Method and system for judging type of oil and gas reservoir

Abstract

The invention discloses a method and system for judging the type of an oil and gas reservoir, and the method comprises the steps: calculating a plurality of component content characteristic indexes at different positions according to the logging gas logging distribution data of a test well in a target work area; according to the multiple component content characteristic indexes, constructing an oil and gas reservoir type identification chart; and according to the actual drilling gas logging value of the drilling well or the drilling well to be completed in the target work area, the oil and gas reservoir type identification chart is utilized to determine the oil and gas reservoir type of the corresponding position. The accuracy of determining the type of the oil and gas reservoir before well completion is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploration, and in particular to a method and system for judging the type of oil and gas reservoir. BACKGROUND

[0002] There are rich oil and gas resources in the northwest of China, and oil and gas reservoirs with complex fluid properties have been found, including condensate gas reservoirs, gas reservoirs, light oil reservoirs, and volatile oil reservoirs. In recent years, the newly deployed industrial oil and gas flow in Well Xibei 1 (currently completed) shows good oil and gas display. Because the target layer in this work area is deep and the reservoir properties are poor, most of the drilled wells cannot be directly put into production, and reservoir reconstruction is needed during well completion to obtain scale production capacity. Therefore, the identification of the type of oil and gas reservoir before well completion is particularly important, directly affecting the well completion method and reservoir reconstruction method.

[0003] During the actual drilling process, the mud logging team often uses gas logging technology to judge the type of oil and gas reservoir by plotting points on the triangular chart, ratio chart, logarithmic chart, and 3H chart. However, the conclusions obtained by these methods are often inconsistent, and the underground fluid properties cannot be accurately identified, so that accurate and timely well completion plans cannot be provided. In addition, these methods have strong regional applicability, and the required parameter calculation formula is not intuitive, which is less readable for drilling tracking geologists and cannot verify the accuracy of the conclusions.

[0004] In the technical solution of the existing patent literature (patent number CN116104467A) "Method for judging fluid properties of oil and gas reservoirs based on gas logging", the underground fluid sample is first obtained, and the results of its analysis and testing are used to identify the gas logging chart according to the gas logging method. This method is not suitable for wells where underground fluid samples cannot be obtained and the stage of wells where underground fluid samples have not been obtained.

[0005] In addition, in the existing patent literature (patent number CN103510946A) "Method for evaluating reservoir fluid properties based on gas logging data", a gas logging data evaluation method with high agreement rate for the interpretation of secondary modified oil and gas reservoirs is provided. The agreement rate of the interpretation of primary oil and gas reservoirs is not demonstrated. This scheme improves the 3H chart and the triangular chart, making it more suitable for the research work area mentioned in the patent.

[0006] However, the above-mentioned existing patent literatures have regional limitations and cannot be applied in actual drilling in the Yakela faulted salient in the northwest of China. Therefore, the existing technology needs to establish an oil and gas reservoir type determination scheme suitable for various geological conditions to provide more reliable and timely well completion basis for well completion plans. SUMMARY

[0007] The present application aims to provide a type determination scheme for oil and gas reservoirs suitable for various geological conditions, so as to provide more reliable and timely well completion basis for well completion schemes.

[0008] To solve the above technical problems, the present application provides a method for determining the type of an oil and gas reservoir, comprising: calculating a plurality of component content characteristic indexes at different positions according to the logging gas logging distribution data of a test well in a target work area; constructing an oil and gas reservoir type identification chart according to the plurality of component content characteristic indexes; and determining the type of an oil and gas reservoir at a corresponding position by using the oil and gas reservoir type identification chart according to the actual drilling gas logging value of a drilling well being drilled or a drilling well to be completed in the target work area.

[0009] Preferably, the plurality of component content characteristic indexes include a natural gas dry coefficient, a C2 and above component content, a C3 and above component content, a C1 proportion, and a C2 and above content proportion.

