Method, device and equipment for determining saturation of oil and gas and storage medium
By analyzing TOC, the mixed density of kerogen and oil and gas, and the rock density of the target core, combined with neutron density intersection technology, the problem of low accuracy of oil and gas saturation in low-resistivity shales was solved, and more accurate oil and gas saturation measurements were achieved.
Patent Information
- Application Number
- CN202410339310.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2025-09-23
Smart Images
Figure CN120685529A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of shale oil and gas exploration and development, and in particular to a method, device, equipment and storage medium for determining oil and gas saturation. Background Art
[0002] As unconventional oil and gas exploration and development continues to deepen, the factors affecting the carbon content of the research objects are becoming increasingly complex.
[0003] Electrical logging is currently used to determine the hydrocarbon saturation in shale reservoirs. However, factors such as shale graphitization, pyrite development, the added conductivity of clay minerals, and high carbon content in shale reservoirs can cause shale reservoirs to exhibit low resistivity on electrical logging. Consequently, the hydrocarbon saturation determined by electrical logging is far lower than the actual saturation, resulting in low accuracy in determining the hydrocarbon saturation of low-resistivity shales. Summary of the Invention
[0004] The present application provides a method, device, equipment and storage medium for determining oil and gas saturation, which are used to solve the technical problem of low accuracy in determining the oil and gas saturation of low-resistivity shale.
[0005] In a first aspect, the present application provides a method for determining oil and gas saturation, comprising:
[0006] Determine the target low-resistivity shale by core analysis of total organic carbon (TOC);
[0007] Obtaining the mixed density of kerogen and oil and gas and the rock density of the target area corresponding to the target low-resistivity shale;
[0008] Performing data processing on the mixed density of the kerogen and oil and gas, the rock density, and the TOC of the target core analysis to obtain the remaining hydrocarbon content of the target low-resistivity shale;
[0009] determining a target total porosity of the target low-resistivity shale;
[0010] The oil and gas saturation of the target low-resistivity shale is determined based on the residual hydrocarbon content and the target total porosity.
[0011] In one possible embodiment, determining a target core analysis TOC of a target low-resistivity shale includes:
[0012] Acquire multiple historical information of low-resistivity shale in the target area, wherein the historical information includes historical logging curves and historical core analysis TOC corresponding to multiple historical logging characteristics;
[0013] determining an organic carbon content treatment model for the target area based on the plurality of historical information;
[0014] According to the organic carbon content processing model, the target core analysis TOC of the target low-resistivity shale is determined.
[0015] In one possible embodiment, determining the organic carbon content processing model of the target area based on the plurality of historical information includes:
[0016] performing correlation analysis on the multiple historical logging features and the historical core analysis TOC according to the multiple historical information to determine at least one correlated logging feature;
[0017] Determine the correspondence between each relevant logging feature and the TOC of historical core analysis;
[0018] The corresponding relationship between each relevant well logging feature and the TOC of historical core analysis is fitted to obtain the organic carbon content processing model.
[0019] In one possible embodiment, determining the target TOC of the target low-resistivity shale according to the organic carbon content processing model includes:
[0020] Acquiring at least one relevant logging curve corresponding to at least one relevant logging feature of the target low-resistivity shale;
[0021] The at least one relevant well logging curve is processed using the organic carbon content processing model to obtain a target core analysis TOC of the target low-resistivity shale.
[0022] In one possible embodiment, data processing is performed on the mixed density of the kerogen and oil and gas, the rock density, and the target TOC to obtain the remaining hydrocarbon content of the target low-resistivity shale, including:
[0023] determining a ratio of the rock density to the mixed density of the kerogen and oil and gas as a first value;
[0024] The product of the first value and the target core analysis TOC is determined as the remaining hydrocarbon content of the target low-resistivity shale.
[0025] In one possible embodiment, determining the target total porosity of the target low-resistivity shale includes:
[0026] Obtaining a target neutron density curve of the target low-resistivity shale;
[0027] determining a crossplot of the target neutron density curve;
[0028] The target total porosity is obtained by analyzing and processing the intersection diagram using intersection triangulation technology.
