CN109212161A - A kind of method of determining shale gas reservoir adsorbed gas content - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000004927 clay Substances 0.000 claims abstract description 105
- 238000001179 sorption measurement Methods 0.000 claims abstract description 97
- 239000005416 organic matter Substances 0.000 claims abstract description 87
- 239000002734 clay mineral Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
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- 239000011148 porous material Substances 0.000 claims description 12
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- 239000007789 gas Substances 0.000 description 88
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
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- 239000011435 rock Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 229910052900 illite Inorganic materials 0.000 description 1
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- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
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Abstract
Disclose a kind of method of determining shale gas reservoir content.Method includes the following steps: 1) determine T0At a temperature of the shale gas reservoir content of organic matter and maturity and T0At a temperature of shale gas Clay Mineral component relative amount, clay mineral total content, clay hole irreducible water saturation；2) organic matter isothermal adsorption constant is determined；3) damp clay isothermal adsorption constant is determined；4) organic matter adsorbed gas content and damp clay adsorbed gas content are determined respectively；5) shale gas reservoir adsorbed gas total content is determined based on the organic matter adsorbed gas content and damp clay adsorbed gas content.The present invention is determines that shale gas reservoir adsorbed gas content provides effective means using well-log information, key parameter in this method can be obtained according to well-log information, with stronger operability and reliability, and shale reservoir adsorbed gas content logging evaluation precision is effectively increased, there is great practical value in shale gas exploration and development.
Description
Technical Field
The invention relates to the field of unconventional oil and gas exploration and development, in particular to a method for determining the content of adsorbed gas in a shale gas reservoir.
Background
The existence of natural gas in an adsorption state is a fundamental characteristic of shale gas reservoirs as distinguished from conventional oil and gas reservoirs. The accurate evaluation of the shale adsorbed gas content according to the logging information is an important basis for the exploration and development refinement of shale gas and is also a core problem of unconventional oil and gas reservoir evaluation. The accurate evaluation of the shale adsorbed gas content is of great importance for accurately knowing the potential of the reservoir resources.
At present, quantitative evaluation of shale adsorbed gas content is carried out, mainly by referring to a coal bed gas isothermal adsorption method, firstly, an isothermal adsorption characteristic curve of a shale core is determined by an experimental method, and on the basis, continuous evaluation of the adsorbed gas content of the whole well section is carried out by logging information. Liwu et al (Liwu, Yangyuan, Xujing, etc.. the shale adsorbed gas content considering the formation temperature and pressure calculates a new model [ J ]. Natural gas geoscience, 2012, 23 (4): 791-796) according to the isothermal adsorption experimental data of a small number (4) of cores, and a relational expression of Langmuir isothermal adsorption volume of shale and the organic matter content, maturity, reservoir temperature and pressure of a reservoir is established through data fitting. Chen Lei et al (Chen Lei, Heng Jiang Zheng, Jinyan, etc. Wen-xi depressed new page HF-1 well requires five sections of main control factors of the gas content absorbed by shale and a quantitative prediction model [ J ] modern geology, 2014, 28(4):824 and 831) are based on isothermal adsorption experiment data of the shale rock core, SPSS software is used for carrying out main component analysis on several influence factors of the gas content absorbed, the specific surface area, the humidity and the pressure are determined to be main factors influencing the gas content absorbed, and a new shale gas content absorbed calculation model considering the 3 main control factors is established. The two methods are used for establishing the main control factors of the adsorption gas and the calculation model thereof only from the data fitting/mathematical statistics angle analysis, the calculation precision is limited by the experimental data quantity, the physical significance of the calculation model is not clear, and the evaluation reliability is low. Zengxin and the like (Zengxin, Sunshenjian Meng, Chihongzhu, variable isothermal shale adsorption gas volume calculation model [ J ] logging technology, 2011, 38(3):287 and 291) combine with the analysis of isothermal adsorption data at different temperatures of a laboratory to consider that the total organic matter content is a main factor restricting the shale adsorption capacity, the influence degree of the temperature on the shale adsorption is almost the same under different pressures, the influence of clay minerals on the shale adsorption is small, and accordingly, a shale adsorption gas quantitative calculation model without considering the clay adsorption is constructed. The calculation model does not fully know the influence of the clay minerals on the shale adsorption capacity, splits the clay bound water and the clay minerals into two independent influence factors, neglects the influence of the clay mineral adsorption capacity and the bound water on the clay adsorption capacity, cannot accurately reflect the shale adsorbed gas occurrence mechanism, and has low reliability.
