A quantitative evaluation method for the reservoir capacity of tight gas reservoirs

Abstract

The present application discloses a quantitative evaluation method for the reservoir capacity of tight gas reservoirs, which relates to the field of oil and gas engineering. The method includes preparing standard cores, obtaining the Young's modulus of the cores, the types of minerals, and the Young's modulus and mineral percentage content of various minerals; classifying the minerals in the standard cores to obtain drag minerals, boosting minerals, and mixed minerals; obtaining the ultimate Young's modulus of the drag minerals and boosting minerals, the percentage content of the drag minerals, the percentage content of the mixed minerals, and the percentage content of the boosting minerals; determining the reservoir capacity index to evaluate the reservoir capacity of the reservoir corresponding to the standard cores; and dividing the reservoir into reservoir grades based on the reservoir capacity. The method of the present application is simple and feasible, has good adaptability to the oil field, and also greatly reduces the oil field test cost, and has good application prospects and popularization value for similar tight gas reservoirs.

Description

Technical Field

[0001] This application relates to the field of oil and gas engineering, and particularly to a quantitative evaluation method for the storage capacity of tight gas reservoirs. Background Art

[0002] Tight gas has become an important strategic resource for increasing reserves and production and supporting high-quality development in each oilfield. Tight gas resources in China are mainly distributed in multiple large basins within the territory, with huge development potential. Finding favorable reservoir sweet spots and conducting comprehensive evaluations to determine the quality of reservoirs, that is, the material basis storage capacity of reservoirs, is the primary task of exploration, development, and reservoir stimulation. Comprehensive evaluation of reservoirs will continuously affect subsequent strategic layouts and test plans.

[0003] Through a large number of core samplings and on-site detections in the oilfield, it is confirmed that compared with North American tight oil and gas reservoirs, continental tight gas reservoirs in China have strong heterogeneity, discontinuous sand bodies, developed alternating sand and mud deposits, very tight pore throats, and poor connectivity, resulting in greater challenges in the process of reservoir evaluation.

[0004] Currently, the evaluation methods for the material basis storage capacity of tight gas mainly include comprehensive evaluations from aspects such as core sampling experiments in the oilfield, fine logging interpretation, reservoir sweet spots and quality, CT and nuclear magnetic tests, etc. However, the test costs are relatively high, the cycle is relatively long, and the prediction parameters for the material basis storage capacity of reservoirs are diverse and complex, making it difficult to accurately and quantitatively evaluate. Summary of the Invention

[0005] The purpose of the present invention is to provide a quantitative evaluation method for the storage capacity of tight gas reservoirs. This method classifies reservoir minerals based on the Young's modulus of rock single minerals, further calculates the percentage content of different types of minerals, and quantitatively calculates the storage capacity index based on this, and divides the reservoirs into grades.

[0006] In a first aspect, an embodiment of the present application provides a quantitative evaluation method for the storage capacity of tight gas reservoirs, including: preparing a standard core based on a rock sample and obtaining the physical parameters of the standard core; wherein, the physical parameters include the Young's modulus of the core, the types of minerals, and the Young's modulus and mineral percentage content of each type of mineral; classifying each type of mineral in the standard core into drag minerals, boost minerals, and mixed minerals according to the physical parameters; determining the ultimate Young's modulus of the drag minerals and the ultimate Young's modulus of the boost minerals according to the physical parameters; respectively determining the percentage content of the drag minerals, boost minerals, and mixed minerals in the standard core based on the ultimate Young's modulus of the drag minerals and the ultimate Young's modulus of the boost minerals combined with the physical parameters, obtaining the percentage content of the drag minerals, the percentage content of the boost minerals, and the percentage content of the mixed minerals; determining the storage capacity index of the standard core based on the percentage content of the drag minerals, the percentage content of the boost minerals, and the percentage content of the mixed minerals to evaluate the storage capacity of the reservoir corresponding to the standard core.

