Method and device for predicting natural energy of undeveloped fault block oil reservoir

Abstract

The invention discloses a method and device for predicting natural energy of an undeveloped fault block oil reservoir. The method comprises the steps that fault development characteristics, natural water body multiples, reservoir connectivity physical properties and scores of differences between original pressure and saturation pressure of the undeveloped fault block oil reservoir are determined according to related geological information of the undeveloped fault block oil reservoir; determining a natural energy comprehensive factor value of the undeveloped fault block oil reservoir by utilizing a weighting method; and determining the natural energy of the undeveloped fault block oil reservoir according to the natural energy comprehensive factor value.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and in particular to a method and device for predicting the natural energy of undeveloped fault block reservoirs. Background Art

[0002] Many oil and gas blocks discovered overseas are fault-block reservoirs, which are an important part of overseas equity production. For fault-block reservoirs, natural energy evaluation is a very important work link. Determining the best development method for the reservoir, whether it is necessary to use water injection and gas injection to supplement energy, and predicting the recovery rate all require accurate evaluation of natural energy as a prerequisite.

[0003] The traditional method for evaluating the natural energy of fault block reservoirs mainly uses the chart method, that is, the classification diagram of the relationship between the formation pressure drop value and the elastic production ratio after the 1% geological reserves are produced. However, this method requires a long period of actual dynamic production data. Since undeveloped fault block reservoirs often lack actual dynamic data, this method cannot be used to evaluate natural energy. However, undeveloped fault block reservoirs also need to reasonably evaluate natural energy, which is conducive to better formulating development plans and guiding development practices. Summary of the invention

[0004] The inventors found that:

[0005] There are many factors that affect the natural energy of fault-block reservoirs, including fault shielding characteristics, sedimentary characteristics, reservoir connectivity, reservoir physical properties, original pressure, saturation pressure, and natural water body size. To evaluate the natural energy of fault-block reservoirs, it is necessary to clarify the main controlling factors and the order of their influence on the natural energy of fault-block reservoirs.

[0006] So far, no one has conducted natural energy evaluation of undeveloped fault-block reservoirs. Therefore, how to evaluate the natural energy of undeveloped fault-block reservoirs has become a key issue that needs to be solved urgently.

[0007] The present application provides a method and device for predicting the natural energy of an undeveloped fault-block oil reservoir. The method calculates the natural energy comprehensive factor value of the undeveloped fault-block oil reservoir, and then determines the natural energy of the undeveloped fault-block oil reservoir, thereby obtaining a relatively reasonable assessment of the natural energy of the undeveloped fault-block oil reservoir.

[0008] In a first aspect, the present application provides a method for predicting the natural energy of an undeveloped fault block reservoir, the method comprising:

[0009] According to the relevant geological information of the undeveloped fault-block reservoir, the fault development characteristics, natural water body multiples, reservoir connectivity properties, and the score of the difference between the original pressure and the saturation pressure of the undeveloped fault-block reservoir are determined respectively;

[0010] Determining the natural energy comprehensive factor value of the undeveloped fault block reservoir by using a weighted method;

[0011] The natural energy of the undeveloped fault block reservoir is determined according to the natural energy comprehensive factor value.

[0012] In a second aspect, an embodiment of the present invention further provides a device for predicting the natural energy of undeveloped fault-block oil reservoirs, the device comprising: a memory and a processor; the memory is used to store a program for establishing a method for predicting the natural energy of undeveloped fault-block oil reservoirs, and the processor is used to read and execute the program for predicting the natural energy of undeveloped fault-block oil reservoirs, and execute any one of the methods described in the above embodiments.

[0013] In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium having a data processing program stored thereon, and the data processing program is executed by a processor to perform the method for predicting natural energy of undeveloped fault block reservoirs as described in any one of the above embodiments.

