Quantitative evaluation method and device for penetrating performance of natural crack and computer equipment

Abstract

The invention relates to a quantitative evaluation method and device for penetrating performance of natural fractures, computer equipment and a storage medium. The method comprises the following steps: acquiring a target geological profile image containing a natural fracture; identifying a target geological profile image to obtain a natural fracture layer penetrating property parameter set; according to the natural fracture linear density, the layer penetrating number of each natural fracture and the layer penetrating thickness, a first natural fracture layer penetrating performance evaluation factor is set; setting a second natural fracture crossing evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density; and constructing a natural fracture crossing evaluation index based on the first natural fracture crossing evaluation factor and the second natural fracture crossing evaluation factor, and carrying out quantitative evaluation on the natural fracture crossing according to the fact that the natural fracture crossing evaluation index is in direct proportion to the natural fracture crossing. By adopting the method, multiple factors can be comprehensively considered, and quantitative evaluation of the natural fracture crossing performance is realized.

Description

Technical Field

[0001] The present application relates to the fields of petroleum and natural gas geology and coal-bearing gas geology, and in particular to a method, device, computer equipment and storage medium for quantitatively evaluating the penetration of natural fractures. Background Art

[0002] In the field of oil and gas geology and coal-measure gas geology, natural fractures are crucial to exploration and development. The parameters that quantitatively characterize natural fractures include: fracture occurrence, fracture aperture, fracture filling and filling materials, fracture density, fracture penetration, etc. At present, there are different methods to achieve quantitative evaluation and prediction of parameters such as fracture density and fracture occurrence, but in terms of fracture penetration, most of them only use the number of strata penetrated by the fracture as an evaluation and prediction indicator. This method has the disadvantages of incomplete consideration of factors and lack of scientificity.

[0003] Although there have been many studies on "fracture penetration", they mainly focus on the evaluation of fracture penetration during the fracturing process. It is different from the natural fractures formed mainly under the action of tectonic stress in the ancient geological history. There is currently no quantitative research on the penetration of natural fractures. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment and storage medium for quantitatively evaluating the penetration of natural fractures with comprehensive consideration of factors and high credibility of results in response to the above technical problems.

[0005] In a first aspect, the present application provides a method for quantitatively evaluating the penetration of natural fractures, comprising:

[0006] Step 1, obtaining a target geological profile image containing natural fractures;

[0007] Step 2, identifying the target geological profile image to obtain a natural fracture penetration parameter set, wherein the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number of penetration layers and the penetration thickness of each natural fracture, and the total number of all natural fracture endpoints;

[0008] Step 3, setting a first natural fracture penetration evaluation factor according to the natural fracture line density, the number of layers penetrated by each natural fracture, and the penetration thickness;

[0009] Step 4, setting a second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density;

[0010] Step 5, constructing a natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, and quantitatively evaluating the natural fracture penetration according to the fact that the natural fracture penetration evaluation index is proportional to the natural fracture penetration.

[0011] In one embodiment, step 1 includes:

[0012] Determine the geological section of the natural fracture penetration to be evaluated, place a scale, and take images to obtain the target geological section image containing the natural fracture.

[0013] In one embodiment, step 2 includes:

[0014] According to the target geological profile image containing natural fractures, the natural fractures and rock formation boundaries developed in the geological profile of the natural fracture penetration to be evaluated are identified, and based on the target number of natural fractures and the survey lines of the specified direction, the natural fracture penetration parameter set is calculated to obtain the natural fracture penetration parameter set, where the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number and thickness of each natural fracture penetration layer, and the total number of all natural fracture endpoints.

[0015] In one embodiment, the linear density of natural fractures in step 2 is calculated using formula (1), and the surface density of natural fractures in step 2 is calculated using formula (2), including:

[0016]

[0017] Among them, F l is the density of natural fracture lines, m is the number of natural fractures that the survey line passes through, L is the length of the survey line, and F a is the surface density of natural fractures, l is the length of the ith natural fracture, and S is the geological section area of ​​the natural fracture penetration to be evaluated.

[0018] In one embodiment, step 3 includes:

[0019] Based on the definition of the natural fracture penetration parameter set and the calculation of the first natural fracture penetration evaluation factor A according to formula (3):

[0020]

[0021] Where n is the number of layers penetrated by the i-th natural fracture, h is the thickness of the layer penetrated by the i-th natural fracture, and F l is the density of natural fracture lines.

