Unconventional oil and gas source reservoir coupling coefficient evaluation method, device, equipment and medium

Abstract

The embodiment of the invention discloses an evaluation method and device for an unconventional oil and gas source reservoir coupling coefficient, equipment and a medium. The method comprises the steps that the effective thickness and the total organic carbon value of a target hydrocarbon source rock stratum are calculated; calculating the porosity and permeability of the target reservoir stratum; according to the effective thickness, the total organic carbon value, the porosity, the permeability and the longitudinal shortest distance between the target hydrocarbon source rock stratum and the target reservoir stratum, determining a source reservoir coupling coefficient; the source reservoir coupling coefficient reflects the capacity of the target reservoir stratum for storing oil gas produced from the target hydrocarbon source rock stratum; and determining the formation testing productivity of the target reservoir stratum according to the size of the source reservoir coupling coefficient. According to the technical scheme, the aim of comprehensively and quantitatively analyzing the oil enrichment degree of the reservoir in the unconventional oil and gas system is achieved, the accuracy of a new well logging interpretation conclusion is improved, then invalid oil testing layers can be avoided during oil testing, and the oil testing success rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to an evaluation method, device, equipment and medium for unconventional oil and gas source-reservoir coupling coefficient. Background Art

[0002] With the continuous expansion and deepening of the field of oil and gas exploration and development, unconventional oil and gas has become one of the important resources for increasing reserves and production. Among them, unconventional oil and gas represented by shale oil is an important mineral resource. For interlayer shale oil, source rocks and reservoirs coexist in the shale formation. The two have obvious lithological differences and interfaces. The reservoir and source rock are in direct contact vertically or separated by a certain distance (generally within tens of meters). The oil and gas generated by the source rock are discharged outward and migrated to the reservoir with better physical properties to be enriched and accumulated.

[0003] At present, the logging evaluation of unconventional oil and gas usually focuses on the quality of source rocks and determines the corresponding oil and gas production evaluation results; or focuses on the quality of reservoirs and determines the corresponding oil and gas production evaluation results. The existing technical solutions can only reflect the impact of source rocks or reservoirs on oil and gas accumulation, and the final evaluation results are not accurate enough. Summary of the invention

[0004] The present invention provides an evaluation method, device, equipment and medium for unconventional oil and gas source-reservoir coupling coefficient, which can perform comprehensive quantitative analysis on source rocks and reservoirs, improve the accuracy of interpretation results when selecting layers for oil testing in new wells, and thus avoid invalid oil testing layers during oil testing, thereby improving the success rate of oil testing.

[0005] According to one aspect of the present invention, a method for evaluating the source-reservoir coupling coefficient of unconventional oil and gas is provided, the method comprising:

[0006] Calculate the effective thickness and total organic carbon value of the target source rock layer;

[0007] Calculate the porosity and permeability of the target reservoir;

[0008] Determine a source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability, and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store oil and gas produced from the target source rock layer;

[0009] The oil testing capacity of the target reservoir is determined according to the source-reservoir coupling coefficient.

[0010] According to another aspect of the present invention, there is provided an evaluation device for unconventional oil and gas source-reservoir coupling coefficient, comprising:

[0011] The effective thickness and total organic carbon value calculation module is used to calculate the effective thickness and total organic carbon value of the target source rock layer;

[0012] Porosity and permeability calculation module, used to calculate the porosity and permeability of the target reservoir;

[0013] A source-reservoir coupling coefficient determination module is used to determine the source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer;

[0014] The oil test capacity determination module is used to determine the oil test capacity of the target reservoir according to the source-reservoir coupling coefficient.

[0015] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0016] at least one processor; and

[0017] a memory communicatively connected to the at least one processor; wherein,

[0018] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the evaluation method of the unconventional oil and gas source-reservoir coupling coefficient described in any embodiment of the present invention.

[0019] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the evaluation method of the unconventional oil and gas source-reservoir coupling coefficient described in any embodiment of the present invention when executed.