[0014] Compared with the related art, the present application provides a method and device for predicting the natural energy of an undeveloped fault block oil reservoir, the method comprising: determining the fault development characteristics, natural water body multiples, reservoir connectivity properties, and the score of the difference between the original pressure and the saturation pressure of the undeveloped fault block oil reservoir according to the relevant geological information of the undeveloped fault block oil reservoir; determining the natural energy comprehensive factor value of the undeveloped fault block oil reservoir by using a weighted method; and determining the natural energy of the undeveloped fault block oil reservoir according to the natural energy comprehensive factor value. The present application calculates the natural energy comprehensive factor value of the undeveloped fault block oil reservoir, and then determines the natural energy of the undeveloped fault block oil reservoir, thereby obtaining a relatively reasonable assessment of the natural energy of the undeveloped fault block oil reservoir.

[0015] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0017] Figure 1 This is a flow chart of a method for predicting natural energy of undeveloped fault block reservoirs according to an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of a device for predicting the natural energy of undeveloped fault block reservoirs according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is apparent to those of ordinary skill in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0020] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0021] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0022] The embodiment of the present invention provides a method for predicting the natural energy of undeveloped fault block reservoirs, such as Figure 1 As shown, the method includes steps S100-S120:

[0023] S100: Determine the fault development characteristics, natural water body multiples, reservoir connectivity properties, and the score of the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoir according to the relevant geological information of the undeveloped fault block reservoir;

[0024] S110: Determine the natural energy comprehensive factor value of the undeveloped fault block reservoir by using a weighted method;

[0025] S120: Determine the natural energy of the undeveloped fault block reservoir according to the natural energy comprehensive factor value.

[0026] In an exemplary embodiment, based on the actual dynamic data of multiple fault-block reservoirs that have been developed in the database, the natural energy of each fault-block reservoir can be evaluated using a conventional chart method, which uses a classification chart of the relationship between the formation pressure drop value and the elastic production ratio after producing one percent of the geological reserves.

[0027] In an exemplary embodiment, the process of determining the natural energy water body multiple is:

[0028] The natural water influx coefficient and natural water influx volume of each developed fault-block reservoir are calculated using hydrodynamic methods;

[0029] Calculate the volume of the natural water body according to the natural water intrusion coefficient and the natural water intrusion amount;

[0030] The volume of the natural water body is ratioed to the volume of the oil reservoir to determine the natural water body multiple.

[0031] In an exemplary embodiment, the fault development characteristics, reservoir configuration, original pressure and saturation pressure difference, etc. of each developed fault-block reservoir are determined.

[0032] In an exemplary embodiment, the fault development characteristics mainly include two aspects, namely the number of faults and the fault sealing property. The number of faults per unit area in the reservoir is determined by structural interpretation. The more faults per unit area, the stronger the fault sealing property, and the weaker the natural energy of the fault block reservoir is.

[0033] In an exemplary embodiment, the reservoir configuration study mainly uses the sedimentary microfacies of the reservoir to characterize it, and the sedimentary microfacies of the reservoir is determined through the interpretation results of conventional seismic data and geological analysis; the reservoir configuration can guide the understanding of the connectivity and physical properties of the reservoir.

[0034] In an exemplary embodiment, the difference between the original pressure and the saturation pressure is obtained by respectively obtaining the original pressure and the saturation pressure of the undeveloped fault block reservoir through high pressure testing; and the difference between the original pressure and the saturation pressure is calculated.

[0035] In an exemplary embodiment, the natural energy of the developed fault block reservoir is graded and assigned a percentage. The assignment standard can be determined according to the specific situation, for example: a score of 0 to 25 corresponds to weak natural energy, a score of 25 to 50 corresponds to average natural energy, a score of 50 to 75 corresponds to strong natural energy, and a score of 75 to 100 corresponds to very strong natural energy. According to the above-mentioned percentage-based grading assignment, the natural energy of each developed fault block reservoir is scored and assigned a percentage.

[0036] The fault development characteristics, natural water body multiples, reservoir connectivity properties, original pressure and saturation pressure differences can be scored according to the corresponding scoring standards, and the scoring range of each evaluation parameter is 0-100.

[0037] Specifically: Fault development characteristics are mainly characterized by the number of faults and fault blocking properties. The more faults there are and the stronger the fault blocking properties are, the lower the score is, and vice versa. Fault development characteristics can be quantitatively characterized by the weighted average SGR of the faults. The scoring range is 0-100. SGR < 11 corresponds to a score of 100, SGR > 40 corresponds to a score of 0, and SGR 11 to 40 can be obtained by the difference method (40-SGR) * 100 / (40-11) to obtain the corresponding score.

