Method for determining hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of hydrocarbon source rock

Abstract

The invention discloses a method for determining hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of hydrocarbon source rock. The method comprises the following steps: carrying out experiments on a plurality of homologous samples, and measuring respective experiment hydrocarbon expulsion amounts and residual hydrocarbon amounts of the plurality of homologous samples and respective reflectivity of the plurality of homologous samples; according to the respective reflectivity of the plurality of homologous samples and a predetermined hydrocarbon production rate relation function, determining the hydrocarbon production rates of the plurality of homologous samples at respective maturity; and determining the total hydrocarbon generation amount and the total hydrocarbon expulsion amount of the plurality of homologous samples at the respective maturity and the original organic carbon content of the target hydrocarbon source rock according to the hydrocarbon production rates of the plurality of homologous samples at the respective maturity and the respective experimental hydrocarbon expulsion amount and the residual hydrocarbon amount of the plurality of homologous samples at the respective maturity. According to the method, the technical problem that the determined total hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of the hydrocarbon source rock are inaccurate when the hydrocarbon source rock with relatively high maturity is used for a hot-pressing experiment is solved.

Description

Technical Field

[0001] The invention relates to the field of oil and gas exploration, and in particular to a method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock. Background Art

[0002] Source rock evaluation is one of the important contents of oil and gas resource evaluation. According to the modern oil and gas genesis mechanism, the amount of oil and gas generated per unit mass of source rock depends on the abundance, type (reflecting the hydrocarbon generation capacity of unit mass of organic matter) and maturity of organic matter. When calculating the amount of resources in resource potential evaluation, the original organic carbon and hydrocarbon production rate parameters are obtained to obtain the oil and gas generation of the evaluation target.

[0003] The organic carbon content in rocks is the most important organic geochemical indicator for the evaluation of oil and gas resources and source rocks in sedimentary basins. The organic matter content of source rocks before the oil generation threshold before large-scale hydrocarbon generation and expulsion is called the original organic matter abundance, and what is usually measured is the residual organic matter content after hydrocarbon generation and expulsion of source rocks. Among the existing methods for obtaining the original organic carbon and hydrocarbon production rate parameters, the thermal simulation experiment method can not only obtain the oil and gas generated by the source rock, but also provide the discharged and retained oil and gas at different evolutionary stages. The results are intuitive, concise, and the mechanism is clear. It eliminates human factors and has been widely used in my country. The method is to select representative source rock samples of different types of immature and low maturity, place them in a thermal simulation experimental device, and heat them to different temperatures to obtain the oil (gas) conversion rate-experimental temperature relationship diagram. By measuring the vitrinite reflectance and asphalt extract content of the samples after the experiment, an oil (gas) conversion rate-maturity relationship diagram can be established. In this way, for actual geological samples, after knowing the maturity of oil and gas, the yield or conversion rate of oil and gas can be found from the figure. As for the original organic carbon value (original organic carbon content), since the samples used in the experiment are immature to low-mature, it can be basically considered that there is no hydrocarbon expulsion or the amount of hydrocarbon expulsion is very small and can be ignored. Therefore, the organic carbon of the test sample is the original organic carbon of the sample. Then, the organic carbon and hydrocarbon production rate value are used to quantitatively calculate the amount of oil (gas) generated by the relevant source rock. However, this method is subject to certain limitations in practical applications. In some strata, the maturity of source rocks is generally high, and representative samples of immature or low-mature source rocks cannot be obtained. Researchers can only use source rocks with higher maturity to conduct hot pressure simulation of hydrocarbon generation and expulsion experiments. It is generally believed that immature or low-mature source rocks have no hydrocarbon expulsion or even if it occurs, it is a very small amount that can be ignored. However, the amount of hydrocarbon expulsion that has occurred in higher maturity source rocks is relatively large. The thermal pressure simulation experiment using higher maturity source rock samples cannot obtain the amount of hydrocarbon expulsion from immature to higher maturity from the experiment, and can only obtain the lower hydrocarbon production rate of the current maturity source rock. If the source rock type is better, the obtained hydrocarbon production rate is seriously too low. Petroleum geologists can only roughly estimate or directly ignore this part of the hydrocarbon volume, and the current organic carbon value is significantly lower than the original organic carbon value, resulting in the resource volume calculated using the organic carbon value and the hydrocarbon production rate data obtained in this experiment is seriously inaccurate or too low.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] An embodiment of the present invention provides a method for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock, so as to at least solve the technical problem of inaccurate total hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock when a high-maturity source rock is used for hot pressure experiments.

[0006] According to one aspect of an embodiment of the present invention, a method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock is provided, comprising: conducting experiments on a plurality of homologous samples, measuring the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the plurality of homologous samples, and the reflectivity of each of the plurality of homologous samples, wherein the plurality of homologous samples are all derived from target source rocks in a target area, the reflectivity of each of the plurality of homologous samples is the reflectivity of the plurality of homologous samples after a respective temperature simulation experiment, and the reflectivity of each of the plurality of homologous samples represents the respective maturity of the plurality of homologous samples after the respective temperature simulation experiment; and determining the relative maturity of the plurality of homologous samples according to the respective reflectivity of the plurality of homologous samples and a predetermined relative maturity. A hydrocarbon production rate relationship function is used to determine the hydrocarbon production rates of multiple homologous samples at their respective maturities, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function characterizes the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; based on the hydrocarbon production rates of the multiple homologous samples at their respective maturities, the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples, the total hydrocarbon generation amount and the total hydrocarbon expulsion amount of the multiple homologous samples at their respective maturities, as well as the original organic carbon content of the target source rock are determined, wherein the total hydrocarbon generation amount characterizes the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion amount characterizes the total mass of hydrocarbon compounds expelled by the sample.

[0007] Optionally, the total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturity, and the organic carbon content of the target source rock are determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined first formula, the amount of hydrocarbons expelled by the samples of the target mass before the experiment is determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples; the experimental hydrocarbon generation of the multiple homologous samples during the experiment is determined according to the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples respectively; the total hydrocarbon generation of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled by the samples of the target mass before the experiment and the experimental hydrocarbon generation amounts of the multiple homologous samples; the total hydrocarbon expulsion of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled by the samples of the target mass before the experiment and the experimental hydrocarbon expulsion amounts of the multiple homologous samples.

[0008] Optionally, the sum of the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples is the experimental hydrocarbon generation amount of the multiple homologous samples.

