Oil and gas field economic yield determination method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides an oil and gas field economic yield determination method and device, electronic equipment and a storage medium. The method comprises the steps that an economic evaluation model is constructed based on finance and tax systems and contract terms of a resource country where an oil and gas field is located; according to the economic evaluation model, predicting a quasi-economic limit yield curve in a combined period; predicting an oil and gas field yield curve in a combination period; and determining the economic yield of the oil and gas field according to the quasi-economic limit yield curve and the yield curve of the oil and gas field. The method for determining the economic yield of the oil and gas field is easy to practice, and the economic yield of the oil and gas field under different overseas taxes can be conveniently and effectively determined.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas field development, and in particular to a method, device, electronic device and storage medium for determining the economic output of an oil and gas field. Background Art

[0002] As oil and gas exploitation proceeds, affected by the law of non-renewable resources, the remaining recoverable reserves gradually decrease, and the difficulty of exploration and development increases day by day; at the same time, when the oil field is developed to a certain stage, there is an objective law of decreasing production. Therefore, the exploitation of oil and gas resources must be carried out in the most effective and economical way, and the maximum exploitation and utilization of resources must be achieved.

[0003] The study of domestic economic production began in the 1990s. Up to now, the relevant research content mainly involves the judgment method of economic and non-economic production in the later stage of development, the calculation method of the economic production scale of a single well, and the difference in the connotation of economic production in different development stages. At present, there is no unified oil and gas reserve evaluation standard in the world, and each country has its own standards. Among them, the Petroleum Resource Management System (SPE-PRMS) standards and the US Securities and Exchange Commission (SEC) standards are the most widely used industry evaluation standards. No matter which standard, there are economic and commercial requirements for reserves. Regarding the economic nature of reserves, the Society of Petroleum Engineers (SPE) specifies the use of the discounted cash flow method, that is, the economic limit year is used as the boundary to calculate the reserve value during the period.

[0004] So far, there are abundant research results in China on the algorithm of oil field economic output, but it is not enough for international oil contracts. This is mainly because international cooperation projects often have diversified oil contracts, complex fiscal and taxation of resource-rich countries, different contract expiration dates, uneven exploration and development conditions, and different operating costs. At the same time, the approval of exploration and development plans, operating measures, and investment plans are restricted by the governments of resource-rich countries and partners. Domestic fiscal and taxation usually adopts a fixed tax rate, while the taxes and tax rates under different contract models in different resource-rich countries overseas are different, and they are linked to oil prices, production and yields, and even slide according to different proportions based on two factors or adopt a profit sharing method.

[0005] Usually, a set of technical solutions is simulated by reservoir developers, and then handed over to technical and economic evaluation personnel to prepare a model to calculate the economic feasibility of the solution based on the contract finance and tax applicable to the oilfield assets. After judging whether it meets the economic standards, it is returned to the technical personnel for technical adjustment. In this way, multiple rounds of measurement and evaluation are repeated until the constraints of all parties are met and the requirements are met. For example, an oilfield with 10 wells needs to be repeatedly measured hundreds to thousands of times to calculate the economic limit year and corresponding economic output of the oilfield; at the same time, the interactive conversion of different professional technicians in the middle takes longer. In the evaluation of new projects, it is impossible to provide scientific and strong support for fleeting investment opportunities.

[0006] It should be pointed out that the information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0007] In view of this, the present application provides a method, device, electronic device and storage medium for determining the economic output of an oil and gas field, so as to solve the problem that the process of determining the economic output of an oil and gas field in the prior art is time-consuming.

[0008] In a first aspect, an embodiment of the present application provides a method for determining the economic output of an oil and gas field, comprising:

[0009] Construct an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil and gas fields are located;

[0010] Predicting the quasi-economic limit production curve during the contract period according to the economic evaluation model;

[0011] Predict the oil and gas field production curve during the contract period;

[0012] The economic output of the oil and gas field is determined according to the quasi-economic limit output curve and the oil and gas field output curve.

[0013] In a possible implementation, the economic evaluation model is constructed based on the fiscal and taxation system and contract terms of the resource country where the oil and gas field is located, including:

[0014] An economic evaluation model is constructed based on the discounted cash flow method and the tax payment method and tax terms in the tax contract of the resource country where the oil field is located.

