A method for obtaining a reservoir gas-oil ratio based on a gas logging pxtxler ratio

Abstract

The application discloses a method for obtaining reservoir gas-oil ratio based on gas logging Pickett ratio, which comprises the following steps: obtaining lithology and hydrocarbon content data of a well section providing gaseous hydrocarbon; the hydrocarbon content data is obtained by measuring drilling fluid; obtaining hydrocarbon increase rate data according to the lithology and the hydrocarbon content data; the hydrocarbon increase rate data comprises at least one of component and net increase rate and total hydrocarbon net increase rate; obtaining reservoir gas-oil ratio of the oil and gas reservoir according to the hydrocarbon increase rate data and a preset gas-oil ratio compensation coefficient. The application can more accurately obtain the reservoir gas-oil ratio, and realizes fine processing under different hydrocarbon source conditions in the data processing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploitation, and particularly relates to a method for obtaining reservoir gas-oil ratio based on gas logging Pikesler ratio. BACKGROUND

[0002] The oil and gas detection method in logging technology belongs to the application of oil reservoir geochemical analysis technology on the drilling site, and is gradually developed with the needs of oil and gas field exploration and development and the continuous progress of science and technology. It is the most timely and direct means for discovering and evaluating oil and gas reservoirs in oil and gas exploration and development. At present, it has developed into a modern comprehensive logging technology integrating geological logging, gas logging, drilling fluid logging, rock pyrolysis geochemical logging and drilling engineering while drilling monitoring. These detection and analysis methods are mature oil and gas display detection and evaluation technologies. Gas logging is to obtain the gas carried by the drilling fluid returned from the bottom of the well from a degasser, and to detect and record the components and total hydrocarbon content by chromatographic analysis, so as to judge the oil and gas layer logging technology, and to provide basic data for the discovery and evaluation of oil and gas layers. It is one of the main means for discovering oil and gas layers. The gas logging parameters mainly include: logging data such as total hydrocarbon (TG) automatically detected by continuous recording while drilling, hydrocarbon components (C1 (methane), C2 (ethane), C3 (propane), iC4 (isobutane), nC4 (n-butane), iC5 (isopentane) and nC5 (n-pentane)), and non-hydrocarbon components (H2S (hydrogen sulfide) and CO2 (carbon dioxide)). The downhole gas-oil ratio data need to be obtained through these parameters, so as to accurately judge the oil and gas layer.

[0003] However, the oil and gas reservoirs in different regions and different strata have different oil geological backgrounds. The difference in oil sources will form dry gas reservoirs, wet gas reservoirs, condensate reservoirs, light oil reservoirs, medium oil reservoirs and heavy oil reservoirs. Due to the difference in oil reservoir trap conditions, the oil and gas reservoirs will change in the long years after their formation. Factors such as light hydrocarbon evaporation, biodegradation and water washing will reform the oil and gas reservoirs through secondary action. The light hydrocarbon associated with crude oil is the most active and most susceptible to secondary action. Severe secondary action of oil and gas reservoirs will lead to the disappearance of heavy components in gas components, and the component detection is seriously incomplete, and even only methane can be seen. When the gas component is seriously incomplete, the gas-oil ratio cannot be calculated by using the gas component ratio characteristics. Therefore, there is an urgent need for a parameter or data processing method that can more accurately represent the reservoir gas-oil ratio. SUMMARY

[0004] In view of the above problems, the present application provides a method for obtaining reservoir gas-oil ratio based on gas logging Pikesler ratio, which can more accurately obtain the reservoir gas-oil ratio, and realizes fine processing under different hydrocarbon source conditions in the data processing process.

[0005] In a first aspect, the present application provides the following technical solutions through an embodiment:

[0006] A method for obtaining a gas-oil ratio of a reservoir based on a gas logging Pickett ratio, comprising:

[0007] obtaining lithology and hydrocarbon content data of a well section providing gaseous hydrocarbons; the hydrocarbon content data is data obtained by measuring drilling fluid; obtaining hydrocarbon increase rate data according to the lithology and hydrocarbon content data of the well section; the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate; obtaining a reservoir gas-oil ratio of an oil and gas reservoir according to the hydrocarbon increase rate data and a preset gas-oil ratio compensation coefficient.

[0008] Optionally, if the hydrocarbon content data contains light hydrocarbon data other than methane and ethane, the obtaining of the reservoir gas-oil ratio of the oil and gas reservoir according to the hydrocarbon increase rate data and the preset gas-oil ratio compensation coefficient comprises:

[0009] obtaining first ratio data and second ratio data between each component according to component data of each component in the hydrocarbon content data; wherein the first ratio data is ratio data of methane content and other component content, and the second ratio data is ratio data of other component content and methane content; obtaining the reservoir gas-oil ratio according to the first ratio data, the second ratio data, the hydrocarbon increase rate data, and the preset gas-oil ratio compensation coefficient; wherein the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate.

