Shale diagenesis evolution sequence intersection chart construction method, identification method and device

Abstract

The invention discloses a shale diagenesis evolution sequence intersection chart construction method, identification method and device, and the construction method comprises the steps: determining a shale diagenesis evolution sequence of a research area based on a shale core sample of coring logging in the research area; performing a high-pressure mercury injection experiment on the shale core sample to determine pore throat radius distribution of the shale core sample; determining the shale pore type and relative content of the shale core sample based on the pore throat radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; wherein the pore types of the shale comprise micropores, mesopores and macropores; determining pore types and relative contents in different shale diagenesis evolution sequences based on the shale diagenesis evolution sequences and the shale pore types and contents of the shale core samples; and based on pore types and relative contents in different shale diagenetic evolution sequences, constructing a shale diagenetic evolution sequence intersection chart so as to quickly and accurately identify and divide the shale diagenetic evolution sequences based on a nuclear magnetic resonance T2 spectrum.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to a construction method, an identification method and a device for a shale diagenetic evolution sequence cross-plot. Background Art

[0002] The diagenetic process and evolution mechanism of shale are of great significance to the selection and evaluation of shale gas exploration and development areas and the enrichment and improvement of unconventional oil and gas geological theories.

[0003] Diagenetic evolution is an important part of oil and gas reservoir research, and diagenesis directly controls the quality of the reservoir. Traditional diagenetic evolution research mainly relies on a large amount of thin sections, physical properties, cathode luminescence, scanning electron microscopy, X-ray diffraction and other experimental data. The diagenetic evolution stage of the sample can be roughly divided through qualitative evaluation methods. The analysis and testing required by traditional methods are costly and rely heavily on the experience of geologists, with strong randomness and large errors. In addition, it is impossible to identify the diagenetic evolution sequence of reservoirs at any burial depth underground. Summary of the invention

[0004] In order to accurately identify the shale diagenetic evolution sequence based on nuclear magnetic resonance T2 spectrum information, thereby enriching the process route and increasing the selection space, a method for constructing a shale diagenetic evolution sequence cross-plot, an identification method and a device are provided in an embodiment of the present invention.

[0005] In a first aspect, an embodiment of the present invention provides a method for constructing a shale diagenetic evolution sequence intersection chart, which may include:

[0006] Determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained from coring and logging in the study area;

[0007] Performing a high-pressure mercury injection experiment on the shale core sample to determine the pore radius distribution of the shale core sample;

[0008] Based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample, the shale pore type and relative content of the shale core sample are determined; wherein the shale pore type includes: micropores, mesopores and macropores;

[0009] Based on the shale diagenetic evolution sequence and the shale pore types and contents of the shale core samples, determining the pore types and relative contents in different shale diagenetic evolution sequences;

[0010] Based on the pore types and their relative contents in different shale diagenetic evolution sequences, an intersection chart of the shale diagenetic evolution sequences is constructed.

[0011] Optionally, determining the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample may include:

[0012] Determine the conversion coefficient between the nuclear magnetic resonance T2 spectrum and the shale pore radius based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample;

[0013] Based on the conversion coefficient, the shale pore type and relative content of the shale core sample are determined using the nuclear magnetic resonance T2 spectrum distribution.

[0014] Optionally, determining the shale pore type and relative content of the shale core sample based on the conversion coefficient and using the nuclear magnetic resonance T2 spectrum distribution may include:

[0015] Determining void radius thresholds for different shale pore types based on the conversion coefficient;

[0016] Based on the void radius thresholds of different shale pore types, the shale pore type and relative content of the shale core sample are determined by the nuclear magnetic resonance T2 spectrum distribution.

[0017] Optionally, the determining of the shale diagenetic evolution sequence in the study area based on the shale core samples obtained by coring and logging in the study area may include:

[0018] Based on the shale core sample, determining the mineral composition and mineral content of the shale core sample;

[0019] Based on the mineral composition and the mineral content, the shale diagenetic evolution sequence of the study area is determined.