[0020] The technical solution of the embodiment of the present application includes: calculating the effective thickness and total organic carbon value of the target source rock layer; calculating the porosity and permeability of the target reservoir layer; determining the source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer; and determining the oil testing capacity of the target reservoir layer according to the magnitude of the source-reservoir coupling coefficient. The source-reservoir coupling coefficient calculated by the present technical solution can reflect the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer, realizes the effect of comprehensive quantitative analysis of the source rock and the reservoir layer, improves the accuracy of the logging interpretation results when selecting layers for oil testing in new wells, and can avoid invalid oil testing layers during oil testing, thereby improving the success rate of oil testing.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a flow chart of an evaluation method of unconventional oil and gas source-reservoir coupling coefficient provided according to Example 1 of the present application;

[0024] Figure 2 It is a schematic diagram of a target source rock layer and a target reservoir layer provided according to Example 1 of the present application;

[0025] Figure 3 It is a flow chart of an evaluation method of unconventional oil and gas source-reservoir coupling coefficient provided in Example 2 of the present application;

[0026] Figure 4 This is a schematic diagram of a source-reservoir coupling coefficient threshold value provided according to Example 2 of the present application;

[0027] Figure 5 It is a structural schematic diagram of an evaluation device for unconventional oil and gas source-reservoir coupling coefficient provided according to Example 3 of the present application;

[0028] Figure 6 It is a structural schematic diagram of an electronic device for implementing an evaluation method of an unconventional oil and gas source-reservoir coupling coefficient according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", "target", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] Embodiment 1

[0032] Figure 1 A flowchart of an evaluation method for unconventional oil and gas source-reservoir coupling coefficient is provided for the first embodiment of the present application. The embodiment of the present application can be applied to the case of quantitative analysis of source rock layers and reservoir layers. The method can be performed by an evaluation device for unconventional oil and gas source-reservoir coupling coefficient. The evaluation device for unconventional oil and gas source-reservoir coupling coefficient can be implemented in the form of hardware and / or software. The evaluation device for unconventional oil and gas source-reservoir coupling coefficient can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0033] S110, calculating the effective thickness and total organic carbon value of the target source rock layer.

[0034] The target source rock layer may be one of the underground source rock segments, and the target source rock layer may be a source rock layer with a high oil and gas production, and the source rock layer has the ability to produce oil and gas. The effective thickness of the target source rock layer may be calculated after determining the top and bottom depths of the target source rock layer. The total organic carbon value of the target source rock layer may be determined based on the total organic carbon curve (TOC) of the target source rock layer, for example, by calculating the average value of the total organic carbon curve of the target source rock layer, and using the average value as the total organic carbon value.

[0035] S120, calculating the porosity and permeability of the target reservoir.

[0036] The target reservoir can be any one of the underground reservoirs, which has the ability to store oil and gas. It should be noted that the porosity and permeability of the target reservoir can be calculated based on well logging data, etc., and the specific calculation method is not limited in the embodiment of the present application.

[0037] It should be noted that unconventional oil and gas is also an important mineral resource. For the terrestrial shale oil in unconventional oil and gas, it is usually generated in source rocks and stored in reservoirs. For this reservoir, it is not enough to only consider the storage capacity of the reservoir. It is also necessary to consider the ability of the source rock to produce oil and gas and the difficulty of oil and gas reaching the reservoir from the source rock. The technical solution of the embodiment of the present application can quantitatively analyze the above-mentioned influencing factors and obtain the accurate test oil production capacity of the target reservoir.

[0038] For example, the target source rock layer and the target reservoir layer can refer to Figure 2 , the reservoir in the figure is the target reservoir, and the source rock is the target source rock layer.

[0039] Specifically, after determining the target source rock layer and the target reservoir layer in each underground layer segment, the shortest vertical distance between the target source rock layer and the target reservoir layer is calculated, which can be calculated based on the bottom depth of the layer segment located above and the top depth of the layer segment located below in the two layers.

[0040] S130, determining a source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability, and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store oil and gas produced from the target source rock layer.

