阅读说明：本技术 一种利用测井资料计算页岩油储层含油量的方法 (Method for calculating oil content of shale oil reservoir by using logging information ) 是由 万宇 聂昕 张超谟 张占松 张冲 方思南 于 2021-07-12 设计创作，主要内容包括：本发明公开了一种利用测井资料计算页岩油储层含油量的方法,包括：获取页岩油储层的干酪根体积分数；获取页岩油储层的总有机碳体积分数；根据所述页岩油储层的干酪根体积分数及总有机碳体积分数,得到所述页岩油储层的含油质量分数。本发明提出的技术方案的有益效果是：通过页岩油储层的干酪根体积分数及总有机碳体积分数,得到页岩油储层的含油质量分数,由于干酪根体积分数及总有机碳体积分数均可通过测井资料获取,因此,通过本方法可利用测井资料计算页岩油储层含油量,同时,本方法计算过程简单且合乎物理推导论证过程,可靠性良好,有利于促进页岩油储层勘探开发。(The invention discloses a method for calculating the oil content of a shale oil reservoir by using logging information, which comprises the following steps: obtaining the kerogen volume fraction of a shale oil reservoir; obtaining the volume fraction of total organic carbon of a shale oil reservoir; and obtaining the oil-containing mass fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir. The technical scheme provided by the invention has the beneficial effects that: the oil-containing mass fraction of the shale oil reservoir is obtained through the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and the kerogen volume fraction and the total organic carbon volume fraction can be obtained through logging data, so that the oil content of the shale oil reservoir can be calculated through the logging data.)

1. A method for calculating the oil content of a shale oil reservoir by utilizing logging information is characterized by comprising the following steps:

obtaining the kerogen volume fraction of a shale oil reservoir;

obtaining the volume fraction of total organic carbon of a shale oil reservoir;

and obtaining the oil-containing mass fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir.

2. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 1, wherein the step of obtaining the kerogen volume fraction of the shale oil reservoir specifically comprises the following steps:

acquiring a nuclear magnetic resonance logging porosity value of a shale reservoir;

obtaining a density log value of the shale reservoir;

obtaining a rock mineral skeleton density value, a fluid density value and a kerogen density value in a shale reservoir;

and obtaining the kerogen volume fraction of the shale oil reservoir according to the nuclear magnetic resonance logging porosity value, the density logging value, the rock mineral skeleton density value, the fluid density value and the kerogen density value of the shale oil reservoir.

3. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 2, wherein the kerogen volume fraction of the shale oil reservoir is obtained according to the nuclear magnetic resonance logging porosity value, the density logging value, the rock mineral skeleton density value, the fluid density value and the kerogen density value of the shale oil reservoir, and specifically comprises the following steps:

wherein the content of the first and second substances,is the kerogen volume fraction of the shale reservoir and DEN is the density log value of the shale reservoir, phi_NMRLogging porosity values, rho, for nuclear magnetic resonance_maIs the density value of rock mineral skeleton in shale reservoir, rho_fAs the fluid density value, p, in the shale reservoir_keroIs the kerogen density value, k, in shale reservoirs₁Is the first calibration coefficient.

4. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 1, wherein the step of obtaining the kerogen volume fraction of the shale oil reservoir specifically comprises the following steps:

acquiring a nuclear magnetic resonance logging porosity value of a shale reservoir;

obtaining a neutron logging porosity value of a shale reservoir;

and obtaining the kerogen volume fraction of the shale oil reservoir according to the nuclear magnetic resonance logging porosity value and the neutron logging porosity value of the shale oil reservoir.

5. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 4, wherein the kerogen volume fraction of the shale oil reservoir is obtained according to the nuclear magnetic resonance logging porosity value and the neutron logging porosity value of the shale reservoir, and specifically comprises the following steps:

wherein the content of the first and second substances,is the kerogen volume fraction, phi, of the shale reservoir_NFor density logging of porosity values, phi_NMRLogging porosity value, k, for nuclear magnetic resonance₂Is the second calibration coefficient.

6. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 1, wherein the step of obtaining the total organic carbon volume fraction of the shale oil reservoir specifically comprises the steps of:

acquiring the total organic carbon mass fraction of a shale oil reservoir;

obtaining the average density of organic matters of a shale oil reservoir;

and obtaining the total organic carbon volume fraction of the shale oil reservoir according to the total organic carbon mass fraction of the shale oil reservoir and the average density of the organic matters.

7. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 1, wherein the step of obtaining the oil content mass fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir specifically comprises the following steps:

acquiring the oil-containing volume fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir;

obtaining the density of the petroleum in the shale oil reservoir;

and obtaining the oil-containing mass fraction of the shale oil reservoir according to the oil-containing volume fraction of the shale oil reservoir and the density of the oil in the shale oil reservoir.

8. The method for calculating the oil content of the shale oil reservoir by using the logging data as claimed in claim 7, wherein the oil content volume fraction of the shale oil reservoir is obtained according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and specifically comprises the following steps:

V_o＝V_TOC-V_kero

wherein, V_oOil volume fraction, V, for shale oil reservoirs_TOCKerogen volume fraction, V, for shale oil reservoirs_keroIs the kerogen volume fraction of a shale oil reservoir.

9. An electronic device comprising a processor and a memory, said memory having stored thereon a computer program which, when executed by said processor, carries out the method of calculating the oil content of a shale oil reservoir from well log data as claimed in any one of claims 1 to 8.

10. A computer-readable storage medium, having stored thereon a computer program, wherein the computer program is loaded by a processor to perform the steps of the method for calculating the oil content of a shale oil reservoir from well log data as claimed in any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of shale oil exploration and development, in particular to a method for calculating the oil content of a shale oil reservoir by using logging information.

Background

The oil content of the shale oil reservoir is a key factor for determining the exploration and development economy, the productivity prediction result and the actual change rule of the shale oil reservoir. At present, two methods for determining the oil content of shale oil are mainly used, wherein the oil content of the shale oil is determined based on a rock experiment mode, but the method cannot obtain a continuous profile of the oil content; and secondly, the oil saturation is calculated based on the Archie formula, and then the oil content is converted, however, the oil content evaluation based on the Archie formula or the improved Archie is not suitable for shale oil reservoirs with complex pore structures and mineral components.

The shale oil content prediction method which is proposed by Wangmen and the like in 2015 and evaluated by LogR-Delta T logging (please refer to the Chinese invention patent with the application number of CN 201310178925.0), in the technical scheme, resistivity logging and acoustic wave time difference logging data are preprocessed, and then least square fitting of statistical relationship is carried out by using core S1 data and processing values of the two curves.

In conclusion, an oil-bearing logging evaluation technical means which is suitable for a shale oil reservoir and has simple and effective calculation process and is in accordance with a physical derivation demonstration process is lacked in the prior art, and the adverse effect is caused on the exploration and development of the shale oil reservoir.

Disclosure of Invention

In view of the above, there is a need to provide a method for calculating the oil content of a shale oil reservoir by using well-logging data, which is suitable for a physical deduction and demonstration process and is simple and effective in a calculation process.

In order to achieve the above object, the present invention provides a method for calculating oil content of a shale oil reservoir by using logging data, which is characterized by comprising:

obtaining the kerogen volume fraction of a shale oil reservoir;

obtaining the volume fraction of total organic carbon of a shale oil reservoir;

and obtaining the oil-containing mass fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir.

Preferably, obtaining the kerogen volume fraction of the shale oil reservoir specifically comprises: acquiring a nuclear magnetic resonance logging porosity value of a shale reservoir; obtaining a density log value of the shale reservoir; obtaining a rock mineral skeleton density value, a fluid density value and a kerogen density value in a shale reservoir; and obtaining the kerogen volume fraction of the shale oil reservoir according to the nuclear magnetic resonance logging porosity value, the density logging value, the rock mineral skeleton density value, the fluid density value and the kerogen density value of the shale oil reservoir.

Preferably, the kerogen volume fraction of the shale oil reservoir is obtained according to the nuclear magnetic resonance logging porosity value, the density logging value, the rock mineral skeleton density value, the fluid density value and the kerogen density value of the shale oil reservoir, and specifically comprises the following steps:

wherein the content of the first and second substances,is the kerogen volume fraction of the shale reservoir and DEN is the density log value of the shale reservoir, phi_NMRLogging porosity values, rho, for nuclear magnetic resonance_maIs the density value of rock mineral skeleton in shale reservoir, rho_fAs the fluid density value, p, in the shale reservoir_keroIs the kerogen density value, k, in shale reservoirs₁Is the first calibration coefficient.