[0029] In one possible embodiment, determining the oil and gas saturation of the target low-resistivity shale according to the residual hydrocarbon content and the target total porosity includes:
[0030] The remaining hydrocarbon content is divided by the target total porosity to obtain the oil and gas saturation.
[0031] In a second aspect, an embodiment of the present application provides a device for determining oil and gas saturation, comprising a first determination module, an acquisition module, a data processing module, a second determination module, and a third determination module:
[0032] The first determination module is used to determine the target core analysis TOC of the target low-resistivity shale;
[0033] The acquisition module is used to obtain the mixed density of kerogen and oil and gas and the rock density of the target area corresponding to the target low-resistivity shale;
[0034] The data processing module is used to process the mixed density of the kerogen and oil and gas, the rock density and the target TOC to obtain the residual hydrocarbon content of the target low-resistivity shale;
[0035] The second determination module is used to determine the target total porosity of the target low-resistivity shale;
[0036] The third determination module is configured to determine the oil and gas saturation of the target low-resistivity shale according to the residual hydrocarbon content and the target total porosity.
[0037] In one possible embodiment, the first determining module is specifically configured to:
[0038] Acquire multiple historical information of low-resistivity shale in the target area, wherein the historical information includes historical logging curves and historical core analysis TOC corresponding to multiple historical logging characteristics;
[0039] determining an organic carbon content treatment model for the target area based on the plurality of historical information;
[0040] According to the organic carbon content processing model, the target core analysis TOC of the target low-resistivity shale is determined.
[0041] In one possible embodiment, the first determining module is specifically configured to:
[0042] performing correlation analysis on the multiple historical logging features and the historical core analysis TOC according to the multiple historical information to determine at least one correlated logging feature;
[0043] Determine the correspondence between each relevant logging feature and the TOC of historical core analysis;
[0044] The corresponding relationship between each relevant well logging feature and the TOC of historical core analysis is fitted to obtain the organic carbon content processing model.
[0045] In one possible embodiment, the first determining module is specifically configured to:
[0046] Acquiring at least one relevant logging curve corresponding to at least one relevant logging feature of the target low-resistivity shale;
[0047] The at least one relevant well logging curve is processed using the organic carbon content processing model to obtain a target core analysis TOC of the target low-resistivity shale.
[0048] In one possible embodiment, the data processing module is specifically configured to:
[0049] determining a ratio of the rock density to the mixed density of the kerogen and oil and gas as a first value;
[0050] The product of the first value and the target core analysis TOC is determined as the remaining hydrocarbon content of the target low-resistivity shale.
[0051] In one possible embodiment, the second determining module is specifically configured to:
[0052] determining a target neutron density curve of the target low-resistivity shale;
[0053] Obtain the intersection plot of low-resistivity shale and neutron density curve;
[0054] The target total porosity is obtained by analyzing and processing the target neutron density curve and the intersection diagram using intersection triangulation technology.
[0055] In one possible embodiment, the third determining module is specifically configured to:
[0056] The remaining hydrocarbon content is divided by the target total porosity to obtain the oil and gas saturation.
[0057] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a memory and a processor,
[0058] The memory stores computer-executable instructions;
[0059] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the method for determining oil and gas saturation as described in any one of the first aspects.
[0060] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method for determining oil and gas saturation as described in any one of the first aspects.
[0061] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method for determining oil and gas saturation as described in any one of the first aspects.
[0062] The method, device, equipment and storage medium for determining oil and gas saturation provided in the present application can determine the residual hydrocarbon content of the target low-resistance shale by analyzing the TOC, the mixed density of kerogen and oil and gas, and the rock density of the target core of the target low-resistance shale, and determine the oil and gas saturation based on the target total porosity and the residual hydrocarbon content, thereby avoiding the influence of the resistivity of the target low-resistance shale and improving the accuracy of determining the oil and gas saturation of the low-resistance shale. BRIEF DESCRIPTION OF THE DRAWINGS
[0063] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0064] Figure 1 A schematic diagram of an application scenario provided in an embodiment of the present application;
[0065] Figure 2 A flow chart of a method for determining oil and gas saturation provided in an embodiment of the present application;
[0066] Figure 3 A schematic flow chart of another method for determining oil and gas saturation provided in an embodiment of the present application;
[0067] Figure 4 A schematic diagram of the architecture of a method for determining oil and gas saturation provided in an embodiment of the present application;
[0068] Figure 5 A schematic diagram of the structure of a device for determining oil and gas saturation provided in an embodiment of the present application;
[0069] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.