[0041] Among them, the shortest vertical distance refers to the shortest vertical distance between the target source rock layer and the target reservoir layer. The shortest vertical distance can reflect the difficulty of oil and gas reaching the target reservoir layer from the target source rock layer. For example, the larger the shortest vertical distance, the more difficult it is for oil and gas to reach the target reservoir layer from the target source rock layer; the smaller the shortest vertical distance, the easier it is for oil and gas to reach the target reservoir layer from the target source rock layer.

[0042] In the embodiment of the present application, since the shortest vertical distance reflects the difficulty of oil and gas reaching the target reservoir from the target source rock layer, the effective thickness and the total organic carbon value reflect the ability of the target source rock layer to produce oil and gas, and the porosity and permeability reflect the ability of the target reservoir layer to store oil and gas, the source-reservoir coupling coefficient can be calculated based on the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer.

[0043] S140, determining the oil testing capacity of the target reservoir according to the source-reservoir coupling coefficient.

[0044] Specifically, after obtaining the source-reservoir coupling coefficient, the oil and gas content of the target reservoir, whether it is suitable for exploitation, etc. can be judged according to the size of the source-reservoir coupling coefficient, and the test oil production capacity of the target reservoir can be determined.

[0045] For example, in one feasible solution, multiple source-reservoir coupling coefficient intervals are pre-calibrated, and after the source-reservoir coupling coefficient is obtained, the target interval to which the source-reservoir coupling coefficient belongs is determined, and according to the mining assessment level corresponding to the target interval, whether the target reservoir can be tested for oil and the production capacity of the oil test are determined, thereby effectively avoiding the problem of invalid oil testing. In another feasible solution, after the source-reservoir coupling coefficients corresponding to multiple reservoirs are obtained, part of the source-reservoir coupling coefficients are determined in each source-reservoir coupling coefficient, and the reservoir corresponding to the part of the source-reservoir coupling coefficient has a higher success rate of oil testing than the reservoir corresponding to other source-reservoir coupling coefficients.

[0046] The technical solution of the embodiment of the present application includes: calculating the effective thickness and total organic carbon value of the target source rock layer; calculating the porosity and permeability of the target reservoir layer; determining the source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer; and determining the oil testing capacity of the target reservoir layer according to the magnitude of the source-reservoir coupling coefficient. The source-reservoir coupling coefficient calculated by the present technical solution can reflect the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer, realizes the effect of comprehensive quantitative analysis of the source rock and the reservoir layer, improves the accuracy of the logging interpretation results when selecting layers for oil testing in new wells, and can avoid invalid oil testing layers during oil testing, thereby improving the success rate of oil testing.

[0047] Embodiment 2

[0048] Figure 3 This is a flow chart of a method for evaluating the unconventional oil and gas source-reservoir coupling coefficient provided in Example 2 of the present application. The embodiment of the present application is optimized based on the above embodiment.

[0049] like Figure 3 As shown, the method of the embodiment of the present application specifically includes the following steps:

[0050] S210, calculating the effective thickness and total organic carbon value of the target source rock layer.

[0051] In an embodiment of the present application, optionally, the process of determining the target source rock layer includes: obtaining a total organic carbon curve of a target layer segment in a target area; determining a quality grade of the target layer segment based on the total organic carbon curve, and determining the target layer segment that meets the quality grade condition as the target source rock layer; or, determining the target layer segment whose total organic carbon curve and distribution of the target layer segment meet preset requirements as the target source rock layer.

[0052] The target layer segment may be a layer segment pre-selected by the staff. The target layer segment that meets the quality level condition may be a target layer segment that reaches a good level or above. The preset requirements may be determined according to actual conditions. For example, in order to make the target source rock layer a concentrated source rock layer, the preset requirements may be set as the source rock layer thickness is greater than the thickness threshold, and the total organic carbon value is greater than the preset threshold.

[0053] Specifically, the quality of source rocks in the target layer segments can be classified based on the total organic carbon curve with reference to relevant standards, and the target layer segments that have reached a good level or above can be determined as target source rock layers.

