Hydrocarbon reservoir phase state determination method and device, electronic equipment and medium

Abstract

The application discloses a kind of oil and gas reservoir phase state determination method, device, electronic equipment and medium.The method can include: obtaining crude oil physical data and n-alkane compound content in crude oil sample of reference work area;Establish the first fitting relationship of n-alkane compound content and crude oil physical data;For the oil and gas reservoir fluid of target work area, calculate the crude oil physical parameter of target work area by the first fitting relationship;According to the oil and gas reservoir phase state division standard and crude oil physical parameter of target work area, determine the oil and gas reservoir phase state type of target work area.The present application is simple, fast, economical, can quickly determine the phase state type of oil and gas reservoir, save experimental expenses, and can provide guidance for the expansion of oil field and new layer system exploration, oil and gas field development plan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas geochemistry exploration, and more particularly, to a method and device for determining the phase state of an oil and gas reservoir, an electronic device and a medium. BACKGROUND

[0002] With the deepening of oil and gas exploration and research, it is realized that the phase state characteristics of oil and gas reservoirs in the ground are controlled by multiple factors. At present, biodegraded heavy oil reservoirs can still be found in deep layers with a burial depth of 6500m, and volatile oil reservoirs still exist in ultra-deep layers with a burial depth of 8200m. Some condensate oil and gas reservoirs developed in deep layers of some basins are not primary ones, and often have the characteristics of "oil-heavy gas-dry". Such condensate oil and gas reservoirs are secondary condensate oil and gas reservoirs formed by evaporation fractionation of primary oil reservoirs.

[0003] The determination of the phase state of an oil and gas reservoir is the basis for the formulation of oil and gas exploration and development policies. At present, there are two categories of methods for determining the phase state of an oil and gas reservoir, i.e., phase state research methods and empirical statistical methods. The phase state research methods include the following four methods: phase diagram discrimination method, liquid volume and dimensionless pressure relationship curve discrimination method, condensate oil content and saturation pressure curve discrimination method, and dimensionless shrinkage rate and dimensionless pressure relationship curve discrimination method. The empirical statistical methods include the following methods: box diagram and C2 + content discrimination method, Ф1 parameter discrimination method, formation fluid density and average molecular weight discrimination method, reservoir fluid ternary composition triangular diagram, gas-oil ratio and unit reservoir fluid oil tank oil output relationship discrimination method, dispersed organic matter adsorbed gas C2 / C3 and iC4 / nC4 discrimination method in oil source rock, surface production gas-oil ratio and oil tank oil density relationship discrimination method, reservoir condensate gas C5 + value and C1 / C5 + value discrimination method, grade classification discrimination method, Z factor discrimination method, well production fluid ni-∑ni discrimination method, potential function discrimination method, aromatic content discrimination method, oil tank oil total hydrocarbon component discrimination method, C 14 ~ C 30 normal alkane content discrimination method, etc.

[0004] In the above identification methods, the phase state research method is an accurate and reliable oil and gas reservoir fluid phase state type identification method commonly used, but it is necessary to obtain representative reservoir fluid samples under the initial state, and to perform PVT experiments, so as to perform phase state research. The experimental analysis cost is not small. The empirical identification method requires less data, and after obtaining a small amount of analysis data on site, the type of oil and gas reservoir fluid can be preliminarily determined. However, for some low-oil wet gas reservoirs and condensate gas reservoirs, and the critical state oil and gas reservoirs between the condensate gas reservoirs and the oil reservoirs, the results of some empirical identification methods are not very accurate, and multiple empirical methods need to be combined with PVT experiments for comprehensive identification.

[0005] Therefore, it is necessary to develop an oil and gas reservoir phase state determination method, device, electronic equipment and medium.

[0006] The information disclosed in the Background section of this document is only intended to provide an overview of the general background of the application and should not be considered as an acknowledgement or any form of suggestion that this information forms the prior art. SUMMARY

[0007] The present application provides an oil and gas reservoir phase state determination method, device, electronic equipment and medium, which is simple, fast and economical, can quickly determine the phase state type of the oil and gas reservoir, save experimental funds, and provide guidance for the expansion of oil fields and the exploration of new layer systems, and the development of oil and gas field development plan.

[0008] In a first aspect, the present disclosure provides an oil and gas reservoir phase state determination method, comprising:

[0009] Obtaining crude oil property data and n-alkane compound content in a reference work area;

[0010] Establishing a first fitting relationship between the n-alkane compound content and the crude oil property data;

[0011] Sampling the oil and gas reservoir fluid of a target work area, and calculating the crude oil property parameters of the target work area through the first fitting relationship;

[0012] According to the oil and gas reservoir phase state division standard of the target work area and the crude oil property parameters, the oil and gas reservoir phase state type of the target work area is determined.

[0013] Preferably, the crude oil property data includes crude oil density and viscosity.

[0014] Preferably, the first fitting relationship between the n-alkane compound content and the crude oil property data is:

[0015] y1=a ln x1+b (1)

[0016] Wherein, y1 is the density of the reference work area crude oil sample, x1 is the content of the n-alkane of the reference work area sample, and a and b are fitting parameters.

