Method for acquiring content of original free hydrocarbon in lacustrine facies mixing type carbonate shale oil geochemical logging

Abstract

The invention provides a method for acquiring the content of original free hydrocarbons in shale oil geochemical logging of lacustrine facies mixed carbonatite. The method comprises the following steps: acquiring the dominant lithology of to-be-measured lacustrine facies mixed carbonatite and the free hydrocarbon content of the dominant lithology at the standing time T after the lacustrine facies mixed carbonatite is taken out of a cylinder; according to the free hydrocarbon content of the dominant lithology at the T moment and a preset free hydrocarbon loss recovery model, the original free hydrocarbon content of the dominant lithology is obtained, and obtaining of the original free hydrocarbon content of the lacustrine facies mixing type carbonate rock shale oil geochemical logging is completed. According to the method, by analyzing the dominant lithology and combining the free hydrocarbon loss recovery model, the original free hydrocarbon content of the dominant lithology is obtained, and free hydrocarbon loss correction under different lithology is more scientific and reasonable. The free hydrocarbon loss recovery model established by the method is good in adaptability, high in accuracy, good in precision and easy to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of free hydrocarbon correction methods for geochemical logging, and relates to a method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging. Background Art

[0002] Shale oil is an important component of unconventional energy. Laminated gray-dolomite shale and layered gray-dolomite shale in lacustrine mixed carbonate rocks are shale oil-rich reservoirs. The sources of geochemical logging analysis samples mainly include three sampling methods: cuttings logging, sidewall coring and drilling coring. In the process of cuttings logging sampling, the cuttings are affected by factors such as drilling fluid flushing during the process of returning to the wellhead, resulting in the greatest loss of free hydrocarbons and the least accurate measurement; sidewall coring sampling has a lower degree of free hydrocarbon loss than cuttings logging samples; drilling coring samples have the least free hydrocarbon loss and are closest to the free hydrocarbon content of the original formation. Therefore, it is most appropriate to select drilling coring samples for geochemical logging analysis. After drilling and coring, there is a lack of analysis equipment for logging on-site. In order to ensure the integrity of the core, most logging sites cannot conduct geochemical analysis in time. Instead, the core is sampled and geochemically analyzed after being left to stand for a few days (including the transportation process, etc.), resulting in low free hydrocarbon analysis values ​​that cannot represent the free hydrocarbon content of the original formation. At present, the research on free hydrocarbon loss correction in shale oil geochemical logging is mainly aimed at mud shale, and most of them are based on empirical plates, critical point analysis, and univariate linear regression methods. These methods are greatly affected by human factors, and the correction effect is not good. In addition, correction for free hydrocarbons in mixed carbonate rocks is rarely proposed. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a method for obtaining the original free hydrocarbon content in lacustrine mixed-deposition carbonate shale oil geochemical logging, thereby solving the technical problem in the prior art that free hydrocarbons in mixed-deposition carbonate rocks cannot be corrected.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging comprises the following steps:

[0006] Obtain the dominant lithology of the lacustrine mixed-deposition carbonate rock to be tested and the free hydrocarbon content of the dominant lithology at the time T after the rock is discharged from the cylinder;

[0007] According to the free hydrocarbon content of the dominant lithology at the time T and the preset free hydrocarbon loss recovery model, the original free hydrocarbon content of the dominant lithology is obtained, and the original free hydrocarbon content of the lacustrine mixed carbonate shale oil geochemical logging is completed.

[0008] Preferably, the dominant lithology includes laminated lime-dolomitic shale and layered lime-dolomitic shale.

[0009] Preferably, when the dominant lithology is laminar limestone shale, the preset free hydrocarbon loss recovery model is:

[0010] S 纹层状原始 =S 纹层状，T / e -aT

[0011] In the formula,

[0012] S 纹层状原始 is the original free hydrocarbon content of the laminated limestone;

[0013] S 纹层状，T is the free hydrocarbon content of the laminated gray-dolomitic shale at the time T after the core is left to stand after being taken out of the barrel;

[0014] a is a constant;

[0015] T is the time when the core is left to stand after exiting the barrel.