[0009] Optionally, the experimental hydrocarbon generation amounts of the multiple homologous samples are summed with the hydrocarbon amounts discharged by the sample of target mass before the experiment to obtain the total hydrocarbon generation amounts of the multiple homologous samples at their respective maturity levels.

[0010] Optionally, the organic carbon content of the target source rock is determined based on the hydrocarbon production rates of multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined second formula, the organic carbon content of the target source rock is determined based on the target mass, the hydrocarbon production rates of the multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples.

[0011] Optionally, the method also includes: obtaining the source rock area, average source rock thickness, and average source rock density of the target area; determining the average hydrocarbon production rate and average organic carbon content of the source rocks included in the target area; and determining the oil and gas generation in the target area based on the source rock area, average source rock thickness, average source rock density, average organic carbon content, and average hydrocarbon production rate.

[0012] Optionally, the hydrocarbon production rate relationship function is determined in the following manner: obtaining a plurality of similar samples of the same source, wherein the plurality of similar samples of the same source are all derived from similar source rocks obtained in an adjacent area, wherein the difference between the organic geochemical characteristics of the similar source rocks and the organic geochemical characteristics of the target source rocks is less than a predetermined threshold, and the distance between the adjacent area and the target area is within a predetermined range; conducting experiments on the plurality of similar samples of the same source, measuring the reflectivity of each of the plurality of similar samples of the same source, and the respective hydrocarbon production rates; determining, based on the respective reflectivity of the plurality of similar samples of the same source, and the respective hydrocarbon production rates, the relationship function between the hydrocarbon production rate and maturity of the similar source rocks as the hydrocarbon production rate relationship function.

[0013] According to another aspect of an embodiment of the present invention, a device for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock is provided, comprising: an experimental module for conducting experiments on a plurality of homologous samples, measuring the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the plurality of homologous samples, and the reflectivity of each of the plurality of homologous samples, wherein the plurality of homologous samples are all derived from target source rocks in a target area, the reflectivity of each of the plurality of homologous samples is the reflectivity of the plurality of homologous samples after a respective temperature simulation experiment, and the reflectivity of each of the plurality of homologous samples represents the respective maturity of the plurality of homologous samples after the respective temperature simulation experiment; a first determination module for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock according to the respective reflectivity of the plurality of homologous samples and the predicted A hydrocarbon production rate relationship function is first determined to determine the hydrocarbon production rates of multiple homologous samples at their respective maturities, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function characterizes the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; a second determination module is used to determine the total hydrocarbon generation and total hydrocarbon expulsion of multiple homologous samples at their respective maturities, as well as the original organic carbon content of the target source rock based on the hydrocarbon production rates of the multiple homologous samples at their respective maturities, the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples, wherein the total hydrocarbon generation amount characterizes the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion amount characterizes the total mass of hydrocarbon compounds expelled by the sample.

[0014] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above-mentioned methods for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of the source rock.

[0015] According to another aspect of an embodiment of the present invention, a computer device is provided, comprising a processor for running a program, wherein when the program is run, any one of the above methods for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock is executed.

[0016] In an embodiment of the present invention, by conducting experiments on multiple homologous samples, the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the multiple homologous samples, as well as the reflectivity of each of the multiple homologous samples are measured, wherein the multiple homologous samples all originate from the target source rock in the target area, the reflectivity of each of the multiple homologous samples is the reflectivity of the multiple homologous samples after the respective temperature simulation experiments, and the reflectivity of each of the multiple homologous samples represents the respective maturity of the multiple homologous samples after the respective temperature simulation experiments; according to the respective reflectivity of the multiple homologous samples and a predetermined hydrocarbon production rate relationship function, the hydrocarbon production rates of the multiple homologous samples at their respective maturity are determined, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function represents the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; according to the multiple The hydrocarbon production rates of multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of multiple homologous samples, the total hydrocarbon generation and total hydrocarbon expulsion amounts of multiple homologous samples at their respective maturity, and the organic carbon content of the target source rock are determined, wherein the total hydrocarbon generation amount characterizes the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion amount characterizes the total mass of hydrocarbon compounds expelled by the sample, and the dynamic action relationship between the hydrocarbon generation amount and the hydrocarbon production rate is adopted to achieve the purpose of determining the total hydrocarbon generation amount of the sample according to the experimental hydrocarbon production rate, thereby achieving the technical effect of determining the total mass of hydrocarbon compounds generated by the sample at the current maturity, thereby solving the technical problem of inaccurate total hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock determined when the source rock with higher maturity is used for hot pressure experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A hardware structure block diagram of a computer terminal for implementing a method for determining hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock is shown;

[0019] Figure 2 It is a flow chart of a method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock provided in an embodiment of the present invention;

[0020] Figure 3 is a graph showing the relationship between hydrocarbon production rate and reflectivity provided according to an optional embodiment of the present invention;

[0021] Figure 4 It is a structural block diagram of an apparatus for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock provided according to an optional embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] According to an embodiment of the present invention, a method embodiment for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0025] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 The hardware structure block diagram of a computer terminal for implementing a method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock is shown. Figure 1 As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0026] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0027] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the method for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of source rocks in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the method for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of source rocks of the above-mentioned application program is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0028] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0029] Figure 2 : is a flow chart of a method for determining hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0030] Step S202, conducting experiments on multiple homologous samples, measuring the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the multiple homologous samples, and the reflectivity of each of the multiple homologous samples, wherein the multiple homologous samples all originate from the target source rocks in the target area, the reflectivity of each of the multiple homologous samples is the reflectivity of the multiple homologous samples after the respective temperature simulation experiments, and the reflectivity of each of the multiple homologous samples represents the respective maturity of the multiple homologous samples after the respective temperature simulation experiments.

[0031] In this step, the target area is the research area of ​​this oil and gas exploration. According to the method provided by the present invention, the hydrocarbon generation amount of the source rock in the target area can be determined. The experiment conducted on the sample can be a hot pressure simulation experiment to measure the hydrocarbon discharge amount of the sample, that is, the mass of hydrocarbon compounds discharged by the sample collected by the experimenter under the experimental conditions; then the residual sample of the hot pressure simulation experiment can be subjected to a chloroform bitumen "A" extraction test to measure the residual hydrocarbon amount in the residual sample; the residual sample can also be subjected to a kerogen vitrinite reflectance test to determine the reflectance of the sample.

