A method, device, medium and equipment for calculating shale oil and gas resources

Abstract

The application discloses a method, device, medium and equipment for calculating shale oil and gas resources, and relates to the technical field of petroleum. The method comprises the following steps: obtaining a maturity range of shale oil and gas through a crude oil density and maturity scatter diagram of the shale oil and gas; dividing shale oil products to obtain shale oil product categories and draw an oil product plane distribution diagram; counting total organic carbon data and projecting the total organic carbon data to a research area range to draw a total organic carbon plane distribution diagram; superimposing the oil product plane distribution diagram and the total organic carbon plane distribution diagram and constructing a grid unit in the superimposed distribution diagram; calculating a recovery coefficient of total organic carbon corresponding to the grid unit of each oil product; selecting shale samples with different ranges of total organic carbon content to respectively perform a thermal simulation experiment under a closed system and a quartz tube thermal simulation experiment, obtaining a hydrocarbon production rate and calculating a hydrocarbon expulsion efficiency; and calculating shale oil and gas geological resources of each oil product through shale oil and gas data of the grid unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum, in particular to a method, device, medium and equipment for calculating shale oil and gas resource quantity. BACKGROUND

[0002] Shale oil and gas resource is oil and gas resource existing in shale layer, which is an important part of unconventional oil and gas resource. With the continuous growth of global energy demand and the gradual depletion of conventional oil and gas resource, the development of shale oil and gas has become an important direction in the energy field. Shale oil and gas resource has the characteristics of wide distribution and large reserves, but its exploitation is difficult and depends on advanced technologies such as horizontal drilling and hydraulic fracturing. In recent years, the success of shale gas revolution has promoted the global exploration and development boom of shale oil and gas. Therefore, calculating oil and gas resource quantity can effectively help the exploration and development of oil and gas.

[0003] In the prior art, oil and gas resource data is mainly obtained based on basin simulation technology, and then oil and gas resource quantity is calculated. However, since there are differences in the flowability of crude oil in the study area, and the existing technology does not distinguish the oil products of shale oil and gas, the oil and gas resource data obtained by the existing technology is directly used for calculating the oil and gas resource quantity in the study area, which further increases the error and further increases the calculation error of the resource quantity.

[0004] Therefore, there is an urgent need for a shale oil and gas resource quantity calculation method to solve the difference in the flowability of crude oil in the study area and improve the calculation accuracy of shale oil and gas resource quantity. SUMMARY

[0005] Therefore, it is necessary to provide a method, device, medium and equipment for calculating shale oil and gas resource quantity to improve the calculation accuracy of oil product resource quantity in view of the above technical problems.

[0006] The present application adopts the following technical solutions:

[0007] The present application provides a method for calculating shale oil and gas resource quantity, comprising:

[0008] The maturity of shale oil and gas is obtained, and shale oil products are divided according to the maturity range of shale oil and gas to determine the type of oil product of shale oil and gas, and an oil product plane distribution map is drawn. The shale oil and gas includes at least one shale oil product;

[0009] A total organic carbon plane distribution map is drawn according to the total organic carbon data of shale oil and gas. The oil product plane distribution map and the total organic carbon plane distribution map are superimposed, and a grid unit of each oil product is constructed in the superimposed distribution map;

[0010] recovering coefficient of total organic carbon corresponding to each grid cell is calculated; shale oil and gas with different ranges of total organic carbon content is selected from each grid cell according to organic matter abundance evaluation standard to perform thermal simulation experiment under closed system respectively, and hydrocarbon generation rate and hydrocarbon discharge efficiency corresponding to each grid cell are obtained;

[0011] Through total organic carbon content, total organic carbon recovering coefficient, hydrocarbon generation rate and hydrocarbon discharge efficiency of each grid cell, shale oil and gas geological resource quantity of each oil product is calculated.