[0016] Preferably, when the dominant lithology is laminated lime-dolomitic shale, the process of establishing the preset free hydrocarbon loss recovery model is specifically as follows:

[0017] Obtaining the original free hydrocarbon content of laminated gray-dolomitic shale;

[0018] The cores are left at room temperature for several hours, and the free hydrocarbon content of the laminated gray-dolomitic shale is measured at different time points;

[0019] The model of the original free hydrocarbon content of the laminated lime-dolomitic shale and the free hydrocarbon content of the laminated lime-dolomitic shale at the time T after the core is left standing after being taken out of the barrel is established by nonlinear regression analysis method.

[0020] Preferably, when the dominant lithology is layered lime-dolomitic shale, the preset free hydrocarbon loss recovery model is:

[0021] S 层状原始 =S 层状，T +f(φ)

[0022] In the formula,

[0023] S 层状原始 is the original free hydrocarbon content of the layered limestone;

[0024] S 层状，T is the free hydrocarbon content of the layered limestone at the time T after the core is left to stand after exiting the barrel;

[0025] f(φ) is the relationship between the lost free hydrocarbon content and the porosity value φ of the sample to be tested.

[0026] Preferably, when the dominant lithology is layered lime-dolomitic shale, the process of establishing the preset free hydrocarbon loss recovery model is specifically as follows:

[0027] Obtaining the original free hydrocarbon content of layered lime-dolomitic shales;

[0028] The samples were subjected to oil washing treatment and the free hydrocarbon values ​​lost by the layered grey-dolomitic shale were obtained;

[0029] Obtain the porosity value of the sample, and establish a function model between the lost free hydrocarbon value and the porosity value through linear regression analysis;

[0030] A model was established for the original free hydrocarbon content of layered lime-dolomitic shale and the free hydrocarbon content of layered lime-dolomitic shale at time T after the core was taken out of the barrel.

[0031] Preferably, the free hydrocarbon content of the dominant lithology of the lacustrine mixed carbonate rock core to be tested after being left to stand for T time after being taken out of the barrel is obtained by a geochemical analyzer.

[0032] A system for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging, comprising:

[0033] A data acquisition unit, the data acquisition unit is used to obtain the free hydrocarbon content measured at the time T after the core of the laminated lime-dolomite shale and the layered lime-dolomite shale in the lacustrine mixed carbonate rock is left to stand for a period of time after leaving the core out of the barrel;

[0034] A data processing unit, the data processing unit is used to obtain the original free hydrocarbon content of the dominant lithology according to the free hydrocarbon content of the dominant lithology at the time T and a preset free hydrocarbon loss recovery model, and complete the acquisition of the original free hydrocarbon content of the lacustrine mixed carbonate shale oil geochemical logging.

[0035] A terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0036] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0037] Compared with the prior art, the present invention has the following beneficial technical effects:

[0038] The present invention provides a method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging. By analyzing the dominant lithology and combining the free hydrocarbon loss recovery model, the original free hydrocarbon content of the dominant lithology is obtained, and the free hydrocarbon loss correction under different lithologies is more scientific and reasonable. The free hydrocarbon loss recovery model established by the present invention has good adaptability, high accuracy, good precision and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a schematic flow chart of a method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging in the present invention;

[0041] Figure 2 Well logging diagrams of laminated gray-dolomitic shale and layered gray-dolomitic shale in a certain area;

[0042] Figure 3 This is a curve fitting diagram of free hydrocarbon S1 and standing time T in the oil-bearing core (oil-bearing level is fluorescence and oil spots) of laminated gray-dolomitic shale in a certain area;

[0043] Figure 4 The free hydrocarbon value of the oil-bearing core (oil content is fluorescence and oil spots) of the lamellar layered gray-dolomitic shale in a well in the area was measured just out of the barrel and after standing for 5 days. Figure 3 The curve fitting diagram of the free hydrocarbon value after the relationship is restored, the square points in the figure are the restored values, and the straight line is the fitting curve;

[0044] Figure 5 It is a curve fitting diagram of the free hydrocarbon S1 loss and porosity φ of the oil-bearing core (oil-bearing level is fluorescence and oil spots) of the layered gray-dolomitic shale in a certain area;

[0045] Figure 6 The free hydrocarbon S1 value of the oil-bearing core (oil content is fluorescence and oil spots) of the layered gray-dolomitic shale in a well in the area just out of the tube is compared with the free hydrocarbon S1 value after standing for 5 days. Figure 3 The curve fitting diagram after the relationship is restored. The dots in the diagram are the restored values ​​and the straight line is the fitting curve.