[0054] In an embodiment of the present application, the process of determining the target source rock layer can be: obtaining core geochemical experimental analysis data of the target area, constructing a source rock quality parameter calculation model based on logging data, calculating the total organic carbon (TOC) curve of the target layer segment, and identifying and dividing the main source rock layer segment as the target source rock layer according to relevant standards.

[0055] The identification and classification of the main source rock layers according to relevant standards refers to: classifying according to the total organic carbon value, and determining the source rock layers with a total organic carbon value reaching a certain level and relatively concentrated distribution as the main source rock layers.

[0056] The total organic carbon value is determined based on the total organic carbon curve. For example, the total organic carbon curve of a certain layer section is averaged to obtain the total organic carbon value of the layer section; or, based on the total organic carbon curve, a characteristic value is selected by the staff as the total organic carbon value.

[0057] The above TOC calculation should be based on the regional core analysis data scale, and the ΔLogR classic formula or empirical model introduced in the relevant literature should be selected based on the logging data to calculate the TOC content curve. The selection of the specific model needs to be determined according to the richness of the logging curve.

[0058] When performing TOC calculations, the calculation models of different wells in an oil field or a well area should be unified to ensure that the results between different wells are comparable.

[0059] S220, calculating the porosity and permeability of the target reservoir.

[0060] In an embodiment of the present application, optionally, calculating the porosity and permeability of the target reservoir includes: obtaining core physical property experimental analysis data of the target reservoir, calculating a first average value of the porosity and a first average value of the permeability based on the core physical property experimental analysis data, and determining the first average value of the porosity and the first average value of the permeability as the porosity and permeability of the target reservoir, respectively; or, obtaining a well logging calculated porosity curve and a well logging calculated permeability curve of the target reservoir, calculating a second average value of the porosity and a second average value of the permeability based on the well logging calculated porosity curve and the well logging calculated permeability curve, and determining the second average value of the porosity and the second average value of the permeability as the porosity and permeability of the target reservoir, respectively.

[0061] It should be noted that since the reservoirs in the unconventional oil and gas development section usually show extremely low porosity and permeability and strong heterogeneity, the reservoir porosity and permeability calculation model needs to be calibrated in combination with the regional core analysis data and the results after overburden pressure correction to the underground state.

[0062] Optionally, when calculating the permeability and porosity of the target reservoir, nuclear magnetic resonance logging (NMR) data may be used to calculate the porosity and permeability, which has higher accuracy than the empirical formula method of conventional logging curves.

[0063] S230: Determine a pore structure index according to the porosity and permeability of the target reservoir.

[0064] Specifically, the pore structure index is determined by the following formula:

[0065]

[0066] Where, K is the permeability of the target reservoir, is the porosity of the target reservoir.

[0067] S240, determining a forward parameter according to the product of the pore structure index, the effective thickness and the total organic carbon value.

[0068] In an embodiment of the present application, optionally, the process of determining the shortest longitudinal distance between the target source rock layer and the target reservoir layer includes: if the target source rock layer is located above the target reservoir layer, then the longitudinal distance between the bottom of the target source rock layer and the top of the target reservoir layer is determined as the shortest longitudinal distance; otherwise, the longitudinal distance between the top of the target source rock layer and the bottom of the target reservoir layer is determined as the shortest longitudinal distance.

[0069] In the embodiments of the present application, regarding the effective thickness of the target source rock layer, and the process of determining the shortest longitudinal distance between the target source rock layer and the target reservoir layer, it is necessary to determine the top and bottom depths of the target source rock layer and the target reservoir layer; when determining the top and bottom depths of the target source rock layer, reference can be made to relevant industry standards or regional experience, and the relatively continuously distributed layer segments with a total organic carbon content higher than the lower limit of the industry standard can be identified, and their top and bottom depth positions can be determined based on the half-width point method of the logging curve.

[0070] The top and bottom depths mentioned are vertical depths, and vertical depth correction should be carried out for inclined wells.

[0071] The forward parameter is expressed by the following formula:

[0072]

[0073] in, is the pore structure index, V TOC is the total organic carbon value of the target source rock layer, HE S is the effective thickness of the target source rock layer.