[0017] Preferably, it further comprises:

[0018] Establishing a relationship between the logarithm of the molar concentration of n-alkane and the carbon number, and drawing a linear relationship diagram;

[0019] Judging whether there is a breakpoint carbon number of n-alkane in the linear relationship diagram, if there is, calculating the gas-oil ratio, and determining the oil and gas reservoir phase state type of the target work area through the gas-oil ratio.

[0020] Preferably, the calculating the gas-oil ratio comprises:

[0021] obtaining the content of the adamantane compound in the crude oil in the reference work area;

[0022] establishing a second fitting relationship between the content of the adamantane compound and the gas-oil ratio;

[0023] sampling the reservoir fluid of the target work area, and calculating the gas-oil ratio of the target work area through the second fitting relationship.

[0024] Preferably, the second fitting relationship between the content of the adamantane compound and the gas-oil ratio is:

[0025]

[0026] wherein y2 is the gas-oil ratio of the reservoir in the reference work area, x2 is the content of (4-+3-) methyl bisadamantane in the crude oil in the reference work area, and c and d are fitting parameters.

[0027] As a specific implementation manner of the embodiments of the present disclosure,

[0028] In a second aspect, the embodiments of the present disclosure further provide an oil and gas reservoir phase state determination device, comprising:

[0029] a reference work area data acquisition module, configured to obtain the crude oil property data and the content of the n-alkane compound in the crude oil sample in the reference work area;

[0030] a fitting module, configured to establish a first fitting relationship between the content of the n-alkane compound and the crude oil property data;

[0031] a calculation module, configured to sample the reservoir fluid of the target work area, and calculate the crude oil property parameter of the target work area through the first fitting relationship;

[0032] a target work area phase state prediction module, configured to determine the type of the oil and gas reservoir phase state of the target work area according to the oil and gas reservoir phase state division standard and the crude oil property parameter of the target work area.

[0033] Preferably, the crude oil property data comprises the density and viscosity of the crude oil.

[0034] Preferably, the first fitting relationship between the content of the n-alkane compound and the crude oil property data is:

[0035] y1=a ln x1+b (1)

[0036] wherein y1 is the density of the crude oil sample in the reference work area, x1 is the content of the n-alkane in the sample in the reference work area, and a and b are fitting parameters.

[0037] Preferably, the device further comprises:

[0038] establishing a linear relationship between the logarithm of the molar concentration of n-alkanes and the carbon number;

[0039] determining whether there is a breakpoint carbon number of n-alkanes in the linear relationship graph, and if so, calculating a gas-oil ratio, and determining the phase type of the oil and gas reservoir of the target work area through the gas-oil ratio.

[0040] Preferably, the calculation of the gas-oil ratio comprises:

[0041] obtaining the content of adamantane compounds in crude oil in a reference work area;

[0042] establishing a second fitting relationship between the content of adamantane compounds and the gas-oil ratio;

[0043] sampling the oil and gas reservoir fluid of the target work area, and calculating the gas-oil ratio of the target work area through the second fitting relationship.

[0044] Preferably, the second fitting relationship between the content of adamantane compounds and the gas-oil ratio is:

[0045]

[0046] wherein y2 is the gas-oil ratio of the oil and gas reservoir in the reference work area, x2 is the content of (4-+3-) methyl bisadamantane in the crude oil in the reference work area, and c and d are fitting parameters.

[0047] In a third aspect, the embodiments of the present disclosure further provide an electronic device, which comprises:

[0048] a memory storing executable instructions;

[0049] a processor running the executable instructions in the memory to implement the oil and gas reservoir phase determination method.

[0050] In a fourth aspect, the embodiments of the present disclosure further provide a computer readable storage medium storing a computer program, which is executed by a processor to implement the oil and gas reservoir phase determination method.

[0051] The beneficial effects thereof are:

[0052] The method is simple, fast and economical, can quickly determine the phase type of the oil and gas reservoir, save experimental funds, and provide guidance for the expansion of oil fields and the exploration of new layer systems, and the formulation of oil and gas field development plans.

[0053] The method and apparatus of the present application have other features and advantages which will be apparent from or that will be elaborated upon in the accompanying drawings and the detailed description which follows, and which are deemed incorporated herein in the abstract. BRIEF DESCRIPTION OF DRAWINGS

[0054] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout and in which:

[0055] Figure 1 A flow chart showing the steps of a method of oil and gas reservoir phase determination according to one embodiment of the present application.

[0056] Figure 2 A block diagram showing an oil and gas reservoir phase determination apparatus according to one embodiment of the present application.