[0032] It should be noted that the source rock in the target area is a source rock with a higher maturity. That is to say, the hydrocarbon generation and expulsion of the source rock detected by the experiment does not take into account the mass of hydrocarbon compounds that have been expelled by the source rock before reaching the current maturity. When sampling in the target area, multiple source rock samples can be collected, and then one of the samples is selected and divided into multiple parts to obtain multiple homologous samples in this step.

[0033] Step S204, determining the hydrocarbon production rates of the plurality of homologous samples at their respective maturities based on their respective reflectances and a predetermined hydrocarbon production rate relationship function, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced per unit mass of the sample, and the hydrocarbon production rate relationship function characterizes the functional relationship between the reflectance and hydrocarbon production rate of the sample.

[0034] In this step, the reflectivity of each sample represents the maturity of the sample. There is a certain relationship between maturity and hydrocarbon production rate. However, since the value obtained through the experiment of samples with higher maturity is inaccurate, a more accurate relationship between maturity and hydrocarbon production rate can be determined in advance based on samples with lower maturity. Then, based on the predetermined relationship between maturity and hydrocarbon production rate, the hydrocarbon production rate of multiple homologous samples can be accurately determined based on their respective reflectivity.

[0035] Step S206, determining the total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturity, and the original organic carbon content of the target source rock based on the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion and residual hydrocarbon amounts of the multiple homologous samples, wherein the total hydrocarbon generation represents the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion represents the total mass of hydrocarbon compounds expelled by the sample.

[0036] When the maturity of the source rock is low, a thermal pressure simulation experiment can be conducted, and it can be basically assumed that it has not undergone hydrocarbon expulsion or the amount of hydrocarbon expulsion is very small and can be ignored. The hydrocarbon generation amount obtained in the experiment can be used as the total hydrocarbon generation amount of the source rock. However, the amount of hydrocarbon expulsion that has occurred in the source rock with a higher maturity is larger. When the thermal pressure simulation experiment is conducted on the source rock samples with a higher maturity, the amount of hydrocarbon expulsion that occurs from immaturity to higher maturity cannot be obtained from the experiment.

[0037] In this step, the dynamic relationship between the hydrocarbon production rate and the total hydrocarbon generation can be determined in advance, and then the total hydrocarbon generation, total hydrocarbon expulsion and original organic carbon content of the multiple homologous samples at their respective maturity can be determined based on the hydrocarbon production rates of the multiple homologous samples, as well as the hydrocarbon expulsion and residual hydrocarbons obtained in the experiment. Among them, the original organic carbon content is the total organic carbon content included in the source rock, rather than the organic carbon content measured after reaching a higher maturity. Similarly, the total hydrocarbon generation is the total mass of hydrocarbon compounds generated by the source rock, and the total hydrocarbon expulsion is the total mass of hydrocarbon compounds expelled by the source rock, rather than the hydrocarbon generation and hydrocarbon expulsion measured after reaching a higher maturity.

[0038] Through the above steps, the dynamic relationship between hydrocarbon generation amount and hydrocarbon production rate is adopted to achieve the purpose of determining the total hydrocarbon generation amount of the sample according to the experimental hydrocarbon production rate, thereby achieving the technical effect of determining the total mass of hydrocarbon compounds generated by the sample at the current maturity, and further solving the technical problem of inaccurate total hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of the source rock determined when using a higher maturity source rock for hot pressure experiment.

[0039] As an optional embodiment, the hydrocarbon production rate relationship function is determined in the following manner: obtaining a plurality of homologous similar samples, wherein the plurality of homologous similar samples are all derived from similar source rocks obtained in adjacent areas, wherein the difference between the organic geochemical characteristics of the similar source rocks and the organic geochemical characteristics of the target source rocks is less than a predetermined threshold, and the distance between the adjacent area and the target area is within a predetermined range; conducting experiments on the plurality of homologous similar samples, measuring the reflectivity of each of the plurality of homologous similar samples, and the respective hydrocarbon production rates; determining, based on the respective reflectivity of the plurality of homologous similar samples, and the respective hydrocarbon production rates, the relationship function between the hydrocarbon production rate and maturity of the similar source rocks as the hydrocarbon production rate relationship function.

[0040] Optionally, the relationship between maturity and experimental hydrocarbon production rate can be determined in advance by this optional embodiment. Since in actual applications, in some strata, the maturity of source rocks is generally high, it is impossible to obtain immature or low-mature representative source rock samples, and it is possible that immature or low-maturity representative source rock samples cannot be found in the target area, so it is impossible to determine the relationship between suitable maturity and experimental hydrocarbon production rate. At this time, in the adjacent area near the target area, a source rock similar to the source rock in the target area and immature can be found as multiple homologous similar samples, wherein, when sampling in the adjacent area, multiple source rock samples can be collected, and then one of the samples is selected and divided into multiple parts to obtain multiple homologous similar samples in this step. The organic carbon content of multiple homologous similar samples is analyzed to determine their original organic carbon value (original organic carbon content), and a hot pressure simulation experiment is performed, and the residual sample is subjected to a kerogen vitrinite reflectance test and a chloroform asphalt "A" extraction test to determine the reflectivity of multiple homologous similar samples and the hydrocarbon generation amount of multiple homologous similar samples during the experiment. Furthermore, the hydrocarbon generation amount, the original organic carbon value and the mass of multiple homologous similar samples can be substituted according to the following formula (1) to determine the hydrocarbon generation rate of multiple homologous similar samples:

[0041]

[0042] Where G is the hydrocarbon production rate, in mg / g·TOC, m is the mass of the sample, in g, TOC is the original organic carbon value of the source rock, in %, and Q 生 is the hydrocarbon generation amount of a source rock sample with a mass of m at a certain maturity, in mg. It should be noted that the above formula (1) is a general formula. When the sample is a low-maturity source rock, the Q 生 The amount of hydrocarbon generated during the experiment is relatively accurate, and the obtained G is a relatively accurate hydrocarbon production rate; when the sample is a high-maturity source rock, the Q 生 The hydrocarbon generation amount obtained when the sample is tested ignores the hydrocarbon amount that has been excluded before, which is not accurate enough. Therefore, the obtained G is an inaccurate hydrocarbon generation rate. Therefore, the hydrocarbon generation amount of similar samples (low maturity) during the experiment can be substituted into formula (1) to obtain a more accurate hydrocarbon generation rate of similar samples, and then the functional relationship between hydrocarbon generation rate and maturity can be studied. However, the hydrocarbon generation amount of the sample (high maturity) during the experiment in step S202 cannot be substituted into the hydrocarbon generation rate obtained by formula (1) to study the functional relationship between hydrocarbon generation rate and maturity.

