CN113611371A - Method for judging validity of light hydrocarbon parameters in associated crude oil of natural gas reservoir based on light hydrocarbon boiling point - Google Patents
Method for judging validity of light hydrocarbon parameters in associated crude oil of natural gas reservoir based on light hydrocarbon boiling point Download PDFInfo
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Abstract
The invention discloses a method for judging and identifying the effectiveness of light hydrocarbon parameters in associated crude oil of a natural gas reservoir based on the boiling point of light hydrocarbon. The method comprises the following steps: according to whether the difference T between the weighted average of the boiling points of the constituent denominator light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds in the natural gas associated oil light hydrocarbon parameters exceeds a critical value K, the following judgment model for judging whether the associated oil light hydrocarbon parameters can accurately represent the natural gas characteristics is constructed: if T is less than or equal to K, the light hydrocarbon parameters of the associated oil of the natural gas are basically not influenced by the evaporation and fractionation effect, and the parameter values of the associated oil can effectively represent the geochemical characteristics of the natural gas; if T is larger than K, the light hydrocarbon parameters of the natural gas associated oil are obviously influenced by the evaporation and fractionation, and the characteristic of the natural gas can generate larger errors when the parameter values of the associated oil are used for judging the characteristics of the natural gas. The method can improve the accuracy of identifying the natural gas cause and maturity by using the light hydrocarbon parameters of the associated oil, and has wide applicability.
Description
Technical Field
The invention relates to a method for judging and identifying the effectiveness of light hydrocarbon parameters in associated crude oil of a natural gas reservoir based on the boiling point of light hydrocarbon, belonging to the field of research on natural gas cause.
Background
Light hydrocarbon (C)1-C10) Is an important component of crude oil and natural gas, and is widely applied to the research on secondary effects of oil gas cause types, maturity, evaporation and fractionation and the like. Evaporative fractionation refers primarily to the process of separating crude oil from natural gas. In many oil and gas fields at home and abroad, natural gas is often produced along with light oil and condensate oil. In the research process of natural gas cause, the absolute content of light hydrocarbon of the accompanying oil is high and is easy to detect, and light hydrocarbon parameters of the accompanying oil are often used for judging the natural gas cause. However, the judgment criteria of the cause type and maturity of the natural gas are established based on the research of natural gas samples, and whether the light hydrocarbon parameters of the associated oil can accurately represent the light hydrocarbon characteristics of the natural gas needs to be further discussed. In other words, after the influence of the evaporation fractionation, which light hydrocarbon parameters of the associated oil are basically not influenced, and the cause type and maturity of the natural gas can be still determined, which is a lack of determination method. The boiling point of the compound is an important factor influencing the evaporation fractionation, and the difference of the boiling points of the compounds forming the light hydrocarbon group is considered to be large, and the parameter is influenced by the evaporation fractionation obviously. The light hydrocarbon parameters generally consist of ratios of abundances of various compounds, and the boiling point differences of different light hydrocarbon compounds are obvious and difficult to easily judge, so that a quantitative standard for judging whether the light hydrocarbon parameters are influenced by evaporation fractionation needs to be provided to improve the reliability of judging the cause type and maturity of natural gas by using the associated oil light hydrocarbon parameters.
Disclosure of Invention
The invention aims to provide a method for judging the effectiveness of light hydrocarbon parameters in associated crude oil of a natural gas reservoir at the boiling point of light hydrocarbon, which is used for the research of judging the cause type and maturity of natural gas by the light hydrocarbon parameters of associated oil.