[0046] Figure 7 The present invention is a schematic diagram of the structure of a system for obtaining the original free hydrocarbon content in lacustrine mixed carbonate shale oil geochemical logging. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0051] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0052] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0054] like Figure 1 As shown, the present invention provides a method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging, comprising the following steps:

[0055] The dominant lithology of the lacustrine mixed carbonate rock to be tested and the free hydrocarbon content of the dominant lithology after being left standing for T time after being taken out of the barrel are obtained; specifically, the free hydrocarbon content of the dominant lithology of the lacustrine mixed carbonate rock core to be tested after being left standing for T time after being taken out of the barrel is obtained by a geochemical analyzer.

[0056] According to the free hydrocarbon content of the dominant lithology at the time T and the preset free hydrocarbon loss recovery model, the original free hydrocarbon content of the dominant lithology is obtained, and the original free hydrocarbon content of the lacustrine mixed carbonate shale oil geochemical logging is completed.

[0057] In practice, the dominant lithologies mainly include laminated lime-dolomitic shale and layered lime-dolomitic shale.

[0058] When the dominant lithology is laminar lime-dolomitic shale, the preset free hydrocarbon loss recovery model is:

[0059] S 纹层状原始 =S 纹层状测量 / e -aT

[0060] In the formula,

[0061] S 纹层状原始 is the original free hydrocarbon content of the laminated limestone;

[0062] S 纹层状测量 is the free hydrocarbon content of the laminated gray-dolomitic shale at the time T after the core is left to stand after being taken out of the barrel;

[0063] a is a constant;

[0064] T is the time when the core is left to stand after exiting the barrel.

[0065] When the dominant lithology is laminar lime-dolomitic shale, the establishment process of the preset free hydrocarbon loss recovery model is specifically as follows:

[0066] Obtaining the original free hydrocarbon content of laminated gray-dolomitic shale;

[0067] The cores are left at room temperature for several hours, and the free hydrocarbon content of the laminated gray-dolomitic shale is measured at different time points;

[0068] The model of the original free hydrocarbon content of the laminated lime-dolomitic shale and the free hydrocarbon content of the laminated lime-dolomitic shale at the time T after the core is left standing after being taken out of the barrel is established by nonlinear regression analysis method.

[0069] When the dominant lithology is layered lime-dolomitic shale, the preset free hydrocarbon loss recovery model is:

[0070] S 层状原始 =S 层状测量 +f(φ)

[0071] In the formula,

[0072] S 层状原始 is the original free hydrocarbon content of the layered limestone;

[0073] S 层状测量 is the free hydrocarbon content of the layered limestone at the time T after the core is left to stand after exiting the barrel;

[0074] f(φ) is the relationship between the lost free hydrocarbon content and the porosity value φ of the sample to be tested.

[0075] When the dominant lithology is layered lime-dolomitic shale, the establishment process of the preset free hydrocarbon loss recovery model is specifically as follows:

[0076] Obtaining the original free hydrocarbon content of layered lime-dolomitic shales;

[0077] The samples were subjected to oil washing treatment and the free hydrocarbon values ​​lost by the layered grey-dolomitic shale were obtained;

[0078] Obtain the porosity value of the sample, and establish a function model between the lost free hydrocarbon value and the porosity value through linear regression analysis;

[0079] A model was established for the original free hydrocarbon content of layered lime-dolomitic shale and the free hydrocarbon content of layered lime-dolomitic shale at time T after the core was taken out of the barrel.