[0043] The hydrocarbon generation characteristics of source rocks are essentially determined by the characteristics of kerogen type. The hydrocarbon generation characteristics of similar types of kerogen are basically the same. Therefore, source rocks with similar organic geochemical characteristics (sedimentary environment, parent material type, organic matter abundance, organic matter composition, lithological characteristics, etc.) have basically the same hydrocarbon generation evolution laws. The hydrocarbon generation evolution laws of the source rocks in the study area are basically consistent with those of the source rocks in the adjacent areas. Therefore, the relationship function between the hydrocarbon production rate and reflectivity of immature samples in the adjacent areas is also applicable to the relationship between the hydrocarbon production rate and reflectivity of the source rocks in the study area.

[0044] After determining the hydrocarbon production rates of multiple homologous similar samples according to formula (1), the relationship function G=f(Ro) between the hydrocarbon production rate G and the reflectivity Ro of the source rock can be established according to the reflectivity of the multiple homologous similar samples, that is, the relationship function between the hydrocarbon production rate and maturity of the source rock. Then, the reflectivity of the multiple homologous samples can be brought into the relationship function between the experimental hydrocarbon production rate and maturity to obtain the hydrocarbon production rates of the multiple homologous samples at their respective maturity.

[0045] As an optional embodiment, the total hydrocarbon generation and total hydrocarbon expulsion of multiple homologous samples at their respective maturity, and the organic carbon content of the target source rock are determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined first formula, the amount of hydrocarbons expelled from the samples of the target mass before the experiment is determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples; the experimental hydrocarbon generation of the multiple homologous samples during the experiment is determined according to the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples respectively; the total hydrocarbon generation of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled from the samples of the target mass before the experiment and the experimental hydrocarbon generation amounts of the multiple homologous samples; the total hydrocarbon expulsion of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled from the samples of the target mass before the experiment and the experimental hydrocarbon expulsion amounts of the multiple homologous samples.

[0046] As an optional embodiment, the sum of the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples is the experimental hydrocarbon generation amount of the multiple homologous samples.

[0047] As an optional embodiment, the organic carbon content of the target source rock is determined based on the hydrocarbon production rates of multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined second formula, the organic carbon content of the target source rock is determined based on the target mass, the hydrocarbon production rates of the multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples.

[0048] Optionally, when calculating based on the data of the sample measured in the experiment, the experimental hydrocarbon expulsion amount is the mass of hydrocarbon compounds expelled by the sample during the experiment, the residual hydrocarbon amount of the sample during the experiment is the mass of hydrocarbon compounds contained in the remaining sample after the experiment, and the sum of the experimental hydrocarbon expulsion amount and the residual hydrocarbon amount is the experimental hydrocarbon generation amount of the sample, that is, the amount of hydrocarbon compounds that the sample can produce by itself during the experiment.

[0049] Optionally, the sum of the experimental hydrocarbon expulsion amount and the residual hydrocarbon amount of each of the multiple homologous samples can be used as the experimental hydrocarbon generation amount of each of the multiple homologous samples during the experiment, and then the hydrocarbon production rate of each of the multiple homologous samples at the maturity (hydrocarbon production rate determined according to the reflectivity) and the hydrocarbon generation amount of each of the multiple homologous samples are substituted into the predetermined first formula to obtain the hydrocarbon amount expelled by the target mass sample before the experiment. It should be noted that the number of the multiple homologous samples can be two, that is, two samples of the same mass m can be experimented separately, and the hydrocarbon production rates of the two samples can be calculated according to the reflectivity of each sample, and the hydrocarbon generation amount of the two samples obtained by the experiment can be measured, and the above four physical quantities can be substituted into the first formula, and the result is the hydrocarbon amount that the sample of mass m has expelled before the experiment, that is, the hydrocarbon expulsion amount of the sample from immature to higher maturity.

[0050] As an optional embodiment, the experimental hydrocarbon generation amounts of the multiple homologous samples are summed with the hydrocarbon amounts discharged by the sample of target mass before the experiment to obtain the total hydrocarbon generation amounts of the multiple homologous samples at their respective maturity levels.

[0051] As an optional embodiment, the experimental hydrocarbon expulsion amounts of the multiple homologous samples are summed with the hydrocarbon expulsion amounts of the target mass sample before the experiment to obtain the total hydrocarbon expulsion amounts of the multiple homologous samples at their respective maturity levels.

[0052] Alternatively, the sum of the amount of hydrocarbons discharged by the sample of target mass before the experiment and the amount of hydrocarbons generated during the experiment is the total amount of hydrocarbons that can be generated by the sample of target mass, that is, the total amount of hydrocarbons generated by the sample at a certain maturity. The formula is Q 生总 =Q 排 '+Q 生x , where Q 生x Q is the amount of hydrocarbon generated by the sample at maturity x during the experiment, 排 ' is the amount of hydrocarbons discharged by the sample of target mass before the experiment, Q 生总 The total amount of hydrocarbons that can be generated by the sample of the target quality. The sum of the amount of hydrocarbons discharged by the sample of the target quality before the experiment and the amount of hydrocarbons discharged during the experiment is the total amount of hydrocarbons that can be discharged by the sample of the target quality, that is, the total amount of hydrocarbons discharged by the sample at a certain maturity. It is expressed as Q 排总 =Q 排 '+Q排x , where Q 排x Q is the amount of hydrocarbon generated by the sample at maturity x during the experiment, 排总 The total amount of hydrocarbons that can be produced from a sample of target mass.

[0053] The amount of hydrocarbons previously discharged from the source rocks in the study area can be set as Q 排 ', considering that the sample mass m is Q 排 ', so the original mass of the sample should be The original organic carbon content is TOC 原始 Assume that the multiple homologous samples are two samples, with reflectances Ro1 and Ro2 respectively, and the hydrocarbon generation amounts in the experiment are Q 生1 , Q 生2 , then the total hydrocarbon generation of the source rock samples in the study area at reflectivity Ro1 is Q 排 '+Q 生1 The total hydrocarbon generation when the reflectivity is Ro2 is Q 排 '+Q 生2 .