[0070] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION
[0071] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
[0072] It should be noted that the method and device for determining oil and gas saturation involved in this application can be used in the field of shale oil and gas exploration and development technology, and can also be used in any field other than the field of shale oil and gas exploration and development technology. The application field of the method and device for determining oil and gas saturation involved in this application is not limited.
[0073] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of this application. Figure 1 , including exploration equipment 101 and processing equipment 102. Before drilling and extracting oil or natural gas, it is necessary to explore the oil and gas content of the target low-resistance shale. The exploration equipment 101 can be used to explore the area where the target low-resistance shale is located to obtain exploration data, which can be a logging curve. The processing equipment 102 can obtain the exploration data of the exploration equipment 101, determine the target core analysis total organic carbon (TOC) of the target low-resistance shale, and obtain the mixed density of kerogen and oil and gas and the rock density of the target area corresponding to the target low-resistance shale. The mixed density of kerogen and oil and gas, the rock density and the target core analysis TOC are processed to obtain the residual hydrocarbon content of the target low-resistance shale. After determining the target total porosity of the target low-resistance shale, the oil and gas saturation of the target low-resistance shale can be determined based on the residual hydrocarbon content and the target total porosity.
[0074] Electrical logging is currently used to determine the hydrocarbon saturation in shale reservoirs. However, due to factors such as shale graphitization, the development of pyrite, the added conductivity of clay minerals, and high carbon content, shale reservoirs exhibit low resistivity on electrical logging. Consequently, the hydrocarbon saturation determined by electrical logging is far lower than the actual saturation, resulting in low accuracy in determining the hydrocarbon saturation.
[0075] In the embodiment of the present application, the TOC, the mixed density of kerogen and oil and gas, and the rock density of the target core of the target low-resistivity shale can be analyzed to determine the residual hydrocarbon content of the target low-resistivity shale, and the oil and gas saturation can be determined based on the target total porosity and the residual hydrocarbon content, thereby avoiding the influence of the resistivity of the target low-resistivity shale and improving the accuracy of determining the oil and gas saturation.
[0076] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.
[0077] Figure 2 This is a flow chart of a method for determining oil and gas saturation provided in an embodiment of the present application. Figure 2 , the method may include:
[0078] S201. Determine the target core analysis TOC of the target low-resistivity shale.
[0079] The execution subject of the embodiment of the present application can be a processing device, or a device for determining oil and gas saturation disposed in the processing device. The device for determining oil and gas saturation can be implemented by software or a combination of software and hardware.
[0080] Total organic carbon (TOC) is an important indicator for measuring the content of organic matter, which represents the total amount of carbon contained in organic matter.
[0081] The target low-resistivity shale is the low-resistivity shale whose oil and gas saturation is to be measured, wherein the low-resistivity shale is characterized by low resistivity.
[0082] The target core analysis TOC of the target low-resistivity shale can be determined as follows: obtain multiple historical information of the low-resistivity shale in the target area; determine an organic carbon content processing model for the target area based on the multiple historical information; and determine the target core analysis TOC of the target low-resistivity shale based on the organic carbon content processing model.
[0083] The historical information may include well logging curves corresponding to multiple historical logging features and historical core analysis TOC.
[0084] For example, assuming that there are three historical information in the target area corresponding to the target low-resistivity shale, namely historical information 1, historical information 2, and historical information 3. Assuming that there are three logging curves corresponding to historical logging features in the historical information, each historical information can be shown in Table 1.
[0085] Table 1
[0086]
[0087] S202. Obtain the mixed density of kerogen and oil and gas and the rock density of the target low-resistivity shale in the target area.
