A quantitative calculation method and system for effective fracture width based on core-logging

Abstract

The present invention relates to a method and system for quantitatively calculating effective crack width based on core logging, which comprises: first-level scanning of a core sample to determine whether there is a crack, and if so, experimentally measuring the crack width, and determining whether it is necessary to calculate the crack width; performing physical property experiments on multiple core samples to obtain first porosities and first permeabilities of the multiple core samples, and determining whether to perform a second-level scan according to the first permeability; performing a second-level scan to determine whether there is a crack, and if so, measuring the crack width, and determining whether it is necessary to calculate the crack width according to logging data; performing physical property experiments on multiple core samples including the core sample to obtain second porosities and second permeabilities of the multiple core samples, and determining whether to perform a second-level scan on the next core sample according to the second permeability; and determining whether a crack to be determined is an effective crack according to a conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation established in advance.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploration, and in particular to a method and system for quantitatively calculating effective fracture width based on core-logging. Background Art

[0002] As oil and gas exploration and development continue to develop towards deep and ultra-deep layers, fractured reservoirs have gradually become the main force for increasing reserves and production, among which fractures are the main channels for oil and gas seepage and an important factor in production capacity contribution. Quantitative characterization of fractures has always been the focus and difficulty of research in the industry. It has not yet been clarified which fractures in fractured reservoirs are similar to throats and only serve as seepage channels, and do not contribute to oil and gas production capacity; which fractures play a major role in the contribution to oil and gas production capacity; the key parameter to distinguish the above different types of fractures is the fracture width.

[0003] There are two major methods for quantitative calculation of fracture width: the first is to obtain fracture width through rock physics experimental measurement; CT scanning experiments on core samples of different sizes, such as full-diameter cores and plunger cores, can obtain accurate fracture widths. The second is to calculate fracture width through logging. Based on the principles and methods of acoustic / electric imaging logging, the fracture width of fractured reservoirs can be calculated by processing and interpreting acoustic / electric imaging logging images. However, there are differences in acoustic / electric imaging logging data collected by different types of logging instruments and different fracture width calculation methods, and there is a lack of systematic comparison with fracture widths measured in rock physics experiments. The fracture width calculated by logging has a large uncertainty. In addition, since the above two major methods do not establish a connection with the contribution of fractures to permeability, it is still impossible to clarify which fractures are similar to throats and only serve as seepage channels, and which fractures can play a major role in contributing to oil and gas production capacity.

[0004] The operating costs of deep and ultra-deep reservoirs are very high. Accurate evaluation of fractured reservoirs can not only significantly save operating costs, but also optimize well location deployment and the number of wells, thereby significantly improving economic benefits. Since it is not clear which fractures play a major role in the contribution of oil and gas production capacity, the industry has not yet formed an effective quantitative calculation method for fracture width. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a core-logging based effective fracture width quantitative calculation method and system, which can accurately calculate the width of effective fractures in fractured reservoirs in deep and ultra-deep layers.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for quantitatively calculating effective fracture width based on core-logging, comprising: performing a first-level scan on a core sample to determine whether there are fractures, and if there are fractures, experimentally measuring the fracture width, and judging whether it is necessary to calculate the fracture width according to the logging data; performing physical property experiments on a plurality of core samples including the core sample subjected to the first-level scan to measure the first porosity and the first permeability of the plurality of core samples, and judging whether to perform a second-level scan according to the first permeability; performing a first-level scan on the core sample without fractures and the core sample without logging data; The core sample for calculating the crack width is subjected to a second-level scan to determine whether there is a crack. If there is a crack, the crack width is experimentally measured, and it is determined whether the crack width needs to be calculated based on the logging data; physical property experiments are performed on multiple core samples including the core sample subjected to the second-level scan to obtain the second porosity and the second permeability of the multiple core samples, and it is determined whether the second-level scan is to be performed on the next core sample based on the second permeability; based on the pre-established conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation, it is determined whether the crack to be determined is a valid crack.