Preferably, obtaining the kerogen volume fraction of the shale oil reservoir specifically comprises: acquiring a nuclear magnetic resonance logging porosity value of a shale reservoir; obtaining a neutron logging porosity value of a shale reservoir; and obtaining the kerogen volume fraction of the shale oil reservoir according to the nuclear magnetic resonance logging porosity value and the neutron logging porosity value of the shale oil reservoir.

Preferably, the kerogen volume fraction of the shale oil reservoir is obtained according to the nuclear magnetic resonance logging porosity value and the neutron logging porosity value of the shale reservoir, and specifically comprises the following steps:wherein the content of the first and second substances,is the kerogen volume fraction, phi, of the shale reservoir_NFor density logging of porosity values, phi_NmRLogging porosity value, k, for nuclear magnetic resonance₂Is the second calibration coefficient.

Preferably, obtaining the total organic carbon volume fraction of the shale oil reservoir specifically comprises: acquiring the total organic carbon mass fraction of a shale oil reservoir; obtaining the average density of organic matters of a shale oil reservoir; and obtaining the total organic carbon volume fraction of the shale oil reservoir according to the total organic carbon mass fraction of the shale oil reservoir and the average density of the organic matters.

Preferably, the oil-containing mass fraction of the shale oil reservoir is obtained according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and specifically comprises the following steps: acquiring the oil-containing volume fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir; obtaining the density of the petroleum in the shale oil reservoir; and obtaining the oil-containing mass fraction of the shale oil reservoir according to the oil-containing volume fraction of the shale oil reservoir and the density of the oil in the shale oil reservoir.

Preferably, the oil-containing volume fraction of the shale oil reservoir is obtained according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and specifically comprises the following steps: v_o＝V_TOC-V_kero

Wherein, V_oOil volume fraction, V, for shale oil reservoirs_TOCKerogen volume fraction, V, for shale oil reservoirs_keroIs the kerogen volume fraction of a shale oil reservoir.

The invention also provides electronic equipment which comprises a processor and a memory, wherein the memory is stored with a computer program, and the computer program is executed by the processor to realize the method for calculating the oil content of the shale oil reservoir by using the logging data.

The present invention also provides a computer readable storage medium having stored thereon a computer program, which is loaded by a processor, for performing the steps of the method for calculating the oil content of a shale oil reservoir using logging data as provided by the present invention.

Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: the oil-containing mass fraction of the shale oil reservoir is obtained through the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and the kerogen volume fraction and the total organic carbon volume fraction can be obtained through logging data, so that the oil content of the shale oil reservoir can be calculated through the logging data.

Drawings

FIG. 1 is a flow chart of an embodiment of a method for calculating oil content of a shale oil reservoir using well log data provided by the present invention;

FIG. 2 is a schematic flow chart of a first embodiment of step S100 in FIG. 1;

FIG. 3 is a volumetric model of a shale oil reservoir;

FIG. 4 is a schematic flow chart of a second embodiment of step S100 in FIG. 1;

FIG. 5 is a schematic flow chart of step S200 in FIG. 1;

FIG. 6 is a schematic flow chart of step S300 in FIG. 1;

FIG. 7 is a graph comparing the oil content of a shale oil reservoir calculated from well log data using the method provided by the present invention with the oil content of a shale oil reservoir obtained from core measurements;

fig. 8 is a schematic structural diagram of an electronic device diagram provided by the present invention.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the method for calculating oil content of a shale oil reservoir by using logging data according to the present invention, where the method for calculating oil content of a shale oil reservoir by using logging data includes:

s100, obtaining the kerogen volume fraction of the shale oil reservoir, wherein in the embodiment, the kerogen volume fraction of the shale oil reservoir is obtained through logging data;

s200, acquiring the Total Organic Carbon (TOC) volume fraction of the shale oil reservoir, wherein the total organic carbon mass fraction of the shale oil reservoir can be acquired through logging information, which is the prior art and is not repeated, and then converting the organic carbon mass fraction to obtain the organic carbon volume fraction;

s300, obtaining the oil-containing mass fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, wherein the total organic carbon is composed of kerogen and oil in reservoir pores, so that the oil-containing volume fraction of the shale oil reservoir can be obtained after the volume fraction of the total organic carbon and the volume fraction of the kerogen are obtained, and then the oil-containing mass fraction of the shale oil reservoir is obtained through conversion of the oil-containing volume fraction of the shale oil reservoir.