[0010] Optionally, the obtaining of the reservoir gas-oil ratio according to the first ratio data, the second ratio data, the hydrocarbon increase rate data, and the preset gas-oil ratio compensation coefficient comprises:

[0011] obtaining a first compensation parameter according to a product between each of the first ratio data; obtaining relative fluctuation data corresponding to each first target data according to a difference between each first target data and second target data; wherein the first target data is ratio data in the second ratio data other than the second target data, and the second target data is ratio data of ethane content data and methane content data; obtaining a second compensation parameter according to a product between each of the relative fluctuation data; wherein the second compensation parameter is used to adjust the first compensation parameter to a magnitude matching the hydrocarbon increase rate data; obtaining the reservoir gas-oil ratio according to the first compensation parameter, the second compensation parameter, the hydrocarbon increase rate data, and the gas-oil ratio compensation coefficient.

[0012] Optionally, the obtaining of the reservoir gas-oil ratio according to the first compensation parameter, the second compensation parameter, the hydrocarbon increase rate data, and the gas-oil ratio compensation coefficient comprises:

[0013] The reservoir gas-oil ratio is obtained according to a formula GOR=k*D+k*P*|Pr|, wherein GOR is the reservoir gas-oil ratio, D is the hydrocarbon enrichment data, P is the first compensation parameter, Pr is the second compensation parameter, and k is a gas-oil ratio compensation coefficient.

[0014] Optionally, if the hydrocarbon content data includes methane content data, ethane content data, and propane content data:

[0015] The first compensation parameter is The second compensation parameter is C1, C2, and C3 represent the contents of methane, ethane, and propane, respectively.

[0016] Optionally, if the hydrocarbon content data includes methane content data, ethane content data, propane content data, and butane content data:

[0017] The first compensation parameter is The second compensation parameter is C1, C2, C3, and C4 represent the contents of methane, ethane, propane, and butane, respectively.

[0018] Optionally, if the hydrocarbon content data includes methane content data, ethane content data, propane content data, butane content data, and pentane content data:

[0019] The first compensation parameter is The second compensation parameter is C1, C2, C3, C4, and C5 represent the contents of methane, ethane, propane, butane, and pentane, respectively.

[0020] Optionally, if the hydrocarbon content data only includes methane content data and ethane content data, the reservoir gas-oil ratio of the oil and gas reservoir is obtained according to the hydrocarbon enrichment data and a preset gas-oil ratio compensation coefficient, including:

[0021] First ratio data is obtained according to a ratio of the methane content data and the ethane content data, and a reservoir gas-oil ratio is obtained according to the first ratio data, hydrocarbon enrichment data, and a preset gas-oil ratio compensation coefficient, wherein the hydrocarbon enrichment data includes at least one of a component and a net enrichment rate and a total hydrocarbon net enrichment rate.

[0022] Optionally, the reservoir gas-oil ratio is obtained according to the first ratio data, the hydrocarbon enrichment data, and the preset gas-oil ratio compensation coefficient, including:

[0023] According to a formula GOR=k*D+k*P, the reservoir gas-oil ratio is obtained; wherein, GOR is the reservoir gas-oil ratio, D is the hydrocarbon increasing rate data, P is the first ratio data, and k is a gas-oil ratio compensation coefficient.

[0024] Optionally, if the hydrocarbon content data only includes methane content data, the reservoir gas-oil ratio of the oil and gas reservoir is obtained according to the hydrocarbon increasing rate data and a preset gas-oil ratio compensation coefficient, including:

[0025] The reservoir gas-oil ratio is obtained according to the product of the hydrocarbon increasing rate data and the gas-oil ratio compensation coefficient; wherein, the hydrocarbon increasing rate data includes at least one of a component and a net increasing rate and a total hydrocarbon net increasing rate.

[0026] The reservoir gas-oil ratio obtaining method based on the gas logging Pikesler ratio provided in the embodiment of the present application uses the hydrocarbon increasing rate data as the basic data, which is the data after removing the background value interference, and has high reliability; meanwhile, in combination with the preset gas-oil ratio compensation coefficient, the accurate reservoir gas-oil ratio can be obtained, and the value can accurately reflect the gas-oil ratio condition in the reservoir; and the fine processing under different hydrocarbon source conditions is realized in the data processing process.