[0012] Preferably, the recovering coefficient of total organic carbon corresponding to each grid cell is calculated, comprising:

[0013] For any grid cell, at least one typical well in each grid cell is selected, total organic carbon content loss curve is drawn through three history recovery, and the recovering coefficient of total organic carbon is obtained through the ratio of total organic carbon after loss to that before loss.

[0014] Preferably, the grid cell of each oil product is constructed in the distribution map after superposition, comprising:

[0015] The region with the same oil product and shale thickness interval is taken as a grid cell.

[0016] Preferably, there is at least one typical well in each grid cell, and each typical well comprises data of total organic carbon and maturity range of shale oil and gas.

[0017] Preferably, the shale oil and gas with different ranges of total organic carbon content comprises shale oil and gas with total organic carbon content of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0% and greater than 2.0%; and the thermal simulation experiment of shale oil and gas with different ranges of total organic carbon content selected from each grid cell respectively specifically comprises:

[0018] For any grid cell, product characteristics of shale with different ranges of total organic carbon content are determined according to shale oil and gas with total organic carbon content of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0% and greater than 2.0%, a scatter plot of maturity range of different shale oil and gas and oil production rate, gas production rate and hydrocarbon generation rate is established, and hydrocarbon generation rate corresponding to each grid cell is obtained;

[0019] A scatter plot of maturity range of different shale oil and gas and discharged oil amount, discharged gas amount and total hydrocarbon amount is established, discharged oil amount, discharged gas amount and total hydrocarbon amount of each grid cell are obtained, and hydrocarbon discharge efficiency corresponding to each grid cell is calculated according to discharged oil amount, discharged gas amount and total hydrocarbon amount of each grid cell, and the formula is:

[0020] ;

[0021] In the formula,P for the hydrocarbon discharge efficiency, for the oil discharge amount, for the gas discharge amount, for the total hydrocarbon amount.

[0022] Preferably, the shale oil and gas geological resource amount of each oil product is calculated by the total organic carbon content of each grid cell, the recovery coefficient of total organic carbon, the hydrocarbon production rate, and the hydrocarbon discharge efficiency, and the formula is:

[0023] ;

[0024] In the formula, Q is the shale oil and gas geological resource amount; S is the grid cell area; H is the effective hydrocarbon source rock thickness of the grid cell; C is the total organic carbon content of the grid cell; K is the recovery coefficient of total organic carbon; Xo is the hydrocarbon production rate; P is the hydrocarbon discharge efficiency; is the rock density.

[0025] The present application also provides a device for calculating the shale oil and gas resource amount, characterized in that it comprises:

[0026] an oil product division module for obtaining the maturity of shale oil and gas, and dividing shale oil products according to the maturity range of shale oil and gas to determine the oil product types of shale oil and gas;

[0027] an oil product grid construction module for drawing a total organic carbon plane distribution map, superimposing the oil product plane distribution map and the total organic carbon plane distribution map, and constructing a grid cell of each oil product in the superimposed distribution map;

[0028] an oil and gas resource amount calculation module for calculating the shale oil and gas geological resource amount of each oil product.

[0029] The present application also provides a computer readable storage medium, characterized in that the storage medium stores a computer program, and the computer program is executed by a processor to implement the method of any one of claims 1-6.

[0030] The present application also provides a computer device, characterized in that it comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the method of any one of claims 1-6.

[0031] The above at least one technical scheme adopted by the present application can achieve the following beneficial effects:

[0032] This invention provides a method for calculating shale oil and gas resources. It obtains the maturity range of shale oil and gas by using a scatter plot of crude oil density and maturity. Based on this maturity range, shale oil is classified into four types, and a planar distribution map of these oil types is drawn. The method considers the non-uniformity of the planar distribution of shale geochemical parameters and statistically analyzes total organic carbon data to classify the oil types. This classification is then projected onto the study area to obtain a planar distribution map of total organic carbon. Finally, the planar distribution map of oil types is compared with the planar distribution map of total organic carbon. Overlaying was performed, and grid cells for each oil product were constructed within the overlaid distribution map. The recovery coefficient of total organic carbon (TOC) for each oil product's grid cells was calculated. Based on the organic matter abundance evaluation criteria, shale samples with different ranges of TOC content were selected for closed-system thermal simulation experiments and quartz tube thermal simulation experiments to obtain the hydrocarbon production rate and hydrocarbon expulsion efficiency corresponding to each oil product's grid cells. The shale oil and gas geological resources of each oil product were calculated using the TOC content, TOC recovery coefficient, hydrocarbon production rate, and hydrocarbon expulsion efficiency of each oil product's grid cells.

[0033] This invention takes into account the strong heterogeneity of the planar distribution of shale geochemical parameters and the differences in crude oil fluidity among different oil products. It classifies shale oil and gas into different types of oil products and obtains data for calculating shale oil and gas resources by constructing grid cells for each type of oil product. This enables the calculation of shale oil and gas resources for different types of oil products, improves the accuracy of shale oil and gas resource calculation, and reduces calculation errors. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 A schematic flowchart of a method for calculating shale oil and gas resources provided by the present invention;

[0036] Figure 2 This invention provides a method for calculating shale oil and gas resources, including an overlay diagram of oil product distribution and total organic carbon.

[0037] Figure 3 The present invention provides a method for calculating shale oil and gas resources, including total organic carbon loss curves at different maturity levels;

[0038] Figure 4 This invention provides a thermal simulation experimental procedure for calculating shale oil and gas resources.

[0039] Figure 5The method for calculating shale oil and gas resource quantity provided by the application is a shale oil and gas resource quantity calculation method with varying hydrocarbon discharge efficiency curves under different maturities.

[0040] Figure 6 The device for calculating shale oil and gas resource quantity provided by the application is a shale oil and gas resource quantity calculation device with varying hydrocarbon discharge efficiency curves under different maturities.

[0041] Figure 7 The computer device for implementing the method for calculating shale oil and gas resource quantity provided by the application is a computer device for implementing the shale oil and gas resource quantity calculation method with varying hydrocarbon discharge efficiency curves under different maturities. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the application clearer, the technical solutions of the application will be described clearly and completely below in combination with specific embodiments of the application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the specification, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0043] The technical solutions provided by the embodiments of the application will be described in detail below in combination with the drawings.

[0044] Figure 1 The method for calculating shale oil and gas resource quantity provided by the application is a shale oil and gas resource quantity calculation method with varying hydrocarbon discharge efficiency curves under different maturities.

[0045] S101: Obtain the maturity of shale oil and gas, divide shale oil products according to the maturity range of shale oil and gas, determine the oil product types of shale oil and gas, and draw an oil product plane distribution map; the shale oil and gas includes at least one shale oil product.

[0046] The shale oil product types include conventional oil, light oil, volatile oil and condensate gas, etc.

[0047] The maturity range of shale oil and gas corresponding to conventional oil is less than or equal to 0.9%; the maturity range of shale oil and gas corresponding to light oil is greater than 0.9% and less than or equal to 1.3%; the maturity range of shale oil and gas corresponding to light oil is greater than 1.3% and less than or equal to 1.5%; and the maturity range of shale oil and gas corresponding to light oil is greater than 1.5%.

[0048] Specifically, the limits of dividing crude oil types according to the density of ground crude oil are obtained according to the crude oil type division standard, and the limits of dividing oil products according to maturity are obtained through the relationship between the density and maturity of crude oil of a measured well, and the oil product limit division is shown in Table 1.

[0049] Table 1

[0050]

[0051] S102: According to the total organic carbon data of shale oil and gas, a total organic carbon plane distribution map is drawn; the oil product plane distribution map is superimposed on the total organic carbon plane distribution map, and a grid unit of each oil product is constructed in the superimposed distribution map.