[0015] In a possible implementation, the economic evaluation model is:

[0016]

[0017] Among them, NCF OPis the net cash flow from operations, P is the sales price, Q is the annual quasi-economic limit output, θ is the commodity rate, C D It is the direct cost, and GovTake is the government income, including various taxes collected by the government and profit sharing.

[0018] In a possible implementation, predicting the quasi-economic limit yield curve during the contract period according to the economic evaluation model includes:

[0019] According to the formula: P×Q×θ=C D +GovTake calculates the annual quasi-economic limit output Q for each year during the contract period;

[0020] The quasi-economic limit production curve is determined based on the annual quasi-economic limit production Q for each year during the contract period.

[0021] In one possible implementation, C D =C F +C VO ×Q+C VL ×Q÷(1-f W )

[0022] Among them, C F is the fixed cost, C VO is the cost of a barrel of oil, C VL is the barrel liquid cost, f W is the moisture content.

[0023] In one possible implementation, under the mining tax contract, GovTake = T = R T (Q, P, ROR) × Q × P × θ;

[0024] Under a production-sharing contract, GovTake = T + Gov profit O&G (Q, P, ROR);

[0025] Among them, T is the various taxes paid to the government, R T is the tax rate, and Gov profit O&G (Q, P, ROR) is the government’s share of the profit from oil and gas.

[0026] In a possible implementation, the predicted oil and gas field production curve during the contract period includes:

[0027] If detailed information is lacking, the oil and gas field production curve during the contract period is predicted based on the analogy method;

[0028] If the reservoir formation, fluid parameters and production data are sufficient, the oil and gas field production curve during the contract period will be predicted using reservoir numerical simulation and material balance methods;

[0029] If the oil and gas field has been generated for a period of time and has a declining pattern, the production decline method is used to predict the oil and gas field production curve during the contract period.

[0030] In a possible implementation, the production decline method includes an exponential decline method, a hyperbolic decline method and / or a harmonic decline method.

[0031] In one possible implementation,

[0032] The expression of the exponential decrease method is:

[0033]

[0034] The expression of the harmonic reduction method is:

[0035]

[0036] The expression of the hyperbolic reduction method is:

[0037]

[0038] Among them, q is the output, q i is the initial output, D is the decline rate, t is the time, t i is the initial time, D i is the initial decline rate, and n is the decline exponent.

[0039] In a possible implementation, determining the economic output of the oil and gas field according to the quasi-economic limit output curve and the oil and gas field output curve includes:

[0040] Determining a quasi-economic limit year according to the intersection of the quasi-economic limit production curve and the oil and gas field production curve;

[0041] Calculate the critical year of economic benefits of the oil and gas fields in the future based on the production curve of the oil and gas fields during the contract period and the oil and gas prices and costs predicted based on the operating conditions;

[0042] If the quasi-economic limit year matches the critical year for economic benefits, the quasi-economic limit year is determined to be the economic limit year;

[0043] Based on the economic limit year, the economic output of the oil and gas field is determined.

[0044] In a possible implementation, the calculation formula for the economic output of the oil and gas field is:

[0045]

[0046] Among them, Q ec is the economic output of the oil and gas field, q t is the output in year t, and m is the economic limit year.

[0047] In a second aspect, an embodiment of the present application provides a device for determining economic production of an oil and gas field, comprising:

[0048] The economic evaluation model building module is used to build an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil and gas field is located;

[0049] A quasi-economic limit yield curve prediction module, used to predict the quasi-economic limit yield curve within the contract period according to the economic evaluation model;

[0050] Oil and gas field production curve prediction module, used to predict the oil and gas field production curve within the contract period;

[0051] The oil and gas field economic production determination module is used to determine the economic production of the oil and gas field according to the quasi-economic limit production curve and the oil and gas field production curve.

[0052] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0053] processor;

[0054] Memory;

[0055] And a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, and when the instructions are executed by the processor, the electronic device executes any one of the methods described in the first aspect.

[0056] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described in the first aspect.