[0022] In one embodiment, step 4 includes:

[0023] Based on the definition of the natural fracture penetration parameter set and the calculation of the second natural fracture penetration evaluation factor B according to formula (4):

[0024]

[0025] Where N is the total number of all natural fracture endpoints in the geological section to be evaluated for natural fracture penetration, F ais the surface density of natural fractures.

[0026] In one embodiment, step 5 includes:

[0027] The natural fracture penetration evaluation index F is constructed based on the first natural fracture penetration evaluation factor A and the second natural fracture penetration evaluation factor B. The construction method is shown in formula (5):

[0028]

[0029] Among them, the value of the natural fracture penetration evaluation index F is proportional to the natural fracture penetration.

[0030] In a second aspect, the present application also provides a device for quantitatively evaluating the penetration of natural fractures, including:

[0031] A geological profile image acquisition module, used to acquire a target geological profile image containing natural fractures;

[0032] A layer penetration parameter set acquisition module is used to identify the target geological profile image to obtain a natural fracture layer penetration parameter set, wherein the natural fracture layer penetration parameter set includes the natural fracture line density and surface density, the number of layers and thickness of each natural fracture, and the total number of all natural fracture endpoints;

[0033] A first natural fracture penetration evaluation factor determination module, used for setting the first natural fracture penetration evaluation factor according to the natural fracture line density, the number of penetration layers of each natural fracture and the penetration thickness;

[0034] A second natural fracture penetration evaluation factor determination module, used for setting the second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density;

[0035] The module for determining the natural fracture penetration evaluation index is used to construct the natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, and to quantitatively evaluate the natural fracture penetration according to the fact that the natural fracture penetration evaluation index is proportional to the natural fracture penetration.

[0036] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method for quantitatively evaluating the permeability of natural fractures provided in the first aspect are implemented.

[0037] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for quantitatively evaluating the permeability of natural fractures provided in the first aspect below.

[0038] The above-mentioned natural fracture penetration quantitative evaluation method, device, computer equipment and storage medium obtain a target geological profile image containing natural fractures through geological survey and image shooting; identify the target geological profile image to obtain a natural fracture penetration parameter set, wherein the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number of penetration layers and the penetration thickness of each natural fracture, and the total number of all natural fracture endpoints; set a first natural fracture penetration evaluation factor according to the natural fracture line density, the number of penetration layers and the penetration thickness of each natural fracture; set a second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density; construct a natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, quantitatively evaluate the natural fracture penetration according to the natural fracture penetration evaluation index being proportional to the natural fracture penetration, comprehensively consider the natural fracture line density, surface density, the number of penetration layers, the penetration thickness and the number of endpoints, construct a natural fracture penetration evaluation index, and achieve the goal of quantitatively evaluating the natural fracture penetration. This method takes all factors into consideration, has a rigorous calculation process, strong operability, and highly credible evaluation results, filling the gap in the research on quantitative evaluation of natural fracture penetration. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention and the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of a process for quantitatively evaluating the penetration of natural fractures in one embodiment;

[0041] FIG2 is a schematic diagram of calculating a first natural fracture penetration evaluation factor in one embodiment;

[0042] FIG3 is a schematic diagram of calculating a second natural fracture penetration evaluation factor in one embodiment;

[0043] Figure 4 A schematic diagram of a flow chart of a method for quantitatively evaluating the penetration of natural fractures in another embodiment;

[0044] Figure 5 It is an example calculation diagram of a method for quantitatively evaluating the penetration of natural fractures in one embodiment;

[0045] Figure 6 Schematic diagram of a module of a device for quantitatively evaluating the penetration of natural fractures in one embodiment. DETAILED DESCRIPTION

[0046] Natural fractures can significantly increase reservoir permeability, facilitating the flow and extraction of oil, gas or coal-bearing gas. Natural fracture research helps optimize drilling locations, increase recovery, and reduce development costs. In addition, the distribution and characteristics of natural fractures also affect reservoir management and production strategies.