[0054] Substituting the experimental results of multiple homologous samples of source rocks in this study area into the relationship function between experimental hydrocarbon production rate and reflectivity G = f(Ro), and then combining it with formula (1), we get the following equation group:

[0055]

[0056] Q 生1 , Q 生2 , Ro1, and Ro2 have been obtained from the hot pressure simulation experiment of the source rock in the study area, the chloroform bitumen extraction of residual samples, and the reflectivity measurement experiment. f(Ro) is the relationship function between the hydrocarbon production rate and the reflectivity determined by similar samples before, which is known. Therefore, by solving the above binary equations, the original organic carbon content TOC of the source rock in the study area can be obtained. 原始 and the amount of hydrocarbons discharged before Q 排 ':

[0057]

[0058]

[0059] In general, the sample volume m of the simulation experiment is much larger than the grams of hydrocarbon expulsion. Therefore, the original mass of the sample can be ignored. Approximately replacing the original mass with the experimental sample mass m, the equations become:

[0060]

[0061] Solving this system of equations yields:

[0062]

[0063]

[0064] Formula (5) can be a predetermined first formula. Two samples with the same mass m can be tested separately, and the hydrocarbon generation amounts obtained by the experiments of the two samples are Q 生1 , Q 生2 , and the reflectivity of the two samples is measured to be Ro1 and Ro2 respectively, and the experimental hydrocarbon production rate of the two samples is determined to be f(Ro1) and f(Ro2) according to the relationship function G=f(Ro) between the experimental hydrocarbon production rate G and the reflectivity Ro, and the above physical quantities are substituted into formula (9), and the result is the amount of hydrocarbons Q discharged by the sample with a mass of m before the experiment. 排 ', that is, the amount of hydrocarbon expulsion occurring in samples ranging from immature to more mature.

[0065] Optionally, formula (8) may be the second formula, the multiple homologous samples may be two samples, two samples with the same mass m may be subjected to experiments respectively, and the hydrocarbon generation amounts obtained by the experiments of the two samples are Q 生1 , Q 生2 , and the reflectances of the two samples were measured to be Ro1 and Ro2, and the experimental hydrocarbon production rates of the two samples were determined to be f(Ro1) and f(Ro2) according to the relationship function G=f(Ro) between the experimental hydrocarbon production rate G and the reflectance Ro, and the above physical quantities were substituted into formula (8), and the result was the total organic carbon content TOC of the source rock in the target area. 原始 , that is, the original organic carbon content.

[0066] As an optional embodiment, the method also includes: obtaining the source rock area, average source rock thickness, and average source rock density of the target area; determining the average hydrocarbon production rate and average organic carbon content of the source rocks included in the target area; and determining the oil and gas generation in the target area based on the source rock area, average source rock thickness, average source rock density, average organic carbon content, and average hydrocarbon production rate.

[0067] Alternatively, source rock evaluation is one of the important contents of oil and gas resource evaluation. According to the modern oil and gas genesis mechanism, the amount of oil and gas generated per unit mass of source rock depends on the abundance, type (reflecting the hydrocarbon generation capacity of unit mass of organic matter) and maturity. The evaluation of oil and gas generation is generally calculated using the following formula: Q = S × H × ρ × TOC × HI × X. Among them, Q is the total oil and gas generation in the target area; S is the area of ​​source rock; H is the average thickness of source rock in the area; ρ is the average density of source rock; TOC is the average organic carbon content of source rock, which is the original organic carbon; HI is the original hydrocarbon generation potential per unit mass of organic matter, reflecting the type of organic matter; X is the hydrocarbon conversion rate; HI × X is the average hydrocarbon production rate of source rock, which is the hydrocarbon production per unit mass of organic carbon. According to the above formula and formula (1), when calculating the resource volume in resource potential evaluation, the oil and gas generation volume of the target area can be determined based on the source rock area, average source rock thickness, average source rock density, average source rock organic carbon content and average source rock hydrocarbon production rate. The average total hydrocarbon expulsion volume of the source rocks included in the target area can also be determined, and the total hydrocarbon expulsion volume of the source rocks in the target area can be determined based on the source rock area, average source rock thickness and average source rock density.

[0068] As a specific embodiment, the present invention provides a method for implementing the following specific steps:

[0069] Step 1: Select multiple homologous samples of source rocks with relatively low maturity in the study area for hot pressure simulation experiments. The sample size of each temperature point simulation experiment is the same. Record the sample mass m and the amount of hydrocarbons discharged from the experiment. Perform kerogen vitrinite reflectance and chloroform asphalt "A" extraction tests on the residual samples obtained from the simulation experiments at each temperature point. The reflectance and residual hydrocarbon amount of multiple homologous samples are obtained to determine the amount of hydrocarbon generated during the experiment.

[0070] Step 2: Select multiple similar samples of immature (Ro < 0.5%) source rocks with organic geochemical characteristics similar to those of the source rocks in the study area according to geological conditions in the adjacent areas of the study area for organic carbon content analysis; at the same time, conduct hot pressure simulation experiments on multiple similar samples, record the amount of hydrocarbons discharged from the experiments at each temperature point, and conduct kerogen vitrinite reflectance and chloroform asphalt "A" extraction tests on the residual samples obtained from the simulation experiments at each temperature point.

[0071] Step 3: Based on the results of step 2, the relationship function between the experimental hydrocarbon production rate and maturity is obtained.

[0072] Step 4: Substitute the two experimental results of step 1 into the relationship function obtained in step 3 to obtain f(Ro1) and f(Ro2), and then substitute them into formula (4) or formula (8) to obtain the original organic carbon TOC 原始 Substituting the value into formula (5) yields the previous amount of hydrocarbons discharged Q 排 ' value.

[0073] Step 5: The previously discharged hydrocarbon amount Q 排 ' and the experimental results of step 1 are substituted into Q 生总 =Q 排 '+Q 生x , the total hydrocarbon generation amount Q of the source rock with mass m in the study area at a specified maturity is obtained 生总 . You can also convert the previously discharged hydrocarbon amount Q 排 ' and the experimental results of step 1 are substituted into Q 排总 =Q 排 '+Q 排x , the total hydrocarbon discharge Q of source rock with mass m in the study area at a specified maturity is obtained 排总 .

[0074] Step 6: From the total hydrocarbon generation amount Q 生总 , sample volume m and original organic carbon value TOC 原始 , by substituting it into the oil and gas evaluation generation formula, the oil and gas generation of the source rocks in the study area can be obtained.

[0075] As a specific example, to determine the hydrocarbon generation amount of source rocks in a certain area, when immature samples were not available in the study area, source rock samples with relatively low maturity in the study area were selected for thermal pressure simulation experiments and geochemical analysis. The analysis results are shown in Tables 1 and 2.