[0074] S250, determining a source-reservoir coupling coefficient according to a ratio of the forward parameter to the shortest longitudinal distance.

[0075] The source-reservoir coupling coefficient is determined by the following formula:

[0076]

[0077] Where COUP is the source-reservoir coupling coefficient, DIS min is the shortest vertical distance.

[0078] S260, determining the oil testing capacity of the target reservoir according to the source-reservoir coupling coefficient.

[0079] In an embodiment of the present application, optionally, the test oil production capacity of the target reservoir is determined according to the size of the source-reservoir coupling coefficient, including: if the source-reservoir coupling coefficient is greater than a source-reservoir coupling coefficient threshold, determining that the daily oil production of the target reservoir reaches the industrial level.

[0080] The source-reservoir coupling coefficient threshold reflects the boundary between industrial oil flow intervals and non-industrial oil flow intervals, and can be determined in the manner described below.

[0081] Specifically, if the source-reservoir coupling coefficient is greater than the source-reservoir coupling coefficient threshold, it indicates that the corresponding target reservoir has an industrial production grade, i.e., an industrial oil flow layer section, and subsequent oil testing, production capacity assessment, oil and gas production and other operations can be carried out.

[0082] In the embodiment of the present application, optionally, the process of determining the source-reservoir coupling coefficient threshold includes steps A1-A3:

[0083] Step A1, calculating the source-reservoir coupling coefficient of the reservoir of the produced or tested oil wells in the same geological layer in the target area, and obtaining the oil and gas production of the reservoir of the produced or tested oil wells in the same geological layer.

[0084] Step A2, among the source-reservoir coupling coefficients of the reservoirs of the produced or tested oil wells in the same geological layer, the source-reservoir coupling coefficient whose corresponding oil and gas production meets the industrial-grade production capacity condition is determined as the first source-reservoir coupling coefficient.

[0085] Step A3: determining the minimum value of the first source-reservoir coupling coefficient as the source-reservoir coupling coefficient threshold.

[0086] In the embodiment of the present application, the reservoirs of the mined or tested wells, the target reservoirs, the target source rock layers, etc. of the same geological layer are all located in the target area. The oil and gas production meets the industrial-grade production capacity condition means that the oil and gas production reaches the industrial-grade production capacity.

[0087] Specifically, the oil and gas production data of the reservoir of the mined or tested wells in the same geological layer refers to the daily oil production or oil production index of the test layer section (reservoir), which can be determined by dividing the daily oil production of the test layer section by the effective thickness of the test layer section. If there is natural gas production, the daily gas production measured on the ground is divided by 1200 and added to the daily oil production to participate in the calculation as the oil and gas equivalent.

[0088] Specifically, the source-reservoir coupling coefficient of the reservoir of the mined or tested oil wells in the same geological layer in the target area is calculated, and the specific calculation method can be the same as the method of calculating the source-reservoir coupling coefficient corresponding to the target reservoir. Further, after obtaining the oil and gas production, the relevant standards can be referred to to determine the oil and gas production corresponding to the industrial-grade production capacity, and the source-reservoir coupling coefficient of the reservoir of the mined or tested oil wells in the same geological layer, the corresponding oil and gas production reaches the industrial-grade production capacity The source-reservoir coupling coefficient is determined as the first source-reservoir coupling coefficient. Obviously, the first source-reservoir coupling coefficient is the source-reservoir coupling coefficient corresponding to the industrial oil flow layer segment, and the minimum value among them is determined as the source-reservoir coupling coefficient threshold, which is the identification standard for obtaining the test oil layer of industrial oil flow in the target area.

[0089] In the embodiment of the present application, the target source rock layer and the target reservoir layer may be located in the wellbore to be tested. For the produced wellbore and the wellbore to be tested, their relevant parameters should be as similar as possible to reduce errors. For example, each wellbore has basically similar fracturing construction parameters in the target area.