[0010] Preferably, the plurality of component content characteristic indexes are calculated by using the following expression:

[0011]

[0012] wherein M1 represents the natural gas dry coefficient, M2 represents the C2 and above component content, M3 represents the C3 and above component content, M4 represents the C1 proportion, and M5 represents the C2 and above content proportion; C1 represents the component content of methane, C2 represents the component content of ethane, C3 represents the component content of propane, C4 represents the component content of butane, and C5 represents the component content of pentane.

[0013] Preferably, in the step of constructing an oil and gas reservoir type identification chart according to the plurality of component content characteristic indexes, the step comprises: constructing an interaction chart between the natural gas dry coefficient and the C2 and above component content, the C3 and above component content, the C1 proportion, and the C2 and above content proportion, respectively, and dividing different oil and gas reservoir type regions on each interaction chart; and according to the high pressure physical property experimental analysis results based on crude oil or natural gas, the gas-oil ratio, and the natural gas relative density of the target work area, dividing different oil and gas reservoir type regions on each interaction chart and analyzing the gas logging identification accuracy, and selecting the interaction chart with the highest accuracy as the oil and gas reservoir type identification chart.

[0014] Preferably, the interaction chart between the natural gas dry coefficient and the C3 and above component content is used as the oil and gas reservoir type identification chart.

[0015] Preferably, the oil and gas reservoir types include dry gas reservoirs, wet gas reservoirs, condensate gas reservoirs and oil reservoirs, and in the step of determining the oil and gas reservoir types at corresponding positions by using the oil and gas reservoir type identification chart according to the real drilling gas logging values of the drilling wells being drilled or to be completed in the target work area, the step includes: calculating corresponding measured component content features according to the real drilling gas logging values, the measured component content features being two intersecting features in the oil and gas reservoir type identification chart; projecting the measured component content feature values into the oil and gas reservoir type identification chart, and recording the oil and gas reservoir types where the current data fall points are located.

[0016] Preferably, the method further includes: collecting gas logging abnormal values of the test wells in the target work area during the real drilling process and statistically analyzing the gas logging abnormal values according to layer series to form the logging gas logging distribution data of the same geological unit.

[0017] In another aspect, the embodiment of the present application provides a computer readable storage medium containing a series of instructions for executing the method steps as described above.

[0018] In addition, the embodiment of the present application further provides a system for determining oil and gas reservoir types, which includes: an index calculation module configured to calculate a plurality of component content feature indexes of different positions according to logging gas logging distribution data of test wells in a target work area; an identification chart generation module configured to construct an oil and gas reservoir type identification chart according to the plurality of component content feature indexes; and an oil and gas reservoir type identification module configured to determine oil and gas reservoir types at corresponding positions by using the oil and gas reservoir type identification chart according to real drilling gas logging values of drilling wells being drilled or to be completed in the target work area.

[0019] Preferably, the plurality of component content feature indexes include a natural gas dry coefficient, a C2 or above component content, a C3 or above component content, a C1 proportion and a C2 or above content proportion.

[0020] Compared with the prior art, one or more embodiments in the above solution can have the following advantages or beneficial effects:

[0021] The present application provides a method and system for determining oil and gas reservoir types. The method and system are suitable for determining oil and gas reservoir types during drilling and logging or before completion, and the gas logging identification chart established can clearly represent the oil and gas reservoir types of the same geological unit. From the actual application effect, the present application improves the accuracy of the determination of oil and gas reservoir types before completion, provides timely and reliable completion basis for the completion scheme, meets the production needs, has good practical application value, and is convenient for drilling tracking personnel to operate and apply.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the steps of a method for determining the type of oil and gas reservoir according to an embodiment of this application.

[0025] Figure 2 This is an example diagram showing the interaction between the natural gas drying coefficient and the content of components above C2 in the method for determining the type of oil and gas reservoir according to an embodiment of this application.

