Method and device for calculating the area of ​​ancient oil reservoirs in crude oil cracking gas reservoirs

Abstract

The invention discloses a method and device for calculating the area of ​​crude oil cracking gas reservoir and ancient oil reservoir, the method comprising: obtaining the formation temperature and formation pressure of the crude oil cracking gas reservoir and ancient oil reservoir; obtaining the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under ground standard conditions; calculating the volume coefficient of the crude oil in the crude oil cracking gas reservoir and ancient oil reservoir according to the buried depth of the crude oil cracking gas reservoir and ancient oil reservoir; calculating the cracking rate of the crude oil in the crude oil cracking gas reservoir and ancient oil reservoir; obtaining the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir; calculating the area of ​​the crude oil cracking gas reservoir and ancient oil reservoir according to the formation temperature, formation pressure, density of crude oil under ground standard conditions, volume coefficient of crude oil, cracking rate of crude oil, and deviation coefficient of original gas. The invention is simple to calculate, has high accuracy, and has strong practicality.

Description

Technical Field

[0001] The invention relates to the field of oil and gas dynamic reservoir geology, and in particular to a method and device for calculating the area of ​​crude oil cracking gas reservoir and ancient oil reservoir. Background Art

[0002] Oil and gas reservoir geology is the core of petroleum geology. It is a branch of petroleum geology that studies the formation and distribution of oil and gas reservoirs. Its research content includes static reservoir elements, dynamic reservoir processes, effects and final reservoir results, involving various aspects that affect the formation and distribution of oil and gas reservoirs, such as generation, transportation, accumulation and preservation. The area of ​​ancient oil reservoirs is a very important parameter in reservoir research. The determination of the area of ​​ancient oil reservoirs is of great significance to the study of the scale of ancient oil reservoirs, hydrocarbon generation potential and resource potential, and also plays an important guiding role in the evaluation of zones and the determination of favorable targets.

[0003] There are two main methods for determining the reservoir area of ​​ancient oil reservoirs in the prior art: one is to determine the ancient oil reservoir area based on the distribution area of ​​asphalt; the other is to determine the ancient oil reservoir area based on the area of ​​ancient closures. The shortcomings of determining the ancient oil reservoir area based on the distribution area of ​​asphalt are that drilling data is required, and it cannot be implemented in areas where drilling data is lacking. Second, it requires certain conditions to identify the area of ​​ancient crude oil based on the asphalt remaining in the current reservoir, because the structural morphology of the current gas field has changed significantly from the structural morphology of the ancient crude oil accumulation gas. Therefore, it is necessary to clarify whether the distribution of solid asphalt is affected by structural deformation, that is, whether crude oil cracking has been completed before structural deformation. Determine the area of ​​ancient oil reservoirs based on the area of ​​ancient closures. The area of ​​ancient closures is not necessarily the area of ​​ancient oil reservoirs, because the oil reservoir does not necessarily fill the entire closure, so the ancient closure represents the maximum ancient oil reservoir area, which may not be true. In summary, it is difficult to determine the reservoir area of ​​ancient oil reservoirs with prior art, and the accuracy is low. Summary of the invention

[0004] The embodiment of the present invention provides a method for calculating the area of ​​crude oil cracking gas reservoir and ancient oil reservoir, which is simple to calculate, has high accuracy and strong practicality. The method comprises:

[0005] Obtain formation temperature and formation pressure of crude oil cracking gas reservoir and ancient oil reservoir;

[0006] Obtain the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under standard ground conditions;

[0007] According to the burial depth of crude oil cracking gas reservoir and ancient oil reservoir, the volume coefficient of crude oil in crude oil cracking gas reservoir and ancient oil reservoir is calculated;

[0008] Calculate the cracking rate of crude oil in crude oil cracking gas reservoirs and ancient oil reservoirs;

[0009] Obtain the deviation coefficient of the original gas in the crude oil cracking gas reservoir;

[0010] The area of ​​the crude oil cracking gas reservoir and paleo-oil reservoir is calculated according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas.