According to the method, the oil-containing mass fraction of the shale oil reservoir is obtained through the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and the kerogen volume fraction and the total organic carbon volume fraction can be obtained through logging information, so that the oil content of the shale oil reservoir can be calculated through the logging information.

In the invention, two methods are used for obtaining the kerogen volume fraction of the shale oil reservoir in the step S100, one method is obtained by combining nuclear magnetic resonance logging and density logging, the other method is obtained by combining nuclear magnetic resonance logging and neutron logging, the two methods have similar principles, when in specific application, one method can be selected to calculate the kerogen volume fraction of the shale oil reservoir, the kerogen volume fraction of the shale oil reservoir can also be calculated by the two methods respectively, and then the two methods are averaged, and the two methods are introduced below respectively.

Obtaining kerogen volume fraction by combining nuclear magnetic resonance logging and density logging

Referring to fig. 2, in a preferred embodiment, the step S100 specifically includes:

s101, obtaining a nuclear magnetic resonance logging porosity value of a shale reservoir;

s102, obtaining a density log value of the shale reservoir;

s103, obtaining a rock mineral skeleton density value, a fluid density value and a kerogen density value in the shale reservoir;

s104, obtaining the kerogen volume fraction of the shale oil reservoir according to the nuclear magnetic resonance logging porosity value, the density logging value, the rock mineral skeleton density value, the fluid density value and the kerogen density value of the shale oil reservoir, and specifically comprises the following steps:

wherein the content of the first and second substances,is the kerogen volume fraction of the shale reservoir and DEN is the density log value of the shale reservoir, phi_NMRLogging porosity values, rho, for nuclear magnetic resonance_maIs the density value of rock mineral skeleton in shale reservoir, rho_fAs the fluid density value, p, in the shale reservoir_keroIs shaleKerogen density value, k, in reservoir₁Is the first calibration coefficient.

The derivation of equation (1) is as follows:

referring to FIG. 3, FIG. 3 is a volume model of a shale oil reservoir (where φ_DENFor density logging of porosity, phi_NFor neutron logging of porosity, phi_NMRPorosity for nmr logging), the composition of the formation volume model can be divided into three parts, pore (Pores), solid Kerogen (Kerogen) and rock Mineral skeleton (Mineral Matrix), based on the analysis of the shale oil reservoir formation, so that:

V_kero+V_ma+V_pore＝1 (2)

wherein V_keroIs the volume fraction of kerogen, V_maIs the volume fraction of the rock mineral skeleton, V_poreFor porosity, fluid is present in the pores and can therefore be identified by nmr logging methods, while kerogen contributes little to nmr logging response and is negligible. Meanwhile, because the density and the hydrogen index of kerogen are close to those of the fluid, the density logging response and the neutron logging response of the kerogen are close to those of the pore fluid. Thus, the response equation for its density log can be written as:

DEN＝V_kero·ρ_kero+V_ma·ρ_ma+V_pore·ρ_f (3)

where DEN is the density log, ρ_maIs the density value of rock mineral skeleton in shale reservoir, rho_fAs the fluid density value, p, in the shale reservoir_keroIs the kerogen density value, V, in shale reservoirs_keroIs the kerogen volume fraction, V_maIs the volume fraction of the rock mineral skeleton, V_poreIs porosity.

Simultaneously, the porosity phi obtained by NMR logging_NMRAnd v in formula (3)_poreEqual, i.e.:

φ_NMR＝V_pore (4)

substituting the formula (2) and the formula (4) into the formula (3) can obtain:

because certain errors may exist in links such as parameter setting and the like, a first calibration coefficient k is introduced₁By modifying the formula (5), the formula (1) can be obtained, and it should be noted that: in formula (1)And V in the formula (5)_keroHave the same physical meaning.