[0027] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. In the drawings:

[0029] Figure 1 A flow chart of the gas logging oil and gas display layer gas parameter net increment obtaining method provided in the embodiment of the present application is shown;

[0030] Figure 2 A curve schematic diagram of the base value curve, the gas net content data and the hydrocarbon increasing rate data changing with the depth of the well section is shown;

[0031] Figure 3 A flow chart of the reservoir gas-oil ratio obtaining method based on the gas logging Pikesler ratio provided in the embodiment of the present application is shown;

[0032] Figure 4Fig. 1 shows a schematic diagram of the first ratio data, the second ratio data and the reservoir gas-oil ratio varying with the depth of the well section in an embodiment of the present application. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0034] Currently, in the data processing process of oil and gas exploration and development, the gas net content data, i.e., the total hydrocarbon net value data and / or the component and net value data, and the hydrocarbon increase rate data, i.e., the total hydrocarbon net increase rate and / or the component and net increase rate, are key parameters affecting the accuracy of the reservoir gas-oil ratio of the oil and gas reservoir. However, there is a lack of continuity in the process of obtaining the gas net content data and the hydrocarbon increase rate data, which cannot effectively reflect the relative changes of liquid oil and gaseous natural gas in the oil and gas enrichment layer in the vertical direction. In order to solve this problem, in an embodiment of the present application, a gas logging oil and gas display layer gas parameter net increment acquisition method and a reservoir gas-oil ratio acquisition method based on gas logging Pikesler ratio are provided, which will be described in detail below.

[0035] Referring to Figure 1 In an embodiment of the present application, a gas logging oil and gas display layer gas parameter net increment acquisition method is provided, which comprises:

[0036] Step S10: Obtain the lithology and hydrocarbon content data of the well section providing gaseous hydrocarbon; the hydrocarbon content data is the data obtained by measuring the drilling fluid;

[0037] Step S20: Determine the oil and gas reservoir in the drilling according to the lithology of the well section;

[0038] Step S30: Determine a plurality of base value points from the hydrocarbon content data according to the oil and gas reservoir; wherein the base value points are the background values of gaseous hydrocarbon of the oil and gas reservoir;

[0039] Step S40: Fit the plurality of base value points to obtain base value curve data;

[0040] Step S50: Obtain gas net content data according to the base value curve data and the hydrocarbon content data.

[0041] In the embodiment, the different well section lithologies are distinguished by steps S10-S50 to determine the oil and gas reservoirs, and the data corresponding to the oil and gas reservoirs are found in the hydrocarbon content data, so that the multiple base point data determined from the hydrocarbon content data can accurately represent the gaseous hydrocarbon background value of the oil and gas reservoirs; further, the base value curve data obtained by fitting the base point data can represent the continuous background value; finally, the gas net content data can be obtained by combining the hydrocarbon content data, which is continuous data and is accurate background value data with high accuracy, and the reliability of the reservoir gas oil ratio data is improved.

[0042] Step S10: obtaining the well section lithology and hydrocarbon content data of gaseous hydrocarbon; the hydrocarbon content data is the data obtained by measuring the drilling fluid.

[0043] In step S10, the gaseous hydrocarbon can include but is not limited to C1 (methane), C2 (ethane), C3 (propane), iC4 (isobutane), nC4 (n-butane), iC5 (isopentane) and nC5 (n-pentane); for convenience of description, C1, C2, C3, C4 and C5 are used to represent the content of methane, ethane, propane, butane and pentane respectively hereinafter. Therefore, the hydrocarbon content data used in the embodiment can be total hydrocarbon detection value, i.e. the detection data obtained by detecting all gaseous hydrocarbons; or component detection value, i.e. the detection data obtained by detecting methane, ethane, propane, butane and pentane; or two sets of results obtained by using total hydrocarbon detection value and component detection value respectively, and the final result is obtained by averaging, without limitation.

[0044] The hydrocarbon content data can be discrete data obtained by continuous measurement, or continuous curve data obtained by fitting after continuous measurement, without limitation. The hydrocarbon content data can be total hydrocarbon detection value and component detection data; the total hydrocarbon detection value is the sum of the measurement values of the diffusion gas, the permeation gas and the organic material pollution of the drilling fluid which mainly constitutes the total hydrocarbon. The component detection data is the sum of the measurement values of methane, ethane, propane, butane and pentane.

[0045] It should be noted that before obtaining the hydrocarbon content data, the data obtained by measuring the drilling fluid can also be subjected to interference identification. The interference data can be deleted or optimized, for example, the single peak of gas, the pump stop gas, the aftereffect gas after tripping, the drilling fluid additive pollution gas and the like are identified, the corresponding data points are deleted or smoothed or compensated to a reasonable interval according to the adjacent data, so that the gas generated in the drilling formation can be truly measured and displayed.