[0090] For example, take an example of an interlayer shale oil well that has achieved industrial-grade production capacity. The shortest distance (vertical shortest distance) between the target reservoir and the target source rock layer is only 13.5m. According to several key parameters, the TOC of the target source rock layer in this example is as high as 18.4%, the thickness is 11.1m, the porosity of the upper target reservoir section is 9.5%, and the permeability is 0.45mD. The source-reservoir coupling coefficient COUP calculated based on the above parameters is 3.29, and the daily oil production of the test oil is 14.41 tons.

[0091] Taking another interlayer shale oil that has not obtained industrial oil flow as an example, the quality of the target source rock layer, the physical properties of the target reservoir and other indicators are close to those of the above-mentioned industrial-grade interlayer shale oil example. However, since the reservoir in the test layer is too far away from the source rock, the shortest distance between the two (the shortest vertical distance) is 67.4m, which seriously affects the degree of coupling between the two, resulting in unsatisfactory oil and gas accumulation in the reservoir, and the oil test only obtained an oil production of 0.1 tons / day.

[0092] Figure 4 The figure shows a cross plot of source-reservoir coupling coefficient and oil and gas production in a well area based on the calibration of 13 test well data. According to the dividing line of the data points of the industrial oil flow layer and the non-industrial oil flow layer in the figure, COUPmin (source-reservoir coupling coefficient threshold) can be determined to be 1.0. That is, for a new well or a new layer to be tested, if its source-reservoir coupling coefficient is greater than 1.0, it is possible to obtain industrial oil and gas flow under similar fracturing transformation measures.

[0093] The technical solution of the embodiment of the present application determines the source-reservoir coupling coefficient threshold corresponding to the industrial oil flow layer according to the source-reservoir coupling coefficient and the oil and gas production of the reservoir of the produced wellbore, and then determines whether the production grade of the target reservoir is industrial grade, that is, whether the target reservoir is an industrial oil flow layer, based on the size relationship between the source-reservoir coupling coefficient and the source-reservoir coupling coefficient threshold, thereby improving the accuracy of the evaluation results of oil and gas production of the relevant oil and gas reservoirs, thereby avoiding invalid test oil layers during oil testing and improving the success rate of oil testing.

[0094] Embodiment 3

[0095] Figure 5 This is a schematic diagram of the structure of an evaluation device for unconventional oil and gas source-reservoir coupling coefficient provided in Example 3 of the present application. The device can execute the evaluation method for unconventional oil and gas source-reservoir coupling coefficient provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. Figure 5 As shown, the device comprises:

[0096] An effective thickness and total organic carbon value calculation module 310 is used to calculate the effective thickness and total organic carbon value of the target source rock layer;

[0097] A porosity and permeability calculation module 320 is used to calculate the porosity and permeability of the target reservoir;

[0098] The source-reservoir coupling coefficient determination module 330 is used to determine the source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer;

[0099] The oil testing capacity determination module 340 is used to determine the oil testing capacity of the target reservoir according to the source-reservoir coupling coefficient.

[0100] The technical solution of the embodiment of the present application includes: an effective thickness and total organic carbon value calculation module 310, which is used to calculate the effective thickness and total organic carbon value of the target source rock layer; a porosity and permeability calculation module 320, which is used to calculate the porosity and permeability of the target reservoir; a source-reservoir coupling coefficient determination module 330, which is used to determine the source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer; and an oil test capacity determination module 340, which is used to determine the oil test capacity of the target reservoir layer according to the size of the source-reservoir coupling coefficient. The source-reservoir coupling coefficient calculated by the technical solution can reflect the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer, realize the effect of comprehensive quantitative analysis of the source rock and the reservoir layer, improve the accuracy of the logging interpretation results when selecting the layer for oil test in a new well, and thus avoid invalid oil test layers during oil test, and improve the success rate of oil test.

[0101] Optionally, the source-reservoir coupling coefficient determination module 330 includes:

[0102] A pore structure index determination unit, used to determine the pore structure index according to the porosity and permeability of the target reservoir;

[0103] A forward parameter determination unit, used to determine a forward parameter according to the product of the pore structure index, the effective thickness and the total organic carbon value;

[0104] The source-reservoir coupling coefficient determining unit is used to determine the source-reservoir coupling coefficient according to the ratio of the forward parameter to the shortest longitudinal distance.