[0007] Further, the first level scanning of the core sample to determine whether there are cracks includes:

[0008] Obtaining a core sample at a preset depth of a fractured reservoir in a well of a certain oil and gas field, and performing a nano-CT scan on the core sample as the first-level scan;

[0009] If no cracks are found, the core sample is subjected to the second level scan.

[0010] Further, judging whether it is necessary to calculate the fracture width according to the well logging data includes:

[0011] If the acoustic / electric imaging logging data collected in the well show that there are no fractures, the second level scanning is performed on the core sample;

[0012] If the acoustic / electric imaging logging data collected in the well show the existence of fractures, the fracture width can be obtained by logging calculation.

[0013] Further, judging whether to perform a second level scan according to the first permeability includes:

[0014] If the first permeability of the core sample does not change significantly, performing the second level scanning on the core sample;

[0015] If the first permeability of the core sample changes significantly, the fracture width measured experimentally after the first level scanning of the core sample and the fracture width calculated by the acoustic / electric imaging logging are recorded and compared.

[0016] Further, the second level scan is a micrometer CT scan; the second level scan is performed to determine whether there is a crack, if there is a crack, the crack width is obtained by experimental measurement, and whether the crack width needs to be calculated according to the logging data, including:

[0017] If the acoustic / electric imaging logging data collected in the well show no fractures, continue to scan the next core sample for the second level;

[0018] If the acoustic / electric imaging logging data collected in the well show the existence of fractures, the fracture width can be obtained by logging calculation.

[0019] Further, judging whether to perform the second level scanning on the next core sample according to the second permeability includes:

[0020] If the second permeability of the core sample does not change significantly, continue to perform the second level scan on the next core sample;

[0021] If the second permeability of the core sample changes significantly, record and compare the fracture width experimentally measured after the second level scanning of the core sample and the fracture width calculated by the acoustic / electric imaging logging.

[0022] Further, judging whether the crack to be determined is a valid crack according to the conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation, includes:

[0023] If there is a crack width measured experimentally in a core sample, determine whether the measured crack width is greater than the measured crack width of the sample. If so, it is an effective crack.

[0024] If there is no core sample experimental measurement of fracture width, but there is fracture width calculated by logging, then determine whether the fracture width calculated by logging is greater than the fracture width calculated by acoustic / electric imaging logging and greater than the fracture width calculated by logging of the sample. If so, it is an effective fracture.

[0025] A quantitative calculation system for effective fracture width based on core-logging, comprising: a primary scanning module, which performs a primary scanning on a core sample to determine whether there are fractures, and if there are fractures, the fracture width is obtained by experimental measurement, and whether the fracture width needs to be calculated is determined according to the logging data; a first judgment module, which performs a physical property experiment on a plurality of core samples including the core sample subjected to the primary scanning, measures the first porosity and the first permeability of the plurality of core samples, and determines whether a secondary scanning is performed according to the first permeability; a secondary scanning module, which performs a primary scanning on the core sample without fractures in the primary scanning and the core sample without calculating the fractures; The core sample with the second-level width is subjected to the second-level scanning to determine whether there is a crack. If there is a crack, the crack width is experimentally measured, and it is determined whether the crack width needs to be calculated according to the logging data; the second judgment module performs physical property experiments on multiple core samples including the core sample subjected to the second-level scanning, measures the second porosity and the second permeability of the multiple core samples, and determines whether to perform the second-level scanning on the next core sample according to the second permeability; the determination module determines whether the crack to be determined is a valid crack according to the conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation established in advance.

[0026] A computer-readable storage medium storing one or more programs, wherein the one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform any of the above methods.

[0027] A computing device comprises: one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the above methods.

[0028] The present invention adopts the above technical solution, which has the following advantages:

[0029] 1. The present invention avoids carrying out a large number of rock physics experiments, can effectively save costs, improve the benefits of exploration and development of fractured oil and gas reservoirs, and has strong economic efficiency.