[0080] The present invention provides a method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging. The original free hydrocarbon content of the dominant lithology is obtained by analyzing the dominant lithology and combining the free hydrocarbon loss recovery model. The correction of free hydrocarbon loss under different lithologies is more scientific and reasonable. For laminated gray-dolomite shale, the relationship between free hydrocarbons in the core and time is established according to the recovery model. When establishing the relationship, the regression analysis method in data mining is used. By using the nonlinear regression analysis method, the functional relationship between the measured value and the original value is established, and finally the original free hydrocarbon content of the formation is obtained, and the free hydrocarbon loss recovery correction is realized; for layered gray-dolomite shale, the relationship between the free hydrocarbon loss in the core and porosity is established according to the recovery model. When establishing the relationship, the regression analysis method in data mining is used. By using the linear regression analysis method, the functional relationship between the measured value and the original value is established, and finally the original free hydrocarbon content of the formation is obtained, and the free hydrocarbon loss recovery correction is realized. The correction of free hydrocarbon loss under different lithologies is more scientific and reasonable. In the past, the empirical plate method and univariate linear regression commonly used in shale to recover hydrocarbon loss were greatly affected by human factors. At the same time, the univariate linear regression analysis method was relatively simple and incomplete. The free hydrocarbon loss recovery model established by this method has good adaptability, high accuracy, good precision and is easy to operate.

[0081] Example 2

[0082] In order to further explain the present invention, this embodiment is described.

[0083] A correction method for free hydrocarbon S1 in lacustrine mixed carbonate shale oil geochemical logging, comprising:

[0084] Step 1: Identify the lithology of lacustrine mixed carbonate rocks, use X-ray diffraction analysis, element logging, and lithology scanning logging to identify the main lithology, use resistivity imaging logging to determine the lithology structure and structural characteristics, and identify the dominant reservoir lithology as laminated gray-dolomite shale and layered gray-dolomite shale;

[0085] Step 2: Use YQ-Ⅷ geochemical analyzer to analyze the core just out of the barrel to obtain the geochemical analysis parameters of laminar and layered gray-dolomitic shale cores, free hydrocarbon S 纹层状原始 and S 层状原始 Value, at this time S 纹层状原始 and S 层状原始 The value is closest to the original hydrocarbon content of the formation;

[0086] Step 3: For the laminar gray-dolomitic shale samples, the free hydrocarbon S of the laminar gray-dolomitic shale geochemical analysis parameters is measured at different time points of 1 hour, 2 hours, 5 hours, 10 hours, 24 hours, 120 hours, and 240 hours at room temperature. 纹层状，T The value of

[0087] Step 4: Establish the free hydrocarbon value S in the laminated gray-dolomitic shale by nonlinear regression analysis method. 纹层状，T The scattered point relationship that changes with time is established. 纹层状，T With S 纹层状原始 And the functional relationship with time T:

[0088] S 纹层状原始 =S 纹层状，T / e -aT

[0089] In the formula,

[0090] S 纹层状原始 is the original free hydrocarbon content of the laminated limestone, mg / g;

[0091] S 纹层状，T is the free hydrocarbon content of the laminar gray-dolomitic shale at the time T after the core is taken out of the barrel, mg / g;

[0092] a is a constant, which can be obtained by function fitting;

[0093] T is the time the core is left to rest after exiting the barrel, h.

[0094] Step 5: For the layered lime-dolomitic shale samples, the YQ-VIII geochemical analyzer is used to analyze the geochemical analysis parameters of the layered lime-dolomitic shale core just out of the tube. 层状原始 value;

[0095] Step 6: Wash each sample with oil to fully remove the free hydrocarbon value ΔS that is easy to lose 层状 The porosity value φ of each sample was measured by nuclear magnetic resonance instrument, and ΔS was established by linear regression analysis. 层状 Functional relationship between ΔS and φ: 层状 =f(φ), thus establishing the functional relationship between the original value of free hydrocarbons in layered lime-dolomitic shale and porosity:

[0096] S 层状原始 =S 层状，T +f(φ)

[0097] In the formula,

[0098] S 层状原始 is the original free hydrocarbon content of the layered limestone, mg / g;

[0099] S 层状，T is the free hydrocarbon content of the layered limestone at the time T after the core is left to stand after being taken out of the barrel, mg / g;

[0100] f(φ) is the relationship between the lost free hydrocarbon content and the porosity value φ of the sample to be tested, which can be obtained by data fitting;

[0101] φ is the porosity of the layered dolomitic shale test sample in %.