At present, the light hydrocarbon parameters of the associated oil are often applied to judgment of the cause and maturity of the natural gas, and the judgment standard of the cause and maturity of the natural gas is established based on statistics of natural gas samples and is influenced by evaporation fractionation, so that the light hydrocarbon parameters of the associated oil and the light hydrocarbon parameters of the natural gas have certain difference. Therefore, it is necessary to establish an identification method for determining whether the light hydrocarbon parameters are significantly affected by the evaporation fractionation before application. The evaporation fractionation is mainly controlled by the boiling point, and in addition, the abundance of the compound is also an important factor for controlling the strength of the influence of the evaporation fractionation. Based on the above knowledge, the present invention establishes a judgment model using the abundance ratio of each compound in the satellite oil as a weight and using the difference between the weighted average boiling points of the constituent numerator and denominator compounds as a standard.
The method for judging and identifying the effectiveness of the light hydrocarbon parameters in the associated crude oil of the natural gas reservoir based on the boiling point of the light hydrocarbon comprises the following steps:
according to whether the difference T between the weighted average of the boiling points of the constituent denominator light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds in the natural gas associated oil light hydrocarbon parameters exceeds a critical value K, the following judgment model for judging whether the associated oil light hydrocarbon parameters can accurately represent the natural gas characteristics is constructed:
if T is less than or equal to K, the light hydrocarbon parameters of the natural gas associated oil are basically not influenced by the evaporation and fractionation effect, and the parameter values of the associated oil can effectively represent the geochemical characteristics of the natural gas;
if T is larger than K, the light hydrocarbon parameters of the natural gas associated oil are obviously influenced by the evaporation and fractionation action, and the characteristic of the natural gas is judged to generate larger errors by using the parameter values of the associated oil.
In the above method, the light hydrocarbon parameter of the natural gas associated oil is obtained by formula (1):
in the formula, A1，A2，A3……AmRepresenting the abundance of constituent light hydrocarbon parameter denominator compounds in the associated oilM represents the number of compounds constituting the denominator in the parameter; b is1，B2，B3……BnRepresents the abundance of the compounds constituting the light hydrocarbon parameter molecules in the accompanying oil, and n represents the number of the compounds constituting the molecules in the parameter.
In the above process, the difference T between the weighted average of the boiling points of the constituent dyadic light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds is obtained according to formula (2):
wherein T represents the difference in degree centigrade between the constituent denominator and the weighted average boiling point of the molecular compound; a isiAnd biRespectively represent the weight of each compound constituting the denominator and the numerator of the light hydrocarbon parameter, and a1+a2+a3+……+am＝1，b1+b2+b3+……+bn＝1；XiAnd YkRespectively represent constituent light hydrocarbon parameter denominator compound AiAnd molecular compound BkThe boiling point of (c).
Specifically, the weight of each compound constituting the denominator of the light hydrocarbon parameter is obtained according to the formula (2-1):
wherein i is 1,2,3 … … m; a. the1，A2，A3……AmRepresenting the abundance of constituent light hydrocarbon parameter denominator compounds in the satellite oil; m represents the number of compounds constituting the denominator in the parameter;
the weights of the compounds constituting the light hydrocarbon parameter molecules are obtained according to the formula (2-2):
wherein k is 1,2,3 … … m; b is1，B2，B3……BnRepresents the abundance of the compounds constituting the light hydrocarbon parameter molecules in the accompanying oil, and n represents the number of the compounds constituting the molecules in the parameter.
In the method, the light hydrocarbon parameter D is different according to a series of composition parameters of the natural gas and the associated oil, namely the boiling point difference between a denominator and a molecular compoundgAnd DoNormalized value D ofg' and Do' comparing one by one, determining the critical value K (DEG C):
selecting a series of light hydrocarbon ratio parameters D (such as iC) with similar structure and different boiling point difference4/nC4、2-MC5/nC6、2-MC6/nC7、iC5/nC5、3-MC6/nC7、3-MC5/nC6、1,1-DMCyC5/1,t2-DMCyC5、2-MC5/3-MC5、2-MC6/3-MC6、1,c3-/1,t2-DMCyC5The difference between the boiling points of the denominator and the molecular compound of the ratios is 11.5 ℃, 8.7 ℃, 8.5 ℃, 8.1 ℃, 6.5 ℃, 5.7 ℃, 4.4 ℃, 3.0 ℃, 2.0 ℃ and 1.1 ℃); then selecting parameters D one by one according to the boiling point difference from large to small, and respectively obtaining light hydrocarbon parameter values D of representative natural gas and associated oil samplesgAnd DoNormalized calculation is carried out to obtain Dg' and Do’：
If D isg’-Do' < 0.1, the boiling point difference between the parent compound and the molecular compound of the selected parameter is defined as the critical value K.