[0030] 2. The present invention ensures accurate calculation of effective fracture widths in deep and ultra-deep fractured reservoirs while having effective, simple and practical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of a quantitative calculation method of effective fracture width based on core-logging in one embodiment of the present invention;

[0032] Figure 2This is a nano-CT scanning result of a fractured reservoir core sample in Well B of Gas Field A in one embodiment of the present invention (fracture width is 0.66 micrometers);

[0033] Figure 3 A gas field B well in one embodiment of the present invention Figure 2 The results of electrical imaging logging of core samples of medium-fracture reservoirs;

[0034] Figure 4 This is a micron CT scanning result of a fractured reservoir core sample in Well B of Gas Field A in one embodiment of the present invention (fracture width is 27 microns);

[0035] Figure 5 A gas field B well in one embodiment of the present invention Figure 4 Acoustic imaging logging results of core samples of medium-fracture reservoirs;

[0036] Figure 6 This is a CT scanning result of a plunger core sample of a fractured reservoir in a well B in a gas field A in an embodiment of the present invention (the fracture width is 53 microns);

[0037] Figure 7 This is an electrical imaging logging result diagram of a plunger core sample of a fractured reservoir in a well B in a gas field A in one embodiment of the present invention (fracture width is 50 microns);

[0038] Figure 8 This is a CT scanning result of a full-diameter core sample of a fractured reservoir in Well B of Gas Field A in one embodiment of the present invention (fracture width is 69 microns);

[0039] Fig. 9 This is an electrical imaging logging result diagram of a full-diameter core sample of a fractured reservoir in Well B of Gas Field A in one embodiment of the present invention (fracture width is 55 microns);

[0040] Fig.10 This is a CT scanning result of a full-diameter core sample of a fractured reservoir in Well C of Gas Field A in one embodiment of the present invention (fracture width is 150 microns);

[0041] Fig.11 This is an electrical imaging logging result diagram of a full-diameter core sample of a fractured reservoir in Well C of Gas Field A in one embodiment of the present invention (fracture width is 121 microns);

[0042] Fig.12 It is a distribution diagram of effective fractures and invalid fractures in the cross-plot of porosity and permeability of gas field A in one embodiment of the present invention;

[0043] Fig.13 This is an electrical imaging logging result diagram of a fractured reservoir in Well D of Gas Field A in one embodiment of the present invention (fracture width is 85 microns);

[0044] Fig.14 This is an electrical imaging logging result diagram of a fractured reservoir in Well E of Gas Field A in one embodiment of the present invention (fracture width is 190 microns);

[0045] Fig.15 This is a location diagram of well D and well E in the effective fracture area of ​​gas field A in one embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] The present invention aims at fractured reservoirs and proposes a quantitative calculation method and system for effective fracture width based on core-logging. By coupling the fracture width measured by rock physics experiments, the fracture width calculated by acoustic / electric imaging logging, and the contribution of different fracture widths to permeability, the width of effective fractures in fractured reservoirs can be accurately obtained, laying a foundation for accurate characterization of fractured reservoirs and productivity evaluation, thereby effectively improving the benefits of exploration and development of deep and ultra-deep fractured oil and gas reservoirs.

[0049] In one embodiment of the present invention, a method for quantitatively calculating effective fracture width based on core-logging is provided. This embodiment uses the method applied to a terminal as an example for illustration. It is understandable that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. In this embodiment, Figure 1 As shown, the method comprises the following steps:

[0050] 1) Perform the first-level scan on the core sample to determine whether there are cracks. If there are cracks, the crack width is measured experimentally, and it is determined whether the crack width needs to be calculated based on the logging data;

[0051] 2) Performing physical property experiments on multiple core samples including the core sample subjected to the first-stage scanning, measuring the first porosity and the first permeability of the multiple core samples, and determining whether to conduct the second-stage scanning according to the first permeability;

[0052] 3) For core samples without cracks in the first-level scan and core samples without crack width calculation, the second-level scan is performed to determine whether there are cracks. If there are cracks, the crack width is experimentally measured, and it is determined whether the crack width needs to be calculated based on the logging data;

[0053] 4) Performing physical property experiments on multiple core samples including the core sample subjected to the second-level scanning, measuring the second porosity and the second permeability of the multiple core samples, and determining whether to perform the second-level scanning on the next core sample according to the second permeability;

[0054] 5) Based on the pre-established conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation, it is determined whether the crack to be determined is a valid crack.