[0052] The area with the same thickness interval of oil product and shale is taken as a grid unit.

[0053] Specifically, as shown in the oil product distribution and total organic carbon superimposed graph, the grid unit of each oil product is an area with the same interval of oil product and total organic carbon, there is at least one typical well in each grid unit, and each typical well includes the data of the maturity range of total organic carbon and shale oil and gas. Figure 2

[0054] S103: The recovery coefficient of total organic carbon corresponding to each grid unit is calculated; according to the organic matter abundance evaluation standard, shale oil and gas with different ranges of total organic carbon content are selected from each grid unit to carry out thermal simulation experiment under a closed system, and the corresponding hydrocarbon production rate and hydrocarbon discharge efficiency of each grid unit are obtained.

[0055] Optionally, samples of different oil products are selected to carry out basin simulation, so as to obtain the total organic carbon recovery curve of the samples of different oil products, as shown in the total organic carbon loss curve graph under different maturity. Figure 3

[0056] Optionally, the shale samples with different ranges of total organic carbon content include: shale samples with total organic carbon content of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0% and greater than 2.0%.

[0057] Optionally, for any grid unit, at least one typical well is selected in each grid unit, the total organic carbon content loss curve is drawn through three history recovery, and the recovery coefficient of total organic carbon is obtained through the ratio of total organic carbon after loss to that before loss.

[0058] For any grid unit, the product characteristics of shale with different ranges of total organic carbon content are determined according to shale oil and gas with total organic carbon content of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0% and greater than 2.0%, a scatter plot of the maturity range of different shale oil and gas and the oil production rate, gas production rate and hydrocarbon production rate is established, and the corresponding hydrocarbon production rate of each grid unit is obtained.

[0059] A scatter plot of the maturity range of different shale oil and gas and the discharged oil volume, discharged gas volume and total hydrocarbon volume is established, the discharged oil volume, discharged gas volume and total hydrocarbon volume of each grid unit are obtained, and the corresponding hydrocarbon discharge efficiency of each grid unit is calculated according to the discharged oil volume, discharged gas volume and total hydrocarbon volume of each grid unit, and the formula is:

[0060] ​​ ;

[0061] wherein, P is the expulsion efficiency, is the expulsion oil amount, is the expulsion gas amount, is the total hydrocarbon amount.

[0062] Specifically, the thermal simulation experiment under the closed system specifically includes:

[0063] As shown in Figure 4 , it is a thermal simulation experiment process, selecting a low-maturity shale sample from a field profile, and equally dividing the sample into 8 parts; setting 8 independent quartz tubes, loading the sample into the quartz tubes respectively, and welding after evacuation; setting 8 temperature programs, heating the sample from room temperature to the set temperature at a heating rate of 20℃ / h; breaking the heated quartz tube in the vacuum system, releasing the gas and performing quantitative analysis; using sulfur dioxide to extract the residual oil part of the solid sample, and using carbon dioxide to clean the quartz tube to obtain the expulsion oil, as shown in Figure 4 , it is a quartz tube thermal simulation experiment flow chart.

[0064] According to the shale samples with total organic carbon content of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0% and more than 2.0%, the product characteristics of shale with different ranges of total organic carbon content are determined to establish the scatter point relationship between the maturity range of different shale oil and gas and the oil production rate, gas production rate and hydrocarbon production rate, and the scatter point relationship between the maturity range of different shale oil and gas and the expulsion oil amount, expulsion gas amount and total hydrocarbon amount.

[0065] S104: Calculate the shale oil and gas geological resource amount of each oil product through the total organic carbon content of each grid cell, the recovery coefficient of total organic carbon, the hydrocarbon production rate and the expulsion efficiency.