[0011] The embodiment of the present invention also provides a crude oil cracking gas reservoir ancient oil reservoir area calculation device, which is simple to calculate, has high accuracy, and has strong practicality. The device includes:

[0012] The temperature and pressure acquisition module is used to obtain the formation temperature and formation pressure of crude oil cracking gas reservoir and ancient oil reservoir;

[0013] Density acquisition module, used to obtain the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under ground standard conditions;

[0014] The volume coefficient acquisition module is used to calculate the volume coefficient of crude oil in the crude oil cracking gas reservoir and the ancient oil reservoir according to the burial depth of the crude oil cracking gas reservoir and the ancient oil reservoir;

[0015] Cracking rate calculation module, used to calculate the cracking rate of crude oil in crude oil cracking gas reservoir and ancient oil reservoir;

[0016] The deviation coefficient acquisition module is used to obtain the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir;

[0017] The area calculation module is used to calculate the area of ​​the crude oil cracking gas reservoir and paleo-oil reservoir according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas.

[0018] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0019] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.

[0020] In the embodiment of the present invention, by obtaining the formation temperature and formation pressure of the crude oil cracking gas reservoir and ancient oil reservoir, obtaining the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under standard ground conditions, calculating the volume coefficient of the crude oil in the crude oil cracking gas reservoir and ancient oil reservoir according to the burial depth of the crude oil cracking gas reservoir and ancient oil reservoir, calculating the cracking rate of the crude oil in the crude oil cracking gas reservoir and ancient oil reservoir, and obtaining the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir, the area of ​​the crude oil cracking gas reservoir and ancient oil reservoir can be calculated according to the formation temperature, formation pressure, density of crude oil under standard ground conditions, volume coefficient of crude oil, cracking rate of crude oil, and deviation coefficient of original gas, the calculation is simple, the accuracy is high, and the method has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 Flow chart of a method for calculating the area of ​​a crude oil cracking gas reservoir and ancient oil reservoir in an embodiment of the present invention;

[0023] Figure 2 It is another flow chart of the method for calculating the area of ​​the crude oil cracking gas reservoir and the ancient oil reservoir in the embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the structure of a device for calculating the area of ​​a crude oil cracking gas reservoir and ancient oil reservoir in an embodiment of the present invention;

[0025] Figure 4 It is another flow chart of the method for calculating the area of ​​the crude oil cracking gas reservoir and the ancient oil reservoir in the embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0028] Figure 1 A flow chart of a method for calculating the area of ​​a crude oil cracking gas reservoir and ancient oil reservoir provided in an embodiment of the present invention is shown in FIG. Figure 1 As shown, the method includes:

[0029] Step 101: Obtain the formation temperature and formation pressure of the crude oil cracking gas reservoir and ancient oil reservoir.

[0030] In specific implementation, the formation temperature and formation pressure of the crude oil cracking gas reservoir and the ancient oil reservoir can be obtained according to the gas reservoir production test results or the reserve report.

[0031] Step 102: Obtain the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under standard ground conditions.

[0032] In the embodiment, since the cracking of the crude oil in the gas reservoir is completed, it is impossible to obtain the crude oil sample. According to the type of source rock in the gas reservoir, the crude oil generated by the same type of source rock is selected as the research object, and the density of the crude oil is measured under the standard ground conditions (293k, 0.101Mpa). o , unit: g / m 3 .

[0033] Step 103: Calculate the volume coefficient of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir according to the buried depth of the crude oil cracking gas reservoir and ancient oil reservoir.