[0102] Example 3

[0103] Furthermore, the method of the present invention is further explained using the data of a well in a certain area. The well logging diagrams of the laminated lime-dolomitic shale and the layered lime-dolomitic shale in the area are shown in FIG. Figure 2 Specifically, cores were obtained from the upper strata of a well in a certain area for testing. The source of the geochemical logging free hydrocarbon S1 parameter of the laminar gray-dolomitic shale and layered gray-dolomitic shale core samples was the analysis result of the YQ-Ⅷ type geochemical analyzer. A total of 36 oil-bearing core samples (oil content level is fluorescence and oil spots) were analyzed, including 12 laminar gray-dolomitic shale core samples. The free hydrocarbon values ​​S1 of the 12 samples were measured when they were just out of the barrel. 纹层状原始 After the sample was left to stand for 5 days, the free hydrocarbon value S of the sample was measured. 纹层状，5天 , where the fitting relationship between different standing times and free hydrocarbon measurements is shown in Figure 3 , S 纹层状，5天 Substitute the value into the recovery formula of free hydrocarbons in the laminated gray-dolomitic shale core:

[0104] S 纹层状原始 =S 纹层状，T / e -aT

[0105] The calculated S 纹层状原始 Fitting with the measured raw free hydrocarbon values ​​(see Figure 4 ),from Figure 4 It can be seen that the calculated S 纹层状原始 , that is, the free hydrocarbon recovery value of laminated lime-dolomitic shale ( Figure 4 The horizontal axis is compared with the actual measured original free hydrocarbon value, that is, the original free hydrocarbon value of the laminated lime-dolomitic shale ( Figure 4 ordinate), there are some deviations, but the overall trend is basically consistent, and the calculation model can meet the demand for free hydrocarbons in the core of laminated gray-dolomitic shale;

[0106] Among the samples, there are 24 layered gray-dolomitic shale core samples. The porosity φ of the 24 core samples was first measured using a nuclear magnetic resonance instrument. Among them, the free hydrocarbon loss ΔS 层状 The curve fitting diagram of porosity φ is shown in Figure 5 Then measure the free hydrocarbon value S of 24 samples just out of the barrel. 1层状原始 After the sample was left to stand for 5 days, the free hydrocarbon value S of the sample was measured. 层状，5天 , S 层状，5天 Substitute the value into the recovery formula of free hydrocarbons in layered lime-dolomitic shale core:

[0107] S 层状原始 =S 层状，T +f(φ)

[0108] The calculated S 层状原始 Fitting with the actual measured raw free hydrocarbon values ​​(see Figure 6 ),from Figure 6 It can be seen that the calculated S 层状原始 , that is, the free hydrocarbon recovery value of layered lime-dolomitic shale ( Figure 6 The horizontal axis is compared with the actual measured original free hydrocarbon value, that is, the original free hydrocarbon value of the layered lime-dolomitic shale ( Figure 6 ordinate), there are some deviations, but the overall trend is basically consistent, and the calculation model can meet the demand for free hydrocarbons in the layered gray-dolomitic shale core;

[0109] pass Figure 4 and Figure 6 The fitting of the recovered value and the original value revealed that there was a very good correlation between the free hydrocarbon calculation results calculated by the recovery formula of the invention and the original value of free hydrocarbon in the core sample, thus verifying the accuracy of the calculation results of a correction calculation model for free hydrocarbon S1 in lacustrine mixed carbonate shale oil geochemical logging.

[0110] Example 4

[0111] like Figure 7 As shown, the present invention also provides a system for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging, comprising:

[0112] A data acquisition unit, the data acquisition unit is used to obtain the free hydrocarbon content measured at the time T after the core of the laminated lime-dolomite shale and the layered lime-dolomite shale in the lacustrine mixed carbonate rock is left to stand for a period of time after leaving the core out of the barrel;

[0113] A data processing unit, the data processing unit is used to obtain the original free hydrocarbon content of the dominant lithology according to the free hydrocarbon content of the dominant lithology at the time T and a preset free hydrocarbon loss recovery model, and complete the acquisition of the original free hydrocarbon content of the lacustrine mixed carbonate shale oil geochemical logging.