[0066] Optionally, as shown in Figure 5 , it is a hydrocarbon production rate curve under different maturity and an expulsion efficiency change curve under different maturity, and the formula of the shale oil and gas geological resource amount of each oil product is:

[0067] ;

[0068] wherein, Q is the shale oil and gas geological resource amount, in units of 10 8 t; S is the grid cell area, in units of km 2 ; H is the grid cell effective source rock thickness, in units of m; C is the total organic carbon content of the grid cell; K is the recovery coefficient of total organic carbon; Xo is the hydrocarbon production rate, in units of mg / g; P is the expulsion efficiency, %. Rock density, unit: g / cm 3 .

[0069] In addition / further / further still, in one or more embodiments of the present specification,

[0070] The above is a method for calculating shale oil and gas resources provided by one or more embodiments of the present specification. Based on the same idea, the present specification also provides a corresponding device for calculating shale oil and gas resources, as shown in Figure 6 .

[0071] Figure 6 The device for calculating shale oil and gas resources provided by the present specification includes:

[0072] The oil product division module 601 is configured to obtain the maturity of shale oil and gas, divide shale oil products according to the maturity range of shale oil and gas, and determine the oil product type of shale oil and gas.

[0073] The oil product grid construction module 602 is configured to draw a total organic carbon plane distribution map, superimpose the oil product plane distribution map and the total organic carbon plane distribution map, and construct a grid unit of each oil product in the superimposed distribution map.

[0074] The oil and gas resource quantity calculation module 603 is configured to calculate the shale oil and gas geological resource quantity of each oil product.

[0075] The specific limitation of the device for calculating shale oil and gas resources can be referred to the limitation of the method for calculating shale oil and gas resources in the above, which will not be repeated here. Each module in the device for calculating shale oil and gas resources can be realized by software, hardware and their combination in whole or in part. Each module can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operation corresponding to each module.

[0076] The present specification also provides a computer readable storage medium, which stores a computer program, and the computer program can be used to execute the method for calculating shale oil and gas resources provided by the present specification. Figure 1 The present specification also provides a computer readable storage medium, which stores a computer program, and the computer program can be used to execute the method for calculating shale oil and gas resources provided by the present specification.

[0077] The present specification also provides a computer readable storage medium, which stores a computer program, and the computer program can be used to execute the method for calculating shale oil and gas resources provided by the present specification. Figure 7 The present specification also provides a computer readable storage medium, which stores a computer program, and the computer program can be used to execute the method for calculating shale oil and gas resources provided by the present specification. Figure 7 The present specification also provides a computer readable storage medium, which stores a computer program, and the computer program can be used to execute the method for calculating shale oil and gas resources provided by the present specification. Figure 1 The present specification also provides a computer readable storage medium, which stores a computer program, and the computer program can be used to execute the method for calculating shale oil and gas resources provided by the present specification.

[0078] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, database or other medium used in each embodiment provided in the present application can include at least one of non-volatile and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. The volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0079] The technical features of the above embodiments can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

Claims

1. A method for calculating shale oil and gas resources, characterized in that, include: The maturity of shale oil and gas is obtained, and shale oil products are classified according to the maturity range of shale oil and gas to determine the types of shale oil and gas products, and an oil product distribution map is drawn; the shale oil and gas includes at least one type of shale oil. Based on the total organic carbon data of shale oil and gas, a total organic carbon planar distribution map is drawn; the oil product planar distribution map is overlaid with the total organic carbon planar distribution map, and grid cells for each oil product are constructed within the overlaid distribution map; Calculate the recovery coefficient of total organic carbon for each grid cell; based on the organic matter abundance evaluation standard, select shale oil and gas with different ranges of total organic carbon content from each grid cell to conduct thermal simulation experiments in a closed system, and obtain the hydrocarbon production rate and hydrocarbon expulsion efficiency for each grid cell; The geological resources of shale oil and gas for each type of oil are calculated by using the total organic carbon content, total organic carbon recovery coefficient, hydrocarbon production rate, and hydrocarbon expulsion efficiency of each grid cell.