[0105] Optionally, the oil testing capacity determination module 340 includes:

[0106] The oil test capacity determination unit is used to determine that the daily oil production of the target reservoir reaches the industrial level if the source-reservoir coupling coefficient is greater than a source-reservoir coupling coefficient threshold.

[0107] Optionally, the device further includes a source-reservoir coupling coefficient threshold determination module, specifically including:

[0108] A source-reservoir coupling coefficient calculation unit is used to calculate the source-reservoir coupling coefficient of the reservoir of the produced or tested oil wells in the same geological layer in the target area, and obtain the oil and gas production of the reservoir of the produced or tested oil wells in the same geological layer;

[0109] A first source-reservoir coupling coefficient determining unit is used to determine, among the source-reservoir coupling coefficients of the reservoirs of the produced or tested oil wells in the same geological layer, the source-reservoir coupling coefficients corresponding to the oil and gas production that meets the industrial-grade production capacity conditions as the first source-reservoir coupling coefficient;

[0110] The source-reservoir coupling coefficient threshold determination unit is used to determine the minimum value of the first source-reservoir coupling coefficient as the source-reservoir coupling coefficient threshold.

[0111] Optionally, the device further includes a target source rock layer determination module, specifically including:

[0112] A total organic carbon curve acquisition unit is used to acquire a total organic carbon curve of a target layer section in a target area;

[0113] a target source rock layer determination unit, used to determine the quality grade of the target layer segment based on the total organic carbon curve, and determine the target layer segment that meets the quality grade condition as the target source rock layer; or

[0114] The target layer whose total organic carbon curve and distribution of the target layer meet the preset requirements is determined as the target source rock layer.

[0115] Optionally, the device further includes a porosity and permeability calculation module for the target reservoir, specifically including:

[0116] A porosity and permeability calculation unit, used for obtaining core physical property experimental analysis data of a target reservoir, calculating a first average value of porosity and a first average value of permeability based on the core physical property experimental analysis data, and determining the first average value of porosity and the first average value of permeability as the porosity and permeability of the target reservoir respectively; or,

[0117] A porosity curve calculated by well logging and a permeability curve calculated by well logging of the target reservoir are obtained, a second average value of the porosity and a second average value of the permeability are calculated based on the porosity curve calculated by well logging and the permeability curve calculated by well logging, and the second average value of the porosity and the second average value of the permeability are determined as the porosity and permeability of the target reservoir, respectively.

[0118] Optionally, the device further includes a shortest longitudinal distance determination module, specifically including:

[0119] a longitudinal shortest distance determination unit, for determining the longitudinal distance between the bottom of the target source rock layer and the top of the target reservoir layer as the longitudinal shortest distance if the target source rock layer is located above the target reservoir layer;

[0120] Otherwise, the vertical distance between the top of the target source rock layer and the bottom of the target reservoir layer is determined as the shortest vertical distance.

[0121] An evaluation device for an unconventional oil and gas source-reservoir coupling coefficient provided in an embodiment of the present application can execute an evaluation method for an unconventional oil and gas source-reservoir coupling coefficient provided in any embodiment of the present application, and has functional modules and beneficial effects corresponding to the execution method.

[0122] Embodiment 4

[0123] Figure 6 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0124] like Figure 6 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0125] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0126] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the evaluation method of the unconventional oil and gas source-reservoir coupling coefficient.

[0127] In some embodiments, the evaluation method of the unconventional oil and gas source-reservoir coupling coefficient may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the evaluation method of the unconventional oil and gas source-reservoir coupling coefficient described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the evaluation method of the unconventional oil and gas source-reservoir coupling coefficient in any other appropriate manner (e.g., by means of firmware).

[0128] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0129] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0130] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0131] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0132] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0133] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0134] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0135] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for evaluating the coupling coefficient of unconventional oil and gas source and reservoir, characterized in that: include: Calculate the effective thickness and total organic carbon value of the target source rock layer; Calculate the porosity and permeability of the target reservoir; Determine a source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability, and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store oil and gas produced from the target source rock layer; The oil testing capacity of the target reservoir is determined according to the source-reservoir coupling coefficient.