[0007] In combination with the first aspect, in a possible implementation, the obtaining of the physical parameters of the standard core includes: performing microscopic measurement on the standard core to obtain the mineral types in the standard core and the mineral percentage content of each type of mineral; obtaining the core Young's modulus of the standard core and the mineral Young's modulus of each type of mineral by using a mechanical testing system.

[0008] In combination with the first aspect, in a second possible implementation, the classifying of each type of mineral in the standard core into drag minerals, boosting minerals, and mixed minerals according to the physical parameters includes: classifying each type of mineral in the standard core according to the mineral Young's modulus of each type of mineral and the core Young's modulus; classifying the minerals with a mineral Young's modulus lower than the core Young's modulus as drag minerals; classifying the minerals with a mineral Young's modulus higher than the core Young's modulus as boosting minerals; and classifying the mixed part of the boosting minerals and the drag minerals as mixed minerals.

[0009] In combination with the first aspect, in a third possible implementation, the ultimate Young's modulus of the drag minerals is the sum of the mineral Young's moduli of all mineral types in the drag minerals; the ultimate Young's modulus of the boosting minerals is the sum of the mineral Young's moduli of all mineral types in the boosting minerals.

[0010] In combination with the third possible implementation of the first aspect, in a fourth possible implementation, the calculation method of the ultimate Young's modulus of the drag minerals includes: ; where represents the ultimate Young's modulus of the drag minerals, represents the number of mineral types in the drag minerals, represents the mineral type i in the drag minerals represents the mineral percentage content, i represents the mineral Young's modulus of the mineral type in the drag minerals; the calculation method of the ultimate Young's modulus of the boosting minerals includes: ; where represents the ultimate Young's modulus of the boosting minerals, represents the number of mineral types in the standard core, represents the mineral type i in the boosting minerals represents the mineral percentage content, i represents the mineral Young's modulus of the mineral type , represents the number of mineral types in the drag minerals.

[0011] In combination with the first aspect, in a fifth possible implementation, the calculation method of the drag mineral percentage content includes: ; where Indicates the percentage content of the drag minerals, Indicates the Young's modulus of the core, Indicates the ultimate Young's modulus of the drag minerals, Indicates the number of mineral species in the drag minerals; Indicates the mineral species in the drag minerals i Of the percentage content of the minerals; The calculation method of the percentage content of the raised minerals includes: ; Wherein, Indicates the percentage content of the raised minerals, Indicates the ultimate Young's modulus of the raised minerals, Indicates the number of mineral species in the standard core, Indicates the percentage content of the mineral species i in the raised minerals; The calculation method of the percentage content of the mixed minerals includes: ; Wherein, Indicates the percentage content of the mixed minerals, .

[0012] Combined with the first aspect, in the sixth possible implementation manner, the calculation method of the reservoir capacity index includes: ; Wherein, Indicates the reservoir capacity index of the standard core, Indicates the mineral species in the drag minerals i Of the percentage content, Indicates the mineral species in the raised minerals i Of the percentage content, Indicates the mineral species in the mixed minerals i Of the percentage content, Indicates the percentage content of the drag minerals, Indicates the percentage content of the raised minerals, Indicates the percentage content of the mixed minerals, Indicates the number of mineral species in the drag minerals, Indicates the mineral species in the standard core, .

[0013] Combined with the sixth possible implementation manner of the first aspect, in the seventh possible implementation manner, the calculation method of the percentage content of each mineral in the drag minerals includes: ; Wherein, Indicates the percentage content of the mineral species i In the drag minerals, Indicates the percentage content of the drag minerals, Indicates the mineral species in the drag minerals; Indicates the mineral species iThe mineral percentage content, ; The calculation method of the percentage content of each mineral in the elevated minerals includes: ; Among them, represents the mineral type in the elevated minerals i of the percentage content, represents the percentage content of the elevated minerals, represents the mineral type in the elevated minerals i of the mineral percentage content, represents the mineral type, ; The calculation method of the percentage content of each mineral in the mixed minerals includes: ; Among them, represents the percentage content of each mineral in the mixed minerals.