2. The method for calculating shale oil and gas resources as described in claim 1, characterized in that, The calculation of the total organic carbon recovery coefficient for each grid cell includes: For any given grid cell, at least one typical well is selected for each grid cell. Through three-history recovery, a total organic carbon content loss curve is plotted. The recovery coefficient of total organic carbon is obtained by the ratio of total organic carbon after loss to that before loss.

3. The method for calculating shale oil and gas resources as described in claim 1, characterized in that, The construction of grid cells for each oil product within the superimposed distribution map includes: Areas with the same thickness range for oil and shale are treated as a single grid cell.

4. The method for calculating shale oil and gas resources as described in claim 3, characterized in that, Each grid cell contains at least one typical well, and each typical well includes data on the maturity range of total organic carbon and shale oil and gas.

5. The method for calculating shale oil and gas resources as described in claim 1, characterized in that, The shale oil and gas with different ranges of total organic carbon content include: shale oil and gas with total organic carbon content of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0%, and greater than 2.0%; the selection of shale oil and gas with different ranges of total organic carbon content from each grid cell for thermal simulation experiments specifically includes: For any given grid cell, based on shale oil and gas with total organic carbon contents of 0.4% to 0.6%, 0.6% to 1.0%, 1.0% to 2.0%, and greater than 2.0%, the product characteristics of shale with different total organic carbon contents are determined. A scatter plot of the relationship between the maturity range of different shale oil and gas and the oil production rate, gas production rate, and hydrocarbon production rate is established, and the hydrocarbon production rate corresponding to each grid cell is obtained. A scatter plot was established to show the relationship between different shale oil and gas maturity ranges and the amount of oil, gas, and total hydrocarbons discharged. The discharged oil, gas, and total hydrocarbons for each grid cell were obtained. Based on these figures, the hydrocarbon discharge efficiency for each grid cell was calculated using the following formula: ； In the formula, P For hydrocarbon removal efficiency, To discharge oil, To increase the amount of gas discharged, This represents the total hydrocarbon content.

6. The method for calculating shale oil and gas resources as described in claim 1, characterized in that, The geological resources of shale oil and gas for each type of oil are calculated using the total organic carbon content, total organic carbon recovery coefficient, hydrocarbon production rate, and hydrocarbon expulsion efficiency of each grid cell. The formula is as follows: ； In the formula, Q represents the geological resources of shale oil and gas; S Area of ​​the grid cell; H C represents the effective source rock thickness of the grid cell; C represents the total organic carbon content of the grid cell. K The recovery coefficient of total organic carbon; Xo Hydrocarbon production rate; P For hydrocarbon removal efficiency; This represents the density of the rock.

7. An apparatus for calculating shale oil and gas resources, characterized in that, include: The oil classification module is used to obtain the maturity of shale oil and gas, classify shale oil products according to the maturity range of shale oil and gas, determine the oil product types of shale oil and gas, and draw an oil product distribution map; the shale oil and gas includes at least one shale oil product; The oil product grid construction module is used to draw a total organic carbon planar distribution map based on the total organic carbon data of shale oil and gas; it overlays the oil product planar distribution map with the total organic carbon planar distribution map, and constructs grid cells for each type of oil product within the overlaid distribution map; The oil and gas resource calculation module is used to calculate the recovery coefficient of total organic carbon for each grid cell. Based on the organic matter abundance evaluation standard, shale oil and gas with different ranges of total organic carbon content are selected from each grid cell and thermal simulation experiments are conducted in a closed system to obtain the hydrocarbon production rate and hydrocarbon expulsion efficiency for each grid cell. The geological resources of shale oil and gas for each type of oil are calculated using the total organic carbon content, total organic carbon recovery coefficient, hydrocarbon production rate, and hydrocarbon expulsion efficiency of each grid cell.

8. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the method described in any one of claims 1 to 6.

9. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described in any one of claims 1 to 6.

Images