[0047] There are many traditional studies on the penetration of cracks. Some methods first obtain the thickness and horizontal minimum principal stress of sandstone and mudstone in different layers; then obtain rock mechanics parameters and calculate the interface strength of sandstone and mudstone interlayers; finally, combine the relevant parameters affecting the longitudinal penetration characteristics of sandstone and mudstone interlayer cracks to simulate and evaluate the longitudinal penetration ability of the sandstone and mudstone interlayer cracks to be analyzed; some methods construct a penetration ability judgment matrix based on multiple preset factors, determine the maximum eigenvector of the penetration ability judgment matrix, normalize the maximum eigenvector, determine the weight values ​​of each component of the maximum eigenvector, and normalize multiple preset factors according to the preset processing model. The result values ​​of the normalization processing of each preset factor are obtained, and a penetration ability judgment model is generated according to the weight value of each component and the result value of the normalization processing of each preset factor. The penetration ability of the shale oil reservoir fracture height is evaluated through the penetration ability judgment model; some methods input the single well core fracture data, electrical imaging logging data and image data in the target area, and carry out the target layer lithology and natural fracture identification based on the core homing. Based on the identification results, the single sandstone thickness of the target layer, the fracture penetration, and the longitudinal extension length of the fracture are statistically analyzed, and the various fracture parameters are coupled to construct the natural fracture matching division interval, establish the natural fracture space matching mode of the whole well section of tight sandstone, and clarify the distribution characteristics.

[0048] However, the existing studies on "fracture penetration" mentioned above mainly focus on the evaluation of fracture penetration during the fracturing process, which is different from the natural fractures formed mainly under the action of tectonic stress in the ancient geological history. There is currently no quantitative study on the penetration of natural fractures.

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] In an exemplary embodiment, Figure 1 As shown, a method for quantitatively evaluating the penetration of natural fractures is provided, including:

[0051] Step 1, obtaining a target geological profile image containing natural fractures;

[0052] Step 2, identifying the target geological profile image to obtain a natural fracture penetration parameter set, wherein the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number of penetration layers and the penetration thickness of each natural fracture, and the total number of all natural fracture endpoints;

[0053] Step 3, setting a first natural fracture penetration evaluation factor according to the natural fracture line density, the number of layers penetrated by each natural fracture, and the penetration thickness;

[0054] Step 4, setting a second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density;

[0055] Step 5, constructing a natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, and quantitatively evaluating the natural fracture penetration according to the fact that the natural fracture penetration evaluation index is proportional to the natural fracture penetration.

[0056] In the above-mentioned quantitative evaluation method of natural fracture penetration, the geological profile of natural fracture penetration to be evaluated is determined through geological survey, the target geological profile image containing natural fractures is obtained, and the target geological profile image is identified to obtain the natural fracture penetration parameter set, wherein the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number of layers and thickness of each natural fracture, and the total number of all natural fracture endpoints; the first natural fracture penetration evaluation factor A is defined and calculated, which is a function of the number of layers, thickness and line density of natural fractures in the profile; the second natural fracture penetration evaluation factor B is defined and calculated, which is a function of the number of natural fracture endpoints and surface density of natural fractures; based on the natural fracture penetration evaluation factors A and B, the natural fracture penetration evaluation index F is constructed, that is, the ratio of A to B, and then the natural fracture penetration can be quantitatively evaluated. This method comprehensively considers factors such as the degree of development of natural fractures, the number of layers and thickness of natural fractures, and has a rigorous calculation process, strong operability, and high credibility of the evaluation results.

[0057] In an exemplary embodiment, step 1 includes determining a geological section of the natural fracture penetration to be evaluated, placing a scale, and taking an image to obtain a target geological section image containing natural fractures.

[0058] Specifically, through field geological surveys, the geological profile of the natural fracture penetration to be evaluated is determined, a scale is placed, and panoramic high-definition photos are taken to obtain the target geological profile image containing the natural fracture.

[0059] In this embodiment, the geological profile of the natural fracture penetration to be evaluated is determined and a panoramic high-definition photo is taken to provide a basis for obtaining the natural fracture penetration parameters.

[0060] In an exemplary embodiment, step 2 includes identifying the natural fractures and stratum boundaries developed in the geological profile whose natural fracture penetration is to be evaluated based on the target geological profile image containing the natural fractures, and setting the target number and the survey line of the specified direction based on the natural fractures, and calculating the natural fracture penetration parameter set, wherein the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number of penetration layers and the penetration thickness of each natural fracture, and the total number of all natural fracture endpoints.

