Methods and Systems for Determining Organic Matter Content in Shale

Abstract

This invention provides a method and system for determining the organic matter content of shale. The method includes: determining the mass percentage of each mineral in the clay minerals of the shale sample to be tested; determining the unit mass signal quantity of the shale sample to be tested; and determining the organic matter content in the shale sample to be tested based on the determined mass percentage of each mineral in the clay minerals, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of a unit mass of pure substance. The signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of organic matter and the unit mass signal quantity of each mineral. The method and system for determining the organic matter content of shale provided by this invention utilizes nuclear magnetic resonance (NMR) technology to rapidly determine the organic matter content in shale. By using the NMR signal chart of the determined pure substance, combined with the content of various substances obtained from well logging, the organic matter content in shale can be rapidly determined.

Description

Technical Field

[0001] This invention relates to shale gas exploration technology, specifically a method and system for determining the organic matter content of shale. Background Technology

[0002] Total organic carbon (TOC) in shale reflects the amount of organic matter and hydrocarbon generation potential in gas-bearing shale, and is one of the key parameters for evaluating shale resources.

[0003] Existing methods for determining the total organic carbon content in shale mainly involve analyzing the total organic carbon content of gas-bearing shale using a carbon-sulfur analyzer after removing inorganic carbon from the shale sample. Summary of the Invention

[0004] To provide a method for determining the total organic carbon content in shale, this invention provides a method for determining the organic matter content of shale, comprising:

[0005] Determine the mass percentage of each mineral in the clay minerals of the shale sample to be tested;

[0006] Determine the unit mass signal quantity of the shale sample to be tested;

[0007] The organic matter content in the shale sample to be tested is determined based on the determined mass percentage of each mineral in the clay minerals, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of the unit mass of pure substance; wherein the signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of pure organic matter and the unit mass signal quantity of pure minerals.

[0008] In this embodiment of the invention, the method further includes: pre-treating the shale sample as the shale sample to be tested; which includes:

[0009] The shale sample is ground to a preset mesh size, dried at a preset temperature for a preset time to obtain the shale sample to be tested, and the weight of the shale sample to be tested is determined.

[0010] In this embodiment of the invention, determining the mass percentage of each mineral in the clay minerals of the shale sample to be tested includes:

[0011] X-ray diffraction mineral analysis was performed on the shale sample to determine the mass percentage of each mineral in the clay minerals.

[0012] In this embodiment of the invention, determining the unit mass signal quantity of the shale sample to be tested includes:

[0013] The nuclear magnetic resonance signal quantity of the shale sample under test was determined by CPMG pulse sequence measurement;

[0014] The signal quantity per unit mass of the shale sample to be tested is determined based on the determined nuclear magnetic resonance signal quantity and the mass of the shale sample to be tested.

[0015] In this embodiment of the invention, the determination of the nuclear magnetic resonance signal quantity of the shale sample to be tested using CPMG pulse sequence measurement includes:

[0016] A radio frequency magnetic field of a preset frequency is applied to the shale sample to be tested;

[0017] After applying the radio frequency magnetic field to generate nuclear magnetic resonance, the radio frequency magnetic field is removed to generate a transverse relaxation time signal as the nuclear magnetic resonance signal quantity of the shale sample to be tested.

[0018] In this embodiment of the invention, the preset frequency is the Lamour frequency.

[0019] Meanwhile, the present invention also provides a system for determining the organic matter content of shale, comprising:

[0020] A mass percentage determination device is used to determine the mass percentage of each mineral in the clay minerals of a shale sample to be tested.

[0021] Signal quantity determination device, used to determine the signal quantity per unit mass of the shale sample to be tested;

[0022] An organic matter content determination device is used to determine the organic matter content in a shale sample based on the determined mass percentage of each mineral in the clay mineral, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of a unit mass of pure substance; wherein the signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of organic pure substance and the unit mass signal quantity of each mineral pure substance.

[0023] In this embodiment of the invention, the semaphore determination device includes:

[0024] A nuclear magnetic resonance core analyzer is used to determine the nuclear magnetic resonance signal quantity of the shale sample to be tested by CPMG pulse sequence measurement.

[0025] The signal quantity determination device is used to determine the unit mass signal quantity of the shale sample to be tested based on the determined nuclear magnetic resonance signal quantity of the shale sample to be tested and the mass of the shale sample to be tested.