[0076] Table 1 Basic information of samples

[0077]

[0078] Table 2 Results of thermal pressure simulation experiments on source rock samples in the study area

[0079]

[0080] The maturity of the source rock sample is 0.67, and the amount of hydrocarbons discharged from immaturity to current maturity needs to be calculated. Therefore, the source rocks in the adjacent area of ​​the study area with organic geochemical characteristics (sedimentary environment, parent material type, organic matter abundance, organic matter composition, lithological characteristics, etc.) that are basically the same as the source rock and immature (Ro < 0.5%) were selected for thermal pressure simulation experiments and geochemical analysis. The analysis results are shown in Tables 3 and 4.

[0081] Table 3 Basic information of immature source rock samples

[0082] well name Depth(m) Lithology Ro(%) TOC(%) Kerogen Type G43 1972 Black shale 0.49 4.65 I

[0083] Table 4 Results of thermal pressure simulation experiments on immature source rock samples

[0084]

[0085]

[0086] The relationship between hydrocarbon generation rate and reflectivity Ro obtained from the experimental results of step 2 of this embodiment is as follows: Figure 3 As shown, the relationship function between hydrocarbon generation rate G and reflectivity Ro is obtained G = -40.94Ro 2 +364.16Ro-5.8287. The two sets of simulation experimental results with reflectances of source rocks in the study area of ​​0.74 and 1.59 respectively and the relationship between hydrocarbon production rate and reflectance were selected and substituted into formula (4) and formula (5) to calculate the original organic carbon TOC of source rocks in the study area. 原 =5.33%, the amount of hydrocarbons discharged by 100g of source rock in the study area before the current maturity is Q 排 '=503.59mg. The two sets of simulation experimental results and the relationship between hydrocarbon production rate and reflectivity of the source rock in the study area with reflectivity of 0.74 and 1.59 respectively were selected and substituted into formula (8) and formula (5) to calculate the original organic carbon TOC of the source rock in the study area. 原 =5.36%, the amount of hydrocarbons discharged by 100g of source rock in the study area before the current maturity is Q 排 '=503.59mg.

[0087] Comparing the results calculated using formula (4) and formula (8) respectively, it is shown that when calculating the original organic carbon, the error caused by using the simplified formula (8) is extremely small, and the calculation result is basically the same as that using the complete formula (4).

[0088] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0089] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of source rocks according to the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0090] According to an embodiment of the present invention, there is also provided a device for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock for implementing the above method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of a source rock. Figure 4 is a structural block diagram of an apparatus for determining hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock according to an embodiment of the present invention. Figure 4 As shown, the device for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock includes: an experimental module 42, a first determination module 44 and a second determination module 46. The device for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock is described below.

[0091] Experimental module 42 is used to conduct experiments on multiple homologous samples, measure the experimental hydrocarbon expulsion volume and residual hydrocarbon volume of each of the multiple homologous samples, and the reflectivity of each of the multiple homologous samples, wherein the multiple homologous samples all originate from the target source rocks in the target area, the reflectivity of each of the multiple homologous samples is the reflectivity of the multiple homologous samples after the respective temperature simulation experiments, and the reflectivity of each of the multiple homologous samples represents the respective maturity of the multiple homologous samples after the respective temperature simulation experiments.

[0092] The first determination module 44 is connected to the experimental module 42, and is used to determine the hydrocarbon production rates of multiple homologous samples at their respective maturities based on their respective reflectivities and a predetermined hydrocarbon production rate relationship function, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function represents the functional relationship between the reflectivity and the hydrocarbon production rate of the sample.

[0093] The second determination module 46 is connected to the first determination module 44, and is used to determine the total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturity, and the original organic carbon content of the target source rock based on the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion and residual hydrocarbon amounts of the multiple homologous samples, wherein the total hydrocarbon generation represents the total mass of hydrocarbon compounds produced by the samples, and the total hydrocarbon expulsion represents the total mass of hydrocarbon compounds expelled by the samples.

[0094] It should be noted that the above-mentioned experimental module 42, the first determination module 44 and the second determination module 46 correspond to steps S202 to S206 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment. It should be noted that the above-mentioned modules as part of the device can be run in the computer terminal 10 provided in the embodiment.

[0095] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one network device among multiple network devices of a computer network. The computer device includes a memory and a processor.

[0096] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the method and device for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, the above-mentioned method for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock is realized. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0097] The processor can call the information and application program stored in the memory through the transmission device to execute the following steps: conduct experiments on multiple homologous samples, measure the experimental hydrocarbon expulsion volume and residual hydrocarbon volume of each of the multiple homologous samples, and the reflectivity of each of the multiple homologous samples, wherein the multiple homologous samples are all derived from the target hydrocarbon source rock in the target area, the reflectivity of each of the multiple homologous samples is the reflectivity of the multiple homologous samples after the respective temperature simulation experiments, and the reflectivity of each of the multiple homologous samples represents the respective maturity of the multiple homologous samples after the respective temperature simulation experiments; according to the relationship between the reflectivity of each of the multiple homologous samples and the predetermined hydrocarbon production rate A function is used to determine the hydrocarbon production rates of multiple homologous samples at their respective maturities, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function represents the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; according to the hydrocarbon production rates of the multiple homologous samples at their respective maturities, the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples, the total hydrocarbon generation amount and the total hydrocarbon expulsion amount of the multiple homologous samples at their respective maturities, and the organic carbon content of the target source rock are determined, wherein the total hydrocarbon generation amount represents the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion amount represents the total mass of hydrocarbon compounds expelled by the sample.

[0098] Optionally, the total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturity, and the organic carbon content of the target source rock are determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined first formula, the amount of hydrocarbons expelled by the samples of the target mass before the experiment is determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples; the experimental hydrocarbon generation of the multiple homologous samples during the experiment is determined according to the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples respectively; the total hydrocarbon generation of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled by the samples of the target mass before the experiment and the experimental hydrocarbon generation amounts of the multiple homologous samples; the total hydrocarbon expulsion of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled by the samples of the target mass before the experiment and the experimental hydrocarbon expulsion amounts of the multiple homologous samples.

[0099] Optionally, the sum of the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples is the experimental hydrocarbon generation amount of the multiple homologous samples.

[0100] Optionally, the experimental hydrocarbon generation amounts of the multiple homologous samples are summed with the hydrocarbon amounts discharged by the sample of target mass before the experiment to obtain the total hydrocarbon generation amounts of the multiple homologous samples at their respective maturity levels.