The symbols and boiling points of the light hydrocarbon compounds are shown in table 1.
TABLE 1 crude oil and NaturalCommonly used in qi4-C7Light hydrocarbon compound and boiling point thereof
The invention provides a feasible technical method for judging whether the light hydrocarbon parameters are influenced by the evaporation fractionation effect or not and whether the light hydrocarbon parameters in associated crude oil of the natural gas reservoir can effectively represent the geochemical characteristics of the natural gas or not, can improve the accuracy of judging the natural gas cause and maturity by using the light hydrocarbon parameters of the associated oil, and has wide applicability.
Drawings
Fig. 1 is a flow chart of the method for identifying the effectiveness of light hydrocarbon parameters in associated crude oil of a natural gas reservoir based on the boiling point of light hydrocarbon according to the present invention.
FIG. 2 is a graphical representation of the relationship between critical value K (deg.C) determined using a comparison of sample parameters for representative natural gas and associated crude oil in accordance with an embodiment of the present invention.
Figure 3 is a comparison of multiwell natural gas and associated oil cyclohexane indices in accordance with an embodiment of the present invention.
Fig. 4 is a comparison of parameters of multiple light hydrocarbons of natural gas and its associated oil in accordance with an embodiment of the present invention.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The invention provides a method for judging and identifying the effectiveness of light hydrocarbon parameters in associated crude oil of a natural gas reservoir based on the boiling point of light hydrocarbon, the flow is shown as figure 1, and the method comprises the following steps:
step 101: and constructing an identification model for judging whether the accompanied oil light hydrocarbon parameters can accurately represent the characteristics of the natural gas according to whether the difference T (DEG C) between weighted averages of the boiling points of the denominator and the molecular light hydrocarbon compounds in the natural gas accompanied oil light hydrocarbon parameters exceeds a critical value K (DEG C). If T is less than or equal to K, the parameter P is basically not influenced by the evaporation fractionation effect, and the parameter value of the associated oil can effectively represent the geochemical characteristics of the natural gas; if T is more than K, the parameter P is obviously influenced by the evaporation fractionation, and the parameter value of the associated oil is used for judging the natural gas cause and maturity, so that a large error is generated.
Step 102: determining the weight a of each compound forming the light hydrocarbon parameter denominator in the model according to the abundance of the light hydrocarbon compounds in the associated oiliAnd the weights b of the compounds constituting the light hydrocarbon parameter moleculesi。
Step 103: according to the boiling point of each light hydrocarbon compound and the weight a of each compound forming light hydrocarbon parameter denominator and numeratoriAnd biAnd determining the difference T (DEG C) between the weighted averages of the boiling points of the constituent denominators and molecular light hydrocarbon compounds in the model.
Step 104: selecting a series of light hydrocarbon parameters D with different constituent parameter denominators and molecular boiling point differences, and respectively calculating light hydrocarbon parameter values D of representative natural gas and associated oil samplesgAnd DoAnd carrying out normalized calculation to obtain Dg' and Do', by Dg' and Do' comparison, determine the critical value K (. degree. C.) in the model.