[0026] In this embodiment of the invention, the nuclear magnetic resonance core analyzer uses CPMG pulse sequence measurement to determine the nuclear magnetic resonance signal quantity of the shale sample to be tested, including:

[0027] A radio frequency magnetic field of a preset frequency is applied to the shale sample to be tested;

[0028] After applying the radio frequency magnetic field to generate nuclear magnetic resonance, the radio frequency magnetic field is removed to generate a transverse relaxation time signal as the nuclear magnetic resonance signal quantity of the shale sample to be tested.

[0029] In this embodiment of the invention, the mass percentage determining device determines the mass percentage of each mineral in the clay minerals of the shale sample to be tested, including:

[0030] X-ray diffraction mineral analysis was performed on the shale sample to determine the mass percentage of each mineral in the clay minerals.

[0031] The present invention provides a method and system for determining the organic matter content of shale. This method utilizes nuclear magnetic resonance (NMR) technology to rapidly determine the organic matter content in shale. By combining the NMR signal charts of the measured pure substances with the contents of various substances obtained from well logging, the organic matter content in shale can be quickly determined.

[0032] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A flowchart of the method for determining the organic matter content of shale provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the online nuclear magnetic resonance detection device in an embodiment of the present invention;

[0036] Figure 3 This is a distribution diagram of T2 signal intensity of different pure mineral unit components in shale according to an embodiment of the present invention;

[0037] Figure 4 The T2 spectrum of the shale powder sample in this embodiment of the invention;

[0038] Figure 5 A block diagram of a shale organic matter content determination system provided in an embodiment of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] This invention provides a method for determining the organic matter content of shale, such as... Figure 1 As shown, the method includes:

[0041] Step S101: Determine the mass percentage of each mineral in the clay minerals of the shale sample to be tested;

[0042] Step S102: Determine the unit mass signal quantity of the shale sample to be tested;

[0043] Step S103: Determine the organic matter content in the shale sample to be tested based on the determined mass percentage of each mineral in the clay mineral, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of the unit mass of pure substance; wherein the signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of organic pure substance and the unit mass signal quantity of each mineral pure substance.

[0044] This invention utilizes well logging technology to estimate the organic carbon content of formations, overcoming the difficulties in evaluating shale caused by insufficient coring and limitations in experimental analysis costs. Nuclear magnetic resonance (NMR) logging is a new logging technology applicable to open-hole wells. It is a logging method that can directly measure the seepage volume characteristics of free fluids (oil, gas, and water) in reservoirs, offering significant advantages. NMR technology utilizes the paramagnetism of atomic nuclei and the external magnetic field interacting with them to quantitatively evaluate the distribution of hydrogen nuclei (¹H) in rocks, and is now widely used in oil and gas research. Shale is a fine-grained clastic sedimentary rock formed from different components of clay minerals, quartz, calcite, and organic matter. The heterogeneity of mineral distribution in shale exhibits different relaxation characteristics in the surface properties of pores. The solids in shale that can generate NMR signals are mainly organic matter and clay minerals, with the organic matter signal primarily originating from hydrogen atoms in organic carbon. Clay minerals include kaolinite, chlorite, illite, montmorillonite, and illite-montmorillonite mixed-layer minerals. The NMR signals of clay minerals are partly due to the presence of hydrogen atoms (1H) within the minerals themselves, and secondly due to the presence of interlayer water and water of crystallization. Current low-field NMR techniques can detect hydrogen atom signals in organic matter and clay mineral molecules within rock cores. The signal intensity is directly proportional to the number of hydrogen atoms in the substance. Therefore, by testing the NMR signal intensity of different pure substances and combining this with the content of each substance, the content of other substances can be obtained.

[0045] In this embodiment of the invention, the signal quantities of different pure substances can be measured in real time during the determination of shale organic matter content. Using equipment and conditions that ensure the same unit mass signal quantity for the shale sample to be tested, the signal quantities of pure shale components are measured using CPMG pulse sequences. Alternatively, the signal quantities of pure substances per unit mass can be determined in advance using other methods. That is, the methods for obtaining the signal quantities of pure substances per unit mass in this embodiment of the invention are not limited to those described in this embodiment. Any method that can obtain the signal quantities of pure substances per unit mass is included within the scope of this embodiment of the invention.