[0038] The natural water body multiples of 0 to 10 correspond to the score range of 0 to 25, 10 to 30 correspond to the score range of 25 to 50, 30 to 50 correspond to the score range of 50 to 75, and above 50 corresponds to the score range of 75 to 100.

[0039] The physical property of reservoir connectivity can be quantitatively characterized by reservoir permeability, which can be obtained through well logging interpretation. The permeability of 0-100mD corresponds to a score range of 0-25, the permeability of 100-500mD corresponds to a score range of 25-50, the permeability of 500-1000mD corresponds to a score range of 50-75, and the permeability above 1000mD corresponds to a score range of 75-100.

[0040] The difference between the original pressure and the saturated pressure of 0 to 5 MPa corresponds to a score range of 0 to 25, 5 to 10 MPa corresponds to a score range of 25 to 50, 10 to 15 MPa corresponds to a score range of 50 to 75, and above 15 MPa corresponds to a score range of 75 to 100.

[0041] In an exemplary embodiment, each undeveloped fault block reservoir is scored for its fault development characteristics, natural water body multiples, reservoir connectivity properties, and the difference between the original pressure and the saturation pressure.

[0042] In an exemplary embodiment, the process of determining the fault development characteristic score of an undeveloped fault-block oil reservoir is: determining the fault development characteristics of the undeveloped fault-block oil reservoir; and determining the fault development characteristic score of the undeveloped fault-block oil reservoir according to a scoring standard for the fault development characteristics.

[0043] In an exemplary embodiment, the process of determining the natural water multiple score of an undeveloped fault-block reservoir is as follows:

[0044] According to the determined fault development characteristic scores of the undeveloped fault-block oil reservoirs, a plurality of developed oil reservoirs with similar scores are determined;

[0045] Determine the average value of the natural energy water body multiple scores of multiple developed oil reservoirs, and use the average value as the corresponding score of the undeveloped fault block oil reservoir. Since the evaluation of the natural energy water body multiple requires production dynamic data such as test production, if the undeveloped fault block oil reservoir lacks dynamic data such as test production and cannot directly evaluate the natural water body multiple, the developed oil reservoir with a similar score can be found in the database based on the block development characteristics of the undeveloped fault block oil reservoir, and the average value of the natural energy water body multiple is taken as the corresponding score of the undeveloped fault block oil reservoir for calculation.

[0046] In an exemplary embodiment, the process of determining the reservoir connectivity physical property score of an undeveloped fault-block reservoir is as follows:

[0047] The reservoir connectivity physical property score of undeveloped fault block reservoirs is determined by the permeability scoring standard obtained through logging interpretation.

[0048] In an exemplary embodiment, the process of determining the score of the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoir is:

[0049] The original pressure and saturation pressure of undeveloped fault block reservoirs are obtained through high pressure testing;

[0050] Calculate the difference between the original pressure and the saturation pressure;

[0051] The score of the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoir is determined according to the scoring standard of the difference between the original pressure and the saturation pressure.

[0052] In an exemplary embodiment, the scoring criteria for the difference between the original pressure and the saturation pressure are:

[0053] The difference between the original pressure and the saturated pressure is 0-5 MPa, corresponding to the score range of 0-25;

[0054] The difference between the original pressure and the saturation pressure is 5-10 MPa, corresponding to the score range of 25-50;

[0055] The difference between the original pressure and the saturation pressure is 10-15 MPa, corresponding to the score range of 50-75;

[0056] The difference between the original pressure and the saturation pressure is greater than 15 MPa, corresponding to a score range of 75 to 100.

[0057] In an exemplary embodiment, the natural energy comprehensive factor value of the undeveloped fault block reservoir is determined by a weighted method, including:

[0058] The natural energy of developed fault-block reservoirs is determined by multivariate regression analysis, and the correlation coefficients with fault development characteristics, reservoir connectivity and reservoir physical properties, and the difference between the original pressure and saturation pressure are determined;

[0059] The natural energy comprehensive factor value of undeveloped fault-block reservoirs is obtained by using the linear weighted method and combining the determined correlation coefficient.