[0034] In the embodiment, the crude oil volume coefficient B oi , also known as the underground volume coefficient of crude oil, is defined as the volume of crude oil in the ground V f (i.e. the volume of formation oil) and its volume after degassing on the ground V s The ratio can be obtained according to the Standing empirical formula:

[0035] B oi =0.972+1.1213×10 -2 F 1.175

[0036]

[0037] Among them, R s is the volume ratio of dissolved gas and oil; Ro is the relative density of ground degassed crude oil; Rg is the relative density of separator gas, and the air density is taken as 1.0 kg / m 3 ; T is the formation temperature read at the depth of the ancient oil reservoir determined according to the burial history, in K.

[0038] Step 104, calculating the cracking rate of crude oil in the crude oil cracking gas reservoir and the ancient oil reservoir.

[0039] In the specific implementation, a glass syringe is used to extract an appropriate amount of crude oil (weight is m1) and inject it into the gold tube. According to the steps of the gold tube hydrocarbon generation thermal simulation experiment, it is gradually heated to the limit temperature. After the crude oil is completely cracked, the residual sample is taken out and its weight is m2. The amount of crude oil cracking is m1-m2, and the cracking rate is X m =(m1-m2) / m1.

[0040] Step 105: Obtain the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir.

[0041] In specific implementation, the volume of natural gas can be measured by using a high-pressure physical property PVT cylinder to keep the natural gas at constant temperature and pressure under the temperature and pressure conditions of the gas reservoir, and then the natural gas can be placed under standard conditions on the ground (293K, 0.101Mpa) to measure its volume. The deviation coefficient Z of the original gas in the gas reservoir can be calculated based on the gas state equation. i .

[0042] Step 106, calculating the area of ​​the crude oil cracking gas reservoir and paleo-oil reservoir according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas.

[0043] The method for calculating the area of ​​crude oil cracking gas reservoir and ancient oil reservoir provided by the embodiment of the present invention obtains the formation temperature and formation pressure of the crude oil cracking gas reservoir and ancient oil reservoir, obtains the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under standard ground conditions, calculates the volume coefficient of the crude oil in the crude oil cracking gas reservoir and ancient oil reservoir according to the burial depth of the crude oil cracking gas reservoir and ancient oil reservoir, calculates the cracking rate of the crude oil in the crude oil cracking gas reservoir and ancient oil reservoir, and obtains the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir; the area of ​​the crude oil cracking gas reservoir and ancient oil reservoir can be calculated according to the formation temperature, formation pressure, density of crude oil under standard ground conditions, volume coefficient of crude oil, cracking rate of crude oil and deviation coefficient of original gas; the calculation is simple, the accuracy is high and the method has strong practicality.

[0044] like Figure 2 As shown, before obtaining the formation temperature and formation pressure of the crude oil cracking gas reservoir and the ancient oil reservoir, the method further includes:

[0045] Step 201: Establish a calculation formula for the area of ​​crude oil cracking gas reservoir and ancient oil reservoir.

[0046] The area of ​​the crude oil cracking gas reservoir and paleo-oil reservoir is calculated according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas, including:

[0047] Substituting the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas into the calculation formula of the crude oil cracking gas reservoir and paleo-oil reservoir area;

[0048] The area of ​​crude oil cracking gas reservoir and ancient oil reservoir is calculated using the calculation formula of crude oil cracking gas reservoir and ancient oil reservoir area.

[0049] In the embodiment of the present invention, the calculation formula of the crude oil cracking gas reservoir ancient oil reservoir area is:

[0050]

[0051] Where Ao is the area of ​​the original reservoir, in m 2 ; Ag is the current gas reservoir gas-bearing area, m 2 ;X m B is the crude oil cracking rate, which means the percentage of the total mass of generated natural gas to the mass of crude oil; oi is the crude oil volume coefficient; ρ g is the density of natural gas under standard ground conditions, which is 0.667 kg / m 3 ρ o It is the density of oil under standard conditions on the ground, in kg / m 3 ρ b is the density of asphalt, in kg / m 3 ; Z i is the original gas deviation coefficient; P sc is the ground standard pressure, which is 0.101MPa; T is the formation temperature, K; P i is the gas reservoir formation pressure, MPa; T sc is the standard ground temperature, 293K.