[0057] BRIEF DESCRIPTION OF DRAWINGS

[0058] 201, reference work area data acquisition module; 202, fitting module; 203, calculation module; 204, target work area phase prediction module. DETAILED DESCRIPTION

[0059] Preferred embodiments of the present application will be described in more detail below. Although the following describes preferred embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0060] In view of the problem of determining the phase of an oil and gas reservoir in the prior art, the present inventors have utilized two compounds in different phase oil and gas reservoir samples in a reference work area: one is the most abundant compound in crude oil, the n-alkane series compound, and the other is a stable compound in crude oil, the adamantane series compound. According to the content of the n-alkane and adamantane series compounds in the crude oil of the target work area, the density (or viscosity) of the crude oil of the oil and gas reservoir is determined, and the gas-oil ratio of the oil and gas reservoir is determined, and then the phase type of the oil and gas reservoir in the target work area is determined, thereby guiding the exploration and development of the oil and gas reservoir.

[0061] The present application provides a method of determining the phase of an oil and gas reservoir, comprising:

[0062] Acquiring the physical property data of the crude oil of the reference work area and the content of the n-alkane compound in the crude oil sample;

[0063] Establishing a first fitting relationship between the content of the n-alkane compound and the physical property data of the crude oil;

[0064] The oil and gas reservoir fluid of the target working area is sampled, and the crude oil property parameters of the target working area are calculated through the first fitting relationship.

[0065] According to the oil and gas reservoir phase state division standard and the crude oil property parameters of the target working area, the oil and gas reservoir phase state type of the target working area is determined.

[0066] In one example, the crude oil property data includes crude oil density, viscosity.

[0067] In one example, the first fitting relationship between the content of n-alkane compounds and the crude oil property data is:

[0068] y1=a ln x1+b (1)

[0069] Wherein, y1 is the density of the reference working area crude oil sample, x1 is the content of n-alkane in the reference working area sample, a and b are fitting parameters.

[0070] In one example, it also includes:

[0071] The relationship between the logarithm of the molar concentration of n-alkane and the carbon number is established, and a linear relationship diagram is drawn;

[0072] It is judged whether there is a breakpoint carbon number of n-alkane in the linear relationship diagram, if there is, the gas-oil ratio is calculated, and the oil and gas reservoir phase state type of the target working area is determined through the gas-oil ratio.

[0073] In one example, calculating the gas-oil ratio includes:

[0074] The content of the reference working area crude oil adamantane compound is obtained;

[0075] The second fitting relationship between the content of adamantane compound and the gas-oil ratio is established;

[0076] The oil and gas reservoir fluid of the target working area is sampled, and the gas-oil ratio of the target working area is calculated through the second fitting relationship.

[0077] In one example, the second fitting relationship between the content of adamantane compound and the gas-oil ratio is:

[0078]

[0079] Wherein, y2 is the gas-oil ratio of the reference working area oil and gas reservoir, x2 is the content of (4-+3-) methyl adamantane in the reference working area crude oil, and c and d are fitting parameters.

[0080] Specifically, the crude oil property data and the content of n-alkane compounds in the crude oil sample of the reference working area are obtained, and the n-alkane compounds in the crude oil are quantified using full oil chromatography and / or total ion flow diagram TIC and / or mass chromatogram m / z 85; the crude oil property data includes crude oil density, viscosity, and the n-alkane series compounds at least include nC10 + The above are n-alkanes.

[0081] Since dry gas reservoirs contain no liquid fluids, the physical properties of crude oil samples from different phases of oil and gas reservoirs are excluded, including crude oil density, viscosity, wax content, and sulfur content, for all types of oil and gas reservoirs other than dry gas reservoirs. Existing research shows that crude oil density is a better indicator of the phase of an oil and gas reservoir than other physical properties (such as viscosity). Therefore, crude oil density can be used as a substitute when analyzing crude oil physical properties. It is worth noting that the use of crude oil density to replace crude oil physical properties in data processing is merely for better illustration of the invention and does not constitute an undue limitation of the invention.

[0082] The gas-oil ratio (GOR) of an oil and gas reservoir is an important parameter reflecting the phase state of the reservoir. The boundary between oil reservoirs and condensate gas reservoirs, and between condensate gas reservoirs and wet gas reservoirs in a specific basin may vary slightly depending on the basin.

[0083] It also includes: establishing the relationship between the logarithm of the molar concentration of n-alkane ln(M(nCi)) and the number of carbons nCi, and drawing a linear relationship diagram; determining whether there is a breakpoint carbon number for n-alkane in the linear relationship diagram, and if so, calculating the gas-oil ratio, and determining the oil and gas reservoir phase type of the target working area through the gas-oil ratio.

[0084] The first fitting relationship between the content of n-alkane compounds and crude oil physical property data is established by formula (1); if there is a breakpoint carbon number of n-alkane in the linear relationship graph, the content of adamantane compounds in crude oil in the reference working area is obtained; the adamantane series compounds include at least monoadamantane series compounds and diadamantane series compounds, preferably (4-+3-)methyldiadamantane in diadamantane compounds, and the monoadamantane series compounds, diadamantane series compounds, and triadamantane series compounds in crude oil are quantified by using chromatography-mass spectrometry analysis and / or chromatography × chromatography-time-of-flight mass spectrometry analysis of mass chromatograms; the second fitting relationship between the content of adamantane compounds and the gas-oil ratio is established by formula (2).