[0014] Combined with the sixth possible implementation manner of the first aspect, in the eighth possible implementation manner, the reservoir storage capacity corresponding to the evaluation standard core includes: When , the reservoir storage capacity is classified as weak; when , the reservoir storage capacity is classified as medium; when , the reservoir storage capacity is classified as strong.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] The present invention proposes a new quantitative evaluation method for the storage capacity of tight gas reservoirs, which solves the technical problems in the prior art that the evaluation method for the storage capacity of the material basis of tight gas has high test costs and long test cycles, and it is difficult to accurately and quantitatively evaluate the storage capacity of tight gas reservoirs. This method classifies reservoir minerals based on the Young's modulus of the mechanical parameters of single minerals in rocks, calculates the percentage content of different types of minerals, and quantitatively calculates the storage capacity index to divide the storage capacity of the reservoir. The calculation process of this method is simple and feasible, has good adaptability to the oilfield, and at the same time greatly reduces the oilfield test funds, and has better application prospects and promotion value for similar tight gas reservoirs. By dividing the reservoir type through the storage capacity index and combining it with the dynamic development of reservoir stimulation, there is a qualitative improvement compared with the previous static evaluation of reservoir storage capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments of the present application or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Flow chart of a quantitative evaluation method for the reservoir storage capacity of a tight gas reservoir provided by an embodiment of the present application;

[0019] Figure 2 Comparison chart of the reservoir storage capacity indexes of the cores corresponding to the evaluation section of the tight gas reservoir provided by an embodiment of the present application. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Figure 1 It is a flow chart of a quantitative evaluation method for the reservoir storage capacity of a tight gas reservoir provided by an embodiment of the present application, including step S1 to step S5.

[0022] Step S1: Prepare a standard core based on rock samples and obtain the physical parameters of the standard core. Specifically, the physical parameters include the Young's modulus of the core, the types of minerals, and the Young's modulus and mineral percentage content of each type of mineral.

[0023] Step S2: Divide each type of mineral in the standard core into drag minerals, boosting minerals, and mixed minerals according to the physical parameters. Specifically, minerals with a Young's modulus lower than that of the core are classified as drag minerals. Minerals with a Young's modulus higher than that of the core are classified as boosting minerals. The mixed part of the boosting minerals and the drag minerals is classified as mixed minerals.

[0024] Step S3: Determine the ultimate Young's modulus of the drag minerals and the ultimate Young's modulus of the boosting minerals according to the physical parameters.

[0025] Step S4: Determine the percentage content of the drag minerals, the boosting minerals, and the mixed minerals in the standard core respectively according to the ultimate Young's modulus of the drag minerals and the ultimate Young's modulus of the boosting minerals in combination with the physical parameters, and obtain the percentage content of the drag minerals, the percentage content of the boosting minerals, and the percentage content of the mixed minerals.

[0026] Step S5: Determine the reservoir storage capacity index of the standard core based on the percentage content of the drag minerals, the percentage content of the boosting minerals, and the percentage content of the mixed minerals, so as to evaluate the reservoir storage capacity of the reservoir corresponding to the standard core.

[0027] In the embodiments of the present application, by classifying reservoir minerals based on the Young's modulus, a single-mineral physical parameter of rocks, and further calculating the percentage content of different types of minerals, the reservoir capacity index can be quantitatively calculated. By using the reservoir capacity index to divide the reservoir capacity of the reservoir and combining it with the dynamic development of reservoir stimulation, the adaptability of the quantitative method for improving the reservoir capacity of tight gas reservoirs to the oilfield can be enhanced, solving the problems that the traditional quantitative method for the reservoir capacity of tight gas reservoirs takes a long time and consumes a large amount of resources for oilfield testing, and achieving a qualitative improvement compared with the previous static evaluation of reservoir capacity.

[0028] Specifically, taking the WY area, the main development area of a tight gas reservoir, as an example, the process of quantitatively evaluating the reservoir capacity of the tight gas reservoir in the WY area is realized.