[0026] Figure 3 This is an example diagram illustrating the interaction between the natural gas drying coefficient and the content of components above C3 in the method for determining oil and gas reservoir type according to an embodiment of this application.

[0027] Figure 4 This is an example diagram showing the interaction between the natural gas drying coefficient and the C1 ratio in the method for determining oil and gas reservoir type according to an embodiment of this application.

[0028] Figure 5 This is an example diagram illustrating the interaction between the natural gas drying coefficient and the proportion of C2 and above content in the method for determining oil and gas reservoir type according to embodiments of this application.

[0029] Figure 6 This is a block diagram of a system for determining the type of oil and gas reservoir according to an embodiment of this application. Detailed Implementation

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that, as long as there is no conflict, the various embodiments and features in the various embodiments of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0031] Furthermore, the steps illustrated in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than that shown here.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0033] To solve the technical problems in the background art, the embodiments of the present application propose a method and system for judging the type of oil and gas reservoirs. The method and system collect the oil and gas show conditions of the same formation unit before drilling and completion, determine the type of oil and gas reservoirs through multi-point and big data, and guide the designation of the completion plan, thereby solving the problems of the applicability, accuracy, timeliness, easy interpretation and easy operation of the chart in the prior art.

[0034] Example One

[0035] Figure 1 The steps of the method for judging the type of oil and gas reservoirs according to the embodiments of the present application are shown in the flowchart. The specific steps of the method for judging the type of oil and gas reservoirs (also referred to as "oil and gas reservoir type judgment method") according to the embodiments of the present application are described below with reference to the flowchart. Figure 1 The specific steps of the method for judging the type of oil and gas reservoirs (also referred to as "oil and gas reservoir type judgment method") according to the embodiments of the present application are described below with reference to the flowchart.

[0036] In step S110, according to the gas logging distribution data of the test wells in the target work area, the content characteristic indexes of multiple components at different positions in the work area are calculated. It should be noted that the test well is a drilled well in the target work area that has completed drilling and logging, i.e., a drilled well that has tested and obtained industrial capacity.

[0037] In step S110, first, the gas logging abnormal values of several test wells in the target work area during actual drilling are collected, and the collected gas logging abnormal values are counted by layer series to form the gas logging distribution data of the same formation unit. Specifically, during drilling construction, if hydrocarbon substances are returned to the wellhead, the gas logging component value will be higher than the background value, at which time, the gas logging will be abnormal, indicating that an oil and gas reservoir may be drilled. Therefore, the gas logging abnormal values need to be counted in step S110 to preliminarily judge the type of the drilled oil and gas reservoir using the gas logging abnormal values.

[0038] After obtaining the gas logging distribution data of the same formation unit, according to the gas logging data, the content characteristic indexes of multiple components at different positions in the same formation unit are calculated according to the natural gas discrimination standard, i.e., five component content discrimination parameters, including the natural gas dry coefficient, C2+(%), C3+(%), C1 / (C2+C3), and C2+ / C1(%).

[0039] In the embodiment of the present application, the multiple component content characteristic indexes include: a natural gas dry coefficient (M1), a C2 or more component content (M2), a C3 or more component content (M3), a C1 proportion (M4), and a C2 or more content proportion (M5).

[0040] Specifically, the multiple component content characteristic indexes are calculated by using the following expressions:

[0041]

[0042] Wherein, M1 represents the natural gas dry coefficient, M2 represents the C2 or more component content, M3 represents the C3 or more component content, M4 represents the C1 proportion, M5 represents the C2 or more content proportion, C1 represents the component content of methane, C2 represents the component content of ethane, C3 represents the component content of propane, C4 represents the component content of butane (sum of normal and iso isomers), and C5 represents the component content of pentane (sum of normal and iso isomers).

[0043] After the calculation of the multiple component content characteristic indexes at different positions in the same formation unit is completed, the process goes to step S120.

[0044] In step S120, the multiple component content characteristic indexes calculated in step S110 are used to construct a reservoir type identification chart.