[0085] The n-alkane series of compounds is chosen as a parameter for determining the phase state of oil and gas reservoirs because the n-alkane content in crude oil gradually decreases with increasing biodegradation. Therefore, in biodegraded heavy oil, the n-alkane content decreases, and in severely biodegraded crude oil, n-alkane disappears. As crude oil maturity increases, crude oil density decreases, and the n-alkane content increases. In volatile oil and condensate oil, low-carbon n-alkanes are often the dominant type. Therefore, n-alkane series compounds can be used to identify the phase type of oil and gas reservoirs.

[0086] The adamantane compound is selected as a parameter for identifying the oil and gas reservoir phase state because with the increase of the temperature of the oil and gas reservoir, the oil and gas reservoir phase state is continuously evolved from normal crude oil, light crude oil, volatile crude oil, condensate oil and wet gas reservoir, the content of the adamantane compound in the crude oil in the oil and gas reservoir is gradually increased, the secondary condensate oil formed by the evaporation and fractionation often has the characteristics of gas dry oil, and the content of the adamantane compound in the crude oil is usually high (Zhang et al, 2011), which is different from the content of the adamantane in the black oil reservoir. The adamantane series compound in the crude oil has an exponential correlation with the gas-oil ratio of the oil and gas reservoir.

[0087] The oil and gas reservoir fluid of the target working area is sampled, the mass spectrum information of the crude oil sample of the reference working area is obtained by mass spectrum analysis and processing of the crude oil sample of the reference working area, the crude oil physical property parameters of the target working area are calculated through the first fitting relationship, and if the breakpoint carbon number of the n-alkane exists in the linear relationship diagram, the gas-oil ratio of the target working area is calculated through the second fitting relationship.

[0088] The oil and gas reservoir phase state type of the target working area is determined according to the oil and gas reservoir phase state division standard and the crude oil physical property parameters of the target working area, and if the breakpoint carbon number of the n-alkane exists in the linear relationship diagram, the oil and gas reservoir phase state type of the target working area is determined according to the oil and gas reservoir phase state division standard, the crude oil physical property parameters and the gas-oil ratio of the target working area.

[0089] The application further provides an oil and gas reservoir phase state determination device, which comprises:

[0090] The reference working area data acquisition module acquires the crude oil physical property data and the content of the n-alkane compound in the crude oil sample of the reference working area.

[0091] The fitting module establishes the first fitting relationship between the content of the n-alkane compound and the crude oil physical property data.

[0092] The calculation module samples the oil and gas reservoir fluid of the target working area, and calculates the crude oil physical property parameters of the target working area through the first fitting relationship.

[0093] The target working area phase state prediction module determines the oil and gas reservoir phase state type of the target working area according to the oil and gas reservoir phase state division standard and the crude oil physical property parameters of the target working area.

[0094] In one example, the crude oil physical property data includes the crude oil density and viscosity.

[0095] In one example, the first fitting relationship between the content of the n-alkane compound and the crude oil physical property data is:

[0096] y1=a ln x1+b (1)

[0097] Wherein, y1 is the reference work area crude oil sample density, x1 is the reference work area sample n-alkane content, a, b is the fitting parameter.

[0098] In one example, further comprising:

[0099] Establishing the relationship between the logarithm of the n-alkane molar concentration and the carbon number, drawing a linear relationship diagram;

[0100] Judging whether there is a breakpoint carbon number of n-alkane in the linear relationship diagram, if there is, calculating the gas-oil ratio, and determining the oil and gas reservoir phase state type of the target work area through the gas-oil ratio.

[0101] In one example, calculating the gas-oil ratio comprises:

[0102] Obtaining the content of adamantane compounds in the reference work area crude oil;

[0103] Establishing a second fitting relationship between the content of adamantane compounds and the gas-oil ratio;

[0104] Sampling the oil and gas reservoir fluid of the target work area, and calculating the gas-oil ratio of the target work area through the second fitting relationship.

[0105] In one example, the second fitting relationship between the content of adamantane compounds and the gas-oil ratio is:

[0106]

[0107] Wherein, y2 is the reference work area oil and gas reservoir gas-oil ratio, x2 is the content of (4-+3-) methyl adamantane in the reference work area crude oil, c, d is the fitting parameter.

[0108] Specifically, the reference work area data acquisition module obtains the crude oil property data of the reference work area and the content of n-alkane compounds in the crude oil sample, and uses full oil chromatography and / or total ion flow diagram TIC and / or mass chromatogram m / z 85 to quantify the n-alkane compounds in the crude oil; the crude oil property data includes crude oil density, viscosity, and n-alkane series compounds at least including nC 10 + The above n-alkane.

[0109] Further comprising: establishing the relationship between the logarithm of the n-alkane molar concentration ln(M(nCi)) and the carbon number nCi, drawing a linear relationship diagram; judging whether there is a breakpoint carbon number of n-alkane in the linear relationship diagram, if there is, calculating the gas-oil ratio, and determining the oil and gas reservoir phase state type of the target work area through the gas-oil ratio.