[0057] The method for determining the economic output of oil and gas fields provided in the embodiment of the present application is easy to practice and can conveniently and effectively realize the determination of the economic output of oil and gas fields under different overseas tax systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0059] Figure 1 A schematic diagram of a flow chart of a method for determining the economic output of an oil and gas field provided in an embodiment of the present application;

[0060] Figure 2A simulated cross-sectional diagram of the economic output of the E oil field under a production sharing contract in a certain African country provided in the embodiment of the present application;

[0061] Figure 3 This application also provides a structural block diagram of a device for determining the economic output of an oil and gas field;

[0062] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0064] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0065] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0066] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0067] See also Figure 1 , is a flow chart of a method for determining the economic output of an oil and gas field provided in an embodiment of the present application. Figure 1 As shown, it mainly includes the following steps.

[0068] Step S101: construct an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil and gas field is located.

[0069] In specific implementation, an economic evaluation model can be constructed based on the discounted cash flow method combined with the tax payment method and tax clauses in the tax contract of the resource country where the oil and gas field is located. Among them, taxes include mining taxes, production taxes, export tariffs, property taxes, and excess profit taxes, etc.; tax clauses include profit sharing, etc.

[0070] In a possible implementation, the economic evaluation model is shown in Formula 1.

[0071] Formula 1:

[0072]

[0073] Among them, NCF OP is the net cash flow from operations, P is the sales price, Q is the annual quasi-economic limit output, θ is the commodity rate, C D It is the direct cost, and GovTake is the government income, including various taxes collected by the government and profit sharing.

[0074] Step S102: predicting the quasi-economic limit output curve during the contract period according to the economic evaluation model.

[0075] In specific implementation, the annual quasi-economic limit output Q for each year during the contract period can be calculated first according to Formula 2, and then the quasi-economic limit output curve can be determined based on the annual quasi-economic limit output Q for each year during the contract period.

[0076] Formula 2:

[0077] P×Q×θ=C D +GovTake

[0078] In one possible implementation, the direct costs in overseas oil and gas field development include: materials, fuel, power, injection fees for oil displacement materials, oil and gas processing fees, transportation fees, wages and benefits for production workers, well repair operation fees, oil and gas field management fees and other direct costs. The first six costs are related to production and are variable costs. The last four costs have no direct relationship with oil production and generally do not change with increases or decreases in production, or change very little, and are fixed costs. Among them, variable costs such as power and fuel are related to liquid production, while transportation costs are related to oil production. Therefore, direct costs C D It can be determined using the following formula 3.

[0079] Formula 3:

[0080] C D =C F +C VO ×Q+C VL ×Q÷(1-f W )

[0081] Among them, C F is the fixed cost, C VO is the cost of a barrel of oil, C VL is the barrel liquid cost, f W is the moisture content.

[0082] Under overseas mining tax contracts, taxes and tax rates vary in different resource countries, and are linked to oil prices, production and yield rates, and even slide at different proportions based on multiple factors. Therefore, mining taxes, production taxes, export tariffs, property taxes, excess profit taxes and other taxes can be determined using the following formula 4, which can be applied to the calculation of oil and gas fields or single wells under mining tax contracts.

[0083] Formula 4:

[0084] GovTake=T=R T (Q, P, ROR) × Q × P × θ

[0085] Under the product-sharing contract, in addition to taxes such as mining taxes, the government also uses product sharing to obtain profits. Therefore, the tax rate can be expressed as a function of output and price or rate of return. Therefore, taxes such as mining taxes, production taxes, export tariffs, and the government's share of profits can be determined by the following formula 5. This method can be applied to the calculation of oil and gas fields under the product-sharing contract.

[0086] Formula 5:

[0087] GovTake=T+Gov profit O&G(Q,P,ROR)

[0088] Among them, T is the various taxes paid to the government, R T is the tax rate, and Gov profit O&G (Q, P, ROR) is the government’s share of the profit from oil and gas.

[0089] Furthermore, by substituting Formula 4 or Formula 5 into Formula 2, Formula 6 can be obtained.