According to the method provided by the invention, an identification model for judging whether the parameters of the light dydrocarbon of the associated oil can accurately represent the characteristics of the natural gas is constructed according to whether the difference T (DEG C) of the weighted average values of the boiling points of the formed denominator and the molecular light dydrocarbon compounds in the parameters of the light dydrocarbon of the natural gas associated oil exceeds the critical value K (DEG C): if T is less than or equal to K, the parameter P is basically not influenced by the evaporation fractionation effect, and the parameter value of the associated oil can effectively represent the geochemical characteristics of the natural gas; if T is more than K, the parameter P is obviously influenced by the evaporation fractionation, and the parameter value of the associated oil is used for judging the natural gas cause and maturity, so that a large error is generated.
Determining the weight a of each compound forming the light hydrocarbon parameter denominator in the model according to the abundance of the light hydrocarbon compounds in the associated oiliAnd compounds constituting light hydrocarbon parameter moleculesWeight of bi. Further, the weight a of each compound is determined according to the boiling point of each light hydrocarbon compound, the parameter denominator of the light hydrocarbon and the weight of each compound of the numeratoriAnd biDetermining the difference T (DEG C) between weighted averages of boiling points of constituent denominators and molecular light hydrocarbon compounds in the model; specifically, a series of light hydrocarbon parameters D with different constituent parameter denominators and molecular boiling point differences are selected, and light hydrocarbon parameter values D of representative natural gas and associated oil samples are respectively calculatedgAnd DoAnd carrying out normalized calculation to obtain Dg' and Do', by Dg' and Do' comparison, determine the critical value K (. degree. C.) in the model.
In one embodiment, a light hydrocarbon geochemical parameter is set as:
wherein A is1，A2，A3……AmThe abundance of the compounds forming the light hydrocarbon parameters of the denominator in the satellite oil, and m is the number of the compounds forming the denominator in the parameters; b is1，B2，B3……BnThe abundance of the compounds constituting the light hydrocarbon parameter molecules in the satellite oil, and n is the number of the compounds constituting the molecules in the parameter.
The calculation model of the difference between the weighted average of the boiling points of the constituent denominator light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds in the associated oil light hydrocarbon parameters is:
wherein T (DEG C) is the difference between the constituent denominator and the boiling point weighted average of the molecular compound; a isiAnd biRespectively the weight of each compound constituting the denominator and the numerator of the light hydrocarbon parameter, and a1+a2+a3+……+am＝1，b1+b2+b3+……+bn＝1；XiAnd YkRespectively is a constituent light hydrocarbon parameter denominator compound AiAnd molecular compound BkThe boiling point of (c).
If T is less than or equal to K, wherein K is a critical value, the parameter P is basically not influenced by the evaporation fractionation effect, and the parameter value of the associated oil can effectively represent the geochemical characteristics of the natural gas; if T is larger than K, the parameter P is obviously influenced by the evaporation fractionation, and a large error is generated when the parameter value of the associated oil is used for judging the characteristics of the natural gas.
In one embodiment, the calculation formula for calculating the weight of each compound that makes up the denominator of the light hydrocarbon parameter is:
wherein i is 1,2,3 … … m; a. the1，A2，A3……AmThe abundance of the denominator compound forming light hydrocarbon parameters in the associated oil; m is the number of compounds constituting the denominator in the parameter.
In one embodiment, the formula for calculating the weight of each compound making up a light hydrocarbon parameter molecule is:
wherein k is 1,2,3 … … m; b is1，B2，B3……BnThe abundance of the compounds constituting the light hydrocarbon parameter molecules in the satellite oil, and n is the number of the compounds constituting the molecules in the parameter.