[0088] The mixed density of kerogen and oil and gas can be the mixed density of kerogen and oil and gas in the target area, where the unit of the mixed density of kerogen and oil and gas is g·cm -3 .
[0089] Rock density, also known as hydrocarbon-generating rock density, can be the weight of the rock skeleton per unit rock volume in the target area. The unit of rock density is g·cm -3 .
[0090] The mixed density of kerogen and oil and gas and the rock density can be obtained through experimental testing, which is not described in detail in the examples of this application.
[0091] S203. Process the data of the mixed density of kerogen and oil and gas, the rock density, and the TOC of the target core analysis to obtain the remaining hydrocarbon content of the target low-resistivity shale.
[0092] The residual hydrocarbon content (Vestigial Hydrocarbon Content, VHC) can be used to indicate the oil and gas content remaining in the pores of the source rock, where the unit of the residual hydrocarbon content is %.
[0093] The remaining hydrocarbon content can be determined as follows: the ratio of the rock density to the mixed density of kerogen and oil and gas is determined as a first value; the product of the first value and the TOC of the target core analysis is determined as the remaining hydrocarbon content of the target low-resistivity shale.
[0094] The formula expression can be shown as follows:
[0095] VHC=TOC·ρ hr / ρ gog
[0096] Among them, VHC is the residual hydrocarbon content of the target low-resistivity shale, TOC is the total organic carbon of the low-resistivity shale in the target area, ρ hr is the rock density of the target area, ρ gog is the mixed density of kerogen and oil and gas in the target area's source rock.
[0097] For example, assume the target core analysis TOC of the target low-resistivity shale is 2%, and the rock density of the target area is 2.5 g·cm -3 The mixed density of kerogen and oil and gas in the target area is 1.25 g·cm -3 , it can be determined that the first value is 2, and the remaining hydrocarbon content of the target low-resistivity shale is 4%.
[0098] S204: Determine the target total porosity of the target low-resistivity shale.
[0099] The total porosity of the target low-resistivity shale reservoir can be calculated using the neutron density intersection method. The neutron density intersection method can analyze the target low-resistivity shale through neutron logging and density logging to determine the target total porosity of the target low-resistivity shale.
[0100] The target total porosity can be determined by: obtaining a target neutron density curve of the target low-resistivity shale; determining an intersection plot of the target neutron density curve; and analyzing and processing the intersection plot using intersection triangulation technology to obtain the target total porosity.
[0101] For example, assuming that the target neutron density curve of the target low-resistivity shale is neutron density curve 1, determine the intersection of neutron density curve 1 Figure 1 , we can use the intersection triangulation technology to Figure 1 After analytical processing, the target total porosity was found to be 28%.
[0102] S205. Determine the oil and gas saturation of the target low-resistivity shale based on the remaining hydrocarbon content and the target total porosity.
[0103] The remaining hydrocarbon content of low-resistivity shale can also be calculated based on the total porosity and oil and gas saturation. The formula can be shown as follows:
[0104]
[0105] Among them, VHC is the residual hydrocarbon content of low-resistivity shale, is the total porosity of low-resistivity shale, S og It is the oil and gas saturation of low-resistivity shale.
[0106] Based on the remaining hydrocarbon content of the target low-resistivity shale determined in S203 and the total porosity target of the target low-resistivity shale obtained in S204, the remaining hydrocarbon content can be divided by the target total porosity to obtain the oil and gas saturation of the target low-resistivity shale.
[0107] For example, assuming that the residual hydrocarbon content of the target low-resistivity shale is 4% and the target total porosity is 5%, it can be determined that the oil and gas saturation of the target low-resistivity shale is 80%.
[0108] The method for determining oil and gas saturation provided in the embodiment of the present application can determine the residual hydrocarbon content of the target low-resistivity shale by analyzing the TOC, the mixed density of kerogen and oil and gas, and the rock density of the target core of the target low-resistivity shale, and determine the oil and gas saturation based on the target total porosity and the residual hydrocarbon content, thereby avoiding the influence of the resistivity of the target low-resistivity shale on the calculation of the oil and gas saturation and improving the accuracy of determining the oil and gas saturation.