[0046] Step S20: determining the oil and gas reservoir in the drilling according to the well section lithology.

[0047] In step S20, the characteristics of the well section lithology and the characteristics of the oil and gas reservoirs can be different in different scenarios; for this, those skilled in the art can adaptively adjust the judgment criteria of the oil and gas reservoirs based on different application scenarios. For example, in the present embodiment, the well section lithology that can provide gaseous hydrocarbons can include sand shale lithology and special lithology.

[0048] For sand shale lithology, the sand shale profile contains sandstone, mudstone (shale), coal seam, etc. with hydrocarbon reservoir space, and the well section with mud content less than 50% in the sand shale lithology can be determined as an oil and gas reservoir; for special lithology, the special lithology can include limestone, metamorphic rock, igneous rock, etc., and the well section with porosity greater than the effective reservoir porosity in the special lithology can be determined as an oil and gas reservoir; for example, when the part of the well section with effective reservoir porosity PHIE < 0.025 v / v is determined as an oil and gas reservoir. Thus, the oil and gas reservoirs and non-oil and gas reservoirs can be separated from the well section lithology that provides gaseous hydrocarbons.

[0049] Further, due to the formation factors and drilling fluid composition factors as the drilling engineering construction proceeds, the gas logging total hydrocarbon value and component value gradually increase, and the curve gradually rises. The display peak appears on the basis of the higher base value (background value) (but the peak value cannot represent the true oil and gas abundance of the reservoir). Therefore, the base value needs to be obtained and removed. Specific analysis, the value of total hydrocarbon detection of gas logging is mainly determined by the formation gas content, and there are many influencing factors. For example, the influence of drilling fluid performance on gas logging value, including:

[0050] 1. The influence of drilling fluid column pressure on wellbore pressure balance;

[0051] 2. The influence of drilling fluid viscosity on the degassing efficiency of the degasser;

[0052] 3. The influence of drilling fluid oil mixing.

[0053] The influence of drilling engineering on gas logging includes the type of drill bit, the diameter of drill bit and drilling parameters; among them, the drilling parameters include the drilling pressure, the drilling speed and the displacement of drilling fluid.

[0054] Under the balanced drilling condition, the total hydrocarbon of the gas logging while drilling is composed of "crushing gas" released by rock crushing, "diffusion gas" diffused into the wellbore under the action of pressure difference, and "permeation gas" penetrated into the wellbore under the action of concentration difference. In the case of "crushing gas" domination, the total hydrocarbon value increases to form an oil and gas display peak curve under the joint action of crushing gas, diffusion gas and permeation gas, which plays a role in discovering oil and gas layers at the first time. The total hydrocarbon dominated by "diffusion gas" and "permeation gas" and the pollution of drilling fluid organic materials forms the total hydrocarbon base value, i.e. the background value.

[0055] Meanwhile, as the drilling engineering construction is carried out, under the ideal balanced drilling condition, the hydrocarbon gas from one oil and gas layer of the stratum causes the total hydrocarbon value and the component value of the gas logging to gradually increase, the curve gradually rises, and the display peak shape appears, continues with the increase of the depth, reaches the peak value, and then decreases to the base value. The gas logging display peak shape depends on the thickness of the oil and gas layer, the oil and gas abundance, the oil and gas properties, the gas oil ratio, and the reservoir homogeneity, etc. In view of this, in the embodiment, corresponding modes are provided for different well section lithologies to determine the background value of the gaseous hydrocarbon in the oil and gas reservoir, and the reliability of the background value of different types of lithologies is targetedly ensured. For details, please refer to the subsequent step S30.

[0056] Step S30: determining a plurality of base value points from the hydrocarbon content data according to the oil and gas reservoir; wherein the base value point is the background value of the gaseous hydrocarbon of the oil and gas reservoir.

[0057] In step S30, the target data in the hydrocarbon content data can be determined according to the oil and gas reservoir corresponding to the sand shale lithology and the non-oil and gas reservoir corresponding to the special lithology; and a plurality of trough values in the target data are determined as a plurality of base value points. Specifically, for the sand shale lithology, the hydrocarbon content data of the gas production well section is determined as the target data, the target data is a curve, and then the trough value in the target data is found, that is, the base value point. For the special lithology, the hydrocarbon content data corresponding to the non-oil and gas reservoir is determined as the target data, and the trough value in the target data is found, that is, the base value point; different lithologies correspond to different processing modes, and the fine processing is realized according to the characteristics of the lithology, thereby ensuring the reliability of the background value.