[0101] Optionally, the organic carbon content of the target source rock is determined based on the hydrocarbon production rates of multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined second formula, the organic carbon content of the target source rock is determined based on the target mass, the hydrocarbon production rates of the multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples.

[0102] Optionally, the method also includes: obtaining the source rock area, average source rock thickness, and average source rock density of the target area; determining the average hydrocarbon production rate and average organic carbon content of the source rocks included in the target area; and determining the oil and gas generation in the target area based on the source rock area, average source rock thickness, average source rock density, average organic carbon content, and average hydrocarbon production rate.

[0103] Optionally, the hydrocarbon production rate relationship function is determined in the following manner: obtaining a plurality of similar samples of the same source, wherein the plurality of similar samples of the same source are all derived from similar source rocks obtained in an adjacent area, wherein the difference between the organic geochemical characteristics of the similar source rocks and the organic geochemical characteristics of the target source rocks is less than a predetermined threshold, and the distance between the adjacent area and the target area is within a predetermined range; conducting experiments on the plurality of similar samples of the same source, measuring the reflectivity of each of the plurality of similar samples of the same source, and the respective hydrocarbon production rates; determining, based on the respective reflectivity of the plurality of similar samples of the same source, and the respective hydrocarbon production rates, the relationship function between the hydrocarbon production rate and maturity of the similar source rocks as the hydrocarbon production rate relationship function.

[0104] By adopting the embodiment of the present invention, a scheme for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of source rocks is provided. By conducting experiments on multiple homologous samples, the experimental hydrocarbon expulsion and residual hydrocarbon amount of each of the multiple homologous samples, as well as the reflectivity of each of the multiple homologous samples are measured, wherein the multiple homologous samples all originate from the target source rocks in the target area, and the reflectivity of each of the multiple homologous samples is the reflectivity of the multiple homologous samples after each temperature simulation experiment, and the reflectivity of each of the multiple homologous samples represents the respective maturity of the multiple homologous samples after each temperature simulation experiment; based on the reflectivity of each of the multiple homologous samples and a predetermined hydrocarbon production rate relationship function, the hydrocarbon production rates of the multiple homologous samples at their respective maturity are determined, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function represents the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; based on the multiple homologous samples The total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturities, as well as the organic carbon content of the target source rock are determined by combining the hydrocarbon production rates of the samples at their respective maturities, the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples. The total hydrocarbon generation amount characterizes the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion amount characterizes the total mass of hydrocarbon compounds expelled by the sample. The dynamic relationship between the hydrocarbon generation amount and the hydrocarbon production rate is adopted to achieve the purpose of determining the total hydrocarbon generation amount of the sample according to the experimental hydrocarbon production rate, thereby achieving the technical effect of determining the total mass of hydrocarbon compounds generated by the sample at the current maturity, thereby solving the technical problem of inaccurate total hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of the source rock determined when the source rock with higher maturity is used for hot pressure experiment.

[0105] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0106] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of the source rock provided in the above embodiment.

[0107] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0108] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: conducting experiments on a plurality of homologous samples, measuring the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the plurality of homologous samples, and the reflectivity of each of the plurality of homologous samples, wherein the plurality of homologous samples are all derived from target hydrocarbon source rocks in the target area, the reflectivity of each of the plurality of homologous samples is the reflectivity of the plurality of homologous samples after the respective temperature simulation experiments, and the reflectivity of each of the plurality of homologous samples represents the respective maturity of the plurality of homologous samples after the respective temperature simulation experiments; and determining the hydrocarbon production rate according to the respective reflectivity of the plurality of homologous samples and the predetermined hydrocarbon production rate. A relationship function is used to determine the hydrocarbon production rates of multiple homologous samples at their respective maturity, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function characterizes the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples, the total hydrocarbon generation amount and the total hydrocarbon expulsion amount of the multiple homologous samples at their respective maturity, and the organic carbon content of the target source rock are determined, wherein the total hydrocarbon generation amount characterizes the total mass of hydrocarbon compounds produced by the sample, and the total hydrocarbon expulsion amount characterizes the total mass of hydrocarbon compounds expelled by the sample.

[0109] Optionally, the total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturity, and the organic carbon content of the target source rock are determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined first formula, the amount of hydrocarbons expelled by the samples of the target mass before the experiment is determined according to the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples; the experimental hydrocarbon generation of the multiple homologous samples during the experiment is determined according to the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples respectively; the total hydrocarbon generation of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled by the samples of the target mass before the experiment and the experimental hydrocarbon generation amounts of the multiple homologous samples; the total hydrocarbon expulsion of the multiple homologous samples at their respective maturity is determined according to the amount of hydrocarbons expelled by the samples of the target mass before the experiment and the experimental hydrocarbon expulsion amounts of the multiple homologous samples.

[0110] Optionally, the sum of the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples is the experimental hydrocarbon generation amount of the multiple homologous samples.

[0111] Optionally, the experimental hydrocarbon generation amounts of the multiple homologous samples are summed with the hydrocarbon amounts discharged by the sample of target mass before the experiment to obtain the total hydrocarbon generation amounts of the multiple homologous samples at their respective maturity levels.

[0112] Optionally, the organic carbon content of the target source rock is determined based on the hydrocarbon production rates of multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, including: when the masses of the multiple homologous samples are all target masses, based on a predetermined second formula, the organic carbon content of the target source rock is determined based on the target mass, the hydrocarbon production rates of the multiple homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples.

[0113] Optionally, the method also includes: obtaining the source rock area, average source rock thickness, and average source rock density of the target area; determining the average hydrocarbon production rate and average organic carbon content of the source rocks included in the target area; and determining the oil and gas generation in the target area based on the source rock area, average source rock thickness, average source rock density, average organic carbon content, and average hydrocarbon production rate.

[0114] Optionally, the hydrocarbon production rate relationship function is determined in the following manner: obtaining a plurality of similar samples of the same source, wherein the plurality of similar samples of the same source are all derived from similar source rocks obtained in an adjacent area, wherein the difference between the organic geochemical characteristics of the similar source rocks and the organic geochemical characteristics of the target source rocks is less than a predetermined threshold, and the distance between the adjacent area and the target area is within a predetermined range; conducting experiments on the plurality of similar samples of the same source, measuring the reflectivity of each of the plurality of similar samples of the same source, and the respective hydrocarbon production rates; determining, based on the respective reflectivity of the plurality of similar samples of the same source, and the respective hydrocarbon production rates, the relationship function between the hydrocarbon production rate and maturity of the similar source rocks as the hydrocarbon production rate relationship function.