In one embodiment, a series of light hydrocarbon parameters D are selected that constitute a single compound for both the denominator and the numerator, and that differ in boiling point between the denominator and the numerator: iC4/nC4、2-MC5/nC6、2-MC6/nC7、iC5/nC5、3-MC6/nC7、3-MC5/nC6、1,1-DMCyC5/1,t2-DMCyC5、2-MC5/3-MC5、2-MC6/3-MC6、1,c3-/1,t2-DMCyC5The difference between the boiling points of the parent and the molecular compounds in the ratio is 11.5 ℃, 8.7 ℃, 8.5 ℃, 8.1 ℃, 6.5 ℃, 5.7 ℃, 4.4 ℃, 3.0 ℃, 2.0 ℃ and 1.1 ℃ respectively. And selecting the parameter D one by one according to the boiling point difference from large to small. And calculating the light hydrocarbon parameter values D of the representative natural gas and the associated oil samples respectivelygAnd DoNormalized calculation is carried out to obtain Dg' and Do’：
If D isg'-Do' < 0.1, the boiling point difference between the denominator and the numerator of the selected parameter D is the critical value K (DEG C) in the model.
In this embodiment, the natural gas and associated oil in the sichuan basin are used as objects to be studied, and a method for determining the validity of light hydrocarbon parameters in associated crude oil of a natural gas reservoir based on the boiling point of light hydrocarbon is provided, which specifically comprises the following steps:
1. establishing an identification model for judging whether parameters of the light hydrocarbon of the associated oil can accurately represent the characteristics of the natural gas
The light hydrocarbon parameters are generally ratio parameters formed by the abundances of a plurality of light hydrocarbon compounds, such as cyclohexane index CH (%):
wherein CyC6Is cyclohexane, nC6Is n-hexane, MCyC5Is methyl cyclopentane; the calculation model of the difference between the weighted average of the boiling points of the constituent denominator light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds in the associated oil light hydrocarbon parameters is:
T＝b1X1-(a1Y1+a2Y2+a3Y3)
wherein T (DEG C) is the difference between the constituent denominator and the boiling point weighted average of the molecular compound; b1Is associated with CyC in oil6The abundance of (a) accounts for a proportion of the abundance of the constituent molecular compounds; a is1，a2，a3Respectively accompany nC in oil6，CyC6，MCyC5The abundance of (a) accounts for a proportion of the abundance of the constituent denominator compounds; x1Is CyC6Boiling point and Y of1，Y2，Y3Are each nC6，CyC6，MCyC5The boiling point of (c).
If T is less than or equal to K, wherein K is a critical value, CH (%) is basically not influenced by evaporation fractionation, and the parameter value of the associated oil can well represent the geochemical characteristics of the natural gas; if T is more than K, the CH (%) is obviously influenced by evaporation fractionation, and the judgment of the natural gas characteristics by using the parameter value of the associated oil can generate larger error.
2. Determining the weight a of each compound constituting the denominator of the light hydrocarbon parameters in the modeliAnd the weights b of the compounds constituting the light hydrocarbon parameter moleculesi
Taking a representative well Qiu8 natural gas associated oil sample as an example, the abundance of each compound can be obtained based on full-oil gas chromatography experimental analysis, so as to calculate the weight of each compound composing the light hydrocarbon parameter denominator:
calculating the weight of each compound forming light hydrocarbon parameter molecules:
3. determining the difference T (DEG C) between the weighted averages of boiling points of the constituent denominator and molecular light hydrocarbon compounds in the model
Taking a sample representing the natural gas associated oil of the well Qiu8 as an example, the weight a of each compound composing the light hydrocarbon parameter denominator is giveniAnd the weights b of the compounds constituting the light hydrocarbon parameter moleculesiAnd substituting the boiling points of the compounds obtained by table lookup into a calculation model for forming the difference between the weighted average of the boiling points of the denominator light hydrocarbon compounds and the weighted average of the boiling points of the molecular light hydrocarbon compounds, and calculating T (DEG C):
T＝1.0×80.8-(0.27×68.7+0.56×80.8+0.17×71.83)＝4.797(℃)
4. determination of threshold value K (. degree. C.) in the model
Taking a representative well Qiu8 natural gas and its associated oil sample as an example, a series of light hydrocarbon parameters D are selected, the denominator and the numerator of which are single compounds and the boiling point difference between the denominator and the numerator is different: iC4/nC4、2-MC5/nC6、2-MC6/nC7、iC5/nC5、3-MC6/nC7、3-MC5/nC6、1,1-DMCyC5/1,t2-DMCyC5、2-MC5/3-MC5、2-MC6/3-MC6、1,c3-/1,t2-DMCyC5The difference between the boiling points of the parent and the molecular compounds in the ratio is 11.5 ℃, 8.7 ℃, 8.5 ℃, 8.1 ℃, 6.5 ℃, 5.7 ℃, 4.4 ℃, 3.0 ℃, 2.0 ℃ and 1.1 ℃ respectively. And selecting the parameter D one by one according to the boiling point difference from large to small. Calculating the light hydrocarbon parameter values D of representative natural gas and associated oil samples respectivelygAnd DoNormalized calculation is carried out to obtain Dg' and Do' (Table 2) and compare Dg' and Do' size (fig. 2).