[0090] Formula 6:

[0091] P×Q×θ=C F +C VO ×Q+C VL ÷(1-f W )+GovTake

[0092] According to Formula 6, the annual quasi-economic limit output Q value can be solved, and the quasi-economic limit output during the contract period can be simulated year by year to determine the quasi-economic limit output curve.

[0093] Step S103: predicting the oil and gas field production curve during the contract period.

[0094] In one possible implementation, if detailed information is lacking, the oil and gas field production curve during the contract period is predicted based on the analogy method; if the reservoir formation, fluid parameters, and production data are sufficient, the oil and gas field production curve during the contract period is predicted using reservoir numerical simulation and material balance methods; if the oil and gas field has been generated for a period of time and has a declining pattern, the production decline method is used to predict the oil and gas field production curve during the contract period.

[0095] In a possible implementation, the production decline method includes an exponential decline method, a hyperbolic decline method and / or a harmonic decline method.

[0096] Specifically, the exponential decreasing law is shown in Formula 7.

[0097] Formula 7:

[0098]

[0099] The harmonic decreasing law is shown in Formula 8.

[0100] Formula 8:

[0101]

[0102] The hyperbolic decreasing law is shown in Formula 9.

[0103] Formula 9:

[0104]

[0105] Among them, q is the output, q i is the initial output, D is the decline rate, t is the time, t i is the initial time, D i is the initial decline rate, and n is the decline exponent.

[0106] Step S104: Determine the economic output of the oil and gas field according to the quasi-economic limit output curve and the oil and gas field output curve.

[0107] Specifically, the quasi-economic limit production curve and the oil and gas field production curve obtained in step S102 and step S103 are projected into a coordinate system to find the intersection point, which is the quasi-economic limit year.

[0108] Furthermore, based on the oil and gas field production curve during the contract period, as well as the oil and gas prices and costs predicted based on the operating conditions, the critical year for the economic benefits of the oil and gas fields in the future is calculated. The specific description is as follows:

[0109] The objective function is shown in Formula 10.

[0110] Formula 10:

[0111]

[0112] The constraints are shown in Formula 11.

[0113] Formula 11:

[0114] NCF OP =P×q×θ-GovTake-C D

[0115] Where t is the tth year, n is the production year of the oil and gas field, and NCF OP is the net cash flow from operations, GovTake is the tax or government profit share, etc., C D For direct costs.

[0116] Furthermore, if the quasi-economic limit year matches the critical year for economic benefits, the quasi-economic limit year is determined to be the economic limit year; if the quasi-economic limit year does not match the critical year for economic benefits, steps S103 and S104 are re-executed until the quasi-economic limit year matches the critical year for economic benefits.

[0117] Furthermore, after the economic limit year is determined, the economic output of the oil and gas field is determined based on the economic limit year.

[0118] In the specific implementation, the calculation formula for the economic output of oil and gas fields is shown in Formula 12.

[0119] Formula 12:

[0120]

[0121] Among them, Q ec is the economic output of the oil and gas field, q t is the output in year t, and m is the economic limit year.

[0122] The annual quasi-economic limit output calculation formula determined in the embodiment of the present application can be divided into different contract models and tax systems to simulate the quasi-economic limit output during the contract period year by year, solving the difficulties in simulation and calculation caused by complex overseas finance and taxation. At the same time, the method for determining the quasi-economic limit year (the method of projecting the quasi-economic limit output and the predicted output curve into a coordinate system to find the intersection point) proposed reduces the intermediate links of interaction between different professionals in the process, and significantly improves the calculation efficiency. This application provides a practical method and means for determining the economic scale of oil and gas fields under complex overseas finance and taxation, which takes into account efficiency and accuracy and is easy to operate in practice.

[0123] For ease of understanding, the technical solution provided in the embodiment of the present application is exemplarily described below in conjunction with a specific application scenario.

[0124] See also Figure 2, is a simulated cross-sectional diagram of the economic output of the E oil field under a production sharing contract of a certain African country provided in an embodiment of the present application. In this embodiment, a method for determining the economic output of the E oil field under a production sharing contract of a certain African country may include the following steps.