[0052] The following is a description of the derivation process of the calculation formula for the crude oil cracking gas reservoir paleo-reservoir area:

[0053] The geological model is set as follows:

[0054] (1) Today’s natural gas is produced by cracking petroleum, without kerogen-generated gas;

[0055] (2) The reservoir properties remain unchanged before and after crude oil cracking, the amount of natural gas loss is small, and the gas saturation = oil saturation.

[0056] According to the requirements of the "Calculation Method for Controlled Reserves of Petroleum and Natural Gas (Q / SY 179-2006)", the volumetric method is used to calculate geological reserves. The calculation formula is:

[0057] G=A g ×h×φ×S gi / B gi [1]

[0058] N=A o ×h×φ×S oi / B oi [2]

[0059] B gi =(P sc ×Z i×T) / (P i ×T sc ) [3]

[0060] Where: G is the geological reserves of natural gas, m 3 ; A g is the gas-bearing area, m 2 ; N is the geological reserves of oil, m 3 ; A o is the geological reserves of petroleum, m 3 ; h is the effective thickness, m; φ is the effective porosity, decimal; S gi is the initial gas saturation, decimal; S oi is the original oil saturation, decimal; B gi is the original natural gas volume coefficient, dimensionless; B oi is the original oil volume coefficient, dimensionless; P sc is the standard ground pressure, which is 0.101MPa; Z i is the original gas deviation coefficient; T is the formation temperature, K; P i is the gas reservoir formation pressure, MPa; T sc is the standard ground temperature, 293K.

[0061] The geological model shows that the amount of loss is small, so the gas reservoir area is greater than or equal to the original oil reservoir area. It can be seen that the current gas-bearing area Ag (unit: m 2 ) consists of two parts, one is the area of ​​the original reservoir A o (Unit: m 2 , this parameter is an unknown quantity and is the parameter sought in this invention), the area of ​​the other part of the natural gas expansion: A g -A o The parameters in the above formula corresponding to these two parts are only different in effective porosity φ. The pores within the original reservoir have a smaller porosity due to the filling of asphalt. Assume that the residual porosity after reservoir cracking is φ o , the porosity within the area where natural gas expands is the original porosity φ.

[0062] According to formula [1], the current natural gas geological reserves in the gas-bearing area are:

[0063] G=[A o ×h×φ o ×Sgi+(A g -A o )×h×φ×S gi ] / B gi [4]

[0064] According to the density of natural gas under standard conditions on the ground, ρ g , unit is kg / m3 , then the quality of natural gas in the gas reservoir is:

[0065] M g =[A o ×h×φ o ×S gi +(A g -A o )×h×φ×S gi ]×ρ g / B gi [5]

[0066] M g is the mass of natural gas, in kg.

[0067] According to the cracking rate and the law of mass conservation, the mass of natural gas is converted into the mass of crude oil before cracking:

[0068] M o =M g / X m [6]

[0069] M o —The mass of crude oil, in kg, substitute equation [5] into equation [6], and we get:

[0070] M o =[A o ×φ o +(A g -A o )×φ]×h×S gi ×ρ g / (X m ×B gi ) [7]

[0071] According to formula [2], the geological reserves of the original reservoir are:

[0072] M o =A o ×h×φ×S oi ×ρ o / B oi [8]

[0073] In formula [8], S oi is the original oil saturation, a decimal, for simplicity, S oi =S gi .

[0074] After the crude oil in the reservoir is cracked, the total remaining mass is:

[0075] M s =V×φ×ρ o ×(1-X m ) / Boi [9]

[0076] M s is the residual weight of crude oil after cracking, kg; V is the total volume of the reservoir, m 3 .