[0110] The fitting module establishes a first fitting relationship between the content of n-alkane compounds and the physical property data of the crude oil as formula (1); if there is a breakpoint carbon number of n-alkane in the linear relationship diagram, the content of adamantane compounds in the reference work area is obtained; the adamantane series compounds at least include single adamantane series compounds, double adamantane series compounds, and preferably (4-+3-) methyl bisadamantane in the double adamantane compound; the mass chromatogram of the single adamantane series compound, the double adamantane series compound and the triple adamantane series compound in the crude oil is analyzed by using chromatography-mass spectrometry and / or chromatography x chromatography-time of flight mass spectrometry; and a second fitting relationship between the content of adamantane compounds and the gas oil ratio is established as formula (2).

[0111] The computing module samples the reservoir fluid of the target work area, performs mass spectrometry analysis on the crude oil sample of the reference work area, and obtains the mass spectrometry information of the crude oil sample of the reference work area; the physical property parameters of the crude oil of the target work area are calculated through the first fitting relationship; if there is a breakpoint carbon number of n-alkane in the linear relationship diagram, the gas oil ratio of the target work area is calculated through the second fitting relationship.

[0112] The phase state prediction module determines the type of the reservoir phase state of the target work area according to the reservoir phase state division standard and the physical property parameters of the crude oil of the target work area; if there is a breakpoint carbon number of n-alkane in the linear relationship diagram, the type of the reservoir phase state of the target work area is determined according to the reservoir phase state division standard, the physical property parameters of the crude oil and the gas oil ratio of the target work area.

[0113] The present application also provides an electronic device, which comprises a memory storing executable instructions, and a processor running the executable instructions in the memory to realize the reservoir phase state determination method.

[0114] The present application also provides a computer readable storage medium storing a computer program, which is executed by a processor to realize the reservoir phase state determination method.

[0115] In order to facilitate understanding of the scheme and effects of the embodiments of the present application, four specific application examples are given below. Those skilled in the art should understand that the examples are only for the convenience of understanding the present application, and any specific details are not intended to limit the present application in any way.

[0116] Example 1

[0117] Figure 1 A flowchart showing the steps of the reservoir phase state determination method according to an embodiment of the present application is shown.

[0118] As Figure 1As shown, the oil and gas reservoir phase state determination method includes: step 101, obtaining crude oil property data and n-alkane compound content in a crude oil sample of a reference work area; step 102, establishing a first fitting relationship between the n-alkane compound content and the crude oil property data; step 103, sampling oil and gas reservoir fluid of a target work area, and calculating crude oil property parameters of the target work area through the first fitting relationship; and step 104, determining an oil and gas reservoir phase state type of the target work area according to an oil and gas reservoir phase state division standard and the crude oil property parameters of the target work area.

[0119] Obtaining the physical property parameters and the oil and gas reservoir gas-oil ratio parameters of the crude oil samples of the different phase state oil and gas reservoirs in the reference work area; and obtaining the density and the oil and gas reservoir gas-oil ratio data of the crude oil samples of a complete phase sequence of the medium-heavy heavy oil, the light-medium heavy oil, the conventional oil reservoir, the light oil reservoir, the volatile oil reservoir, the critical condensate gas reservoir, the condensate gas reservoir and the wet gas reservoir in the target work area.

[0120] Obtaining the n-alkane series compound content and the n-alkane molar concentration logarithm-carbon number distribution curve and the adamantane series compound content in the crude oil sample in the reference work area;

[0121] Using the total oil chromatography method and the total oil (or saturated hydrocarbon) chromatography-mass spectrometry method to analyze the content concentration of the n-alkane series in the different phase state crude oil samples in the reference work area, using the total oil chromatography method to analyze the n-alkane molar concentration of the crude oil, and using the total oil (or saturated hydrocarbon) chromatography-mass spectrometry method (GC-MS) or the chromatography-chromatography-time of flight mass spectrometry method (GCxGC-TOMS) to analyze the adamantane series compound content in the crude oil.

[0122] Through the total oil chromatography analysis of the different phase state crude oil samples in the reference work area, a linear relationship between the n-alkane series compound content and the n-alkane molar concentration logarithm-n-alkane carbon number can be obtained; in the total oil chromatography analysis, C 24 D 50 The n-alkane standard sample is used for quantitative analysis of the n-alkane in the total oil; the total oil chromatography instrument uses an HP6890N gas chromatograph. The analysis conditions are as follows: the injection port temperature is 300℃, the hydrogen flame detector (FID) temperature is 300℃, and the chromatographic column is a PONA column (50m x 0.20mm x 0.3μm). The temperature rising program is as follows: 35℃ constant temperature for 10min, then rising at 4℃ / min to 300℃, and then constant temperature for 50min. The column flow rate is 1.0mL / min, and the carrier gas is nitrogen (99.99%).