[0060] The natural energy comprehensive factor value is:

[0061]

[0062] In the formula, C i represents the comprehensive factor value of natural energy of an undeveloped fault block reservoir i, d ij is the index score of evaluation index j of an undeveloped fault block reservoir i, e j It is the index weight correlation coefficient of the evaluation index determined based on the wells that have been drilled.

[0063] In an exemplary embodiment, the process of the index weight correlation coefficient of the evaluation index j determined by drilling is: through the natural energy of each developed fault block reservoir, multiple regression analysis is performed with parameters such as fault development characteristics, reservoir connectivity and reservoir physical properties, and the difference between original pressure and saturation pressure, and the correlation between each parameter and natural energy is analyzed. The results show that the correlation of the parameters affecting the strength of the natural energy of the fault block reservoir is from high to low, namely, fault development characteristics, natural water body multiples, reservoir connectivity physical properties, and the difference between original pressure and saturation pressure, with correlation coefficients of 0.45, 0.41, 0.11, and 0.03, respectively.

[0064] In an exemplary embodiment, the natural energy of the undeveloped fault block reservoir is determined according to the natural energy comprehensive factor value. According to the natural energy comprehensive factor value of the undeveloped fault block reservoir to be evaluated, the order can be sorted. For those with a natural energy comprehensive factor value below 25, combined with the size of geological reserves, the feasibility of water injection or gas injection to supplement energy can be further demonstrated for those with large geological reserves.

[0065] In this embodiment, a natural energy influencing parameter system of undeveloped fault block oil reservoirs is established, the parameters influencing natural energy are classified, and the parameters influencing natural energy are ranked in terms of sensitivity using a combination of actual dynamic and static data regression analysis, thereby clarifying the main controlling factors influencing the natural energy of fault block oil reservoirs. At the same time, combined with expert scoring, analogy analysis, graded assignment and other methods, the research methods of fault sealing, reservoir configuration anatomy, well test and production test data analysis, dimensionless water body multiple estimation and other research methods are integrated to determine the weights of the influencing parameters and the specific value of each influencing parameter of the undeveloped fault block oil reservoir to be evaluated. Using the linear weighted method, the natural energy comprehensive factor value of each undeveloped fault block oil reservoir to be evaluated is obtained, thereby achieving a relatively reasonable evaluation of the natural energy of the undeveloped fault block oil reservoir.

[0066] An embodiment of the present invention also provides a device for predicting the natural energy of undeveloped fault-block oil reservoirs, the device comprising: a memory 200 and a processor 210; the memory is used to store a program for establishing and predicting the natural energy of undeveloped fault-block oil reservoirs, and the processor is used to read and execute the program for predicting the natural energy of undeveloped fault-block oil reservoirs, and execute any one of the methods described in the above embodiments.

[0067] An embodiment of the present invention further provides a computer-readable storage medium having a data processing program stored thereon, and the data processing program is executed by a processor to perform the method for predicting natural energy of undeveloped fault block reservoirs described in any one of the above embodiments.

[0068] Example 1

[0069] Based on the relevant data of developed fault-block reservoirs in the study area, the process of determining the natural energy of M and N in undeveloped fault-block reservoirs is as follows:

[0070] Step 1. Based on the actual dynamic data of multiple fault-block reservoirs that have been developed in the database, the natural water body multiples of each fault-block reservoir are calculated.

[0071] Step 2. Analyze the fault development characteristics, reservoir connectivity properties, and the difference between the original pressure and saturation pressure of each developed fault-block reservoir.

[0072] Step 3. Assign values ​​to the fault development characteristics, reservoir configuration, original pressure and saturation pressure difference of the developed fault-block reservoir according to the corresponding scoring criteria.

[0073] Step 4. Calculate the natural energy of the developed fault-block reservoir.

[0074] Step 5. Perform a multivariate regression analysis on the natural energy of each developed fault block reservoir and parameters such as fault development characteristics, reservoir connectivity properties, and original pressure saturation pressure difference to analyze the correlation between each parameter and natural energy. For example, the correlation coefficients are 0.45, 0.41, 0.11, and 0.03, respectively.