[0125] The first step is to build an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil field is located. This example is for the E oil field under a product sharing contract in a resource country in Africa. The cash flow model is compiled based on the cost recovery and product sharing terms in the fiscal and taxation. Economic evaluation parameters such as oil prices and commodity rates are predicted and input into the economic evaluation model.

[0126] The second step is to predict the direct cost of the oil field according to the actual situation of the oil field, and based on the break-even principle, apply the simulation analysis function in Excel to simulate the quasi-economic limit output during the contract period year by year to form a quasi-economic limit output curve, such as Figure 2 As shown in the figure, due to the optimization of operation mode, iterative calculations are required 2-11 times each year, and a total of 89 iterations are required from 2021 to 2040.

[0127] The third step is to use the production decline method to predict the oil field production curve according to the decline law of the oil field, such as Figure 2 shown.

[0128] The fourth step is Figure 2 As shown in the figure, the two curves predicted in the second and third steps are projected into a coordinate system, and the intersection point is found in 2034, which is the quasi-economic limit year. Further, the predicted output is input into the first step economic evaluation model to obtain the net operating cash flow, as shown in Figure 1 The yellow curve in the middle. At the same time, it is found that the year when the curve turns negative is 2034, which is the same year as the quasi-economic limit year. Therefore, it is determined that under the current assumptions, the predicted output from 2021 to 2034 is the economic output of the E oil field.

[0129] Corresponding to the above-mentioned embodiments, the present application also provides a device for determining the economic output of an oil and gas field.

[0130] See also Figure 3 , which is a structural block diagram of a device for determining the economic output of an oil and gas field provided in this application. Figure 3 As shown, it mainly includes the following modules.

[0131] An economic evaluation model building module 301 is used to build an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil and gas field is located;

[0132] A quasi-economic limit production curve prediction module 302 is used to predict the quasi-economic limit production curve within the contract period according to the economic evaluation model;

[0133] The oil and gas field production curve prediction module 303 is used to predict the oil and gas field production curve during the contract period;

[0134] The oil and gas field economic production determination module 304 is used to determine the economic production of the oil and gas field according to the quasi-economic limit production curve and the oil and gas field production curve.

[0135] It should be pointed out that the specific contents involved in the embodiments of the present application can be found in the description of the above method embodiments, and for the sake of brevity, they will not be repeated here.

[0136] Corresponding to the above embodiment, an embodiment of the present application further provides an electronic device.

[0137] See also Figure 4 , is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 4 As shown, the electronic device 400 may include: a processor 401, a memory 402 and a communication unit 403. These components communicate via one or more buses. Those skilled in the art will appreciate that the electronic device structure shown in the figure does not limit the embodiments of the present application, and it may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange components differently.

[0138] The communication unit 403 is used to establish a communication channel so that the electronic device can communicate with other devices.

[0139] The processor 401 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. It runs or executes software programs and / or modules stored in the memory 402, and calls data stored in the memory to perform various functions of the electronic device and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 401 can include only a central processing unit (CPU). In the embodiment of the present application, the CPU can be a single computing core or multiple computing cores.

[0140] Memory 402 is used to store execution instructions of processor 401. Memory 402 can be implemented by any type of volatile or non-volatile storage device or a combination of them, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0141] When the execution instructions in the memory 402 are executed by the processor 401 , the electronic device 400 is enabled to execute part or all of the steps in the above method embodiment.

[0142] Corresponding to the above embodiment, the embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein when the program is running, the device where the computer-readable storage medium is located may be controlled to perform some or all of the steps in the above method embodiment. In a specific implementation, the computer-readable storage medium may be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0143] Corresponding to the above-mentioned embodiment, the embodiment of the present application further provides a computer program product, which includes executable instructions. When the executable instructions are executed on a computer, the computer executes some or all of the steps in the above-mentioned method embodiment.

[0144] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0145] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0146] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0147] In several embodiments provided in the present application, any function can be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., and other media that can store program codes.

[0148] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining the economic output of an oil and gas field, characterized in that: include: Construct an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil and gas fields are located; Predicting the quasi-economic limit production curve during the contract period according to the economic evaluation model; Predict the oil and gas field production curve during the contract period; The economic output of the oil and gas field is determined according to the quasi-economic limit output curve and the oil and gas field output curve.