[0123] In the total oil chromatography method, the content of a n-alkane series compound of a certain carbon number in the crude oil is calculated according to the following formula:

[0124] Mnalakne=(M IS ×Analkane) / (AIS xM Oil ) (3)

[0125] Wherein, Mnalkane is the content of a carbon number n normal alkane in crude oil, mg / g oil; M IS is the content of a carbon number n normal alkane in crude oil, mg / g oil; M 24 D 50 is the content of a carbon number n normal alkane in crude oil, mg / g oil; M IS D 24 is the content of a carbon number n normal alkane in crude oil, mg / g oil; M 50 D Oil is the content of a carbon number n normal alkane in crude oil, mg / g oil; M 24 D 50 is the content of a carbon number n normal alkane in crude oil, mg / g oil; M + D 24 is the content of a carbon number n normal alkane in crude oil, mg / g oil; M 50 D

[0126] The total content of normal alkane series compounds in crude oil is the comprehensive content of all carbon number n normal alkane compounds that can be identified;

[0127] The calculation of the molar concentration content of normal alkane in crude oil is carried out according to the method proposed by Kissin (1987) and Losh et al. (2002), and in order to avoid the loss caused by volatilization, here only the molar concentration of >nC9

[0128] In the total oil (or saturated hydrocarbon) chromatography-mass spectrometry (GC-MS) analysis, the content of normal alkane in crude oil (or saturated hydrocarbon) can also be carried out according to formula (1), the difference is that in the GC-MS analysis, the total ion chromatogram (TIC) can be used for quantification; or the peak area of normal alkane series compounds is quantified by using the m / z 85 mass chromatogram, and the peak area of the standard C

[0129] The adamantane series compounds in crude oil (or saturated hydrocarbon) are analyzed by using chromatography-mass spectrometry (GC-MS) method and / or chromatography x chromatography-time of flight mass spectrometry (GC x GC-TOFMS) method; the chromatography-mass spectrometry information of mono-adamantane series, di-adamantane series and tri-adamantane series compounds in the crude oil sample is obtained.

[0130] The HP 6890 / 5975 chromatograph-mass spectrometer is used to identify and identify adamantane compounds in the crude oil sample. However, this specific embodiment is only for better illustration of the present application, and does not make undue limitation on the present application.

[0131] Saturated hydrocarbon chromatograph-mass spectrometer analysis conditions: the instrument is Agilent 6890 / 5975 mass spectrometer, the chromatographic column is HP-5MS quartz elastic capillary column (30m x 0.25mm x 0.25μm), the temperature program is 50℃ constant temperature 1min, 2℃ / min from 50℃ to 100℃, 3℃ / min to 315℃, constant temperature 16min, the injector temperature is 300℃, the carrier gas is helium, the flow rate is 1.00mL / min, the scanning range is 50-500amu, the detection mode is full scan+multi-ion (MID); ionization energy 70eV, ion source temperature is 230℃, D 16 -A is the quantitative internal standard of adamantane compounds.

[0132] In the analysis of adamantane compounds, m / z = 136, 135, 149, 163, 177, 191 are selected as the characteristic ions of monoadamantane series; m / z = 188, 187, 201, 215 are selected as the characteristic ions of bisadamantane series; m / z = 240, 239, 253 ions are selected as the characteristic ions of triadamantane series; D 16 The detection ion of monoadamantane is m / z = 152.

[0133] The content of adamantane compounds in crude oil is calculated according to the following formula:

[0134] M Di = (M IS × A Di ) / (A IS × M Oil ) (4)

[0135] In the formula, M Di is the content of a certain adamantane compound in crude oil, μg / g oil; M IS is the content of the internal standard compound, μg; A Di is the peak area of a certain adamantane compound in crude oil; A IS is the peak area of the internal standard compound; M Oil is the mass of crude oil, g. In the quantitative analysis of adamantane compounds, the difference between the response factors of monoadamantane and D 16 The difference between the response factors of monoadamantane and D

[0136] The total amount of adamantane compounds in crude oil is the sum of the contents of all quantified adamantane compounds, and (4-+3-) methyl bisadamantane can also be used instead of the content of adamantane compounds in crude oil.

[0137] The relationship between the content of n-alkane compounds in the reference work area and the properties of crude oil is established, that is, a fitting relationship between the properties of crude oil samples and the content of n-alkane series compounds is established:

[0138] y1 = -0.077ln(x1) + 1.2245 (5)

[0139] In the formula: y1 is the density of the reference work area crude oil sample, g / cm 3 ; x1 is the content of the n-alkane series in the reference work area sample.

[0140] The relationship between the content of adamantane series compounds in the reference work area and the gas-oil ratio of the oil and gas reservoir is established, that is, a fitting relationship between the gas-oil ratio of the oil and gas reservoir and the content of adamantane series compounds in the crude oil is established, and the content of (4-+3-) methyl adamantane is used as an index of the content of adamantane compounds, and the relationship is as follows:

[0141] y2 = 1.7318(x2) (6) 1.6267

[0142] In the formula, y2 is the gas-oil ratio of the reference work area oil and gas reservoir, m 3 / m 3 ; x2 is the content of (4-+3-) methyl adamantane in the reference work area crude oil, μg / g oil;

[0143] The content of n-alkane compounds and adamantane compounds in the crude oil sample in the target work area is obtained, and the property parameters and the gas-oil ratio data of the crude oil sample in the target work area are calculated according to the formulas (5) and (6).