[0109] Figure 3 This is a flow chart of another method for determining oil and gas saturation provided in an embodiment of the present application. Figure 3 , the method may include:
[0110] S301. Acquire multiple historical information of low-resistivity shales in a target area.
[0111] The historical information may include historical logging curves corresponding to multiple historical logging features and historical core analysis TOC.
[0112] The historical logging characteristics may be natural gamma characteristics, uranium characteristics, density characteristics, and acoustic transit time characteristics, that is, the historical logging curves may be the natural gamma logging curve corresponding to the natural gamma characteristics, the uranium logging curve corresponding to the uranium characteristics, the density logging curve corresponding to the density characteristics, and the acoustic transit time logging curve corresponding to the acoustic transit time characteristics, etc.
[0113] For example, assuming that there are three historical information in the target area, namely historical information 1, historical information 2, and historical information 3, as shown in Table 1, assuming that historical logging feature 1 is a natural gamma ray feature, then logging curves 11, 21, and 31 are natural gamma ray logging curves; assuming that historical logging feature 2 is a uranium feature, then logging curves 12, 22, and 32 are uranium logging curves; assuming that historical logging feature 3 is a density feature, then logging curves 13, 23, and 33 are density logging curves.
[0114] S302: Based on multiple historical information, perform correlation analysis on multiple historical logging features and historical core analysis TOC to determine at least one relevant logging feature.
[0115] At least one relevant well logging feature can be determined in the following manner: among multiple historical information, multiple historical logging curves corresponding to each historical well logging feature are determined; for any historical well logging feature, the correlation between the multiple historical logging curves and the corresponding historical core analysis TOC is analyzed and processed to determine the correlation between the historical well logging feature and the historical core analysis TOC; based on the correlation between each historical well logging feature and the historical core analysis TOC, at least one relevant well logging feature is determined.
[0116] For example, assuming that multiple historical information can be shown in Table 1, historical logging feature 1 corresponds to logging curve 11, logging curve 21, and logging curve 31, historical logging feature 2 corresponds to logging curve 12, logging curve 22, and logging curve 32, and historical logging feature 3 corresponds to logging curve 13, logging curve 23, and logging curve 33. For historical logging feature 1, correlation analysis can be performed on logging curve 11 and TOC1, logging curve 21 and TOC2, and logging curve 31 and TOC3 to determine the correlation between historical logging feature 1 and historical TOC; for historical logging feature 2, correlation analysis can be performed on logging curve 12 and TOC1, logging curve 22 and TOC2, and logging curve 32 and TOC3 to determine the correlation between historical logging feature 2 and historical TOC; for historical logging feature 3, correlation analysis can be performed on logging curve 13 and TOC1, logging curve 23 and TOC2, and logging curve 33 and TOC3 to determine the correlation between historical logging feature 3 and historical core analysis TOC. At least one correlated well logging feature can be determined from historical well logging feature 1, historical well logging feature 2, and historical well logging feature 3 based on the correlation between historical well logging feature 1 and historical core analysis TOC, the correlation between historical well logging feature 2 and historical core analysis TOC, and the correlation between historical well logging feature 3 and historical core analysis TOC.
[0117] Furthermore, the correlation value of each historical logging feature and the TOC of the historical core analysis can be determined based on the correlation between each historical logging feature and the TOC of the historical core analysis; the historical logging feature with a correlation value greater than a first threshold is determined as a relevant logging feature, so as to determine at least one relevant logging feature.
[0118] For example, assuming that there are three historical logging features, namely historical logging feature 1, historical logging feature 2, and historical logging feature 3, assuming that the correlation value between historical logging feature 1 and historical core analysis TOC is 0.7, assuming that the correlation value between historical logging feature 2 and historical core analysis TOC is 0.2, and the correlation value between historical logging feature 3 and historical core analysis TOC is 0.6, assuming that the first threshold is 0.5, it can be determined that historical logging feature 1 and historical logging feature 1 are correlated logging features.
[0119] S303: Determine the corresponding relationship between each relevant logging feature and the TOC of historical core analysis.