[0055] In the above step 1), the core sample is scanned at the first level to determine whether there are cracks, specifically:

[0056] A core sample at a preset depth of a fractured reservoir in a well of a certain oil and gas field is obtained, and a nano-CT scan is performed on the core sample as a first-level scan; if no fractures are found, a second-level scan is performed on the core sample.

[0057] In the above step 1), whether the fracture width needs to be calculated is determined based on the well logging data, specifically:

[0058] If the acoustic / electric imaging logging data collected in the well show no fractures, a second level scan is performed on the core sample;

[0059] If the acoustic / electric imaging logging data collected in the well show the existence of fractures, the fracture width can be obtained by logging calculation.

[0060] In the above step 2), whether to perform the second level scan is determined according to the first permeability, specifically:

[0061] If the first permeability change of the core sample is not obvious, the core sample is scanned at the second level;

[0062] If the first permeability of the core sample changes significantly, record and compare the experimentally measured crack width W of the core sample after the first level scan. c Calculate fracture width W by using acoustic / electrical imaging logging l .

[0063] In this embodiment, if the first permeability change relative to the core sample itself exceeds 80%, it is significant, otherwise it is not significant.

[0064] In the above step 3), the second level scan is a micron CT scan. The second level scan is performed to determine whether there are cracks. If there are cracks, the crack width is experimentally measured, and the crack width is determined based on the logging data to determine whether it is necessary to calculate the crack width. Specifically:

[0065] If the acoustic / electric imaging logging data collected by the well shows no fractures, the next core sample will be scanned for the second level; if the acoustic / electric imaging logging data collected by the well shows fractures, the fracture width will be obtained by logging calculation.

[0066] In the above step 4), whether to perform a second level scan on the next core sample is determined according to the second permeability, specifically:

[0067] If the second permeability of the core sample does not change significantly, continue to perform the second level scan on the next core sample;

[0068] If the second permeability of the core sample changes significantly, record and compare the experimentally measured fracture width W of the core sample after the second level scan. c Calculate fracture width W by using acoustic / electrical imaging logging l .

[0069] In this embodiment, if the second permeability change relative to the core sample itself exceeds 80%, it is significant, otherwise it is not significant.

[0070] In the above step 5), whether the crack to be determined is a valid crack is determined based on the conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation, which is established in advance, specifically:

[0071] If there is a core sample experimental measurement of the crack width, then determine whether the measured crack width is greater than the measured crack width W c , if it is greater than, the corresponding fracture can significantly improve the permeability of the reservoir, and it is an effective fracture;

[0072] If there is no core sample experimental measurement of fracture width, but there is fracture width calculated by logging, then determine whether the fracture width calculated by logging is greater than the fracture width calculated by acoustic / electric imaging logging. l , if it is greater than, the corresponding fracture can significantly improve the permeability of the reservoir, and it is an effective fracture.

[0073] Among them, the conversion relationship between the fracture width measured by nano / micro CT experiment of core samples and the fracture width calculated by acoustic / electric imaging logging is:

[0074] W c=f(W l ) (1)

[0075] Where W c W is the crack width measured by nano / micro CT experiment of core samples, μm; l Fracture width calculated for acoustic / electric imaging logs, μm.

[0076] Example:

[0077] Taking the fractured reservoir of gas field A as an example, the specific process of the quantitative calculation method of effective fracture width based on core-logging is described in detail with reference to the accompanying drawings.

[0078] 1) Based on the core samples at a certain depth of the fractured reservoir in Well B of Gas Field A, nano-CT scanning of the core samples was carried out, and cracks were found with a width of 0.66 microns. Figure 2 As shown in Figure 2, at the specific depth corresponding to the core sample where the fracture was found, the electrical imaging logging data collected from Well B showed that there were no fractures, as shown in Figure 2. Figure 3 As shown; the porosity of the core sample is 2.4% and the permeability is 0.1mD, indicating that the fractures found in step 1) do not significantly improve the permeability of the core sample.