[0144] According to the calculated property parameters (density) and the gas-oil ratio data of the crude oil sample in the target work area, the phase state type of the oil and gas reservoir fluid in the target work area is determined.

[0145] ​According to the calculated y1, y2 values, the target work area oil and gas reservoir phase type is divided into the following eight phase types: moderate-heavy heavy oil reservoir, light-moderate heavy oil reservoir, conventional oil reservoir, light oil reservoir, volatile oil reservoir, critical condensate gas reservoir, condensate gas reservoir and wet gas reservoir. y1<0.6, y2>15000, it is a wet gas reservoir; y1 is 0.6-0.8, y2>1000, it is a condensate gas reservoir; y1 is 0.76-0.81, y2 is 600-1000, it is a critical condensate gas reservoir; y1 is 0.76-0.82, y2 is 350-650, it is a volatile oil reservoir; y1 is 0.76-0.83, y2 is 10-350, it is a light oil reservoir; y1 is 0.83-0.87, y2 is 35-350, it is a conventional oil reservoir; y1 is 0.87-0.934, it is a light-moderate heavy oil reservoir; y1>0.934, it is a moderate-heavy heavy oil reservoir.

[0146] According to the content of n-alkane series compounds and adamantane series compounds in the detected crude oil, the higher the content of n-alkane and adamantane in the crude oil, the smaller the density of the oil and gas reservoir crude oil, and the better the quality of the crude oil.

[0147] Example 2

[0148] Figure 2 A block diagram of an oil and gas reservoir phase determination device according to an embodiment of the application is shown.

[0149] As shown in Figure 2 The oil and gas reservoir phase determination device comprises:

[0150] The reference work area data acquisition module 201 acquires the crude oil property data and the content of n-alkane compounds in the crude oil sample of the reference work area.

[0151] The fitting module 202 establishes a first fitting relationship between the content of n-alkane compounds and the crude oil property data.

[0152] The calculation module 203 samples the oil and gas reservoir fluid of the target work area, and calculates the crude oil property parameters of the target work area through the first fitting relationship.

[0153] The target work area phase prediction module 204 determines the oil and gas reservoir phase type of the target work area according to the oil and gas reservoir phase division standard and the crude oil property parameters of the target work area.

[0154] As an optional solution, the crude oil property data includes crude oil density and viscosity.

[0155] As an optional solution, the first fitting relationship between the content of n-alkane compounds and the crude oil property data is:

[0156] y1=a ln x1+b (1)

[0157] wherein y1 is the reference work area crude oil sample density, x1 is the content of n-alkanes in the reference work area sample, a and b are fitting parameters.

[0158] As an optional solution, further comprising:

[0159] Establishing a relationship between the logarithm of the molar concentration of n-alkanes and the carbon number, and drawing a linear relationship diagram;

[0160] Determining whether there is a breakpoint carbon number of n-alkanes in the linear relationship diagram, and if so, calculating the gas-oil ratio, and determining the reservoir phase state type of the target work area through the gas-oil ratio.

[0161] As an optional solution, calculating the gas-oil ratio comprises:

[0162] Obtaining the content of adamantane compounds in the crude oil in the reference work area;

[0163] Establishing a second fitting relationship between the content of adamantane compounds and the gas-oil ratio;

[0164] Sampling the reservoir fluid of the target work area, and calculating the gas-oil ratio of the target work area through the second fitting relationship.

[0165] As an optional solution, the second fitting relationship between the content of adamantane compounds and the gas-oil ratio is:

[0166]

[0167] wherein y2 is the gas-oil ratio of the reference work area reservoir, x2 is the content of (4-+3-) methyl adamantane in the crude oil in the reference work area, and c and d are fitting parameters.

[0168] Example 3

[0169] The present disclosure provides an electronic device, which comprises a memory storing executable instructions, and a processor running the executable instructions in the memory to implement the above-mentioned reservoir phase state determination method.

[0170] The electronic device according to the embodiments of the present disclosure comprises a memory and a processor.

[0171] The memory is configured to store non-transitory computer-readable instructions. Specifically, the memory can include one or more computer program products, which can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM), cache memory, and / or the like. The non-volatile memory may, for example, include read-only memory (ROM), hard disk, flash memory, and / or the like.

[0172] The processor can be a central processing unit (CPU) or other form of processing unit that has data processing and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions. In one embodiment of the present disclosure, the processor is configured to execute the computer-readable instructions stored in the memory.

[0173] Those skilled in the art will understand that, in order to solve the technical problem of how to obtain a good user experience effect, the embodiment can also include well-known structures such as a communication bus, an interface, and the like, which should also be included in the protection scope of the present disclosure.

[0174] Detailed descriptions of the embodiments can refer to the corresponding descriptions in the foregoing embodiments, which will not be repeated here.