[0120] Based on multiple historical information, the correspondence between each relevant logging feature and the TOC of historical core analysis can be determined.
[0121] S304: Fitting the corresponding relationship between each relevant well logging feature and the TOC of historical core analysis to obtain an organic carbon content processing model.
[0122] The corresponding relationship between each relevant logging feature and the TOC of historical core analysis can be fitted through single-factor fitting or multi-factor polynomial fitting to obtain an organic carbon content processing model.
[0123] S305: Obtain at least one relevant logging curve corresponding to at least one relevant logging feature of the target low-resistivity shale.
[0124] At least one relevant logging curve of the target low-resistivity shale can be obtained through well logging technology.
[0125] For example, assuming there are three relevant logging features, namely relevant logging feature 1, relevant logging feature 2 and relevant logging feature 3, then relevant logging curve 1 corresponding to relevant logging feature 1, relevant logging curve 2 corresponding to relevant logging feature 2, and relevant logging curve 3 corresponding to relevant logging feature 3 can be obtained.
[0126] S306 , performing data processing on at least one relevant well logging curve using an organic carbon content processing model to obtain a target core analysis TOC of the target low-resistivity shale.
[0127] At least one relevant well logging curve may be used as input data of an organic carbon content processing model, and output data of the organic carbon content processing model may be determined as a target core analysis TOC of the target low-resistivity shale.
[0128] For example, assuming there are three relevant logging curves, namely relevant logging curve 1, relevant logging curve 2 and relevant logging curve 3, the closed logging curves, namely relevant logging curve 1, relevant logging curve 2 and relevant logging curve 3, are input into the organic carbon content processing model to obtain the target core analysis TOC1 of the target low-resistivity shale.
[0129] S307: Obtain the mixed density of kerogen and oil and gas and the rock density of the target low-resistivity shale in the target area.
[0130] S308. Process the mixed density of kerogen and oil and gas, the rock density, and the TOC of the target core analysis to obtain the remaining hydrocarbon content of the target low-resistivity shale.
[0131] S309: Determine the target total porosity of the target low-resistivity shale.
[0132] S310. Determine the oil and gas saturation of the target low-resistivity shale based on the remaining hydrocarbon content and the target total porosity.
[0133] The specific execution process of S307-S310 can refer to the execution process of S202-S205, which will not be repeated here.
[0134] The method for determining oil and gas saturation provided in the embodiment of the present application can determine an organic carbon content processing model through historical information, process at least one relevant logging curve of the target low-resistivity shale through the organic carbon content processing model, and obtain the target core analysis TOC of the target low-resistivity shale. The residual hydrocarbon content of the target low-resistivity shale is determined through the target core analysis TOC, the mixed density of kerogen and oil and gas, and the rock density. The oil and gas saturation is determined based on the target total porosity and the residual hydrocarbon content, avoiding the influence of the resistivity of the target low-resistivity shale and improving the accuracy of determining the oil and gas saturation.
[0135] Figure 4 This is a schematic diagram of the architecture of a method for determining oil and gas saturation provided in an embodiment of the present application. Figure 4 , multiple historical information about low-resistivity shale in the target area can be obtained. This historical information can include multiple historical logging features and historical core analysis TOC. Correlation analysis can be performed on the multiple historical logging features and the historical core analysis TOC to identify at least one relevant logging feature from the multiple historical logging features. After determining the correspondence between each relevant logging feature and the historical core analysis TOC, a fitting process can be performed on the correspondence between each relevant logging feature and the historical core analysis TOC to obtain an organic carbon content processing model. At least one relevant logging curve corresponding to the at least one relevant logging feature of the target low-resistivity shale can be obtained. Data processing of the at least one relevant logging curve using the organic carbon content processing model can be performed to obtain a target core analysis TOC for the target low-resistivity shale.
[0136] The kerogen-oil-gas mixed density and rock density of the target low-resistivity shale in the target area can be obtained. The ratio of the rock density to the kerogen-oil-gas mixed density is determined as a first value. The product of this first value and the TOC of the target core analysis is used to determine the residual hydrocarbon content of the target low-resistivity shale. A target neutron density curve for the target low-resistivity shale can be determined, and based on this target neutron density curve, the target total porosity can be determined. The residual hydrocarbon content is divided by the target total porosity to obtain the oil and gas saturation.