[0020] Optionally, determining the shale diagenetic evolution sequence of the study area based on the mineral composition and the mineral content may include:

[0021] Determine the mineral content and boundaries in the shale diagenetic evolution sequence based on the vitrinite reflectance, hydrocarbon generation window and maturity of the shale core sample;

[0022] The shale diagenetic evolution sequence of the study area is determined based on the mineral composition content and boundaries of the determined shale diagenetic evolution sequence and the mineral composition and mineral content of the shale core sample.

[0023] Optionally, after constructing the shale diagenetic evolution sequence intersection chart, the following steps may also be included:

[0024] Based on the magnetic resonance T2 spectrum distribution of shale core samples from other coring and logging in the study area, and the pore radius distribution determined by high-pressure mercury injection experiments, the intersection chart of the shale diagenetic evolution sequence is verified.

[0025] In a second aspect, an embodiment of the present invention provides a method for identifying a shale diagenetic evolution sequence, which may include:

[0026] Based on the distribution of nuclear magnetic resonance T2 spectrum obtained by nuclear magnetic logging of the target well and the intersection chart of shale diagenetic evolution sequence, the shale diagenetic evolution sequence is identified;

[0027] The shale diagenetic evolution sequence intersection chart is pre-constructed based on the construction method of the shale diagenetic evolution sequence intersection chart described in the first aspect.

[0028] In a third aspect, an embodiment of the present invention provides a device for constructing a shale diagenetic evolution sequence intersection chart, which may include:

[0029] A first determination module is used to determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained by coring and logging in the study area;

[0030] An acquisition module, used for acquiring the high-pressure mercury injection test result of the shale core sample to determine the pore radius distribution of the shale core sample;

[0031] A second determination module is used to determine the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; wherein the shale pore type includes: micropores, mesopores and macropores;

[0032] A third determination module is used to determine the pore types and relative contents in different shale diagenetic evolution sequences based on the shale diagenetic evolution sequence and the shale pore types and contents of the shale core sample;

[0033] A construction module is used to construct an intersection chart of the shale diagenetic evolution sequence based on the pore types and their relative contents in different shale diagenetic evolution sequences.

[0034] In a fourth aspect, an embodiment of the present invention provides a device for identifying a shale diagenetic evolution sequence, which may include:

[0035] An identification module, used to identify the shale diagenetic evolution sequence based on the distribution of nuclear magnetic resonance T2 spectrum obtained by nuclear magnetic logging of the target well and the intersection chart of the shale diagenetic evolution sequence;

[0036] The shale diagenetic evolution sequence intersection chart is pre-constructed based on the construction method of the shale diagenetic evolution sequence intersection chart described in the first aspect.

[0037] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for constructing a shale diagenetic evolution sequence intersection map as described in the first aspect, or implements a method for identifying a shale diagenetic evolution sequence as described in the second aspect.

[0038] In a sixth aspect, an embodiment of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for constructing an intersection map of shale diagenetic evolution sequences as described in the first aspect is implemented, or the method for identifying shale diagenetic evolution sequences as described in the second aspect is implemented.

[0039] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0040] The embodiment of the present invention provides a method for constructing, identifying and using a shale diagenetic evolution sequence intersection diagram. The construction method clarifies the regional diagenetic evolution sequence through a small amount of core experiments, and then quantitatively extracts relevant parameters by combining the nuclear magnetic resonance response characteristics of different diagenetic evolution sequences. The method of cross-analysis of parameters with high correlation is used to construct a shale diagenetic evolution sequence intersection diagram to achieve automatic and accurate identification of diagenetic evolution sequences. Through the embodiment of the present invention, researchers can preliminarily master the analysis and division of diagenetic evolution sequences even if they do not have complete sedimentological knowledge.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0042] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0044] Figure 1 A flow chart of a method for constructing a shale diagenetic evolution sequence intersection chart provided in an embodiment of the present invention;

[0045] Figure 2 A flowchart of a method for constructing a detailed shale diagenetic evolution sequence intersection diagram provided in an embodiment of the present invention;

[0046] Figure 3A distribution diagram of mineral components and their contents in the shale diagenetic evolution sequence provided in an embodiment of the present invention;

[0047] Figure 4 A distribution diagram of relative pore content in the intersection diagram of the shale diagenetic evolution sequence provided in an embodiment of the present invention;