[0175] Example 4

[0176] The present disclosure provides a computer-readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the oil and gas reservoir phase state determination method.

[0177] The computer-readable storage medium according to the embodiments of the present disclosure has non-transitory computer-readable instructions stored thereon. When the non-transitory computer-readable instructions are run by a processor, all or part of the steps of the method of the embodiments of the present disclosure are executed.

[0178] The computer-readable storage medium described above includes, but is not limited to, an optical storage medium (for example, a CD-ROM and a DVD), a magneto-optical storage medium (for example, an MO), a magnetic storage medium (for example, a magnetic tape or a mobile hard disk), a medium with a built-in rewritable non-volatile memory (for example, a memory card), and a medium with a built-in ROM (for example, a ROM cartridge).

[0179] Those skilled in the art will understand that the above description of the embodiments of the present disclosure is only for the purpose of exemplarily illustrating the beneficial effects of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure to any examples given.

[0180] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for determining the phase state of an oil and gas reservoir, characterized in that, include: Obtain crude oil physical property data and the content of n-alkane compounds in crude oil samples from the reference work area; Establish a first fitting relationship between the content of the n-alkane compounds and the physical property data of the crude oil; Sampling of oil and gas reservoir fluids in the target work area is performed, and the crude oil physical property parameters of the target work area are calculated using the first fitting relationship. Establish the relationship between the logarithm of the molar concentration of n-alkanes and the number of carbon atoms, plot a linear relationship graph, determine whether there is a breakpoint carbon number for n-alkanes in the linear relationship graph, and if so, calculate the gas-oil ratio; The oil and gas reservoir phase classification standard of the target work area, the crude oil physical properties and the gas-oil ratio are used to determine the oil and gas reservoir phase type of the target work area; The oil and gas reservoir phase types in the target work area include: medium-to-heavy heavy oil reservoirs, light-to-medium heavy oil reservoirs, conventional oil reservoirs, light oil reservoirs, volatile oil reservoirs, critical condensate gas reservoirs, condensate gas reservoirs, and wet gas reservoirs; The calculation of the gas-oil ratio includes: Obtain the adamantane compound content of crude oil in the reference work area; Establish a second fitting relationship between the content of the adamantane compound and the gas-oil ratio; The oil and gas reservoir fluids in the target work area are sampled, and the gas-oil ratio of the target work area is calculated using the second fitting relationship.

2. The method for determining the phase state of an oil and gas reservoir according to claim 1, wherein, The crude oil physical property data includes crude oil density and viscosity.

3. The method for determining the phase state of an oil and gas reservoir according to claim 1, wherein, The first fitting relationship between the content of the n-alkane compounds and the physical property data of the crude oil is as follows: （1） Where y1 is the density of crude oil sample in the reference working area, x1 is the content of n-alkane in the sample in the reference working area, and a and b are fitting parameters.

4. The method for determining the phase state of an oil and gas reservoir according to claim 1, wherein, The second fitting relationship between the adamantane compound content and the gas-oil ratio is: （2） Where y2 is the gas-oil ratio of the reference work area reservoir, x2 is the (4-+3-)methyldiadamantane content in the crude oil of the reference work area, and c and d are fitting parameters.

5. A device for determining the phase state of an oil and gas reservoir, characterized in that, include: The reference work area data acquisition module acquires crude oil physical property data and the content of n-alkane compounds in crude oil samples from the reference work area. The fitting module establishes a first fitting relationship between the content of the n-alkane compounds and the physical property data of the crude oil. The calculation module samples the oil and gas reservoir fluids in the target work area and calculates the crude oil physical property parameters of the target work area through the first fitting relationship. The gas-oil ratio calculation module establishes the relationship between the logarithm of the molar concentration of n-alkanes and the number of carbon atoms, plots a linear relationship graph, and determines whether there is a breakpoint carbon number for n-alkanes in the linear relationship graph. If so, the gas-oil ratio is calculated. The target work area phase prediction module determines the oil and gas reservoir phase type of the target work area based on the oil and gas reservoir phase classification standard of the target work area, the crude oil physical property parameters and the gas-oil ratio; The oil and gas reservoir phase types in the target work area include: medium-to-heavy heavy oil reservoirs, light-to-medium heavy oil reservoirs, conventional oil reservoirs, light oil reservoirs, volatile oil reservoirs, critical condensate gas reservoirs, condensate gas reservoirs, and wet gas reservoirs; The calculation of the gas-oil ratio includes: Obtain the adamantane compound content of crude oil in the reference work area; Establish a second fitting relationship between the content of the adamantane compound and the gas-oil ratio; The oil and gas reservoir fluids in the target work area are sampled, and the gas-oil ratio of the target work area is calculated using the second fitting relationship.

6. An electronic device, characterized in that, The electronic device includes: Memory, which stores executable instructions; A processor that executes the executable instructions in the memory to implement the method for determining the phase state of an oil and gas reservoir as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method for determining the phase state of an oil and gas reservoir as described in any one of claims 1-4.

Images