[0029] In the WY area, horizontal well volume fracturing is adopted. Therefore, the reservoir quality and classification in the WY area are crucial for the selection of fracturing sections and production capacity prediction.

[0030] Among them, Well WY1 is a water well in the WY area. The horizontal section of Well WY1 is 1500 m long, and the designed fracturing is 20 sections. Taking the three sections of WY1-WY3 as an example, a quantitative evaluation method for the reservoir capacity of a tight gas reservoir provided by the embodiments of the present application is used to quantitatively evaluate the reservoir types of these three sections of WY1-WY3. The specific quantitative evaluation process is as shown in Steps S1-S5 provided by the embodiments of the present application. Among them, Step S1 includes Sub-steps 101-103.

[0031] Step 101: Prepare standard cores based on rock samples: For the sections of WY1-WY3, one rock sample is obtained for each section, a total of three rock samples, and the rock samples are prepared into standard cylindrical cores with a height of 5 cm and a bottom diameter of 2.5 cm. The standard core of the WY1 section is denoted as Q1, the standard core of the WY2 section is denoted as Q2, and the standard core of the WY3 section is denoted as Q3.

[0032] Step 102: Use an X-ray diffractometer or other microscopic measurement methods to conduct experiments on the standard cores Q1, Q2, and Q3 respectively to obtain the types of minerals in the three standard cores and the percentage content of the minerals in the standard cores. The results are shown in Table 1. It should be noted that the percentage content of the minerals here refers to the percentage of the mineral in the standard core.

[0033] Table 1

[0034]

[0035] Step 103: Obtain the core Young's modulus of three sections of standard cores and the mineral Young's moduli of various minerals in the standard cores. In the embodiment of the present application, the numerical values of the Young's moduli of the three sections of standard cores obtained are shown in Table 1, and the mineral Young's moduli of various minerals in the standard cores obtained are shown in Table 2.

[0036] Table 2

[0037]

[0038] It should be noted that in the embodiment of the present application, the core Young's modulus and the mineral Young's modulus are obtained through a triaxial rock mechanics test system.

[0039] Step S2: Classify the minerals with a mineral Young's modulus lower than the core Young's modulus as drag minerals. Classify the minerals with a mineral Young's modulus higher than the core Young's modulus as boosting minerals. Classify the mixed part of the boosting minerals and the drag minerals as mixed minerals.

[0040] In the embodiment of the present application, the drag minerals include feldspar and clay minerals. The boosting minerals include quartz, calcite, and dolomite. The mixed minerals include feldspar, clay minerals, quartz, calcite, and dolomite.

[0041] Step S3: Calculate the ultimate Young's modulus of the drag minerals and the ultimate Young's modulus of the boosting minerals according to the physical parameters respectively.

[0042] Among them, the ultimate Young's modulus of the drag minerals represents the sum of the mineral Young's moduli of all minerals in the drag minerals. The ultimate Young's modulus of the boosting minerals represents the sum of the mineral Young's moduli of all minerals in the boosting minerals.

[0043] Specifically, the calculation formula for the ultimate Young's modulus of the drag minerals is as follows:

[0044] .

[0045] Among them, represents the ultimate Young's modulus of the drag minerals, represents the number of types of minerals in the drag minerals, represents the mineral type in the drag minerals i of the mineral percentage content; represents the mineral type in the drag minerals i of the mineral Young's modulus, .

[0046] Substitute the numerical values in Table 1 and Table 2 into the above formula for calculation to obtain the ultimate Young's modulus of the drag minerals, as shown in Table 3.

[0047] The calculation process of the ultimate Young's modulus of the boosting minerals is as follows:

[0048] .

[0049] Among them, represents the ultimate Young's modulus of the enhanced minerals, represents the number of mineral species in the standard core, represents the mineral species in the enhanced minerals i by mass percentage of the minerals, represents the mineral species in the enhanced minerals i Young's modulus of the minerals, .