[0077] The total weight of bitumen in the reservoir pores is:

[0078] M b =V×(φ-φ o )×ρ b

[10]

[0079] M b is the total weight of asphalt in the reservoir pores, kg; V is the total volume of the reservoir, m 3 ρ b is the density of asphalt, in kg / m 3 .

[0080] According to the law of mass conservation, the weight of asphalt in the pores is equal to the residual weight after crude oil cracking, that is:

[0081] V×φ×ρ o ×(1-Xm) / B oi =V×(φ-φ o )×ρ b

[11]

[0082] After sorting, we can get:

[0083] φo=φ×[1-(1-X m )×ρ o / (ρ b ×B oi )]

[12]

[0084] Combining equations [7] and [8], we get

[0085] A o ×h×φ×S gi ×ρ o / Boi=[A o ×φ o +(A g -A o )×φ]×h×S gi ×ρ g / (X m ×B gi )

[13]

[0086] After finishing, we get:

[0087] A o =(A g ×φ×ρ g ×Boi ) / [X m ×B gi ×φ×ρ o +(φ-φ o )×B oi ×ρ g ]

[14]

[0088] Substituting equation

[12] and equation [3] into equation

[14] , we obtain:

[0089]

[0090] Based on the same inventive concept, an apparatus for calculating the area of ​​ancient oil reservoirs in crude oil cracking gas reservoirs is also provided in an embodiment of the present invention, as described in the following embodiment. Since the principle of solving the problem by the apparatus for calculating the area of ​​ancient oil reservoirs in crude oil cracking gas reservoirs is similar to the method for calculating the area of ​​ancient oil reservoirs in crude oil cracking gas reservoirs, the implementation of the apparatus for calculating the area of ​​ancient oil reservoirs in crude oil cracking gas reservoirs can refer to the implementation of the method for calculating the area of ​​ancient oil reservoirs in crude oil cracking gas reservoirs, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0091] Figure 3 A schematic diagram of a crude oil cracking gas reservoir paleo-reservoir area calculation device provided in an embodiment of the present invention is shown in FIG. Figure 3 Said device comprises:

[0092] The temperature and pressure acquisition module 301 is used to acquire the formation temperature and formation pressure of the crude oil cracking gas reservoir and the ancient oil reservoir;

[0093] Density acquisition module 302, used to acquire the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under ground standard conditions;

[0094] The volume coefficient acquisition module 303 is used to calculate the volume coefficient of crude oil in the crude oil cracking gas reservoir and the ancient oil reservoir according to the buried depth of the crude oil cracking gas reservoir and the ancient oil reservoir;

[0095] The cracking rate calculation module 304 is used to calculate the cracking rate of crude oil in the crude oil cracking gas reservoir and the ancient oil reservoir;

[0096] The deviation coefficient acquisition module 305 is used to obtain the deviation coefficient of the original gas in the crude oil cracking gas reservoir and the ancient oil reservoir;

[0097] The area calculation module 306 is used to calculate the area of ​​the crude oil cracking gas reservoir and paleo-oil reservoir according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas.

[0098] In the embodiment of the present invention, Figure 4 As shown, the device comprises:

[0099] A formula establishment module 401 is used to establish a calculation formula for the area of ​​the crude oil cracking gas reservoir and the ancient oil reservoir;

[0100] The area calculation module 306 is further used to:

[0101] Substituting the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas into the calculation formula of the crude oil cracking gas reservoir and paleo-oil reservoir area;

[0102] The area of ​​crude oil cracking gas reservoir and ancient oil reservoir is calculated using the calculation formula of crude oil cracking gas reservoir and ancient oil reservoir area.