[0061] Specifically, based on photographs and field sites, the natural fractures and stratum boundaries developed in the profile are identified, and the linear and surface densities of natural fractures, the number and thickness of interlayers penetrated by each natural fracture, and the total number of all natural fracture endpoints are calculated.

[0062] According to the classification scheme of Manzocchi (2002), natural fracture endpoints can be divided into isolated type I, crossed type X, and truncated type Y. In this embodiment, the natural fracture endpoints refer only to the type I natural fracture endpoints, and the total number of natural fracture endpoints mainly refers to the total number of type I fracture endpoints, excluding the intersections of X-type or Y-type natural fractures.

[0063] Exemplarily, according to the distribution of natural fractures in the target geological profile image, side lines of different directions and numbers are set to obtain parameters such as natural fracture line density.

[0064] In this embodiment, the linear density and surface density of natural fractures, the number of layers penetrated and the thickness of each natural fracture, and the total number of endpoints of all natural fractures are obtained based on photos and field calculations, providing data support for defining and constructing natural fracture penetration evaluation factors and natural fracture penetration evaluation indicators.

[0065] In an exemplary embodiment, the natural fracture linear density in step 2 is calculated using formula (1), and the natural fracture surface density in step 2 is calculated using formula (2), including:

[0066]

[0067] Where m is the number of natural fractures that the survey line passes through, L is the length of the survey line, and F l It is the density of natural fracture lines, which can be calculated by taking multiple measuring lines and taking the average value.

[0068]

[0069] Among them, F a is the surface density of natural fractures, l is the length of the ith natural fracture, and S is the geological section area of ​​the natural fracture penetration to be evaluated.

[0070] In this embodiment, the calculation method of the natural fracture line density and the natural fracture surface density is clarified to provide a data basis for calculating the natural fracture penetration evaluation factor and the natural fracture penetration evaluation index.

[0071] In an exemplary embodiment, step 3 includes:

[0072] Based on the definition of the natural fracture penetration parameter set and the calculation of the first natural fracture penetration evaluation factor A according to formula (3):

[0073]

[0074] Where n is the number of layers penetrated by the i-th natural fracture, h is the thickness of the layer penetrated by the i-th natural fracture, and F l is the natural fracture line density. Specifically, the larger the value of the first natural fracture penetration evaluation factor A is, the better the natural fracture penetration is.

[0075] For example, as shown in FIG2(a) and FIG2(b), including natural fracture 1, natural fracture 2, natural fracture 3 and rock layer 1, rock layer 2, rock layer 3, rock layer 4, the A value of FIG2(a) is calculated as shown in formula (6):

[0076]

[0077] The A value of Figure 2(b) is calculated as shown in formula (7):

[0078]

[0079] Among them, in Figure 2(a) and Figure 2(b), the length of MN is equal to M′N′. It can be seen that the A value of Figure 2(a) is higher than the A value of Figure 2(b). It can be seen from Figure 2(a), Figure 2(b) and the calculation results that the natural fracture in Figure 2(a) has stronger interlayer property.

[0080] In this embodiment, a first natural fracture penetration evaluation factor is defined based on the number of penetration layers, penetration thickness and natural fracture line density of the natural fracture, so as to evaluate the penetration of the natural fracture.

[0081] In an exemplary embodiment, step 4 includes:

[0082] Based on the definition of the natural fracture penetration parameter set and the calculation of the second natural fracture penetration evaluation factor B according to formula (4):

[0083]

[0084] Where N is the total number of all natural fracture endpoints in the geological section to be evaluated for natural fracture penetration, F ais the natural fracture surface density. Specifically, the larger the value of the second natural fracture penetration evaluation factor B is, the worse the natural fracture penetration is.

[0085] For example, as shown in FIG3(a) and FIG3(b), including natural fracture 1, natural fracture 2, natural fracture 3 and rock layer 1, rock layer 2, rock layer 3, rock layer 4, the B value of FIG3(a) is calculated as shown in formula (8):

[0086]

[0087] The B value of Figure 3(b) is calculated as shown in formula (9):

[0088]

[0089] Where p and q are the length and width of the observation area shown in Figure 3(a) and Figure 3(b), respectively. It can be seen from Figure 3(a), Figure 3(b) and the calculation results that the B value in Figure 3(b) is large and the penetration of the natural fracture is worse.