[0050] Substitute the values in Table 1 and Table 2 into the calculation process of the ultimate Young's modulus of the enhanced minerals for calculation, and the ultimate Young's modulus of the enhanced minerals is obtained, as shown in Table 3.

[0051] Table 3

[0052]

[0053] Step 4: Based on the ultimate Young's modulus of the drag minerals and the ultimate Young's modulus of the enhanced minerals, combine the physical parameters to determine the mass percentages of the drag minerals, enhanced minerals, and mixed minerals in the standard core respectively, and obtain the mass percentage of the drag minerals, the mass percentage of the enhanced minerals, and the mass percentage of the mixed minerals.

[0054] The more average the values of the mass percentage of the drag minerals, the mass percentage of the enhanced minerals, and the mass percentage of the mixed minerals are, the better the reservoir homogeneity is and the better the reservoir capacity is. The calculation process needs to combine the ultimate Young's modulus obtained from Table 3 and the Young's modulus of the actually measured standard core obtained from Table 2 for calculation. The specific calculation process is as follows:

[0055] The calculation method of the mass percentage of the drag minerals includes:

[0056] .

[0057] Among them, represents the mass percentage of the drag minerals in the standard core, represents the Young's modulus of the standard core, .

[0058] The calculation method of the mass percentage of the enhanced minerals includes:

[0059] .

[0060] Among them, represents the mass percentage of the enhanced minerals, .

[0061] The calculation method of the mass percentage of the mixed minerals includes:

[0062] 。

[0063] Among them, represents the percentage content of the mixed minerals in the standard core, 。

[0064] In summary, the percentage content of the drag minerals, the percentage content of the boosting minerals, and the percentage content of the mixed minerals are calculated, and the results are shown in Table 4.

[0065] Table 4

[0066]

[0067] Step 5: Determine the reservoir capacity index of the standard core based on the percentage content of the drag minerals, the percentage content of the boosting minerals, and the percentage content of the mixed minerals, so as to evaluate the reservoir capacity of the reservoir corresponding to the standard core. Specifically, it includes:

[0068] Step 501: Calculate the percentage content of each mineral in the drag minerals, the boosting minerals, and the mixed minerals. The specific calculation process is as follows:

[0069] The calculation process of the percentage content of each mineral in the drag minerals includes:

[0070] 。

[0071] Among them, the type of mineral in the drag minerals i percentage content, 。

[0072] The calculation process of the percentage content of each mineral in the boosting minerals includes:

[0073] 。

[0074] Among them, represents the type of mineral in the boosting minerals i percentage content, 。

[0075] The calculation process of the percentage content of each mineral in the mixed minerals includes:

[0076] 。

[0077] That is:

[0078] 。

[0079] Among them, represents the type of mineral in the mixed minerals i percentage content.

[0080] It should be noted that it is necessary to distinguish the mineral percentage content of the minerals in the standard core obtained in step 102 and the , and obtained in step 501. The mineral percentage content obtained in step 102 is the percentage content of the minerals in the whole standard core. While the , and respectively represent the percentage content of the minerals in the standard core in the drag minerals, the percentage content of the minerals in the standard core in the boosting minerals, and the percentage content of the minerals in the standard core in the mixed minerals.

[0081] Substitute the data in Table 1 and Table 4 into the above three formulas for calculation to obtain the percentage content of each mineral in the drag minerals, boosting minerals, and mixed minerals in the standard core. As shown in Table 5.

[0082] Table 5

[0083]

[0084] Taking the standard core Q1 in Table 5 as an example, among them, the percentage content of feldspar in the drag minerals is 14%, and the percentage content of feldspar in the mixed minerals is 8%. Therefore, in the standard core Q1, the proportion of feldspar in the whole standard core Q1 is 22%, which is the same as the value (22%) of the percentage content of feldspar in the standard core in Table 1.

[0085] Step 502: Calculate the reservoir capacity index of the standard core. By substituting the data in Tables 1 to 5 into the following formula, the reservoir capacity indexes of the standard core Q1, standard core Q2, and standard core Q3 are obtained.