[0048] Figure 5 It is a schematic structural diagram of a device for constructing a shale diagenetic evolution sequence intersection diagram provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0050] The nuclear magnetic resonance T2 spectrum contains rich geological and geophysical information, which can be obtained through well logging and core experiments. It has the characteristics of rapid and non-destructive testing. Through long-term in-depth research, domestic and foreign scholars have established the relationship between the nuclear magnetic resonance T2 spectrum and shale pore structure, reservoir quality, and fluid information. However, the inventors found that there is no research on the correlation between nuclear magnetic resonance T2 spectrum information and diagenetic evolution in the prior art; at the same time, it is very expensive and time-consuming to analyze the shale diagenetic evolution sequence by conventional means of taking cores, and the resource cost is relatively high. In view of this, an embodiment of the present invention provides a method for constructing, an identification method, and a device for a shale diagenetic evolution sequence intersection diagram.

[0051] Embodiment 1

[0052] In the first embodiment of the present invention, a method for constructing a shale diagenetic evolution sequence intersection chart is provided. In order to accurately realize the diagenetic evolution analysis and diagenetic evolution sequence division of shale at different depths in the core and the well, the method gives full play to the rich information of the nuclear magnetic resonance T2 spectrum, establishes the relationship between the diagenetic evolution sequence and the nuclear magnetic resonance T2 spectrum through methods such as core calibration logging, so as to construct a shale diagenetic evolution sequence intersection chart, and finally realizes the identification of the shale diagenetic evolution sequence based on the nuclear magnetic resonance T2 spectrum. Figure 1 As shown, the method may include the following steps:

[0053] Step S11: Determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained through coring and logging in the study area.

[0054] Step S12: Perform a high-pressure mercury injection experiment on the shale core sample to determine the pore radius distribution of the shale core sample.

[0055] Step S13: determining the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; wherein the shale pore type may include: micropores, mesopores and macropores.

[0056] Step S14: Determine the pore types and relative contents in different shale diagenetic evolution sequences based on the shale diagenetic evolution sequence and the shale pore types and contents of the shale core samples.

[0057] Step S15: constructing a shale diagenetic evolution sequence intersection chart based on the pore types and their relative contents in different shale diagenetic evolution sequences.

[0058] The method provided in the embodiment of the present invention clarifies the regional diagenetic evolution sequence through a small amount of core experiments, and then combines the nuclear magnetic resonance response characteristics of different diagenetic evolution sequences to quantitatively extract relevant parameters, and uses the method of crossover analysis of highly correlated parameters to construct a shale diagenetic evolution sequence intersection map to achieve automatic and accurate identification of diagenetic evolution sequences. Through the embodiment of the present invention, even if researchers do not have complete sedimentological knowledge, they can preliminarily master the analysis of diagenetic evolution sequences and the division of diagenetic evolution sequences.

[0059] In a detailed embodiment, referring to Figure 2 As shown, the method for constructing the above-mentioned shale diagenetic evolution sequence intersection chart may specifically include the following steps:

[0060] Step S20: Obtain core samples from several wells in the study area.

[0061] In the embodiment of the present invention, the obtained core samples are divided into two parts, one part is used to construct the shale diagenetic evolution sequence intersection plate, and the other part is used to verify the constructed shale diagenetic evolution sequence intersection plate.

[0062] Step S21: Determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained through coring and logging in the study area.

[0063] When this step is specifically implemented, firstly, the mineral composition and mineral content of the shale core sample are determined based on the shale core sample; then, based on the mineral composition and mineral content, the shale diagenetic evolution sequence of the study area is determined.

[0064] The embodiment of the present invention obtains information related to vitrinite reflectance, hydrocarbon generation window, maturity, mineral composition, mineral content and physical properties by analyzing shale core samples in the laboratory, such as organic geochemistry, cast thin sections, scanning electron microscopy, X-ray diffraction, micrometer CT and other core analysis experiments.