[0137] Figure 5 This is a schematic diagram of the structure of a device for determining oil and gas saturation provided in an embodiment of the present application. Figure 5 The oil and gas saturation determination device 10 may include a first determination module 11, an acquisition module 12, a data processing module 13, a second determination module 14, and a third determination module 15:
[0138] The first determination module 11 is used to determine the target core analysis TOC of the target low-resistivity shale;
[0139] The acquisition module 12 is used to obtain the mixed density of kerogen and oil and gas and the rock density of the target low-resistivity shale corresponding to the target area;
[0140] The data processing module 13 is used to process the mixed density of kerogen and oil and gas, the rock density and the TOC of the target core analysis to obtain the remaining hydrocarbon content of the target low-resistivity shale;
[0141] The second determination module 14 is used to determine the target total porosity of the target low-resistivity shale;
[0142] The third determination module 15 is used to determine the oil and gas saturation of the target low-resistivity shale according to the residual hydrocarbon content and the target total porosity.
[0143] The device for determining oil and gas saturation provided in the embodiment of the present application can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar and will not be repeated here.
[0144] In one possible embodiment, the first determining module 11 is specifically configured to:
[0145] Obtain multiple historical information of low-resistivity shales in the target area, including historical logging curves corresponding to multiple historical logging characteristics and historical core analysis TOC;
[0146] Determine the organic carbon content treatment model for the target area based on multiple historical information;
[0147] According to the organic carbon content processing model, the target core analysis TOC of the target low-resistivity shale is determined.
[0148] In one possible embodiment, the first determining module 11 is specifically configured to:
[0149] Based on the plurality of historical information, correlation analysis is performed on the plurality of historical logging features and the TOC of historical core analysis to determine at least one relevant logging feature;
[0150] Determine the correspondence between each relevant logging feature and the TOC of historical core analysis;
[0151] The corresponding relationship between each relevant logging feature and the TOC of historical core analysis was fitted to obtain the organic carbon content processing model.
[0152] In one possible embodiment, the first determining module 11 is specifically configured to:
[0153] Acquiring at least one relevant logging curve corresponding to at least one relevant logging feature of the target low-resistivity shale;
[0154] Data processing is performed on at least one relevant well logging curve using an organic carbon content processing model to obtain a target core analysis TOC of the target low-resistivity shale.
[0155] In one possible embodiment, the data processing module 13 is specifically configured to:
[0156] determining a ratio of the rock density to the mixed density of the kerogen and the oil and gas as a first value;
[0157] The product of the first value and the target core analysis TOC is determined as the remaining hydrocarbon content of the target low-resistivity shale.
[0158] In one possible embodiment, the second determining module 14 is specifically configured to:
[0159] Obtain target neutron density curve of target low-resistivity shale;
[0160] Determine the crossplot of the target neutron density curve;
[0161] The target total porosity is obtained by analyzing and processing the intersection diagram using the intersection triangulation technique.
[0162] In one possible embodiment, the third determining module 15 is specifically configured to:
[0163] The remaining hydrocarbon content is divided by the target total porosity to obtain the oil and gas saturation.
[0164] The device for determining oil and gas saturation provided in the embodiment of the present application can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar and will not be repeated here.
[0165] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 6 The electronic device 20 may include a processor 21 and a memory 22. Exemplarily, the processor 21 and the memory 22 are interconnected via a bus 23.
[0166] The memory 22 stores computer-executable instructions;
[0167] The processor 21 executes the computer-executable instructions stored in the memory 22 , so that the processor 21 executes the method for determining oil and gas saturation as shown in the above method embodiment.
[0168] Accordingly, an embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, they are used to implement the method for determining the oil and gas saturation of the above-mentioned method embodiment.
[0169] Accordingly, an embodiment of the present application may also provide a computer program product, including a computer program. When the computer program is executed by a processor, the method for determining the oil and gas saturation shown in the above method embodiment can be implemented.