[0058] Step S40: fitting the plurality of base value points to obtain base value curve data.

[0059] In step S40, the plurality of extreme value points are fitted to obtain the continuous base value curve in each well section, so that the change trend of the background data can be conveniently observed, and the base value data of any point can be inquired, such as shown in Figure 2

[0060] Step S50: obtaining gas net content data according to the base value curve data and the hydrocarbon content data.

[0061] In step S50, when the gas net content data includes total hydrocarbon net value data, and the hydrocarbon content data includes total hydrocarbon detection value, the specific implementation of step S50 is: obtaining the total hydrocarbon net value data according to the difference between the total hydrocarbon detection value and the base value curve data, and the base value curve data at this time is obtained from the total hydrocarbon detection value. The total hydrocarbon net value data can be expressed by the formula: DTG = TG - TGBK; wherein, DTG is the total hydrocarbon net value data, %; TG is the total hydrocarbon detection value, %; and TGBK is the base value curve data, %. ​

[0062] Further, at this time, after step S50, it also includes: obtaining the net increase rate of total hydrocarbon according to the ratio of the total hydrocarbon net value data and the base value curve data. Specifically, the net increase rate of total hydrocarbon can be expressed as DTGA=DTG / TGBK;wherein, DTGA is the net increase rate of total hydrocarbon;DTG is the total hydrocarbon net value data, %;TGBK is the base value curve data, %.

[0063] In step S50, when the gas net content data includes component and net value data, and the hydrocarbon content data includes component detection value, the specific implementation of step S50 is: obtaining the component and net value data according to the difference between the component detection value and the base value curve data;wherein, the component detection value is the sum of the detection values of methane, ethane, propane, isobutane, n-butane, isopentane and n-pentane. At this time, the base value curve data is obtained from the component detection value. The component and net value data can be expressed as: DTC=TC-TCBK;wherein, DTC is the component and net value data, %;TCBK is the base value curve data, %;TC is the component detection value, %;TC=C1+C2+C3+C4+C5.

[0064] Further, at this time, after step S50, it also includes: obtaining the net increase rate of total hydrocarbon according to the ratio of the total hydrocarbon net value data and the base value curve data. Specifically, the net increase rate of total hydrocarbon can be expressed as DTGA=DTG / TGBK;wherein, DTGA is the net increase rate of total hydrocarbon;DTG is the total hydrocarbon net value data, %;TGBK is the base value curve data, %.

[0065] The gas parameter net increase amount acquisition method for gas logging oil and gas display layer provided in the embodiment is used to obtain continuous gas net content data and hydrocarbon increase rate data, which can be used to find the gas net content data and hydrocarbon increase rate data at any position. In the acquisition process, the measurement background value is accurately removed according to different well section lithology, so that the obtained gas net content data and hydrocarbon increase rate data are more stable and reliable, thereby ensuring the reliability of subsequent calculation of reservoir gas oil ratio.

[0066] Please refer to Figure 3 , based on the same inventive concept, in another embodiment of the present application, a reservoir gas oil ratio acquisition method based on gas logging Pikesler ratio is also provided, which uses the gas net content data or hydrocarbon increase rate data obtained in the foregoing embodiment for processing. Specifically, the reservoir gas oil ratio acquisition method based on gas logging Pikesler ratio includes:

[0067] Step S100: obtaining the well section lithology and hydrocarbon content data of gaseous hydrocarbon;The hydrocarbon content data is the data obtained by measuring drilling fluid;

[0068] Step S200: obtaining hydrocarbon increase rate data according to the well section lithology and hydrocarbon content data; the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate;

[0069] Step S300: obtaining reservoir gas-oil ratio of the oil and gas reservoir according to the hydrocarbon increase rate data and preset gas-oil ratio compensation coefficient.

[0070] In the embodiment, the hydrocarbon increase rate data is used as the basic data by steps S100-S300, which is the data after removing the background value interference, and has high reliability; meanwhile, the accurate reservoir gas-oil ratio can be obtained by combining the preset gas-oil ratio compensation coefficient, and the value can accurately reflect the gas-oil ratio in the reservoir. The following will be described and explained in detail for each step in the embodiment.

[0071] Step S100: obtaining well section lithology and hydrocarbon content data of gaseous hydrocarbon; the hydrocarbon content data is the data obtained by measuring drilling fluid; step S200: obtaining hydrocarbon increase rate data according to the well section lithology and hydrocarbon content data; the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate.