[0065] Among them, mineral composition and mineral content refer to silica content, carbonate mineral content, clay mineral type and content. Based on the above mineral composition and mineral content, the mineral distribution characteristics of the triangular diagram can be used to determine the diagenetic evolution sequence of shale using a combination of qualitative and quantitative methods. For example, based on the distribution positions of the three diagenetic evolution sequences in the ternary intersection diagram of silica minerals, carbonate minerals, and clay minerals, the mineral content and boundaries of the three diagenetic evolution sequences can be obtained based on regional experience. Figure 3 The division of shale diagenesis evolution stages is shown in Figure 1. Figure 3 There are three shale diagenetic evolution sequences: A, B, and C.

[0066] In another specific embodiment, in the division Figure 3 When determining the boundaries of the shale diagenetic evolution stages in the study area, the mineral contents and boundaries of the three diagenetic evolution sequences can be determined based on the empirical values ​​of the study area. Of course, the mineral content and boundaries of the shale diagenetic evolution sequence can also be determined based on the vitrinite reflectance, hydrocarbon generation window and maturity of the shale core samples. Finally, the shale diagenetic evolution sequence in the study area can be determined based on the mineral composition and mineral content of the shale core samples in combination with the determined mineral content and boundaries of the shale diagenetic evolution sequence.

[0067] Step S22, perform a high-pressure mercury injection test on the shale core sample to determine the pore radius distribution of the shale core sample. This step can be to perform a high-pressure mercury injection test on the shale samples that have been classified into shale diagenetic sequence types for use in constructing the chart, so that the pore radius distribution of the shale core sample can be analyzed.

[0068] Step S23: determining the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; wherein the shale pore type may include: micropores, mesopores and macropores.

[0069] Before executing this step, nuclear magnetic resonance logging data of core logging can be obtained, or a nuclear magnetic resonance test can be performed in a laboratory to measure the nuclear magnetic resonance signal of saturated water and obtain the nuclear magnetic resonance T2 spectrum through inversion.

[0070] In the specific implementation of step S23, first, based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample, the conversion coefficient between the nuclear magnetic resonance T2 spectrum and the shale pore radius is determined; then, based on the conversion coefficient, the shale pore type and its relative content of the shale core sample are determined by the nuclear magnetic resonance T2 spectrum distribution. In the embodiment of the present invention, the conversion relationship between the T2 spectrum and the pore radius is established through the core nuclear magnetic resonance experiment and the high-pressure mercury injection experiment, and the shale is divided into micropores, mesopores (mesopores) and macropores according to the T2 spectrum in combination with the pore size standard formulated by IUPAC.

[0071] In the above steps, based on the conversion coefficient, the shale pore type and its relative content of the shale core sample are determined by the nuclear magnetic resonance T2 spectrum distribution, which can specifically include: determining the void radius threshold of different shale pore types based on the conversion coefficient; for example, 1 millisecond corresponds to 1 micron pore in the T2 spectrum. Then, based on the void radius threshold of different shale pore types, the shale pore type and its relative content of the shale core sample are determined by the nuclear magnetic resonance T2 spectrum distribution.

[0072] Step S24, based on the shale diagenetic evolution sequence and the shale pore type and content of the shale core sample, determine the pore type and relative content in different shale diagenetic evolution sequences. In this step, the above-mentioned different shale diagenetic evolution sequences (A, B, C) and the pore type and relative content in different sequences are obtained, and their corresponding relationship is innovatively established, so that the pore type and absolute content in different shale diagenetic evolution sequences in the study area can be known, so as to lay the foundation for identification and classification by nuclear magnetic resonance T2 spectrum.

[0073] Step S25: constructing a shale diagenetic evolution sequence intersection chart based on the pore types and their relative contents in different shale diagenetic evolution sequences.

[0074] For example, taking the shale in a certain research area as an example, the diagenetic evolution sequence A is interbedded shale and shell limestone phase, the diagenetic evolution sequence B is interbedded gray band shale phase, and the diagenetic evolution sequence C is medium-thick gray-black clay / siliceous shale phase. Their distribution boundaries are as follows: Figure 4 .from Figure 4 It can be seen that the identification limit of diagenetic evolution sequence A is: the relative content of micropores is less than 13.5%, and the relative content of mesopores is less than 64%; the identification limit of diagenetic evolution sequence B is: the relative content of micropores is between 13.5% and 17%, and the relative content of mesopores is between 64% and 83%; the identification limit of diagenetic evolution sequence C is: the relative content of micropores is greater than 17% or the relative content of mesopores is greater than 83%.