[0115] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0116] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0118] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0119] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0120] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0121] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock, characterized in that: include: Conducting experiments on multiple homologous samples to measure the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the multiple homologous samples, as well as the reflectivity of each of the multiple homologous samples, wherein the multiple homologous samples are all derived from target source rocks in the target area, and the reflectivity of each of the multiple homologous samples is the reflectivity of each of the multiple homologous samples after each temperature simulation experiment, and the reflectivity of each of the multiple homologous samples represents the maturity of each of the multiple homologous samples after each temperature simulation experiment; Determining the hydrocarbon production rates of the plurality of homologous samples at their respective maturity levels according to the respective reflectivities of the plurality of homologous samples and a predetermined hydrocarbon production rate relationship function, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function represents the functional relationship between the reflectivity and the hydrocarbon production rate of the sample; The total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturities, and the original organic carbon content of the target source rock are determined based on the hydrocarbon production rates of the multiple homologous samples at their respective maturities, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the multiple homologous samples, wherein the total hydrocarbon generation amount represents the total mass of hydrocarbon compounds produced by the samples, and the total hydrocarbon expulsion amount represents the total mass of hydrocarbon compounds expelled by the samples.

2. The method according to claim 1, characterized in that Determining the total hydrocarbon generation and total hydrocarbon expulsion of the plurality of homologous samples at their respective maturity levels according to the hydrocarbon production rates of the plurality of homologous samples at their respective maturity levels, the experimental hydrocarbon expulsion and residual hydrocarbon amounts of the plurality of homologous samples respectively, comprises: In the case where the masses of the plurality of homologous samples are all target masses, based on a predetermined first formula, according to the hydrocarbon production rates of the plurality of homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the plurality of homologous samples, the amount of hydrocarbons expelled by the sample of the target mass before the experiment is determined; Determining the experimental hydrocarbon generation amount of each of the plurality of homologous samples during the experiment according to the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the plurality of homologous samples; Determine the total hydrocarbon generation amount of the plurality of homologous samples at their respective maturity levels according to the amount of hydrocarbons discharged by the sample of the target mass before the experiment and the experimental hydrocarbon generation amount of each of the plurality of homologous samples; The total hydrocarbon discharge amount of the plurality of homologous samples at their respective maturity levels is determined according to the hydrocarbon discharge amount of the sample of the target quality before the experiment and the experimental hydrocarbon discharge amount of each of the plurality of homologous samples.

3. The method according to claim 2, characterized in that The sum of the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples is the experimental hydrocarbon generation amount of the multiple homologous samples.

4. The method according to claim 2, characterized in that: The experimental hydrocarbon generation amounts of the multiple homologous samples are summed with the hydrocarbon amounts discharged by the sample of the target mass before the experiment to obtain the total hydrocarbon generation amounts of the multiple homologous samples at their respective maturity levels.

5. The method according to claim 1, characterized in that Determining the organic carbon content of the target source rock according to the hydrocarbon production rates of the plurality of homologous samples at their respective maturity, the experimental hydrocarbon expulsion amounts and the residual hydrocarbon amounts of the plurality of homologous samples, comprises: When the masses of the multiple homologous samples are all target masses, the organic carbon content of the target source rock is determined based on a predetermined second formula according to the target mass, the hydrocarbon production rates of the multiple homologous samples at their respective maturity, and the experimental hydrocarbon expulsion amounts and residual hydrocarbon amounts of the multiple homologous samples.

6. The method according to claim 1, characterized in that Also includes: Obtaining the source rock area, average source rock thickness, and average source rock density of the target area; Determining the average hydrocarbon production rate and average organic carbon content of the source rocks included in the target area; The oil and gas generation amount of the target area is determined based on the source rock area, the average source rock thickness, the average source rock density, the average organic carbon content and the average hydrocarbon production rate.

7. The method according to any one of claims 1 to 6, characterized in that: The hydrocarbon production rate relationship function is determined by the following method: Acquire a plurality of homologous similar samples, wherein the plurality of homologous similar samples are all derived from similar source rocks obtained in adjacent areas, wherein the difference between the organic geochemical characteristics of the similar source rocks and the organic geochemical characteristics of the target source rocks is less than a predetermined threshold, and the distance between the adjacent area and the target area is within a predetermined range; Conducting experiments on the multiple homologous and similar samples to measure the reflectivity and hydrocarbon production rates of the multiple homologous and similar samples; According to the respective reflectivities and hydrocarbon production rates of the plurality of similar samples of the same origin, a relationship function between the hydrocarbon production rate and maturity of the similar source rocks is determined as the hydrocarbon production rate relationship function.

8. A device for determining the hydrocarbon generation, hydrocarbon expulsion and original organic carbon content of a source rock, characterized in that: include: An experimental module, used to conduct experiments on multiple homologous samples, measure the experimental hydrocarbon expulsion amount and residual hydrocarbon amount of each of the multiple homologous samples, and the reflectivity of each of the multiple homologous samples, wherein the multiple homologous samples are all derived from target source rocks in a target area, and the reflectivity of each of the multiple homologous samples is the reflectivity of each of the multiple homologous samples after each temperature simulation experiment, and the reflectivity of each of the multiple homologous samples represents the maturity of each of the multiple homologous samples after each temperature simulation experiment; A first determination module is used to determine the hydrocarbon production rates of the plurality of homologous samples at their respective maturity levels according to the respective reflectivities of the plurality of homologous samples and a predetermined hydrocarbon production rate relationship function, wherein the hydrocarbon production rate is the mass of hydrocarbon compounds produced by a unit mass of the sample, and the hydrocarbon production rate relationship function represents a functional relationship between the reflectivity and the hydrocarbon production rate of the sample; The second determination module determines the total hydrocarbon generation and total hydrocarbon expulsion of the multiple homologous samples at their respective maturity, and the original organic carbon content of the target source rock based on the hydrocarbon production rates of the multiple homologous samples at their respective maturity, the experimental hydrocarbon expulsion and residual hydrocarbon amounts of the multiple homologous samples, wherein the total hydrocarbon generation represents the total mass of hydrocarbon compounds produced by the samples, and the total hydrocarbon expulsion represents the total mass of hydrocarbon compounds expelled by the samples.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of the source rock as described in any one of claims 1 to 7.

10. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is run, the processor executes the method for determining the hydrocarbon generation amount, hydrocarbon expulsion amount and original organic carbon content of the source rock as described in any one of claims 1 to 7.

Images