[0072] In the embodiment, the specific implementation of steps S100-S200 is the same as that in the gas logging oil and gas display layer gas parameter net increase amount obtaining method in the foregoing embodiment, and for brief description, the foregoing embodiment can be referred to for implementation, and the embodiment will not be described herein.

[0073] Step S300: obtaining reservoir gas-oil ratio of the oil and gas reservoir according to the hydrocarbon increase rate data and preset gas-oil ratio compensation coefficient.

[0074] In step S300, various cases can be implemented for fine processing. Specifically, the following cases can be implemented.

[0075] 1. If the hydrocarbon content data only includes methane content data.

[0076] At this time, step S300 includes: obtaining the reservoir gas-oil ratio according to the product of the hydrocarbon increase rate data and the gas-oil ratio compensation coefficient; wherein the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate. Specifically, the reservoir gas-oil ratio can be represented as GOR=k·D; wherein GOR is the reservoir gas-oil ratio, and D is the hydrocarbon increase rate data. The reservoir gas-oil ratio represented by k·D can be used as a basic gas-oil ratio data.

[0077] That is, in this case, only methane is contained, and the methane content is stable at this time, and there is no interference of other gases; therefore, the reservoir gas-oil ratio can be obtained by the product of the hydrocarbon increase rate data and the gas-oil ratio compensation coefficient, and good accuracy can be achieved.

[0078] It should be noted that, in the calculation, either the component and net increase rate and the total hydrocarbon net increase rate can be used to calculate the reservoir gas oil ratio; or, the component and net increase rate and the total hydrocarbon net increase rate are respectively used to obtain two reservoir gas oil ratios (a first reservoir gas oil ratio and a second reservoir gas oil ratio), and then the two reservoir gas oil ratios are averaged to obtain the final reservoir gas oil ratio, further improving the accuracy of the result. In addition, the gas oil ratio compensation coefficient can be determined by a plurality of measured data and through regression analysis or the like. The following various cases are also the same, and will not be described in detail.

[0079] 2. If the hydrocarbon content data only includes methane content data and ethane content data.

[0080] At this time, the step S300 specifically includes:

[0081] Step S301a: obtaining first ratio data according to the ratio of the methane content data and the ethane content data;

[0082] Step S302a: obtaining the reservoir gas oil ratio according to the first ratio data, the hydrocarbon increase rate data and a preset gas oil ratio compensation coefficient; wherein the hydrocarbon increase rate data includes at least one of the component and net increase rate and the total hydrocarbon net increase rate.

[0083] In the steps S301a-S302a, the ratio of the methane content data and the ethane content data can be represented as Further, in the data processing, the reservoir gas oil ratio can be obtained according to the formula GOR=k·D+k·P; wherein GOR is the reservoir gas oil ratio, D is the hydrocarbon increase rate data, P is the first ratio data, and k is the gas oil ratio compensation coefficient. At this time, the basic gas oil ratio data is corrected through the proportional relationship between the methane content and the ethane content, thereby introducing the influence of the proportion of methane and ethane on the reservoir gas oil ratio, and further improving the accuracy of the reservoir gas oil ratio.

[0084] 3. If the hydrocarbon content data includes light hydrocarbon data other than methane and ethane, for example, also includes propane, butane, pentane, etc.

[0085] At this time, the implementation process of the step S300 includes:

[0086] Step S301b: obtaining first ratio data and second ratio data between each component according to the component data of each component in the hydrocarbon content data; wherein the first ratio data is the ratio data of the methane content and the content of other components, and the second ratio data is the ratio data of the content of other components and the methane content.

[0087] Specifically, please refer to Figure 4The first ratio data can include a ratio of the methane content data to the ethane content data, which can be represented as P1 a ratio of the methane content data to the propane content data, which can be represented as P2 a ratio of the methane content data to the butane content data, which can be represented as P3 a ratio of the methane content data to the pentane content data, which can be represented as P4 The second ratio data can include a ratio of the ethane content data to the methane content data, which can be represented as P5 a ratio of the propane content data to the methane content data, which can be represented as P6 a ratio of the butane content data to the methane content data, which can be represented as P7 a ratio of the pentane content data to the methane content data, which can be represented as P8

[0088] Step S302b: obtaining the reservoir gas-oil ratio according to the first ratio data, the second ratio data, the hydrocarbon increase rate data, and a preset gas-oil ratio compensation coefficient; wherein the hydrocarbon increase rate data includes at least one of a component and a net increase rate and a total hydrocarbon net increase rate.