[0075] Step S26: Based on the magnetic resonance T2 spectrum distribution of shale core samples from other coring and logging in the study area and the pore radius distribution determined by high-pressure mercury injection experiments, the shale diagenetic evolution sequence intersection chart is verified. This step is used to improve the chart and verify the accuracy of identification.

[0076] The above-mentioned construction method provided in the embodiment of the present invention fully considers the influence of diagenesis and evolutionary history on pore structure and different pore sizes, determines the relative pore content of different pore sizes such as micropores, mesopores and macropores through nuclear magnetic resonance T2 spectrum, and combines the diagenetic evolution sequence division method based on traditional methods such as mineral composition to determine the proportion of micropores and mesopores in different diagenetic evolution sequences. By using the intersection plate technology, the division and identification of shale diagenetic evolution sequences based on nuclear magnetic resonance T2 spectrum can be realized, which can not only process the core nuclear magnetic resonance T2 spectrum, but also the nuclear magnetic resonance logging T2 spectrum.

[0077] Based on the same inventive concept, a device for constructing a shale diagenetic evolution sequence intersection diagram is provided in an embodiment of the present invention, referring to Figure 5 As shown, the device may include: a first determination module 51, an acquisition module 52, a second determination module 53, a third determination module 54 and a construction module 55, and its working principle is as follows:

[0078] The first determination module 51 is used to determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained by coring and logging in the study area;

[0079] The acquisition module 52 is used to obtain the results of high-pressure mercury injection experiments on shale core samples to determine the pore radius distribution of the shale core samples;

[0080] The second determination module 53 is used to determine the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; wherein the shale pore type includes: micropores, mesopores and macropores;

[0081] The third determination module 54 is used to determine the pore types and relative contents in different shale diagenetic evolution sequences based on the shale diagenetic evolution sequence and the shale pore types and contents of the shale core samples;

[0082] The construction module 55 is used to construct a shale diagenetic evolution sequence intersection chart based on the pore types and their relative contents in different shale diagenetic evolution sequences.

[0083] In an optional embodiment, the second determining module 53 is specifically configured to:

[0084] Determine the conversion coefficient between the nuclear magnetic resonance T2 spectrum and the shale pore radius based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample;

[0085] Based on the conversion coefficient, the shale pore type and relative content of the shale core sample are determined using the nuclear magnetic resonance T2 spectrum distribution.

[0086] In another optional embodiment, the second determining module 53 is further configured to:

[0087] Determining void radius thresholds for different shale pore types based on the conversion coefficient;

[0088] Based on the void radius thresholds of different shale pore types, the shale pore type and relative content of the shale core sample are determined by the nuclear magnetic resonance T2 spectrum distribution.

[0089] In another optional embodiment, the first determining module 51 is specifically configured to:

[0090] Based on the shale core sample, determining the mineral composition and mineral content of the shale core sample;

[0091] Based on the mineral composition and the mineral content, the shale diagenetic evolution sequence of the study area is determined.

[0092] In another optional embodiment, the first determining module 51 is further configured to:

[0093] Determine the mineral content and boundaries in the shale diagenetic evolution sequence based on the vitrinite reflectance, hydrocarbon generation window and maturity of the shale core sample;

[0094] The shale diagenetic evolution sequence of the study area is determined based on the mineral composition content and boundaries of the determined shale diagenetic evolution sequence and the mineral composition and mineral content of the shale core sample.

[0095] In another alternative embodiment, referring to Figure 5 As shown, the device may also include: a verification module 56, which is used to verify the shale diagenetic evolution sequence intersection chart based on the magnetic resonance T2 spectrum distribution of shale core samples of other coring and logging in the study area, and the pore radius distribution determined by the high-pressure mercury injection experiment.

[0096] Based on the same inventive concept, a computer-readable storage medium is provided in an embodiment of the present invention, on which a computer program is stored. When the program is executed by a processor, the method for constructing the above-mentioned shale diagenetic evolution sequence intersection map is implemented.