[0170] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0171] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0172] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.
[0173] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.
[0174] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.
[0175] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
[0176] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.
[0177] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.
[0178] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.
Claims
1. A method for determining oil and gas saturation, characterized in that: include: Determine the target low-resistivity shale by core analysis of total organic carbon (TOC); Obtaining the mixed density of kerogen and oil and gas and the rock density of the target area corresponding to the target low-resistivity shale; Performing data processing on the mixed density of the kerogen and oil and gas, the rock density, and the TOC of the target core analysis to obtain the remaining hydrocarbon content of the target low-resistivity shale; determining a target total porosity of the target low-resistivity shale; The oil and gas saturation of the target low-resistivity shale is determined based on the residual hydrocarbon content and the target total porosity.
2. The method according to claim 1, characterized in that Determine the target core analysis TOC of the target low-resistivity shale, including: Acquire multiple historical information of low-resistivity shale in the target area, wherein the historical information includes historical logging curves and historical core analysis TOC corresponding to multiple historical logging characteristics; determining an organic carbon content treatment model for the target area based on the plurality of historical information; According to the organic carbon content processing model, the target core analysis TOC of the target low-resistivity shale is determined.
3. The method according to claim 2, characterized in that Determining an organic carbon content processing model for the target area based on the plurality of historical information includes: performing correlation analysis on the multiple historical logging features and the historical core analysis TOC according to the multiple historical information to determine at least one correlated logging feature; Determine the correspondence between each relevant logging feature and the TOC of historical core analysis; The corresponding relationship between each relevant well logging feature and the TOC of historical core analysis is fitted to obtain the organic carbon content processing model.
4. The method according to claim 2, characterized in that Determining the target core analysis TOC of the target low-resistivity shale according to the organic carbon content processing model includes: Acquiring at least one relevant logging curve corresponding to at least one relevant logging feature of the target low-resistivity shale; The at least one relevant well logging curve is processed using the organic carbon content processing model to obtain a target core analysis TOC of the target low-resistivity shale.
5. The method according to any one of claims 1 to 4, characterized in that Data processing is performed on the mixed density of the kerogen and oil and gas, the rock density, and the target core analysis TOC to obtain the remaining hydrocarbon content of the target low-resistivity shale, including: determining a ratio of the rock density to the mixed density of the kerogen and oil and gas as a first value; The product of the first value and the target core analysis TOC is determined as the remaining hydrocarbon content of the target low-resistivity shale.
6. The method according to any one of claims 1 to 6, characterized in that Determining the target total porosity of the target low-resistivity shale includes: Obtaining a target neutron density curve of the target low-resistivity shale; determining a crossplot of the target neutron density curve; The target total porosity is obtained by analyzing and processing the intersection diagram using intersection triangulation technology.
7. The method according to any one of claims 1 to 5, characterized in that Determining the oil and gas saturation of the target low-resistivity shale according to the residual hydrocarbon content and the target total porosity includes: The residual hydrocarbon content is divided by the target total porosity to obtain the oil and gas saturation of the target low-resistivity shale.
8. A device for determining oil and gas saturation, characterized in that: It includes a first determination module, an acquisition module, a data processing module, a second determination module and a third determination module: The first determination module is used to determine the target core analysis TOC of the target low-resistivity shale; The acquisition module is used to obtain the mixed density of kerogen and oil and gas and the rock density of the target area corresponding to the target low-resistivity shale; The data processing module is used to process the mixed density of the kerogen and oil and gas, the rock density and the target core analysis TOC to obtain the remaining hydrocarbon content of the target low-resistivity shale; The second determination module is used to determine the target total porosity of the target low-resistivity shale; The third determination module is configured to determine the oil and gas saturation of the target low-resistivity shale according to the residual hydrocarbon content and the target total porosity.
9. An electronic device, characterized in that: include: memory and processor, The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method for determining oil and gas saturation according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method for determining oil and gas saturation according to any one of claims 1 to 7.
11. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method for determining oil and gas saturation according to any one of claims 1 to 7 is implemented.