[0075] Step 6. Determine the fault development characteristics, natural water body multiples, reservoir connectivity properties, and the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoirs M and N, as shown in Table 1.

[0076] Step 61. The process of determining the fault development characteristic score of the undeveloped fault-block reservoir is as follows:

[0077] Determine the fault block development characteristics of undeveloped fault block reservoirs;

[0078] The fault development characteristic score of the undeveloped fault-block reservoir is determined according to the scoring standard of fault-block development characteristics.

[0079] Step 62. The process of determining the natural water body multiple score of the undeveloped fault block reservoir is:

[0080] According to the determined fault development characteristic scores of the undeveloped fault-block oil reservoirs, a plurality of developed oil reservoirs with similar scores are determined;

[0081] Determine the average of the natural energy water multiple scores of multiple developed reservoirs and use the average as the corresponding score for the undeveloped fault block reservoir.

[0082] Step 63. The process of determining the natural energy water body multiple is:

[0083] The natural water influx coefficient and natural water influx volume of each developed fault-block reservoir are calculated using hydrodynamic methods;

[0084] Calculate the volume of the natural water body according to the natural water intrusion coefficient and the natural water intrusion amount;

[0085] The volume of the natural water body is ratioed to the volume of the oil reservoir to determine the natural water body multiple.

[0086] Step 64. The process of determining the reservoir connectivity physical property score of the undeveloped fault-block reservoir is:

[0087] The reservoir connectivity physical property score of undeveloped fault block reservoirs is determined by the permeability scoring standard obtained through logging interpretation.

[0088] Step 65. The process of determining the score of the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoir is:

[0089] The original pressure and saturation pressure of undeveloped fault block reservoirs are obtained through high pressure testing;

[0090] Calculate the difference between the original pressure and the saturation pressure;

[0091] The score of the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoir is determined according to the scoring standard of the difference between the original pressure and the saturation pressure.

[0092] Table 1 Evaluation index scores of undeveloped fault block reservoirs

[0093]

[0094] Step 7. Based on the natural energy of the developed fault block reservoir determined in step 5, the correlation coefficient between fault development characteristics, reservoir connectivity and reservoir physical properties, and the difference between the original pressure and saturation pressure is calculated; using the linear weighted method, the comprehensive factor value of the natural energy of each undeveloped fault block reservoir to be evaluated is obtained.

[0095] The comprehensive natural energy factor value of M = 0.45*74+0.41*52+0.11*80+0.03*70=65.52.

[0096] The comprehensive natural energy factor value of N = 0.45*15+0.41*17+0.11*60+0.03*70=22.42.

[0097] Step 8. According to the value of the natural energy comprehensive factor of the undeveloped fault block reservoir to be evaluated, it can be seen that the natural energy of the M reservoir is significantly stronger than that of the N reservoir. The M reservoir does not require water injection or gas injection, and the natural energy comprehensive factor value of the N reservoir is below 25. If the geological reserves are large, the feasibility of water injection or gas injection to supplement energy can be further demonstrated.

[0098] The method for predicting the natural energy of undeveloped fault block reservoirs in this embodiment has the following technical effects:

[0099] 1. This application clarifies the main controlling factors affecting the natural energy of fault-block reservoirs and the ranking of their sensitivity;

[0100] 2. Based on the characteristics and development features of developed fault block reservoirs, this application sorts out the factors that affect the development of fault block reservoirs, determines the indicators that affect the evaluation of natural energy, and combines scoring standards, graded assignment, and multivariate regression methods to obtain a relatively reasonable assessment of the natural energy of undeveloped fault block reservoirs.

[0101] 3. This application enables a reasonable understanding of the natural energy strength of undeveloped fault block reservoirs before production, and can formulate more reasonable development plans and achieve better development results.

[0102] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A method for predicting the natural energy of undeveloped fault block reservoirs, characterized in that: The method comprises: According to the relevant geological information of the undeveloped fault-block reservoir, the fault development characteristics, natural water body multiples, reservoir connectivity properties, and the scores of the difference between the original pressure and the saturation pressure of the undeveloped fault-block reservoir are determined respectively; Determining the natural energy comprehensive factor value of the undeveloped fault block reservoir by using a weighted method; The natural energy of the undeveloped fault block reservoir is determined according to the natural energy comprehensive factor value.