[0079] 2) Based on the core samples at a certain depth of the fractured reservoir in Well B of Gas Field A, micron CT scanning of the core samples was carried out and cracks were found. The crack width was 27 microns, such as Figure 4 As shown in Figure 2, at the specific depth corresponding to the core sample where the fracture was found, the acoustic imaging logging data collected by Well B showed that there were no fractures, as shown in Figure 2. Figure 5 As shown; the porosity of the core sample is 5.5% and the permeability is 0.73mD, indicating that the fractures found in step 2) do not significantly improve the permeability of the core sample.

[0080] 3) Based on the core samples at a certain depth of the fractured reservoir in Well B of Gas Field A, CT scanning of the plunger core samples was carried out and cracks were found. The experimental measurement of the crack width was 53 microns, such as Figure 6 As shown in the figure; at the specific depth corresponding to the core sample where the fracture was found, the electrical imaging logging data collected from Well B showed that fractures were developed, and the fracture width calculated by logging was 50 microns, as shown in the figure. Figure 7 As shown; the porosity of the plug core sample is 2.3% and the permeability is 0.1mD, indicating that the fractures found in step 3) do not significantly improve the permeability of the plug core sample.

[0081] 4) Based on the core samples at a certain depth of the fractured reservoir in Well B of Gas Field A, CT scanning of the full-diameter core samples was carried out and cracks were found. The experimental measurement of the crack width was 69 microns, such as Figure 8As shown in the figure; at the specific depth corresponding to the core sample where the fracture was found, the electrical imaging logging data collected from Well B showed that fractures were developed, and the fracture width calculated by logging was 55 microns, as shown in the figure. Fig. 9 As shown; the porosity of the full-diameter core sample is 4.7% and the permeability is 1.2mD, indicating that the fractures found in step 4) have improved the permeability of the full-diameter core sample to a certain extent.

[0082] 5) Based on the core samples at a certain depth of the fractured reservoir in Well C of Gas Field A, CT scanning of the full-diameter core samples was carried out to find cracks. The experimental measurement of the crack width was 150 microns, such as Fig.10 As shown in the figure; at the specific depth corresponding to the core sample where the fracture was found, the electrical imaging logging data collected from Well C showed that fractures were developed, and the fracture width calculated by logging was 121 microns, as shown in the figure. Fig.11 As shown; the porosity of the full-diameter core sample is 6.2% and the permeability is 5.2mD, indicating that the fractures found in step 5) have significantly improved the permeability of the full-diameter core sample.

[0083] 6) Repeat steps 1) to 5) to carry out CT scanning and physical property analysis experiments on multiple core samples of different scales in fractured reservoirs of multiple wells in gas field A, and obtain fracture width, porosity, and permeability by experimental measurement; compare the changes in permeability of multiple core samples under similar porosity conditions, and classify the areas with no obvious changes in permeability as invalid fracture areas, and the areas with obvious changes in permeability as effective fracture areas; as shown in Table 1 and Fig.12 shown.

[0084] Table 1 Porosity, permeability and logging calculated fracture width of fractured reservoir core samples in the A gas field

[0085] hashtag Porosity Permeability / mD Logging calculation of fracture width / μm B 0.1％ 0.70 47 B 0.6％ 0.11 No cracks B 1.3％ 0.05 No cracks B 2.1％ 0.17 No cracks B 2.4％ 0.10 No cracks B 6.1％ 0.53 38 B 6.4％ 0.17 No cracks B 4.7％ 1.20 55 B 2.3％ 0.10 50 B 5.5％ 0.73 49 C 0.2％ 0.17 No cracks C 0.7％ 0.02 No cracks C 0.7％ 0.05 No cracks C 1.3％ 0.17 No cracks C 2.0％ 0.67 45 C 3.2％ 0.16 No cracks C 6.4％ 0.35 No cracks C 6.2％ 5.20 121

[0086] 7) Fine processing and interpretation of the acoustic / electric imaging logging data corresponding to the core sample in step 6), and the fracture width is obtained by logging calculation; the conversion relationship between the fracture width measured by CT scanning experiment and the fracture width calculated by acoustic / electric imaging logging is established:

[0087] W c =1.0156W l +9.4319

[0088] Where W c W is the crack width measured by nano / micro CT experiment on core samples, micrometer; l Fracture width calculated for acoustic / electric imaging logs, microns.