[0045] In step S120, first, the multiple component content characteristic indexes (values) at different positions are used to construct the interactive diagrams between the natural gas dry coefficient and the C2 or more component content, the C3 or more component content, the C1 proportion, and the C2 or more content proportion, respectively, and different reservoir type regions are divided on each interactive diagram.

[0046] The interactive diagram between the natural gas dry coefficient and the C2 or more component content (i.e., the first parameter interactive diagram), the interactive diagram between the natural gas dry coefficient and the C3 or more component content (i.e., the second parameter interactive diagram), the interactive diagram between the natural gas dry coefficient and the C1 proportion (i.e., the third parameter interactive diagram), and the interactive diagram between the natural gas dry coefficient and the C2 or more content proportion (i.e., the fourth parameter interactive diagram) are constructed, respectively. Then, different reservoir type regions are divided on each interactive diagram according to the distribution of data points on each interactive diagram and the actual reservoir type at the corresponding position.

[0047] In the embodiment of the present application, the reservoir types include dry gas reservoirs, wet gas reservoirs, condensate gas reservoirs, and oil reservoirs.

[0048] Specifically, a plurality of interactive charts for gas logging identification are constructed: four interactive charts are established with C2+(%) and C3+(%) as the horizontal coordinates and the natural gas dry coefficient as the vertical coordinate (see Figure 2 , Figure 3 , Figure 4 and Figure 5 ), and each interactive chart is divided into the following reservoir type regions: dry gas reservoir, wet gas reservoir, condensate gas reservoir and oil reservoir.

[0049] Then, step S120 also analyzes the gas logging identification accuracy of each interactive chart according to the high-pressure physical property experimental analysis results of crude oil or natural gas, the gas-oil ratio and the relative density of natural gas of the target work area, and selects the interactive chart with the highest accuracy as the oil and gas reservoir type identification chart.

[0050] The accuracy of the oil and gas reservoir type identification result is evaluated according to the high-pressure physical property experimental results of crude oil or natural gas, the production gas-oil ratio and the relative density of natural gas of the tested well after drilling. The high-pressure physical property experiment of crude oil or natural gas gives a conclusion of which specific type of oil and gas reservoir type, i.e., the oil and gas reservoir type identification result, is among the oil reservoir, condensate gas reservoir, wet gas reservoir and dry gas reservoir. Specifically, when the production gas-oil ratio is ≤550m 3 / m 3 , the oil and gas reservoir type is an oil reservoir; when 550m 3 / m 3 < production gas-oil ratio ≤18000m 3 / m 3 , the oil and gas reservoir type is a condensate gas reservoir; when the production gas-oil ratio is >18000m 3 / m 3 , the oil and gas reservoir type is a wet gas reservoir. When the relative density of natural gas is >0.7, the oil and gas reservoir type is an oil reservoir; when 0.6≤relative density of natural gas≤0.7, the oil and gas reservoir type is a condensate gas reservoir or a wet gas reservoir; when the relative density of natural gas is <0.6, the oil and gas reservoir type is a dry gas reservoir.

[0051] If the gas logging chart identification result of the tested well during the drilling period is consistent with the oil and gas reservoir type identification result obtained according to the high-pressure physical property experimental results of crude oil or natural gas, the production gas-oil ratio and the relative density of natural gas after drilling, it is determined that the chart is the chart with the highest accuracy, i.e., the gas logging value of the drilled well during the drilling period on the chart is consistent with the oil and gas reservoir type identification result determined after drilling, and it is determined that the chart is the chart with the highest accuracy for identifying the oil and gas reservoir type by using the gas logging during the drilling.

[0052] In the embodiment of the present application, the interactive chart (i.e., the second parameter interactive chart) between the natural gas dry coefficient and the content of components above C3 is used as the oil and gas reservoir type identification chart.

[0053] After the optimal oil and gas reservoir type identification chart is selected, step S130 is entered.