2. The method for predicting natural energy of undeveloped fault-block reservoirs according to claim 1, characterized in that: The process of determining the fault development characteristic score of an undeveloped fault-block reservoir is as follows: Determining fault block development characteristics based on relevant geological information of the undeveloped fault block reservoir; The fault development characteristic score of the undeveloped fault block reservoir is determined according to the predetermined scoring criteria.

3. The method for predicting natural energy of undeveloped fault-block reservoirs according to claim 2, characterized in that: The process for determining the natural water multiple score for undeveloped fault-block reservoirs is: According to the fault development characteristic score of the undeveloped fault-block oil reservoir, determining a plurality of developed oil reservoirs with similar scores; An average value is obtained according to the natural water body multiple scores of a plurality of developed oil reservoirs, and the average value is used as the natural water body multiple of the undeveloped fault block oil reservoir; The natural water body multiple score of the undeveloped fault block reservoir is determined according to a predetermined scoring standard.

4. The method for predicting natural energy of undeveloped fault-block reservoirs according to claim 3, characterized in that: The process of determining the natural water body multiple of the developed oil reservoir is as follows: The natural water influx coefficient and natural water influx volume of developed fault-block reservoirs are calculated by hydrodynamic method. Calculate the volume of the natural water body according to the natural water intrusion coefficient and the natural water intrusion amount; The volume of the natural water body is ratioed to the volume of the oil reservoir to determine the natural water body multiple.

5. The method for predicting natural energy of undeveloped fault-block reservoirs according to claim 2, characterized in that: The process for determining the reservoir connectivity physical property score for undeveloped fault-block reservoirs is: Determine the value of reservoir permeability for undeveloped fault-block reservoirs; The reservoir connectivity physical property score of the undeveloped fault block reservoir is determined according to the permeability value and the corresponding scoring standard; in fact, the reservoir permeability is used to characterize the reservoir connectivity physical property.

6. The method for predicting natural energy of undeveloped fault-block reservoirs according to claim 2, characterized in that: The process of determining the difference between the initial pressure and the saturation pressure of an undeveloped fault block reservoir is: The original pressure and saturation pressure of undeveloped fault block reservoirs are obtained through high pressure testing; Calculate the difference between the original pressure and the saturated pressure to obtain the difference between the original pressure and the saturated pressure; The score of the difference between the original pressure and the saturation pressure of the undeveloped fault block reservoir is determined according to a predetermined scoring standard.

7. The method for predicting natural energy of undeveloped fault-block reservoirs according to claim 6, characterized in that: The method of using a weighted method to determine the natural energy comprehensive factor value of the undeveloped fault block reservoir includes: The correlation coefficients between fault development characteristics, natural water body multiples, reservoir connectivity properties, the difference between original pressure and saturation pressure and natural energy of developed fault-block reservoirs were determined by multivariate regression analysis. The natural energy comprehensive factor value of the undeveloped fault block reservoir is determined by using the linear weighting method based on the determined correlation coefficient.

8. The method for predicting the natural energy of undeveloped fault-block reservoirs according to claim 7, The natural energy comprehensive factor value is: In the formula, C i represents the comprehensive factor value of natural energy of an undeveloped fault block reservoir i, d ij is the index score of evaluation index j of an undeveloped fault block reservoir i, e j It is the index weight correlation coefficient of the evaluation index j determined based on the wells that have been drilled.

9. A device for predicting the natural energy of undeveloped fault block reservoirs, characterized in that: The device comprises: a memory and a processor; the memory is used to store a program for establishing and predicting the natural energy of undeveloped fault block reservoirs, and the processor is used to read and execute the program for predicting the natural energy of undeveloped fault block reservoirs, and execute the method described in any one of claims 1-8.

10. A computer-readable storage medium having a data processing program stored thereon, wherein the data processing program is executed by a processor to implement the method for predicting natural energy of undeveloped fault-block reservoirs according to any one of claims 1 to 8.

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