[0089] It was further determined that the lower limit of the effective fracture width calculated by well logging in gas field A was approximately 55 microns, and the lower limit of the effective fracture width measured experimentally was approximately 65 microns.

[0090] 8) Finely process and interpret the electrical imaging logging data of the fractured reservoir at a certain depth in Well D of Gas Field A. The fracture width calculated by logging is 85 microns, which is an effective fracture. Fig.13 As shown in Figure 2, the porosity of the full-diameter core sample at the corresponding depth of Well D is 4.4%, and the permeability is 2.12 mD. Fig.12 The position in Fig.15 As shown, it is located in the effective crack area.

[0091] 9) Finely process and interpret the electrical imaging logging data of the fractured reservoir at a certain depth in Well E of Gas Field A. The logging calculated the fracture width to be 190 microns, which is an effective fracture. Fig.14 As shown in Figure 2, the porosity of the full-diameter core sample at the corresponding depth of Well E is 0.7%, and the permeability is 2.36 mD. Fig.12 The position in Fig.15 As shown in Table 2, it is located in the effective crack area.

[0092] Table 2 Porosity, permeability and fracture width calculated by logging of fractured reservoir core samples from Well D and Well E in A gas field

[0093] hashtag Porosity Permeability / mD Logging calculation of fracture width / μm D 4.4％ 2.12 85 E 0.7％ 2.36 190

[0094] In one embodiment of the present invention, a system for quantitatively calculating effective fracture width based on core-logging is provided, which comprises:

[0095] The first-level scanning module performs the first-level scanning on the core sample to determine whether there are cracks. If there are cracks, the crack width is measured experimentally and it is determined whether the crack width needs to be calculated based on the logging data.

[0096] A first judgment module performs physical property experiments on multiple core samples including the core sample subjected to the first level scan, measures the first porosity and the first permeability of the multiple core samples, and judges whether to conduct the second level scan according to the first permeability;

[0097] The secondary scanning module performs a second-level scan on the core samples that have no cracks in the first-level scan and the core samples whose crack widths have not been calculated to determine whether there are cracks. If there are cracks, the crack widths are measured experimentally and it is determined whether the crack widths need to be calculated based on the logging data.

[0098] The second judgment module performs physical property experiments on multiple core samples including the core sample subjected to the second-level scanning, measures the second porosity and the second permeability of the multiple core samples, and judges whether to perform the second-level scanning on the next core sample according to the second permeability;

[0099] The determination module determines whether the crack to be determined is a valid crack according to a conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation established in advance.

[0100] The system provided in this embodiment is used to execute the above-mentioned method embodiments. Please refer to the above-mentioned embodiments for specific processes and detailed contents, which will not be repeated here.

[0101] A computing device provided in one embodiment of the present invention may be a terminal, which may include: a processor, a communications interface, a memory, a display screen, and an input device. The processor, the communications interface, and the memory communicate with each other via a communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium and an internal memory, wherein the non-volatile storage medium stores an operating system and a computer program, and the computer program is executed by the processor to implement a computing method; the internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner may be implemented through WIFI, a management network, NFC (near field communication) or other technologies. The display screen may be a liquid crystal display screen or an electronic ink display screen, and the input device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computing device, or an external keyboard, touchpad or mouse, etc. The processor can call the logic instructions in the memory to execute the following method: perform a first-level scan on the core sample to determine whether there is a crack, and if there is a crack, obtain the crack width by experimental measurement, and determine whether the crack width needs to be calculated according to the logging data; perform physical property experiments on multiple core samples including the core sample that performs the first-level scan, measure the first porosity and the first permeability of the multiple core samples, and determine whether to perform a second-level scan according to the first permeability; perform a second-level scan on the core samples without cracks in the first-level scan and the core samples whose crack width is not calculated to determine whether there is a crack, and if there is a crack, obtain the crack width by experimental measurement, and determine whether the crack width needs to be calculated according to the logging data; perform physical property experiments on multiple core samples including the core sample that performs the second-level scan, measure the second porosity and the second permeability of the multiple core samples, and determine whether to perform a second-level scan on the next core sample according to the second permeability; and determine whether the crack to be determined is a valid crack according to the pre-established conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation.