[0089] In step S302, since there are multiple hydrocarbons, the influence of each hydrocarbon needs to be considered to correct the basic gas-oil ratio data. The implementation manner in the embodiment is as follows:

[0090] First, a first compensation parameter is obtained according to the product of each first ratio data; since the first compensation parameter is determined by the content of each hydrocarbon source, the basic gas-oil ratio data can be corrected and compensated by the first compensation coefficient by comprehensively considering the influence of all hydrocarbon sources. However, in the first compensation coefficient, P2, P3, and P4 are often a large parameter due to the content of various light hydrocarbons, and if the first compensation coefficient is directly used to compensate the basic gas-oil ratio data, there may be a large error; therefore, the second compensation coefficient can be used to adjust the first compensation coefficient in the embodiment, so that the first compensation coefficient matches the hydrocarbon increase rate data.

[0091] The determination manner of the second compensation coefficient is as follows: a relative fluctuation data corresponding to each first target data is obtained according to the difference between each first target data and a second target data; wherein the first target data is a ratio data in the second ratio data except the second target data, and the second target data is a ratio of the ethane content data to the methane content data. Then, a second compensation parameter is obtained according to the product of each relative fluctuation data; wherein the second compensation parameter is used to adjust the first compensation parameter to a magnitude that matches the hydrocarbon increase rate data.

[0092] Specifically, the first target data is related to the type of hydrocarbon source, and can include and one or more of the first target data and the second target data Since the content of methane and ethane in each well section is relatively stable, it can be used as a base. Then, the difference between the first target data and the second target data can be used to obtain the fluctuation of the content of other hydrocarbons relative to methane and ethane. The difference is a small value, so the first compensation parameter can be adjusted to an optimal interval. Specifically, P4 can be adjusted by (P4R-P1R), P3 can be adjusted by (P3R-P1R), and P2 can be adjusted by (P2R-P1R).

[0093] Then, the reservoir gas-oil ratio is obtained according to the first compensation parameter, the second compensation parameter, the hydrocarbon increase rate data, and the gas-oil ratio compensation coefficient. Specifically, the reservoir gas-oil ratio can be obtained according to the formula GOR=k·D+k·P*|Pr|, where GOR is the reservoir gas-oil ratio, D is the hydrocarbon increase rate data, P is the first compensation parameter, Pr is the second compensation parameter, and k is the gas-oil ratio compensation coefficient. The method can obtain an accurate reservoir gas-oil ratio, which can be referred to as shown in Figure 4 Figure 4 As can be seen from the above, the reservoir gas-oil ratio obtained by the method can clearly and accurately reflect the reservoir conditions.

[0094] When the hydrocarbon content data includes methane, ethane, and propane, the reservoir gas-oil ratio can be represented as:

[0095]

[0096] When the hydrocarbon content data includes methane, ethane, propane, and butane, the reservoir gas-oil ratio can be represented as:

[0097]

[0098] When the hydrocarbon content data includes methane, ethane, propane, butane, and pentane, the reservoir gas-oil ratio can be represented as:

[0099]

[0100] It should be noted that the hydrocarbon increase rate data used in the present embodiment can be continuous data (curve), so that the reservoir gas-oil ratio is also a continuous curve, and the reservoir gas-oil ratio of any well section can be obtained. Therefore, it is more convenient to observe the change trend of the reservoir gas-oil ratio and find the oil and gas distribution characteristics.

[0101] ​The term "and / or", appearing herein, is used to describe a conjunctive relationship among associated objects, and means that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, or B exists alone. In addition, the character " / " appearing herein generally means that the associated objects before and after the " / " are in an "or" relationship; the word "comprise" does not exclude the existence of elements or steps not listed in the claims. The use of the words "first", "second", and "third", etc. does not indicate any order. These words can be interpreted as names.

[0102] Although preferred embodiments of the application have been described, those skilled in the art will be able to make additional modifications and variations to these embodiments without departing from the spirit and scope of the application. Accordingly, the appended claims are intended to encompass all such modifications and variations as falling within the scope of the application.