[0103] In the embodiment of the present invention, the calculation formula of the crude oil cracking gas reservoir ancient oil reservoir area is:

[0104]

[0105] Where Ao is the area of ​​the original reservoir, in m 2 ; Ag is the current gas reservoir gas-bearing area, m 2 ;X m B is the crude oil cracking rate, which means the percentage of the total mass of generated natural gas to the mass of crude oil; oi is the crude oil volume coefficient; ρ g is the density of natural gas under standard ground conditions, which is 0.667 kg / m 3 ρ o It is the density of oil under standard conditions on the ground, in kg / m 3 ρ b is the density of asphalt, in kg / m 3 ; Z i is the original gas deviation coefficient; P sc is the ground standard pressure, which is 0.101MPa; T is the formation temperature, K; P i is the gas reservoir formation pressure, MPa; T sc is the standard ground temperature, 293K.

[0106] In the embodiment of the present invention, the volume coefficient B of the crude oil oi The calculation formula is:

[0107] B oi =0.972+1.1213×10 -2 F 1.175

[0108]

[0109] Among them, R s is the volume ratio of dissolved gas and oil; Ro is the relative density of ground degassed crude oil; Rg is the relative density of separator gas, and the air density is taken as 1.0 kg / m 3 ; T is the formation temperature read at the depth of the ancient oil reservoir determined according to the burial history, in K.

[0110] In order to achieve the above object, according to another aspect of the present application, a computer device is also provided. Figure 5 As shown, the computer device includes a memory, a processor, a communication interface and a communication bus. A computer program that can be executed on the processor is stored in the memory. When the processor executes the computer program, the steps in the above-mentioned embodiment method are implemented.

[0111] The processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0112] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs and units, such as the corresponding program units in the above method embodiments of the present invention. The processor executes various functional applications of the processor and works data processing by running the non-transitory software programs, instructions and modules stored in the memory, that is, implementing the method in the above method embodiments.

[0113] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0114] The one or more units are stored in the memory, and when executed by the processor, the method in the above embodiment is performed.

[0115] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.

[0116] In summary, the present invention overcomes the defects and deficiencies of the existing technology for determining the area of ​​ancient oil reservoirs in oil and gas basins. In the process of studying the dynamic accumulation of reservoir geology, the method for quantitatively calculating the area of ​​ancient oil reservoirs is based on the experimentally measured oil and gas density, asphalt density, crude oil volume coefficient, crude oil cracking rate, methane compression factor and known carbonate gas reservoir temperature, pressure and other parameters, and then the geological reserves of the ancient oil reservoir are estimated, which improves the reliability and accuracy of the results and is more practical. The present invention has the advantages of simple structure, reasonable design, strong practicality, low production cost, etc.

[0117] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0118] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for calculating the area of ​​crude oil cracking gas reservoirs and ancient oil reservoirs, characterized in that: include: Obtain formation temperature and formation pressure of crude oil cracking gas reservoir and ancient oil reservoir; Obtain the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under standard ground conditions; According to the burial depth of crude oil cracking gas reservoir and ancient oil reservoir, the volume coefficient of crude oil in crude oil cracking gas reservoir and ancient oil reservoir is calculated; Calculate the cracking rate of crude oil in crude oil cracking gas reservoirs and ancient oil reservoirs; Obtain the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir; Calculate the area of ​​crude oil cracking gas reservoir and paleo-oil reservoir according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas; Before obtaining the formation temperature and formation pressure of the crude oil cracking gas reservoir and the ancient oil reservoir, the method further comprises: Establish a calculation formula for the area of ​​crude oil cracking gas reservoirs and ancient oil reservoirs; The calculation formula of the crude oil cracking gas reservoir paleo-reservoir area is: Where Ao is the area of ​​the original reservoir, in m 2 ; Ag is the current gas reservoir gas-bearing area, m 2 ;X m B is the crude oil cracking rate, which means the percentage of the total mass of generated natural gas to the mass of crude oil; oi is the crude oil volume coefficient; ρ g is the density of natural gas under standard ground conditions, which is 0.667 kg / m 3 ρ o It is the density of oil under standard conditions on the ground, in kg / m 3 ρ b is the density of asphalt, in kg / m 3 ; Z i is the original gas deviation coefficient; P sc is the ground standard pressure, which is 0.101MPa; T is the formation temperature, K; P i is the gas reservoir formation pressure, MPa; T sc is the ground standard temperature, 293K; The volume coefficient B of the crude oil oi The calculation formula is: B oi =0.972+1.1213×10 -2 F 1.175 Among them, R s is the volume ratio of dissolved gas and oil; Ro is the relative density of ground degassed crude oil; Rg is the relative density of separator gas, and the air density is taken as 1.0 kg / m 3 ; T is the formation temperature read at the depth of the ancient oil reservoir determined according to the burial history, in K.