[0102] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0103] Those skilled in the art will understand that the structure of the above-mentioned computing device is only a partial structure related to the scheme of the present application, and does not constitute a limitation on the computing device to which the scheme of the present application is applied. The specific computing device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0104] In one embodiment of the present invention, a computer program product is provided, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, and when the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments, for example, comprising: performing a first-level scan on a core sample to determine whether there are cracks, and if there are cracks, experimentally measuring the width of the cracks, and determining whether the crack width needs to be calculated based on logging data; performing physical property experiments on a plurality of core samples including the core sample subjected to the first-level scan, measuring the first porosity and the first permeability of the plurality of core samples, and determining whether the first porosity and the first permeability of the plurality of core samples need to be calculated based on the first-level scan; The first level permeability is used to determine whether to conduct a second level scan; for core samples without cracks in the first level scan and core samples without calculated crack width, a second level scan is performed to determine whether there are cracks. If there are cracks, the crack width is experimentally measured, and it is determined whether the crack width needs to be calculated based on the logging data; physical property experiments are performed on multiple core samples including the core sample subjected to the second level scan, and the second porosity and second permeability of the multiple core samples are measured, and it is determined whether to conduct a second level scan on the next core sample based on the second permeability; based on the conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation established in advance, it is determined whether the crack to be determined is an effective crack.

[0105] In one embodiment of the present invention, a non-transitory computer-readable storage medium is provided, which stores server instructions, and the computer instructions enable a computer to execute the methods provided in the above embodiments, for example, including: performing a first-level scan on a core sample to determine whether there are cracks, and if there are cracks, experimentally measuring the width of the cracks, and judging whether the crack width needs to be calculated based on the logging data; performing physical property experiments on multiple core samples including the core sample subjected to the first-level scan, measuring the first porosity and the first permeability of the multiple core samples, and judging whether to perform a second-level scan based on the first permeability; and performing a first-level scan on the core sample. The first-level scanning is for core samples without cracks and core samples without calculated crack widths, and the second-level scanning is performed to determine whether there are cracks. If there are cracks, the crack width is experimentally measured, and it is determined whether the crack width needs to be calculated based on the logging data; physical property experiments are performed on multiple core samples including the core samples subjected to the second-level scanning, and the second porosity and second permeability of the multiple core samples are measured, and it is determined whether the second-level scanning is performed on the next core sample based on the second permeability; based on the pre-established conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation, it is determined whether the crack to be determined is an effective crack.

[0106] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0107] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 generate 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 flowchart and / or block diagram. 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.

[0108] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quantitative calculation method of effective fracture width based on core-logging, characterized in that: include: Perform the first level scan on the core sample to determine whether there are cracks. If there are cracks, the crack width is measured experimentally, and it is determined whether the crack width needs to be calculated based on the logging data; Performing physical property experiments on multiple core samples including the core sample subjected to the first-level scanning, measuring first porosities and first permeabilities of the multiple core samples, and determining whether to perform the second-level scanning according to the first permeabilities; For the core samples without cracks in the first-level scanning and the core samples without calculating the crack width, a second-level scanning is performed to determine whether cracks exist. If cracks exist, the crack width is experimentally measured, and whether the crack width needs to be calculated is determined based on the well logging data; Performing physical property experiments on multiple core samples including the core sample subjected to the second-level scanning, measuring the second porosity and the second permeability of the multiple core samples, and determining whether to perform the second-level scanning on the next core sample according to the second permeability; Whether the crack to be determined is a valid crack is determined based on a conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation, which is established in advance.