[0054] Step S130 determines the oil and gas reservoir type at different (depth) positions in the specified horizon according to the real drilling gas logging values of the drilled wells or the to-be-predicted wells to be completed in the target work area, using the oil and gas reservoir type identification chart generated in step S120.

[0055] In step S130, the measured component content features at different positions are first calculated according to the real drilling gas logging values of the to-be-predicted wells. The measured component content features are two intersecting component features in the oil and gas reservoir type identification chart. For example, when the oil and gas reservoir type identification chart is an interactive chart between the natural gas dryness coefficient and the component content above C3, step S130 needs to calculate the two component features of the natural gas dryness coefficient and the component content above C3.

[0056] Then, step S130 also projects the one or more sets of measured component content feature values currently calculated into the oil and gas reservoir type identification chart generated in step S120, records the oil and gas reservoir type where the current data landing point is located, and thus determines the oil and gas reservoir type at the current data landing point position as the oil and gas reservoir type at the current work area position.

[0057] Example Two

[0058] Based on the above oil and gas reservoir type determination method, the embodiment of the present application also provides a computer readable storage medium, and the storage medium stores a computer program. The computer program is executed to run a method for determining the type of an oil and gas reservoir. The computer program can run computer instructions, and the computer instructions include computer program codes which can be in the form of source code, object code, executable files or some intermediate forms, etc.

[0059] The computer readable storage medium can include any entity or device capable of carrying computer program codes, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0060] It should be noted that the content contained in the computer readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to the requirements of legislation and patent practice, the computer readable storage medium does not include electrical carrier signals and telecommunication signals.

[0061] Example Three

[0062] Based on the oil and gas reservoir type judgment method, the embodiment of the present application further provides a system for judging the oil and gas reservoir type (also referred to as an "oil and gas reservoir type judgment system"). The oil and gas reservoir type judgment system is used to implement the oil and gas reservoir type judgment method.

[0063] Figure 6 The module block diagram of the system for judging the oil and gas reservoir type of the embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the oil and gas reservoir type judgment system of the embodiment of the present application comprises an index calculation module 61, an identification chart generation module 62 and an oil and gas reservoir type identification module 63. Figure 6

[0064] Specifically, the index calculation module 61 is implemented according to the method described in the above step S110, and is configured to calculate a plurality of component content characteristic indexes at different positions according to the logging gas logging distribution data of the test well in the target work area; the identification chart generation module 62 is implemented according to the method described in the above step S120, and is configured to construct an oil and gas reservoir type identification chart according to the plurality of component content characteristic indexes; and the oil and gas reservoir type identification module 63 is implemented according to the method described in the above step S130, and is configured to determine the oil and gas reservoir type at the corresponding position by using the oil and gas reservoir type identification chart according to the actual drilling gas logging value of the well being drilled or the well to be completed in the target work area.

[0065] In one embodiment, the plurality of component content characteristic indexes comprises a natural gas dry coefficient, a C2 or above component content, a C3 or above component content, a C1 proportion and a C2 or above content proportion.

[0066] The present application discloses a method and system for judging the oil and gas reservoir type. The method and system are suitable for determining the oil and gas reservoir type in the drilling and logging process or before completion, and the established gas logging identification chart can clearly characterize the oil and gas reservoir type of the same geological unit. From the actual application effect, the present application improves the accuracy of the oil and gas reservoir type determination before completion, provides a timely and reliable completion basis for the completion scheme, meets the production needs, has good practical application value, and is convenient for drilling tracking personnel to operate and apply.

[0067] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0068] ​In the description of the application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0069] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] It should be understood that the embodiments disclosed in the present application are not limited to the specific structure, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those skilled in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing the specific embodiments and do not mean limitation.

[0071] The phrase "one embodiment" or "an embodiment" appearing in the specification means that the specific feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the phrase "one embodiment" or "an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment.