The specific calibration method comprises the following steps: v is obtained by well logging measurements using equation (5)_keroThe value of (c) is obtained by core measurement for the same reservoir (same well, same depth)So as to calculate the first calibration coefficient k₁The value of (c).

(II) obtaining kerogen volume fraction by combining nuclear magnetic resonance logging and neutron logging

Referring to fig. 4, in a preferred embodiment, the step S100 specifically includes:

s111, obtaining a nuclear magnetic resonance logging porosity value of the shale reservoir;

s112, obtaining a neutron logging porosity value of the shale reservoir;

s113, obtaining the kerogen volume fraction of the shale oil reservoir according to the nuclear magnetic resonance logging porosity value and the neutron logging porosity value of the shale reservoir, and specifically:

wherein the content of the first and second substances,is the kerogen volume fraction, phi, of the shale reservoir_NFor density logging of porosity values, phi_NMRIs nuclear magnetismResonance logging porosity value, k₂Is the second calibration coefficient.

The derivation of equation (6) is as follows:

the fluid in the pores can be identified by the NMR logging method, and the kerogen has small and negligible contribution to the response of the NMR logging. Meanwhile, because the density and the hydrogen index of kerogen are close to those of fluid, and the sub-logging response is close to that of pore fluid, the porosity obtained by the neutron logging method is actually equal to the sum of the volume fraction of kerogen and the real porosity, and the porosity obtained by nuclear magnetic resonance logging is the real porosity, so that the difference between the porosity calculated by the nuclear magnetic resonance logging and the porosity calculated by the density logging is equal to the volume fraction of kerogen, and similarly, a second calibration coefficient k is introduced for reducing errors₂To correct the formula to obtain the formula (6), the second calibration coefficient k₂Determination method and first calibration factor k₁Similarly, no further description is provided herein.

In the present invention, referring to fig. 5, the method for obtaining the total organic carbon volume fraction of the shale oil reservoir in step S200 specifically includes the following steps:

s201, acquiring the total organic carbon mass fraction of a shale oil reservoir, wherein various effective methods for calculating the total organic carbon mass fraction by using logging information exist at present, such as a delta logR method and a double-mud-mass-content method (dual-V)_shmethod), etc., therefore no further description is given in the present invention, and the method of calculating the total organic carbon mass fraction can be selected according to the data situation and the requirement;

s202, obtaining the average density of organic matters of the shale oil reservoir;

s203, obtaining the total organic carbon volume fraction of the shale oil reservoir according to the total organic carbon mass fraction of the shale oil reservoir and the average density of organic matters, and specifically:

wherein, V_TOCIs a pageThe total organic carbon volume fraction of the rock oil reservoir, the TOC is the total organic carbon mass fraction of the shale oil reservoir, the DEN is the density log value of the shale oil reservoir, rho_TOCIs the average density of organic matter of the shale oil reservoir, where p_TOCThe selection of the value can be made based on experimental data or empirically.

Referring to fig. 6, in step S300, the oil-containing mass fraction of the shale oil reservoir is obtained according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and the method specifically includes the following steps:

s301, obtaining the oil-containing volume fraction of the shale oil reservoir according to the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and specifically:

V_o＝V_TOC-V_kero (8)

wherein, V_oOil volume fraction, V, for shale oil reservoirs_TOCKerogen volume fraction, V, for shale oil reservoirs_keroIs the kerogen volume fraction of a shale oil reservoir.

S302, obtaining the density of petroleum in the shale oil reservoir;

s303, obtaining the oil-containing mass fraction of the shale oil reservoir according to the oil-containing volume fraction of the shale oil reservoir and the density of oil in the shale oil reservoir, and specifically:

wherein C is_oIs the oil mass fraction of the shale oil reservoir; rho_oThe choice of this value, V, can be made for the density of the oil, either on the basis of experimental data or empirically_oOil volume fraction, rho, for shale oil reservoirs_oIs the density of the oil in the shale oil reservoir and DEN is the density log of the shale oil reservoir.

Referring to fig. 8, the present invention further provides an electronic device, which may be a computing device such as a mobile terminal, a desktop computer, a notebook, a palm computer, and a server. The electronic device comprises a processor 10, a memory 20 and a display 30. Fig. 8 shows only some of the components of the electronic device, but it is to be understood that not all of the shown components are required to be implemented, and that more or fewer components may be implemented instead.