[0090] In this embodiment, a second natural fracture penetration evaluation factor is defined based on the total number of all natural fracture endpoints and the natural fracture surface density in the geological profile of the natural fracture penetration to be evaluated, so as to evaluate the natural fracture penetration.

[0091] In an exemplary embodiment, step 5 includes:

[0092] The natural fracture penetration evaluation index F is constructed based on the first natural fracture penetration evaluation factor A and the second natural fracture penetration evaluation factor B. The construction method is shown in formula (5):

[0093]

[0094] Among them, the value of the natural fracture penetration evaluation index F is proportional to the natural fracture penetration. The larger the value, the better the natural fracture penetration.

[0095] In this embodiment, the linear density, surface density, number of interlayers, interlayer thickness and number of endpoints of natural fractures are comprehensively considered to construct an evaluation index for interlayer properties of natural fractures, thereby achieving the goal of quantitatively evaluating the interlayer properties of natural fractures.

[0096] In an exemplary embodiment, Figure 4 As shown in the figure, a quantitative evaluation method for natural fracture penetration is provided. First, the geological section of natural fracture penetration to be evaluated is determined, that is, a panoramic high-definition photo is taken to identify the natural fractures and rock formation boundaries developed in the section, and the number of layers and thickness of each natural fracture as well as the natural fracture line density are calculated, and then the natural fracture penetration evaluation factor A is obtained, where Calculate the surface density of natural fractures and the total number of all natural fracture endpoints to obtain the natural fracture penetration evaluation factor B, where Furthermore, the natural fracture penetration evaluation index F is calculated, where The penetration of natural fractures is quantitatively evaluated based on the natural fracture penetration evaluation index F.

[0097] In an exemplary embodiment, Figure 5 As shown in the figure, the evaluation process of this method is further explained by taking photos actually taken in the wild as an example:

[0098] To be more objective, survey lines are taken in the five layers, namely, survey lines 1, 2, 3, 4 and 5 are taken in layers 1, 2, 3, 4 and 5, and the natural fracture line density of each survey line is calculated. The average value is taken as the natural fracture line density in the rectangular frame. The calculation method is shown in formula (10):

[0099]

[0100] The calculation method of natural fracture surface density in the rectangular frame is shown in formula (11):

[0101]

[0102] The calculation method of the A value in the rectangular frame is shown in formula (12):

[0103]

[0104] The calculation method of the B value in the rectangular frame is shown in formula (13):

[0105]

[0106] The calculation method of the natural crack penetration evaluation index F in the rectangular frame is shown in formula (14):

[0107]

[0108] In this embodiment, the natural fracture penetration evaluation index value obtained according to the natural fracture penetration quantitative evaluation method is 0.0866.

[0109] Unless otherwise clearly stated in this document, the steps in the flowcharts involved in the above embodiments may be executed in other orders, wherein at least part of the steps may include multiple steps or multiple stages, which may be executed at different times, or may be executed in turn or alternation with other steps or at least part of the steps or stages in other steps.

[0110] Based on the same inventive concept, the embodiment of the present application also provides a natural fracture penetration quantitative evaluation device for implementing the above-mentioned natural fracture penetration quantitative evaluation method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more natural fracture penetration quantitative evaluation device embodiments provided below can refer to the limitations of the natural fracture penetration quantitative evaluation method above, and will not be repeated here.

[0111] In an exemplary embodiment, Figure 6 As shown, a device for quantitatively evaluating the penetration of natural fractures is provided, comprising:

[0112] A geological profile image acquisition module 601 is used to acquire a target geological profile image containing natural fractures;

[0113] The layer penetration parameter set acquisition module 602 is used to identify the target geological profile image to obtain the natural fracture layer penetration parameter set, wherein the natural fracture layer penetration parameter set includes the natural fracture line density and surface density, the number of layers and thickness of each natural fracture, and the total number of all natural fracture endpoints;

[0114] A first natural fracture penetration evaluation factor determination module 603 is used to set the first natural fracture penetration evaluation factor according to the natural fracture line density, the number of penetration layers of each natural fracture and the penetration thickness;

[0115] A second natural fracture penetration evaluation factor determination module 604 is used to set a second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density;

[0116] The natural fracture penetration evaluation index determination module 605 is used to construct a natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, and to quantitatively evaluate the natural fracture penetration according to the fact that the natural fracture penetration evaluation index is proportional to the natural fracture penetration.