[0046] In this embodiment of the invention, the method further includes: pre-treating the shale sample as the shale sample to be tested; in this embodiment of the invention, the pre-treatment includes:

[0047] The shale sample is ground to a preset mesh size, dried at a preset temperature for a preset time to obtain the shale sample to be tested, and the weight of the shale sample to be tested is determined.

[0048] In one embodiment of the present invention, the shale sample is ground to 60 mesh and dried in a constant temperature oven at 120 degrees Celsius for more than 48 hours to eliminate the interference of moisture and gas, and to obtain data such as weight.

[0049] In this embodiment of the invention, determining the mass percentage of each mineral in the clay minerals of the shale sample to be tested includes:

[0050] X-ray diffraction mineral analysis was performed on the shale sample to determine the mass percentage of each mineral in the clay minerals.

[0051] In one embodiment of the present invention, the clay layer minerals include illite, montmorillonite, kaolinite, chlorite, and a mixed illite-montmorillonite layer, and the organic matter includes kerogen.

[0052] In this embodiment of the invention, determining the unit mass signal quantity of the shale sample to be tested includes:

[0053] The nuclear magnetic resonance signal quantity of the shale sample under test was determined by CPMG pulse sequence measurement;

[0054] The signal quantity per unit mass of the shale sample to be tested is determined based on the determined nuclear magnetic resonance signal quantity and the mass of the shale sample to be tested.

[0055] In this embodiment of the invention, the determination of the nuclear magnetic resonance signal quantity of the shale sample to be tested using CPMG pulse sequence measurement includes:

[0056] A radio frequency magnetic field of a preset frequency is applied to the shale sample to be tested;

[0057] After applying the radio frequency magnetic field to generate nuclear magnetic resonance, the radio frequency magnetic field is removed to generate a transverse relaxation time signal as the nuclear magnetic resonance signal quantity of the shale sample to be tested.

[0058] When a shale sample is placed in a uniform static magnetic field, the clay minerals and their contained hydrogen nuclei (¹H) are polarized by the magnetic field, macroscopically exhibiting a magnetization vector. Applying a radio frequency field of a certain frequency to the sample at this time will generate nuclear magnetic resonance (NMR). Subsequently, removing the radio frequency field reveals a signal whose amplitude decays exponentially with time; the rate of decay is typically described by the transverse relaxation time T². For hydrogen-containing materials, the NMR signal intensity is directly proportional to the total hydrogen content within the sensing volume of the NMR spectrometer's detection coil.

[0059] In this embodiment of the invention, the preset frequency is the Lamour frequency.

[0060] In this embodiment of the invention, the signal intensity per unit mass of pure substance is predetermined to determine the organic matter content in the shale sample to be tested. In this embodiment, CPMG pulse sequences are used to measure the signal intensity of shale pure substance components at different weights, including: kerogen X in organic matter. toc The nuclear magnetic resonance (NMR) signals of kaolinite, chlorite, illite, montmorillonite, and illite-montmorillonite mixed layers in clay minerals were obtained. Normalized NMR signals of different components of shale were acquired, and standard curves of the NMR signals of each pure substance at different masses were established.

[0061] This invention provides a method for rapidly determining the organic matter content in shale using nuclear magnetic resonance (NMR) technology. The method uses a predetermined signal intensity per unit mass of pure substance to determine the organic matter content in the shale sample to be tested. The NMR signal plate of the measured pure substance, combined with the content of various substances obtained from well logging, can quickly determine the organic matter content in the shale.

[0062] The following describes the steps for measuring the organic matter content of shale using nuclear magnetic resonance technology, as provided in this embodiment of the invention, with reference to specific embodiments. The specific steps of this embodiment include:

[0063] 1. Establish NMR signal curves for different pure substances;

[0064] First, obtain NMR signal plates of pure substances in shale that can generate NMR signals, including but not limited to kerogen, illite, montmorillonite, kaolinite, chlorite, illite-montmorillonite mixed layers, etc., that is, the signal quantity of a unit mass of pure substance determined in advance.

[0065] The powdered sample was ground to 60 mesh and dried in a constant temperature oven at 120 degrees Celsius for more than 48 hours to eliminate the interference of moisture and gas, and the weight and other data were obtained.