TABLE 2 comparison of values of parameters for light hydrocarbon of different molecular boiling points for Qiu8 well natural gas and its associated oil component mother stock
The greater the difference between the boiling point of the denominator and the boiling point of the numerator, the greater the difference between the values of the natural gas and associated oil parameters (fig. 2). When the difference between the boiling points of the denominator and the molecule is 3.00 ℃, Dg'-Do'. ltoreq.0.1, so that K in the model is 3 ℃. Obviously, T in the model>K, so CH (%) is greatly affected by evaporative fractionation, with the oil CH (%) not being an effective indicator of natural gas origin.
Studies have shown that CH (%) greater than 29% is coal-formed gas, while CH (%) less than 29% is oil-formed gas. The same blocks JH5, GongH16 and Gong108X are selected for well samples, the difference of CH (%) parameter values of natural gas and the associated oil is obvious and reaches 8.1-12.1% (figure 3), and the judgment of natural gas causes by using the CH (%) value of the associated oil causes larger errors, which is consistent with the judgment result by using the model.
5. Verification of the validity of the identification model
Samples of coal gas and associated condensate oil from Musculus cerasus Hemsl in JH5 and Qiu8 wells in Jinhua oil fields in Sichuan basin, and oil gas and associated light oil from Jurasia in GongH16 and Gong108X wells in Gongshan temple are selected as test examples. Selecting the parameter of methylcyclohexane index (MCH/%) and the Mango light hydrocarbon parameter K commonly used for judging the cause of natural gas1And the iso-and normal-cetane numbers (I, H/%) commonly used in natural gas maturity determination as research parameters, wherein:
the above identification model calculates the difference T (deg.c) between the denominators formed by different light hydrocarbon parameters of different samples and the weighted average of the boiling points of the molecular light hydrocarbon compounds, and the calculation results are shown in table 3. Comparing T (DEG C) with an application critical value K (DEG C), and obtaining the MCH index (MCH/%), and the light hydrocarbon parameter K of Mango1And the isoheptane number (I) T<K, the influence of evaporation and fractionation on the natural gas is small, and the natural gas characteristics can be effectively identified by applying the light hydrocarbon parameters of the associated oil; and T is the value of the n-heptane value (H/%)>K shows that the parameter is greatly influenced by evaporation fractionation, and the normal-heptane value (H/%) of the associated oil cannot accurately judge the maturity of the natural gas.