2. The method according to claim 1, characterized in that The economic evaluation model is constructed based on the fiscal and taxation system and contract terms of the resource country where the oil and gas field is located, including: An economic evaluation model is constructed based on the discounted cash flow method and the tax payment method and tax terms in the tax contract of the resource country where the oil field is located.

3. The method according to claim 2, characterized in that The economic evaluation model is: Among them, NCF OP is the net cash flow from operations, P is the sales price, Q is the annual quasi-economic limit output, θ is the commodity rate, C D It is the direct cost, and GovTake is the government income, including various taxes collected by the government and profit sharing.

4. The method according to claim 3, characterized in that The method of predicting the quasi-economic limit yield curve during the contract period according to the economic evaluation model includes: According to the formula: P×Q×θ=C D +GovTake calculates the annual quasi-economic limit output Q for each year during the contract period; The quasi-economic limit production curve is determined based on the annual quasi-economic limit production Q for each year during the contract period.

5. The method according to claim 4, characterized in that C D =C F +C VO ×Q+C VL ×Q÷(1-f W ) Among them, C F is the fixed cost, C VO is the cost of a barrel of oil, C VL is the barrel liquid cost, f W is the moisture content.

6. The method according to claim 4, characterized in that Under the mining tax contract, GovTake=T=R T (Q, P, ROR) × Q × P × θ; Under a production sharing contract, GovTake = T + Gov profitO&G (Q, P, ROR); Among them, T is the various taxes paid to the government, R T is the tax rate, Gov profitO&G (Q, P, ROR) is the government’s share of the profit from oil and gas.

7. The method according to claim 1, characterized in that The forecasted oil and gas field production curve during the contract period includes: If detailed information is lacking, the oil and gas field production curve during the contract period is predicted based on the analogy method; If the reservoir formation, fluid parameters and production data are sufficient, the oil and gas field production curve during the contract period will be predicted using reservoir numerical simulation and material balance methods; If the oil and gas field has been generated for a period of time and has a declining pattern, the production decline method is used to predict the oil and gas field production curve during the contract period.

8. The method according to claim 7, characterized in that The production decline method includes an exponential decline method, a hyperbolic decline method and / or a harmonic decline method.

9. The method according to claim 8, characterized in that The expression of the exponential decrease method is: The expression of the harmonic reduction method is: The expression of the hyperbolic reduction method is: Among them, q is the output, q i is the initial output, D is the decline rate, t is the time, t i is the initial time, D i is the initial decline rate, and n is the decline exponent.

10. The method according to claim 1, characterized in that Determining the economic output of the oil and gas field according to the quasi-economic limit output curve and the oil and gas field output curve includes: Determining a quasi-economic limit year according to the intersection of the quasi-economic limit production curve and the oil and gas field production curve; Calculate the critical year of economic benefits of the oil and gas fields in the future based on the production curve of the oil and gas fields during the contract period and the oil and gas prices and costs predicted based on the operating conditions; If the quasi-economic limit year matches the critical year for economic benefits, the quasi-economic limit year is determined to be the economic limit year; Based on the economic limit year, the economic output of the oil and gas field is determined.

11. The method according to claim 10, characterized in that The calculation formula for the economic output of the oil and gas field is: Among them, Q ec is the economic output of the oil and gas field, q t is the output in year t, and m is the economic limit year.

12. A device for determining the economic output of an oil and gas field, characterized in that: include: The economic evaluation model building module is used to build an economic evaluation model based on the fiscal and taxation system and contract terms of the resource country where the oil and gas field is located; A quasi-economic limit yield curve prediction module, used to predict the quasi-economic limit yield curve within the contract period according to the economic evaluation model; Oil and gas field production curve prediction module, used to predict the oil and gas field production curve within the contract period; The oil and gas field economic production determination module is used to determine the economic production of the oil and gas field according to the quasi-economic limit production curve and the oil and gas field production curve.

13. An electronic device, characterized in that: include: processor; Memory; And a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, and when the instructions are executed by the processor, the electronic device executes the method according to any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 11.

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