2. The method according to claim 1, characterized in that According to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer, the source-reservoir coupling coefficient is determined, including: Determine the pore structure index based on the porosity and permeability of the target reservoir; Determining a forward parameter according to the product of the pore structure index, the effective thickness and the total organic carbon value; The source-reservoir coupling coefficient is determined according to the ratio of the forward parameter to the shortest longitudinal distance.

3. The method according to claim 1, characterized in that According to the source-reservoir coupling coefficient, the oil testing capacity of the target reservoir is determined, including: If the source-reservoir coupling coefficient is greater than the source-reservoir coupling coefficient threshold, it is determined that the daily oil production of the target reservoir reaches the industrial level.

4. The method according to claim 3, characterized in that The process of determining the source-reservoir coupling coefficient threshold includes: Calculate the source-reservoir coupling coefficient of the reservoirs of the developed or tested oil wells in the same geological layer in the target area, and obtain the oil and gas production of the reservoirs of the developed or tested oil wells in the same geological layer; Among the source-reservoir coupling coefficients of the reservoirs of the produced or tested wells in the same geological layer, the source-reservoir coupling coefficient whose corresponding oil and gas production meets the industrial-grade production capacity condition is determined as the first source-reservoir coupling coefficient; The minimum value among the first source-reservoir coupling coefficients is determined as the source-reservoir coupling coefficient threshold.

5. The method according to claim 1, characterized in that The process of determining the target source rock layer includes: Obtain the total organic carbon curve of the target layer in the target area; Based on the total organic carbon curve, determine the quality grade of the target layer segment, and determine the target layer segment that meets the quality grade condition as the target source rock layer; or, The target layer whose total organic carbon curve and distribution of the target layer meet the preset requirements is determined as the target source rock layer.

6. The method according to claim 1, characterized in that Calculate the porosity and permeability of the target reservoir, including: Acquire core physical property experimental analysis data of the target reservoir, calculate a first average value of porosity and a first average value of permeability based on the core physical property experimental analysis data, and determine the first average value of porosity and the first average value of permeability as the porosity and permeability of the target reservoir respectively; or, A porosity curve calculated by well logging and a permeability curve calculated by well logging of the target reservoir are obtained, a second average value of the porosity and a second average value of the permeability are calculated based on the porosity curve calculated by well logging and the permeability curve calculated by well logging, and the second average value of the porosity and the second average value of the permeability are determined as the porosity and permeability of the target reservoir, respectively.

7. The method according to claim 1, characterized in that The process of determining the shortest vertical distance between the target source rock layer and the target reservoir layer includes: If the target source rock layer is located above the target reservoir layer, the vertical distance between the bottom of the target source rock layer and the top of the target reservoir layer is determined as the shortest vertical distance; Otherwise, the vertical distance between the top of the target source rock layer and the bottom of the target reservoir layer is determined as the shortest vertical distance.

8. An evaluation device for unconventional oil and gas source-reservoir coupling coefficient, characterized in that: include: The effective thickness and total organic carbon value calculation module is used to calculate the effective thickness and total organic carbon value of the target source rock layer; Porosity and permeability calculation module, used to calculate the porosity and permeability of the target reservoir; A source-reservoir coupling coefficient determination module is used to determine the source-reservoir coupling coefficient according to the effective thickness, total organic carbon value, porosity, permeability and the shortest vertical distance between the target source rock layer and the target reservoir layer; the source-reservoir coupling coefficient reflects the ability of the target reservoir layer to store the oil and gas produced from the target source rock layer; The oil test capacity determination module is used to determine the oil test capacity of the target reservoir according to the source-reservoir coupling coefficient.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the evaluation method for the unconventional oil and gas source-reservoir coupling coefficient described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the evaluation method for the unconventional oil and gas source-reservoir coupling coefficient according to any one of claims 1 to 7 when executed.

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