[0066] After connecting the nuclear magnetic resonance experimental system, in this embodiment, the experimental equipment and its accessories include: a nuclear magnetic resonance full-diameter core analyzer for holding the core, a nuclear magnetic resonance high-temperature and high-pressure probe to generate nuclear magnetic pulse signals, a gas source system for supplying gas, a confining pressure system for applying confining pressure, a computer for data acquisition and corresponding pipelines, pressure sensors and switches, etc.

[0067] When a shale sample is placed in a uniform static magnetic field, the clay minerals and the contained hydrogen nuclei (¹H) are polarized by the magnetic field, macroscopically exhibiting a magnetization vector. Applying a radio frequency field (Ramohr frequency) to the sample at this time will generate nuclear magnetic resonance (NMR). After removing the radio frequency field, a signal whose amplitude decays exponentially with time can be received; the rate of decay is generally described by the transverse relaxation time T². For hydrogen-containing materials, the NMR signal intensity is directly proportional to the total hydrogen content within the sensing volume of the NMR spectrometer's detection coil.

[0068] The signal quantities of pure shale material components at different weights were measured using CPMG pulse sequences, including kerogen X in organic matter. toc The nuclear magnetic resonance (NMR) signals of kaolinite, chlorite, illite, montmorillonite, and illite-montmorillonite mixed layers in clay minerals were obtained. The normalized NMR signals of different components of shale were acquired, and standard curves of the signals under different masses of each pure substance were established.

[0069] like Figure 2 As shown, in one embodiment of the present invention, the nuclear magnetic resonance T2 spectra of different components of shale after normalization are obtained.

[0070] 2. Perform nuclear magnetic resonance (NMR) testing on the sample to obtain the organic matter content.

[0071] Shale samples are pretreated to prepare them for testing. Specifically, the shale samples are dried in a constant temperature oven at 120 degrees Celsius for more than 48 hours. For example, X-ray diffraction mineral analysis is used to measure the total clay mineral content M in the shale powder sample, as well as the contents of kaolinite M1, chlorite M2, illite M3, montmorillonite M4, and illite-montmorillonite mixed layer M5 in the clay minerals, where M = M1 + M2 + M3 + M4 + M5.

[0072] Shale powder samples were ground to 60 mesh and dried in a constant temperature oven at 120 degrees Celsius for more than 48 hours to eliminate the interference of moisture and gas, and the weight and other data were obtained.

[0073] After connecting the nuclear magnetic resonance experimental system, using the same equipment parameters as in step 1 above, the signal quantity T of the shale columnar sample was measured using a CPMG pulse sequence. total As analyzed above, the total signal quantity is generated by hydrogen-containing substances in clay minerals and organic matter. Therefore:

[0074] T total =χToc ·m toc +M1·T1+M2·T2+M3·T3+M4·T4+M5·T5 (1)

[0075] Among them, T total This represents the total signal quantity per unit mass of the target sample; m TOC χ² represents the content of organic matter. Toc M represents the signal quantity per unit mass of organic matter. i T represents the content of the i-th mineral in the clay mineral. i This represents the unit mass signal quantity of the i-th mineral in the clay mineral.

[0076] According to the above formula, the total signal of organic matter is obtained by subtracting the total signal of the corresponding clay mineral component from the total signal of shale. Then, the organic matter signal is obtained by comparing it with the organic matter standard curve, and the organic matter content is determined according to the following formula.

[0077]

[0078] Specifically, the steps for determining the organic matter content in this embodiment of the invention are as follows:

[0079] (1) According to Figure 3 As shown, connect the experimental apparatus, check the airtightness of the system, and then dry the shale core and different pure material components in an oven at 120°C for 48 hours.

[0080] (2) Using a connected nuclear magnetic resonance experimental system, CPMG pulse sequences were used to measure the nuclear magnetic resonance signals of pure shale components including kerogen, kaolinite, chlorite, illite, and montmorillonite. Normalized T2 NMR spectra of different shale components were obtained. Figure 2 ).

[0081] The signal quantity per unit mass of pure substance obtained in this embodiment includes: illite T 信号量 The value is 274.8, montmorillonite T. 信号量 354.3; Chlorite T 信号量 It is 273.7; Kaolinite T 信号量 It is 107.5; Kerogen T 信号量 It is 66.5;

[0082] (3) The total content of clay minerals in shale columnar samples and the content of kaolinite, chlorite, illite and montmorillonite in clay minerals were measured by X-ray diffraction mineral analysis.