[0072] Although the embodiments disclosed in the present application are as described above, the content described is only the embodiments adopted for the purpose of facilitating the understanding of the present application, and is not intended to limit the present application. Any person skilled in the art of the present application can make any modification and change in the form and details without departing from the spirit and scope of the present application, but the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A method for determining the type of a hydrocarbon reservoir, characterized in that, The method comprises the following steps: According to the gas logging distribution data of the test wells in the target work area, calculate the content characteristic indexes of multiple components at different positions; According to the content characteristic indexes of multiple components, construct a reservoir type identification chart; According to the actual drilling gas logging values of the drilling wells in the target work area, use the reservoir type identification chart to determine the reservoir type at the corresponding position.

2. The method of claim 1, wherein, The content characteristic indexes of multiple components include the natural gas dry coefficient, the content of components above C2, the content of components above C3, the proportion of C1, and the proportion of content above C2.

3. The method of claim 2, wherein, The content characteristic indexes of multiple components are calculated by using the following expressions: Wherein, M1 represents the natural gas dry coefficient, M2 represents the content of components above C2, M3 represents the content of components above C3, M4 represents the proportion of C1, and M5 represents the proportion of content above C2.

4. The method according to claim 2 or 3, characterized in that, In the step of constructing a reservoir type identification chart according to the content characteristic indexes of multiple components, the following steps are included: Construct the interaction chart between the natural gas dry coefficient and the content of components above C2, the content of components above C3, the proportion of C1, and the proportion of content above C2, respectively, and divide different reservoir type areas on each interaction chart; According to the high pressure physical property experimental analysis results based on crude oil or natural gas, gas-oil ratio, and natural gas relative density about the target work area, divide different reservoir type areas on each interaction chart and analyze the accuracy of gas logging identification, and select the interaction chart with the highest accuracy as the reservoir type identification chart.

5. The method of claim 4, wherein, The interaction chart between the natural gas dry coefficient and the content of components above C3 is selected as the reservoir type identification chart.

6. The method according to any one of claims 1 to 5, characterized in that, The reservoir types include dry gas reservoir, wet gas reservoir, condensate gas reservoir, and oil reservoir. In the step of determining the reservoir type at the corresponding position according to the actual drilling gas logging values of the drilling wells in the target work area by using the reservoir type identification chart, the following steps are included: According to the actual drilling gas logging values, calculate the corresponding measured component content characteristics, which are two characteristics in the reservoir type identification chart; 7. The method according to any one of claims 1 to 6, characterized in that, Project the measured component content characteristic values into the reservoir type identification chart, and record the reservoir type where the current data falls. The method further comprises:

8. A computer-readable storage medium, characterized in that, Collect the gas logging abnormal values of several test wells in the target work area during actual drilling, and statistically analyze the gas logging abnormal values by layer, to form the gas logging distribution data of the same stratum unit.

9. A system for determining the type of a hydrocarbon reservoir, characterized by It contains a series of instructions for executing the method steps as claimed in any one of claims 1-7. The method comprises the following steps: An index calculation module configured to calculate the content characteristic indexes of multiple components at different positions according to the gas logging distribution data of the test wells in the target work area; An identification chart generation module configured to construct a reservoir type identification chart according to the content characteristic indexes of multiple components; An index calculation module configured to calculate the content characteristic indexes of multiple components at different positions according to the gas logging distribution data of the test wells in the target work area; An identification chart generation module configured to construct a reservoir type identification chart according to the content characteristic indexes of multiple components; A hydrocarbon reservoir type identification module is configured to determine the hydrocarbon reservoir type at a corresponding position by using the hydrocarbon reservoir type identification chart according to the actual drilling gas logging value of a drilling well being drilled or to be completed in the target work area.

10. The system of claim 9, wherein, The multiple component content characteristic indexes include a natural gas dry coefficient, a C2 or above component content, a C3 or above component content, a C1 proportion, and a C2 or above content proportion.

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