2. The method for quantitatively calculating effective fracture width based on core logging according to claim 1, characterized in that: The first level scanning of the core sample to determine whether there are cracks includes: Obtaining a core sample at a preset depth of a fractured reservoir in a well of a certain oil and gas field, and performing a nano-CT scan on the core sample as the first-level scan; If no cracks are found, the core sample is subjected to the second level scan.

3. The method for quantitatively calculating effective fracture width based on core-logging according to claim 1, characterized in that: The step of judging whether it is necessary to calculate the fracture width according to the well logging data includes: If the acoustic / electric imaging logging data collected in the well show that there are no fractures, the second level scanning is performed on the core sample; If the acoustic / electric imaging logging data collected in the well show the existence of fractures, the fracture width can be obtained by logging calculation.

4. The method for quantitatively calculating effective fracture width based on core logging according to claim 1, characterized in that: The determining whether to perform a second level scan according to the first permeability includes: If the first permeability of the core sample does not change significantly, performing the second level scanning on the core sample; If the first permeability of the core sample changes significantly, the fracture width measured experimentally after the first level scanning of the core sample and the fracture width calculated by the acoustic / electric imaging logging are recorded and compared.

5. The method for quantitatively calculating effective fracture width based on core-logging according to claim 1, characterized in that: The second level scan is a micron CT scan; The second level scanning is performed to determine whether there are cracks. If there are cracks, the crack width is obtained by experimental measurement, and it is determined whether the crack width needs to be calculated based on the logging data, including: If the acoustic / electric imaging logging data collected in the well show no fractures, continue to scan the next core sample for the second level; If the acoustic / electric imaging logging data collected in the well show the existence of fractures, the fracture width can be obtained by logging calculation.

6. The method for quantitatively calculating effective fracture width based on core-logging according to claim 1, characterized in that: The step of judging whether to perform the second level scanning on the next core sample according to the second permeability includes: If the second permeability of the core sample does not change significantly, continue to perform the second level scan on the next core sample; If the second permeability of the core sample changes significantly, record and compare the fracture width experimentally measured after the second level scanning of the core sample and the fracture width calculated by the acoustic / electric imaging logging.

7. The method for quantitatively calculating effective fracture width based on core logging according to claim 1, characterized in that: The step of judging whether the crack to be determined is a valid crack based on the pre-established conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation includes: If there is a crack width measured experimentally in a core sample, determine whether the measured crack width is greater than the measured crack width of the sample. If so, it is an effective crack. If there is no core sample experimental measurement of fracture width, but there is fracture width calculated by logging, then determine whether the fracture width calculated by logging is greater than the fracture width calculated by acoustic / electric imaging logging and greater than the fracture width calculated by logging of the sample. If so, it is an effective fracture.

8. A quantitative calculation system for effective fracture width based on core-logging, characterized in that: include: The first-level scanning module performs the first-level scanning on the core sample to determine whether there are cracks. If there are cracks, the crack width is measured experimentally and it is determined whether the crack width needs to be calculated based on the logging data. A first judgment module performs a physical property experiment on a plurality of core samples including the core sample subjected to the first-level scanning, measures a first porosity and a first permeability of the plurality of core samples, and judges whether to perform a second-level scanning according to the first permeability; A secondary scanning module performs a second-level scanning on the core samples without cracks in the first-level scanning and the core samples without calculating the crack width to determine whether there are cracks. If there are cracks, the crack width is obtained by experimental measurement, and it is determined whether the crack width needs to be calculated according to the logging data; A second judgment module performs physical property experiments on multiple core samples including the core sample subjected to the second-level scanning, measures the second porosity and the second permeability of the multiple core samples, and judges whether to perform the second-level scanning on the next core sample according to the second permeability; The determination module determines whether the crack to be determined is a valid crack according to a conversion relationship between the crack width obtained by experimental measurement and the crack width obtained by calculation established in advance.

9. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform any one of the methods of claims 1 to 7.

10. A computing device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any one of the methods described in claims 1 to 7.

Images