[0083] The X-ray diffraction mineral analysis results in this embodiment are as follows:

[0084] The clay mineral content percentage was 63.7%, of which illite accounted for 36.9%, montmorillonite for 7%, and chlorite for 19.8%. The sample in this embodiment did not contain kaolinite.

[0085] (4) The T2 spectrum of columnar shale was obtained by nuclear magnetic resonance testing, such as... Figure 4 As shown, the total semaphore T is obtained. 2total The value is 1460.5, the core mass is 7.93g, and the converted signal quantity per unit mass is T. total It is 184.17;

[0086] (5) The organic matter (i.e., kerogen) content was calculated using Formula 2 as follows:

[0087] (184.17-0.369×274.8-0.07×354.3-0.198×273.7) / 66.5=5.7%.

[0088] This invention utilizes well logging technology to estimate the organic carbon content of formations, overcoming the difficulties in evaluating shale caused by insufficient coring and limitations in experimental analysis costs. Nuclear magnetic resonance (NMR) logging is a new logging technology applicable to open-hole wells. It is a logging method that can directly measure the seepage volume characteristics of free fluids (oil, gas, and water) in reservoirs, offering significant advantages. NMR technology utilizes the paramagnetism of atomic nuclei and the external magnetic field interacting with them to quantitatively evaluate the distribution of hydrogen nuclei (¹H) in rocks, and is now widely used in oil and gas research. Shale is a fine-grained clastic sedimentary rock formed from different components of clay minerals, quartz, calcite, and organic matter. The heterogeneity of mineral distribution in shale exhibits different relaxation characteristics in the surface properties of pores. The solids in shale that can generate NMR signals are mainly organic matter and clay minerals, with the organic matter signal primarily originating from hydrogen atoms in organic carbon. Clay minerals include kaolinite, chlorite, illite, montmorillonite, and illite-montmorillonite mixed-layer minerals. The NMR signals of clay minerals are partly due to the presence of hydrogen atoms (1H) within the minerals themselves, and secondly due to the presence of interlayer water and water of crystallization. Current low-field NMR techniques can detect hydrogen atom signals in organic matter and clay mineral molecules within rock cores. The signal intensity is directly proportional to the number of hydrogen atoms in the substance. Therefore, by testing the NMR signal intensity of different pure substances and combining this with the content of each substance, the content of other substances can be obtained.

[0089] Meanwhile, the present invention also provides a system for determining the organic matter content of shale, such as... Figure 5 The diagram shown is a block diagram of the shale organic matter content determination system provided by the present invention, which includes:

[0090] Mass percentage determining device 401 is used to determine the mass percentage of each mineral in the clay minerals in the shale sample to be tested.

[0091] Signal quantity determination device 402 is used to determine the unit mass signal quantity of the shale sample to be tested;

[0092] The organic matter content determination device 403 is used to determine the organic matter content in the shale sample to be tested based on the determined mass percentage of each mineral in the clay mineral, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of the unit mass of pure substance; wherein the signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of pure organic matter and the unit mass signal quantity of pure minerals.

[0093] In this embodiment of the invention, the semaphore determination device includes:

[0094] A nuclear magnetic resonance core analyzer is used to determine the nuclear magnetic resonance signal quantity of the shale sample to be tested by CPMG pulse sequence measurement.

[0095] The signal quantity determination device is used to determine the unit mass signal quantity of the shale sample to be tested based on the determined nuclear magnetic resonance signal quantity of the shale sample to be tested and the mass of the shale sample to be tested.

[0096] In this embodiment of the invention, the nuclear magnetic resonance core analyzer uses CPMG pulse sequence measurement to determine the nuclear magnetic resonance signal quantity of the shale sample to be tested, including:

[0097] A radio frequency magnetic field of a preset frequency is applied to the shale sample to be tested;

[0098] After applying the radio frequency magnetic field to generate nuclear magnetic resonance, the radio frequency magnetic field is removed to generate a transverse relaxation time signal as the nuclear magnetic resonance signal quantity of the shale sample to be tested.

[0099] In this embodiment of the invention, the mass percentage determining device determines the mass percentage of each mineral in the clay minerals of the shale sample to be tested, including:

[0100] X-ray diffraction mineral analysis was performed on the shale sample to determine the mass percentage of each mineral in the clay minerals.