2. The method according to claim 1, characterized in that Calculating the area of ​​crude oil cracking gas reservoir and paleo-oil reservoir according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas, including: Substituting the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas into the calculation formula of the crude oil cracking gas reservoir and paleo-oil reservoir area; The area of ​​crude oil cracking gas reservoir and ancient oil reservoir is calculated using the calculation formula of crude oil cracking gas reservoir and ancient oil reservoir area.

3. A crude oil cracking gas reservoir ancient oil reservoir area calculation device, characterized in that: include: The temperature and pressure acquisition module is used to obtain the formation temperature and formation pressure of crude oil cracking gas reservoir and ancient oil reservoir; Density acquisition module, used to obtain the density of the same type of crude oil in the crude oil cracking gas reservoir and ancient oil reservoir under ground standard conditions; The volume coefficient acquisition module is used to calculate the volume coefficient of crude oil in the crude oil cracking gas reservoir and the ancient oil reservoir according to the burial depth of the crude oil cracking gas reservoir and the ancient oil reservoir; Cracking rate calculation module, used to calculate the cracking rate of crude oil in crude oil cracking gas reservoir and ancient oil reservoir; The deviation coefficient acquisition module is used to obtain the deviation coefficient of the original gas in the crude oil cracking gas reservoir and ancient oil reservoir; An area calculation module, used to calculate the area of ​​the crude oil cracking gas reservoir and paleo-oil reservoir according to the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas; Among them, it also includes: The formula building module is used to build the calculation formula for the area of ​​crude oil cracking gas reservoir and ancient oil reservoir; The calculation formula of the crude oil cracking gas reservoir paleo-reservoir area is: Where Ao is the area of ​​the original reservoir, in m 2 ; Ag is the current gas reservoir gas-bearing area, m 2 ;X m B is the crude oil cracking rate, which means the percentage of the total mass of generated natural gas to the mass of crude oil; oi is the crude oil volume coefficient; ρ g is the density of natural gas under standard ground conditions, which is 0.667 kg / m 3 ρ o It is the density of oil under standard conditions on the ground, in kg / m 3 ρ b is the density of asphalt, in kg / m 3 ; Z i is the original gas deviation coefficient; P sc is the ground standard pressure, which is 0.101MPa; T is the formation temperature, K; P i is the gas reservoir formation pressure, MPa; T sc is the ground standard temperature, 293K; The volume coefficient B of the crude oil oi The calculation formula is: B oi =0.972+1.1213×10 -2 F 1.175 Among them, R s is the volume ratio of dissolved gas and oil; Ro is the relative density of ground degassed crude oil; Rg is the relative density of separator gas, and the air density is taken as 1.0 kg / m 3 ; T is the formation temperature read at the depth of the ancient oil reservoir determined according to the burial history, in K.

4. The device according to claim 3, characterized in that The area calculation module is further used to: Substituting the formation temperature, the formation pressure, the density of the crude oil under standard ground conditions, the volume coefficient of the crude oil, the cracking rate of the crude oil, and the deviation coefficient of the original gas into the calculation formula of the crude oil cracking gas reservoir and paleo-oil reservoir area; The area of ​​crude oil cracking gas reservoir and ancient oil reservoir is calculated using the calculation formula of crude oil cracking gas reservoir and ancient oil reservoir area.

5. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 2 is implemented.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 2 is implemented.

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