[0097] Based on the same inventive concept, a computer device is provided in an embodiment of the present invention, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for constructing the above-mentioned shale diagenetic evolution sequence intersection map is implemented.

[0098] Embodiment 2

[0099] Embodiment 2 of the present invention provides a method for identifying a shale diagenetic evolution sequence, comprising:

[0100] Identify the shale diagenetic evolution sequence based on the distribution of the nuclear magnetic resonance T2 spectrum obtained from the target well nuclear magnetic logging and the intersection chart of the shale diagenetic evolution sequence;

[0101] The shale diagenetic evolution sequence intersection chart is pre-constructed based on the construction method of the shale diagenetic evolution sequence intersection chart described in Example 1.

[0102] The embodiment of the present invention processes the nuclear magnetic resonance T2 spectrum information, mines the connotation information in the nuclear magnetic resonance T2 spectrum, establishes the correspondence between the nuclear magnetic resonance response and related parameters and the diagenesis and evolution history of shale, and realizes the shale diagenetic evolution sequence division and identification method based on the nuclear magnetic resonance T2 spectrum through core calibration. By dividing the shale diagenetic evolution sequence with the help of the logging parameter nuclear magnetic T2 spectrum, the data is easy to obtain and continuous. At the same time, the established shale diagenetic evolution sequence division chart is convenient and fast, so that beginners can also accurately divide the shale diagenetic evolution stage. The specific advantages are as follows:

[0103] (1) A method for classifying shale diagenetic evolution sequences based on nuclear magnetic resonance T2 spectroscopy is proposed. This method can solve the problem that the existing shale diagenetic evolution sequence classification and identification requires a large amount of core experimental calibration.

[0104] (2) It avoids problems such as inaccurate grasp of the division of diagenetic evolution sequences due to researchers' lack of experience and randomness, and the resulting diagenetic evolution sequence types are more accurate.

[0105] (3) It can also realize automatic identification of diagenetic evolution sequence at any burial depth in the well through nuclear magnetic resonance logging and other means.

[0106] (4) This method is used to establish the diagenetic evolution sequence of the study area, which can support oil and gas exploration and provide a basis for oil and gas genesis, oil and gas migration, and oil and gas storage.

[0107] Based on the same inventive concept, an embodiment of the present invention provides a device for identifying a shale diagenetic evolution sequence, which may include: an identification module, for identifying a shale diagenetic evolution sequence based on the distribution of the nuclear magnetic resonance T2 spectrum obtained by nuclear magnetic resonance logging of the target well and the intersection chart of the shale diagenetic evolution sequence;

[0108] The shale diagenetic evolution sequence intersection chart is pre-constructed based on the construction method of the shale diagenetic evolution sequence intersection chart described in Example 1.

[0109] Based on the same inventive concept, an embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned method for identifying the shale diagenetic evolution sequence is implemented.

[0110] Based on the same inventive concept, a computer device is provided in an embodiment of the present invention, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above-mentioned method for identifying the shale diagenetic evolution sequence when executing the program.

[0111] The principles of the problems solved by the above-mentioned devices, clients, media, related equipment and systems in the embodiments of the present invention are similar to those of the above-mentioned methods, so their implementation can refer to the implementation of the above-mentioned methods, and the repeated parts will not be repeated.

[0112] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0113] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the 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.

[0114] 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.

[0115] 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 1The steps for the functions specified in one or more boxes.

[0116] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for constructing a shale diagenetic evolution sequence intersection chart, characterized in that: include: Determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained from coring and logging in the study area; Performing a high-pressure mercury injection experiment on the shale core sample to determine the pore radius distribution of the shale core sample; Based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample, the shale pore type and relative content of the shale core sample are determined; wherein the shale pore type includes: micropores, mesopores and macropores; Based on the shale diagenetic evolution sequence and the shale pore types and contents of the shale core samples, determining the pore types and relative contents in different shale diagenetic evolution sequences; Based on the pore types and their relative contents in different shale diagenetic evolution sequences, an intersection chart of the shale diagenetic evolution sequences is constructed.