[0086] .

[0087] Among them, represents the reservoir capacity index of the standard core.

[0088] Specifically, the reservoir capacity indexes of the standard core Q1, standard core Q2, and standard core Q3 are shown in Table 5. The reservoir capacity index of the standard core Q1 = 0.88, the reservoir capacity index of the standard core Q2 = 0.84, and the reservoir capacity index of the standard core Q3 = 0.84.

[0089] Step 503: Based on the reservoir capacity index, evaluate the reservoir capacity of the reservoir corresponding to the standard core and divide the reservoir capacity of the reservoir corresponding to the standard core.

[0090] Step 503: Evaluate the reservoir capacity of the reservoir corresponding to the standard core based on the reservoir capacity index.

[0091] Specifically, based on the reservoir capacity index obtained in step 502 , the reservoirs corresponding to the standard cores Q1, Q2, and Q3 are evaluated for reservoir capacity.

[0092] When , the reservoir capacity of the reservoir is classified as weak.

[0093] When , the reservoir capacity of the reservoir is classified as medium.

[0094] When , the reservoir capacity of the reservoir is classified as strong.

[0095] It should be noted that in the embodiments of the present application, the reservoirs are also classified based on the reservoir capacity index, specifically as follows:

[0096] When , it is determined that the reservoir capacity is Class III, and the reservoir corresponding to the standard core is determined to be a low-level developable reservoir.

[0097] When , it is determined that the reservoir capacity is Class II, and the reservoir corresponding to the standard core is determined to be a medium-level developable reservoir.

[0098] When , it is determined that the reservoir capacity is Class I, and the reservoir corresponding to the standard core is determined to be a high-level developable reservoir.

[0099] In the embodiments of the present application, the reservoir types corresponding to the standard cores Q1, Q2, and Q3 are Class I, and the reservoir qualities are generally equivalent, being high-level developable reservoirs that require key strengthening and transformation.

[0100] It should be noted that a quantitative evaluation method for the reservoir capacity of a tight gas reservoir provided by the present application further includes combining the calculated reservoir capacity index with the dynamic development of reservoir transformation to guide the exploration and development of tight gas reservoirs.

[0101] Although the present application provides method operation steps as described in the embodiments or flowcharts, based on routine or non-creative labor, there may be more or fewer operation steps. The step order listed in this embodiment is only one way among many step execution orders and does not represent the only execution order. When actually executed by a device or client product, it can be executed in the order of the method shown in this embodiment or the drawings or in parallel (for example, in an environment of parallel processors or multi-threaded processing).

[0102] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A quantitative evaluation method for storage capacity of tight gas reservoirs, characterized in that: include: Prepare a standard core based on the rock sample and obtain physical parameters of the standard core; wherein the physical parameters include Young's modulus of the core, mineral types, and Young's modulus and mineral percentage of each type of mineral; According to physical parameters, various minerals in standard cores are divided into drag minerals, pull-up minerals and mixed minerals; The limiting Young's modulus of the drag mineral and the limiting Young's modulus of the pull mineral are determined according to the physical parameters; wherein the calculation method of the limiting Young's modulus of the drag mineral includes: ;in, represents the limiting Young's modulus of the drag mineral, Indicates the number of mineral types in the drag mineral. Indicates the type of mineral in the drag mineral i The percentage of minerals expressed as the mineral species that are drag minerals i The percentage of standard core, Indicates the type of mineral in the drag mineral i Young's modulus of minerals, ; The calculation method of the limiting Young's modulus of the high-precision mineral includes: ;in, It indicates the limiting Young's modulus of the mineral. Indicates the number of mineral species in the standard core, Indicates the type of mineral in the pull-up mineral i The percentage of minerals, expressed as the mineral species belonging to the pull-up mineral i The percentage of standard core, Indicates the type of mineral in the pull-up mineral i Young's modulus of minerals, ; Based on the limiting Young's modulus of the drag mineral and the limiting Young's modulus of the pull-up mineral combined with the physical parameters, the percentage of the drag mineral, the pull-up mineral and the mixed mineral in the standard core are determined respectively, and the percentage of the drag mineral, the pull-up mineral and the mixed mineral are obtained; The storage capacity index of the standard core is determined based on the percentage of drag minerals, the percentage of pull-up minerals and the percentage of mixed minerals to evaluate the storage capacity of the reservoir corresponding to the standard core.