[0117] Each module in the above-mentioned natural fracture penetration quantitative evaluation device can be implemented in whole or in part by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0118] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0119] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0120] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for quantitatively evaluating the penetration of natural fractures, characterized in that: The method comprises: Step 1, obtaining a target geological profile image containing natural fractures; Step 2, identifying the target geological profile image to obtain a natural fracture penetration parameter set, wherein the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number of penetration layers and the penetration thickness of each natural fracture, and the total number of all natural fracture endpoints; Step 3, setting a first natural fracture penetration evaluation factor according to the natural fracture line density, the number of layers penetrated by each natural fracture, and the penetration thickness; Step 4, setting a second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density; Step 5, constructing a natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, and quantitatively evaluating the natural fracture penetration according to the fact that the natural fracture penetration evaluation index is proportional to the natural fracture penetration.

2. The method according to claim 1, characterized in that The step 1 comprises: Determine the geological section of the natural fracture penetration to be evaluated, place a scale, and take images to obtain the target geological section image containing the natural fracture.

3. The method according to claim 2, characterized in that The step 2 comprises: According to the target geological profile image containing natural fractures, the natural fractures and rock formation boundaries developed in the geological profile of the natural fracture penetration to be evaluated are identified, and based on the target number of natural fractures and the survey lines of the specified direction, the natural fracture penetration parameter set is calculated to obtain the natural fracture penetration parameter set, where the natural fracture penetration parameter set includes the natural fracture line density and surface density, the number and thickness of each natural fracture penetration layer, and the total number of all natural fracture endpoints.

4. The method according to claim 3, characterized in that The linear density of the natural fractures in step 2 is calculated using formula (1), and the surface density of the natural fractures in step 2 is calculated using formula (2), including: Among them, F l is the density of natural fracture lines, m is the number of natural fractures that the survey line passes through, L is the length of the survey line, and F a is the surface density of natural fractures, l is the length of the ith natural fracture, and S is the geological section area of ​​the natural fracture penetration to be evaluated.

5. The method according to claim 4, characterized in that The step 3 comprises: Based on the definition of the natural fracture penetration parameter set and the calculation of the first natural fracture penetration evaluation factor A according to formula (3): Where n is the number of layers penetrated by the i-th natural fracture, h is the thickness of the layer penetrated by the i-th natural fracture, and F l is the density of natural fracture lines.

6. The method according to claim 5, characterized in that The step 4 comprises: Based on the definition of the natural fracture penetration parameter set and the calculation of the second natural fracture penetration evaluation factor B according to formula (4): Where N is the total number of all natural fracture endpoints in the geological section to be evaluated for natural fracture penetration, F a is the surface density of natural fractures.

7. The method according to claim 6, characterized in that The step 5 comprises: The natural fracture penetration evaluation index F is constructed based on the first natural fracture penetration evaluation factor A and the second natural fracture penetration evaluation factor B. The construction method is shown in formula (5): Among them, the value of the natural fracture penetration evaluation index F is proportional to the natural fracture penetration.

8. A device for quantitatively evaluating the penetration of natural fractures, characterized in that: The device comprises: A geological profile image acquisition module, used to acquire a target geological profile image containing natural fractures; A layer penetration parameter set acquisition module is used to identify the target geological profile image to obtain a natural fracture layer penetration parameter set, wherein the natural fracture layer penetration parameter set includes the natural fracture line density and surface density, the number of layers and thickness of each natural fracture, and the total number of all natural fracture endpoints; A first natural fracture penetration evaluation factor determination module, used for setting the first natural fracture penetration evaluation factor according to the natural fracture line density, the number of penetration layers of each natural fracture and the penetration thickness; A second natural fracture penetration evaluation factor determination module, used for setting the second natural fracture penetration evaluation factor according to the total number of all natural fracture endpoints and the natural fracture surface density; The module for determining the natural fracture penetration evaluation index is used to construct the natural fracture penetration evaluation index based on the first natural fracture penetration evaluation factor and the second natural fracture penetration evaluation factor, and to quantitatively evaluate the natural fracture penetration according to the fact that the natural fracture penetration evaluation index is proportional to the natural fracture penetration.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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