2. The method according to claim 1, characterized in that The method of determining the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample comprises: Determine the conversion coefficient between the nuclear magnetic resonance T2 spectrum and the shale pore radius based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; Based on the conversion coefficient, the shale pore type and relative content of the shale core sample are determined using the nuclear magnetic resonance T2 spectrum distribution.

3. The method according to claim 2, characterized in that The method of determining the shale pore type and relative content of the shale core sample based on the conversion coefficient and using the nuclear magnetic resonance T2 spectrum distribution includes: Determining void radius thresholds for different shale pore types based on the conversion coefficient; Based on the void radius thresholds of different shale pore types, the shale pore type and relative content of the shale core sample are determined by the nuclear magnetic resonance T2 spectrum distribution.

4. The method according to claim 1, characterized in that: The shale core samples obtained by coring and logging in the study area are used to determine the diagenetic evolution sequence of the shale in the study area, including: Based on the shale core sample, determining the mineral composition and mineral content of the shale core sample; Based on the mineral composition and the mineral content, the shale diagenetic evolution sequence of the study area is determined.

5. The method according to claim 4, characterized in that Determining the shale diagenetic evolution sequence of the study area based on the mineral composition and the mineral content includes: Determine the mineral content and boundaries in the shale diagenetic evolution sequence based on the vitrinite reflectance, hydrocarbon generation window and maturity of the shale core sample; The shale diagenetic evolution sequence of the study area is determined based on the mineral composition content and boundaries of the determined shale diagenetic evolution sequence and the mineral composition and mineral content of the shale core sample.

6. The method according to any one of claims 1 to 5, characterized in that: After constructing the intersection chart of the shale diagenetic evolution sequence, it also includes: Based on the magnetic resonance T2 spectrum distribution of shale core samples from other coring and logging in the study area, and the pore radius distribution determined by high-pressure mercury injection experiments, the intersection chart of the shale diagenetic evolution sequence is verified.

7. A method for identifying shale diagenetic evolution sequence, characterized in that: include: Based on the distribution of nuclear magnetic resonance T2 spectrum obtained by nuclear magnetic logging of the target well and the intersection chart of shale diagenetic evolution sequence, the shale diagenetic evolution sequence is identified; Wherein, the shale diagenetic evolution sequence intersection map is pre-constructed based on the construction method of the shale diagenetic evolution sequence intersection map according to any one of claims 1 to 6.

8. A device for constructing a shale diagenetic evolution sequence intersection chart, characterized in that: include: A first determination module is used to determine the diagenetic evolution sequence of shale in the study area based on shale core samples obtained by coring and logging in the study area; An acquisition module, used for acquiring the high-pressure mercury injection test result of the shale core sample to determine the pore radius distribution of the shale core sample; A second determination module is used to determine the shale pore type and relative content of the shale core sample based on the pore radius distribution and the nuclear magnetic resonance T2 spectrum distribution of the shale core sample; wherein the shale pore type includes: micropores, mesopores and macropores; A third determination module is used to determine the pore types and relative contents in different shale diagenetic evolution sequences based on the shale diagenetic evolution sequence and the shale pore types and contents of the shale core sample; A construction module is used to construct an intersection chart of the shale diagenetic evolution sequence based on the pore types and their relative contents in different shale diagenetic evolution sequences.

9. A device for identifying shale diagenetic evolution sequence, characterized in that: include: An identification module, used to identify the shale diagenetic evolution sequence based on the distribution of nuclear magnetic resonance T2 spectrum obtained by nuclear magnetic logging of the target well and the intersection chart of the shale diagenetic evolution sequence; Wherein, the shale diagenetic evolution sequence intersection map is pre-constructed based on the construction method of the shale diagenetic evolution sequence intersection map according to any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, it realizes the method for constructing the intersection chart of the shale diagenetic evolution sequence as described in any one of claims 1 to 6, or realizes the method for identifying the shale diagenetic evolution sequence as described in claim 7.

11. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for constructing the shale diagenetic evolution sequence intersection plate according to any one of claims 1 to 6 is implemented, or the method for identifying the shale diagenetic evolution sequence according to claim 7 is implemented.

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