2. The method according to claim 1, characterized in that The physical parameters of the standard core are obtained, including: Conduct microscopic measurement on the standard core to obtain the mineral types and percentage content of each mineral in the standard core; The Young's modulus of the standard core and the Young's modulus of various minerals are obtained by using the mechanical testing system.

3. The method according to claim 1, characterized in that The various minerals in the standard core are divided into drag minerals, pull-up minerals and mixed minerals according to physical parameters, including: Classify various minerals in the standard core according to their Young's modulus and the Young's modulus of the core; Minerals with Young's modulus lower than that of the core are classified as drag minerals; Minerals with Young's modulus higher than that of the core are classified as pull-up minerals; The mixed part of the pull-up minerals and the drag-down minerals is classified as mixed minerals.

4. The method according to claim 1, characterized in that: The method for calculating the percentage of drag minerals includes: ； in, Indicates the percentage of drag minerals, represents the Young's modulus of the core, represents the limiting Young's modulus of the drag mineral, Indicates the number of mineral species in the drag mineral; Indicates the type of mineral in the drag mineral i The mineral percentage of The calculation method of the percentage of the raised mineral includes: ； in, It means to increase the percentage of minerals. It indicates the limiting Young's modulus of the mineral. Indicates the number of mineral species in the standard core, Indicates the type of mineral in the pull-up mineral i The mineral percentage of The calculation method of the percentage of mixed minerals includes: ； in, Indicates the percentage of mixed minerals. .

5. The method according to claim 1, characterized in that The calculation method of the storage capacity index includes: ； in, represents the storage capacity index of the standard core, Indicates the type of mineral in the drag mineral i The percentage content, which is expressed as the mineral type in the drag mineral i The percentage of the standard core; Indicates the type of mineral in the pull-up mineral i The percentage content, which is expressed as the mineral type in the pull-up mineral i The percentage of the standard core; Indicates the mineral types in the mixed mineral i The percentage content, which is expressed as the mineral type in the mixed mineral i The percentage of the standard core; Indicates the percentage of drag minerals, It means to increase the percentage of minerals. Indicates the percentage of mixed minerals. Indicates the number of mineral types in the drag mineral. Indicates the number of mineral species in the standard core, .

6. The method according to claim 5, characterized in that The above indicates the type of mineral in the drag mineral i The calculation method of percentage content includes: ； in, Indicates the type of mineral in the drag mineral i The percentage content, which is expressed as the mineral type in the drag mineral i The percentage of standard core, Indicates the percentage of drag minerals, Indicates the number of mineral species in the drag mineral; Indicates the type of mineral in the drag mineral i The mineral percentage of The calculation method of the percentage content of each mineral in the pull-up mineral includes: ； in, Indicates the type of mineral in the pull-up mineral i The percentage content, which is expressed as the mineral type in the pull-up mineral i The percentage of standard core, It means to increase the percentage of minerals. Indicates the type of mineral in the pull-up mineral i The mineral content, Indicates the number of mineral species; The mineral types in the mixed minerals i The calculation method of percentage content includes: ； in, Indicates the percentage of each mineral in the mixed mineral, which is expressed as the mineral type in the mixed mineral i The percentage of standard core, .

7. The method according to claim 5, characterized in that The storage capacity of the reservoir corresponding to the evaluation standard core includes: when When , the storage capacity of the reservoir is classified as weak; when When , the storage capacity of the reservoir is classified as medium; when When , the storage capacity of the reservoir is classified as strong.

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