TABLE 3 comparison of K (. degree. C.) versus T (. degree. C.) parameters for representative companion oil samples
MCH (%) calculated by actually measured light hydrocarbon abundance of natural gas and associated oil, K1Comparison of values of I, H (%) parameters revealed MCH (%) for natural gas and associated oil, K1And the I parameters are not very different, and compared with the reported empirical values of the parameters for judging the cause or maturity of the natural gas, the conclusion is not influenced by judging the characteristics of the natural gas by using the parameters of the associated oil (figure 4). The natural gas and the companion oil have larger difference in the cetane number H (%), and the identification of the maturity of the natural gas by using the cetane number of the companion oil can make the identification maturity higher. Therefore, the actual measurement result is consistent with the result judged by the judgment model, and the effectiveness of the method is verified. The method solves the problem that due to the influence of evaporation fractionation, the great error possibly exists in the judgment and identification of the natural gas origin and maturity by using the associated oil light hydrocarbon parameters. The judgment model can improve the accuracy of natural gas cause and maturity judgment, has higher precision and wide applicability, and provides important technical support for the current natural gas source research.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for judging and identifying the effectiveness of light hydrocarbon parameters in associated crude oil of a natural gas reservoir based on the boiling point of light hydrocarbon comprises the following steps:
according to whether the difference T between the weighted average of the boiling points of the constituent denominator light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds in the natural gas associated oil light hydrocarbon parameters exceeds a critical value K, the following judgment model for judging whether the associated oil light hydrocarbon parameters can accurately represent the natural gas characteristics is constructed:
if T is less than or equal to K, the light hydrocarbon parameters of the natural gas associated oil are basically not influenced by the evaporation and fractionation effect, and the parameter values of the associated oil can effectively represent the geochemical characteristics of the natural gas;
if T is larger than K, the light hydrocarbon parameters of the natural gas associated oil are obviously influenced by the evaporation and fractionation action, and the characteristic of the natural gas is judged to generate larger errors by using the parameter values of the associated oil.
2. The method of claim 1, wherein: the natural gas associated oil light hydrocarbon parameters are obtained by a formula (1):
in the formula, A1，A2，A3……AmRepresenting the abundance of the compounds forming the light hydrocarbon parameters denominator in the associated oil, and m represents the number of the compounds forming the denominator in the parameters; b is1，B2，B3……BnRepresents the abundance of the compounds constituting the light hydrocarbon parameter molecules in the accompanying oil, and n represents the number of the compounds constituting the molecules in the parameter.
3. The method according to claim 1 or 2, characterized in that: obtaining the difference T between the weighted average of the boiling points of the constituent denominator light hydrocarbon compounds and the weighted average of the boiling points of the constituent molecular light hydrocarbon compounds according to formula (2):
wherein T represents the difference in degree centigrade between the constituent denominator and the weighted average boiling point of the molecular compound; a isiAnd biRespectively represent the weight of each compound constituting the denominator and the numerator of the light hydrocarbon parameter, and a1+a2+a3+……+am＝1，b1+b2+b3+……+bn＝1；XiAnd YkRespectively represent constituent light hydrocarbon parameter denominator compound AiAnd molecular compound BkThe boiling point of (c).
4. The method of claim 3, wherein: obtaining the weight of each compound forming the denominator of the light hydrocarbon parameter according to the formula (2-1):
wherein i is 1,2,3 … … m; a. the1，A2，A3……AmRepresenting the abundance of constituent light hydrocarbon parameter denominator compounds in the satellite oil; m represents the number of compounds constituting the denominator in the parameter;
the weights of the compounds constituting the light hydrocarbon parameter molecules are obtained according to the formula (2-2):
wherein k is 1,2,3 … … m; b is1，B2，B3……BnRepresenting the group in the companion oilThe abundance of the compounds forming the light hydrocarbon parameter molecules, and n represents the number of the compounds forming the molecules in the parameter.
5. The method according to any one of claims 1-4, wherein: the critical value K is determined in the following manner, in ° c:
selecting a series of light hydrocarbon ratio parameters D, wherein the parent compounds and the molecular compounds are single compounds, and the compounds have similar structures and different boiling point differences; then selecting parameters D one by one according to the boiling point difference from large to small, and respectively obtaining light hydrocarbon parameter values D of representative natural gas and associated oil samplesgAnd DoNormalized calculation is carried out to obtain Dg' and Do’：
If D isg’-Do' < 0.1, the boiling point difference between the parent compound and the molecular compound of the selected parameter is defined as the critical value K.
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