[0101] The present invention provides a method and system for determining the organic matter content of shale. This method utilizes nuclear magnetic resonance (NMR) technology to rapidly determine the organic matter content in shale. By combining the NMR signal charts of the measured pure substances with the contents of various substances obtained from well logging, the organic matter content in shale can be quickly determined.

[0102] Preferred embodiments of the invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

[0103] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0104] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0105] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0106] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0107] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for determining the organic matter content of shale, characterized in that, The method includes: Pretreatment of shale samples as shale samples to be tested includes: The shale sample is ground to a preset mesh size, dried at a preset temperature for a preset time to obtain the shale sample to be tested, and the weight of the shale sample to be tested is determined. Determine the mass percentage of each mineral in the clay minerals of the shale sample to be tested; Determine the unit mass signal quantity of the shale sample to be tested; The organic matter content in the shale sample to be tested is determined based on the determined mass percentage of each mineral in the clay mineral, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of the unit mass of pure substance; wherein the signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of organic pure substance and the unit mass signal quantity of mineral pure substance. The determination of the unit mass signal quantity of the shale sample to be tested includes: The nuclear magnetic resonance signal quantity of the shale sample under test was determined by CPMG pulse sequence measurement; The signal quantity per unit mass of the shale sample to be tested is determined based on the determined nuclear magnetic resonance signal quantity and the mass of the shale sample to be tested. The determination of the nuclear magnetic resonance signal quantity of the shale sample under test using CPMG pulse sequence measurement includes: A radio frequency magnetic field of a preset frequency is applied to the shale sample to be tested; After applying the radio frequency magnetic field to generate nuclear magnetic resonance, the radio frequency magnetic field is removed to generate a transverse relaxation time signal as the nuclear magnetic resonance signal quantity of the shale sample to be tested.

2. The method for determining the organic matter content of shale as described in claim 1, characterized in that, The determination of the mass percentage of each mineral in the clay minerals of the shale sample to be tested includes: X-ray diffraction mineral analysis was performed on the shale sample to determine the mass percentage of each mineral in the clay minerals.

3. The method for determining the organic matter content of shale as described in claim 1, characterized in that, The preset frequency is the Lamour frequency.

4. A system for determining the organic matter content of shale, characterized in that, The system includes: A mass percentage determination device is used to determine the mass percentage of each mineral in the clay minerals of a shale sample to be tested. Signal quantity determination device, used to determine the signal quantity per unit mass of the shale sample to be tested; An organic matter content determination device is used to determine the organic matter content in a shale sample based on the determined mass percentage of each mineral in the clay mineral, the unit mass signal quantity of the shale sample to be tested, and the pre-determined signal quantity of a unit mass of pure substance; wherein the signal quantity of the unit mass of pure substance includes: the unit mass signal quantity of pure organic matter and the unit mass signal quantity of pure minerals. The semaphore determination device includes: A nuclear magnetic resonance core analyzer is used to determine the nuclear magnetic resonance signal quantity of the shale sample to be tested by CPMG pulse sequence measurement. The signal quantity determination device is used to determine the unit mass signal quantity of the shale sample to be tested based on the determined nuclear magnetic resonance signal quantity of the shale sample to be tested and the mass of the shale sample to be tested. The nuclear magnetic resonance core analyzer described above uses CPMG pulse sequence measurements to determine the nuclear magnetic resonance signal quantity of the shale sample to be tested, including: A radio frequency magnetic field of a preset frequency is applied to the shale sample to be tested; After applying the radio frequency magnetic field to generate nuclear magnetic resonance, the radio frequency magnetic field is removed to generate a transverse relaxation time signal as the nuclear magnetic resonance signal quantity of the shale sample to be tested. The system is also specifically used for: pre-processing shale samples as shale samples to be tested; it includes: The shale sample is ground to a preset mesh size, dried at a preset temperature for a preset time to obtain the shale sample to be tested, and the weight of the shale sample to be tested is determined.

5. The shale organic matter content determination system as described in claim 4, characterized in that, The mass percentage determination device determines the mass percentage of each mineral in the clay minerals of the shale sample to be tested, including: X-ray diffraction mineral analysis was performed on the shale sample to determine the mass percentage of each mineral in the clay minerals.

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