines that the target preset parameter is the threshold information of the pore parameter of the oil and gas layer.

3. A computer device, characterized in that: The computer device comprises: A processor and a memory, wherein at least one program code is stored in the memory, and the at least one program code is loaded and executed by the processor to implement the operations performed in the method for determining the threshold information of the pore parameter according to claim 1.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the at least one program code is loaded and executed by the processor to implement the operations performed in the method for determining threshold information of pore parameters as claimed in claim 1.

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