[0103] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for obtaining the reservoir gas-oil ratio based on the Pixler ratio of gas logging, characterized in that, include: Obtain lithology and hydrocarbon content data for the well section providing gaseous hydrocarbons; the hydrocarbon content data is obtained from drilling fluid measurements. Based on the lithology and hydrocarbon content data of the well section, hydrocarbon increase rate data is obtained; the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate; the component and net increase rate is: DTCA = DTC / TCBK; where DTCA is the component and net increase rate; DTC is the component and net value data; TCBK is the baseline curve data; the total hydrocarbon net increase rate is: DTGA = DTG / TGBK; where DTGA is the total hydrocarbon net increase rate; DTG is the total hydrocarbon net value data; TGBK is the baseline curve data; Based on the hydrocarbon increase rate data and the preset gas-oil ratio compensation coefficient, the reservoir gas-oil ratio of the oil and gas reservoir is obtained. If the hydrocarbon content data includes light hydrocarbon data other than methane and ethane, the step of obtaining the reservoir gas-oil ratio of the oil and gas reservoir based on the hydrocarbon increase rate data and the preset gas-oil ratio compensation coefficient includes: Based on the component data of each component in the hydrocarbon content data, a first ratio data and a second ratio data between each component are obtained; wherein, the first ratio data is the ratio data of methane content to the content of other components, and the second ratio data is the ratio data of the content of other components to the content of methane. The reservoir gas-oil ratio is obtained based on the first ratio data, the second ratio data, the hydrocarbon increase rate data, and the preset gas-oil ratio compensation coefficient; wherein, the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate; The step of obtaining the reservoir gas-oil ratio based on the first ratio data, the second ratio data, the hydrocarbon increase rate data, and the preset gas-oil ratio compensation coefficient includes: The first compensation parameter is obtained by multiplying the values ​​of each of the first ratios. Based on the difference between each first target data and the second target data, the relative fluctuation data corresponding to each first target data is obtained; wherein, the first target data is the ratio data other than the second target data in the second ratio data, and the second target data is the ratio of ethane content data to methane content data; A second compensation parameter is obtained based on the product of the relative fluctuation data; wherein the second compensation parameter is used to adjust the first compensation parameter to an order of magnitude that matches the hydrocarbon increase rate data; The reservoir gas-oil ratio is obtained based on the first compensation parameter, the second compensation parameter, the hydrocarbon increase rate data, and the gas-oil ratio compensation coefficient. The step of obtaining the reservoir gas-oil ratio based on the first compensation parameter, the second compensation parameter, the hydrocarbon increase rate data, and the gas-oil ratio compensation coefficient includes: The reservoir gas-oil ratio is obtained according to the formula GOR=k·D+k·P*|Pr|; where GOR is the reservoir gas-oil ratio, D is the hydrocarbon increase rate data, P is the first compensation parameter, Pr is the second compensation parameter, and k is the gas-oil ratio compensation coefficient.

2. The method according to claim 1, characterized in that, If the hydrocarbon content data includes methane content data, ethane content data, and propane content data: The first compensation parameter is The second compensation parameter is Wherein, C1, C2, and C3 represent the contents of methane, ethane, and propane, respectively.

3. The method according to claim 1, characterized in that, If the hydrocarbon content data includes methane content data, ethane content data, propane content data, and butane content data: The first compensation parameter is The second compensation parameter is Wherein, C1, C2, C3 and C4 represent the contents of methane, ethane, propane and butane, respectively.

4. The method according to claim 1, characterized in that, If the hydrocarbon content data includes methane content data, ethane content data, propane content data, butane content data, and pentane content data: The first compensation parameter is The second compensation parameter is Wherein, C1, C2, C3, C4 and C5 represent the contents of methane, ethane, propane, butane and pentane, respectively.

5. The method according to claim 1, characterized in that, If the hydrocarbon content data only includes methane and ethane content data, then obtaining the reservoir gas-oil ratio of the oil and gas reservoir based on the hydrocarbon increase rate data and a preset gas-oil ratio compensation coefficient includes: Based on the ratio of the methane content data to the ethane content data, a first ratio value is obtained; The reservoir gas-oil ratio is obtained based on the first ratio data, the hydrocarbon increase rate data, and the preset gas-oil ratio compensation coefficient; wherein the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate.

6. The method according to claim 5, characterized in that, The step of obtaining the reservoir gas-oil ratio based on the first ratio data, the hydrocarbon increase rate data, and the preset gas-oil ratio compensation coefficient includes: The reservoir gas-oil ratio is obtained according to the formula GOR=k·D+k·P; where GOR is the reservoir gas-oil ratio, D is the hydrocarbon increase rate data, P is the first ratio data, and k is the gas-oil ratio compensation coefficient.

7. The method according to claim 1, characterized in that, If the hydrocarbon content data only includes methane content data, obtaining the reservoir gas-oil ratio of the oil and gas reservoir based on the hydrocarbon increase rate data and a preset gas-oil ratio compensation coefficient includes: The reservoir gas-oil ratio is obtained by multiplying the hydrocarbon increase rate data and the gas-oil ratio compensation coefficient; wherein the hydrocarbon increase rate data includes at least one of component and net increase rate and total hydrocarbon net increase rate.

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