The memory 20 may in some embodiments be an internal storage unit of the electronic device, such as a hard disk or a memory of the electronic device. The memory 20 may also be an external storage device of the electronic device in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the electronic device. Further, the memory 20 may also include both an internal storage unit and an external storage device of the electronic device. The memory 20 is used for storing application software installed in the electronic device and various types of data, such as program codes of the installed electronic device. The memory 20 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 20 stores a program 40 of a method for calculating oil content of a shale oil reservoir by using logging data, and the program 40 of the method for calculating oil content of a shale oil reservoir by using logging data can be executed by the processor 10, so as to realize the method for calculating oil content of a shale oil reservoir by using logging data of the embodiments of the present application.

The processor 10 may be, in some embodiments, a Central Processing Unit (CPU), a microprocessor or other data Processing chip, and is configured to execute program codes stored in the memory 20 or process data, such as executing the method for calculating the oil content of the shale oil reservoir using the logging data.

The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 30 is used for displaying information at the electronic device and for displaying a visual user interface. The components 10-30 of the electronic device communicate with each other via a system bus.

In an embodiment, when the processor 10 executes the program 40 of the method for calculating the oil content of the shale oil reservoir by using the logging data in the memory 20, the steps in the method for calculating the oil content of the shale oil reservoir by using the logging data according to the above embodiment are implemented, and since the method for calculating the oil content of the shale oil reservoir by using the logging data is described in detail above, the detailed description is omitted here.

The present invention also provides a computer readable storage medium having stored thereon a computer program, which is loaded by a processor, for performing the steps of the method for calculating the oil content of a shale oil reservoir using logging data as provided by the present invention.

In order to verify the accuracy and reliability of the technical scheme provided by the invention, a sheet of rock oil block is selected for research, as shown in fig. 7, the TOC and kerogen content of each depth point is calculated in sequence by using the method provided by the invention, and finally the oil content value of the continuous well section can be obtained. In fig. 7, the right 2 nd lane is the calculated content of kerogen, the last lane is the comparison of the oil content calculation result and the core result, the curve is the calculated value, the rod is the core value, and the calculation result shows that the oil-containing mass fraction data point calculated by the technical scheme provided by the invention is well matched with the oil-containing mass fraction data point obtained by the core data, which proves that the technical scheme provided by the invention has high accuracy and reliability and can meet the requirements of actual exploration and development.

The technical scheme provided by the invention has the beneficial effects that:

(1) the oil-containing mass fraction of the shale oil reservoir is obtained through the kerogen volume fraction and the total organic carbon volume fraction of the shale oil reservoir, and the kerogen volume fraction and the total organic carbon volume fraction can be obtained through logging data, so that the oil content of the shale oil reservoir can be calculated through the logging data, and meanwhile, the calculation process of the method is simple and conforms to the physical derivation and demonstration process, the reliability is good, and the exploration and development of the shale oil reservoir are facilitated;

(2) the kerogen volume fraction is obtained through the combination of nuclear magnetic resonance logging and density logging, and the nuclear magnetic resonance logging does not respond to the kerogen, so that the porosity obtained through nuclear magnetic resonance measurement is the real porosity of a shale oil reservoir, meanwhile, the density logging responds to the kerogen, and the real porosity obtained through the nuclear magnetic resonance measurement is substituted into a density logging calculation formula, so that the first method for calculating the kerogen volume fraction can be obtained;

(3) obtaining the volume fraction of kerogen through the combination of nuclear magnetic resonance logging and neutron logging, wherein the porosity obtained through nuclear magnetic resonance measurement is the real porosity of a shale oil reservoir, and the porosity obtained through a neutron logging method is equal to the sum of the volume fraction of kerogen and the real porosity, so that the difference value of the porosity calculated through nuclear magnetic resonance logging and the porosity calculated through density logging is equal to the volume fraction of kerogen, and the second method for calculating the volume fraction of kerogen in the invention can be obtained;

(4) in the invention, the kerogen volume fraction obtained by the core test is used for calibrating the kerogen volume fraction obtained by the logging method, so that the accuracy of the calculation result of the kerogen volume fraction can be improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.