[0114] Further, a schematic diagram of a terminal device provided in an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in the above-mentioned device embodiments are implemented.

[0115] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0116] The terminal device may be a computing device such as a desktop computer, a notebook, a palmtop computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0117] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0118] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0119] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0120] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging, characterized in that: The following steps are involved: Obtain the dominant lithology of the lacustrine mixed-accretion type carbonate rock to be tested and the free hydrocarbon content of the dominant lithology at the time T after leaving the cylinder; According to the free hydrocarbon content of the dominant lithology at the time T and the preset free hydrocarbon loss recovery model, the original free hydrocarbon content of the dominant lithology is obtained, and the original free hydrocarbon content of the lacustrine mixed carbonate shale oil geochemical logging is completed.

2. The method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging according to claim 1, characterized in that: The dominant lithology includes laminated gray-dolomite shale and layered gray-dolomite shale.

3. The method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging according to claim 2, characterized in that: When the dominant lithology is laminar lime-dolomitic shale, the preset free hydrocarbon loss recovery model is: S 纹层状原始 =S 纹层状，T / e -aT In the formula, S 纹层状原始 is the original free hydrocarbon content of the laminated limestone; S 纹层状，T is the free hydrocarbon content of the laminated gray-dolomitic shale at the time T after the core is left to stand after being taken out of the barrel; a is a constant; T is the time when the core is left to stand after exiting the barrel.

4. The method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging according to claim 3, characterized in that: When the dominant lithology is laminar lime-dolomitic shale, the establishment process of the preset free hydrocarbon loss recovery model is specifically as follows: Obtaining the original free hydrocarbon content of laminated gray-dolomitic shale; The cores are left at room temperature for several hours, and the free hydrocarbon content of the laminated gray-dolomitic shale is measured at different time points; The model of the original free hydrocarbon content of the laminated lime-dolomitic shale and the free hydrocarbon content of the laminated lime-dolomitic shale at the time T after the core is left standing after being taken out of the barrel is established by nonlinear regression analysis method.

5. The method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging according to claim 1, characterized in that: When the dominant lithology is layered lime-dolomitic shale, the preset free hydrocarbon loss recovery model is: S 层状原始 =S 层状，T +f(φ) In the formula, S 层状原始 is the original free hydrocarbon content of the layered limestone; S 层状，T is the free hydrocarbon content of the layered limestone at the time T after the core is left to stand after exiting the barrel; f(φ) is the relationship between the lost free hydrocarbon content and the porosity value φ of the sample to be tested.

6. The method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging according to claim 5, characterized in that: When the dominant lithology is layered lime-dolomitic shale, the establishment process of the preset free hydrocarbon loss recovery model is specifically as follows: Obtaining the original free hydrocarbon content of layered lime-dolomitic shales; The samples were subjected to oil washing treatment and the free hydrocarbon values ​​lost by the layered grey-dolomitic shale were obtained; Obtain the porosity value of the sample, and establish a function model between the lost free hydrocarbon value and the porosity value through linear regression analysis; A model was established for the original free hydrocarbon content of layered lime-dolomitic shale and the free hydrocarbon content of layered lime-dolomitic shale at time T after the core was taken out of the barrel.

7. The method for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging according to claim 1, characterized in that: The free hydrocarbon content of the dominant lithology at the time T after the core of the lacustrine mixed carbonate rock to be tested is left to stand after being taken out of the barrel is obtained by a geochemical analyzer.

8. A system for obtaining the original free hydrocarbon content of lacustrine mixed carbonate shale oil geochemical logging, characterized in that: include: A data acquisition unit, the data acquisition unit is used to obtain the free hydrocarbon content measured at the time T after the core of the laminated lime-dolomite shale and the layered lime-dolomite shale in the lacustrine mixed carbonate rock is left to stand for a period of time after leaving the core out of the barrel; A data processing unit, the data processing unit is used to obtain the original free hydrocarbon content of the dominant lithology according to the free hydrocarbon content of the dominant lithology at the time T and a preset free hydrocarbon loss recovery model, and complete the acquisition of the original free hydrocarbon content of the lacustrine mixed carbonate shale oil geochemical logging.

9. A terminal 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 computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

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

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