Therefore, a shale gas adsorption occurrence mechanism is necessary to be taken as a basic starting point, a shale gas adsorption content quantitative evaluation model which has clear physical significance and comprehensively reflects organic matters, clay adsorption capacity and influence factors thereof is established, and evaluation accuracy of shale gas reservoir gas adsorption content is improved.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
Aiming at the problems that the existing shale gas adsorption content evaluation method is unclear in physical significance, fails to fully consider the clay mineral adsorption capacity and is low in reliability, the invention establishes a novel shale gas reservoir gas adsorption content evaluation method.
The method for determining the content of the shale gas reservoir adsorbed gas can comprise the following steps:
1) determining T based on logging data and shale core experimental data0Shale gas reservoir organic matter content and maturity at temperature, and T0Relative content of clay mineral components, total clay mineral content and clay pore bound water saturation of the shale gas reservoir at the temperature;
2) determining the isothermal adsorption constant of the organic matter based on the change rule of the isothermal adsorption constant of the organic matter along with the content, maturity and temperature of the organic matter;
3) determining the isothermal adsorption constant of the wet clay based on the change rule of the isothermal adsorption constant of the clay mineral along with the relative content of clay components, the total content of the clay minerals, the saturation of clay pore bound water and the temperature;
4) respectively determining the content of organic adsorption gas and the content of wet clay adsorption gas based on the organic isothermal adsorption constant and the wet clay isothermal adsorption constant;
5) and determining the total content of the shale gas reservoir adsorbed gas based on the organic matter adsorbed gas content and the wet clay adsorbed gas content.
Preferably, the organic matter isothermal adsorption constant comprises a langmuir volume and a langmuir pressure of the organic matter, and the organic matter adsorption gas content is calculated by the following formula:
wherein,the content of organic adsorption gas under the temperature T and the pressure p,is the langmuir volume of organic matter at temperature T,is the langmuir pressure of the organic matter at temperature T.
Preferably, the langmuir volume and langmuir pressure of organic matter at the T temperature are calculated by:
a) based on T0Calculating the content and maturity of organic matters in the shale gas reservoir at the temperature, and calculating the T0Langmuir volume and langmuir pressure of organic matter at temperature;
b) obtaining a relation between the Langmuir volume of the organic matter and Langmuir pressure along with temperature change according to the negative influence rule of temperature rise on isothermal adsorption;
c) and calculating the Langmuir volume and Langmuir pressure of the organic matter at the temperature T based on the calculation result of the step a) and the relation obtained in the step b).
Preferably, T0The langmuir volume and langmuir pressure of the organic matter at the temperature are calculated by the following formulas, respectively:
wherein,is T0Langmuir volume of organic matter at temperature, TOC organic matter content, RoThe organic matter maturity is shown as the degree of maturity,is T0The Langmuir pressure of the organic matters at the temperature, k1, k2, C1 and C2 are coefficients of a curve of the organic matter isothermal adsorption constant changing with the organic matter content.
Preferably, the langmuir volume and langmuir pressure of the organic matter are respectively as follows:
wherein C3 and C4 are coefficients of a curve of the organic isothermal adsorption constant along with the change of temperature.
Preferably, the wet clay isothermal adsorption constant comprises the langmuir volume of the wet clay and the langmuir pressure of the wet clay, the wet clay adsorbed gas content is calculated by the formula:
wherein,the content of the wet clay adsorbed gas under the temperature T and the pressure p,langmuir volume of wet clay at temperature T,langmuir pressure of wet clay at temperature T.
Preferably, the langmuir volume and langmuir pressure of the wet clay at temperature T is calculated by:
a') calculating langmuir volume and langmuir pressure of wet clay at a temperature T0 based on the relative contents of the clay mineral components of the shale gas reservoir at a temperature T0, the total clay mineral content, and the clay pore irreducible water saturation;
b') obtaining a relational expression of the Langmuir volume and the Langmuir pressure of the wet clay along with the temperature change according to the negative influence rule of the temperature rise on isothermal adsorption;
c ') calculating the Langmuir volume and Langmuir pressure of the wet clay at the temperature T based on the calculation of step a ') and the relationship obtained in step b ').
Preferably, T0Langmuir volume and Langmuir pressure of wet clay at temperatureCalculated by the following formula:
wherein,for clay irreducible water saturation, D is the ratio of the Langmuir volume of wet clay to the Langmuir volume of dry clay under equilibrium water wetting conditions, wclyC5 and C6 are coefficients of a curve of the isothermal adsorption constant of the clay along with the change rule of the saturation of clay bound water,is T0Langmuir volume of dry clay at temperature, calculated as:in the formula wdry-clyIs the shale dry clay content, wiIs the relative content of the clay mineral component i,langmuir volume of clay mineral component i.
Preferably, the langmuir volume and langmuir pressure of the wet clay are, respectively, as a function of temperature:
wherein C7 and C8 are coefficients of a curve of the isothermal adsorption constant of the organic matter changing with the temperature.
Preferably, the organic matter adsorbed gas content and the wet clay adsorbed gas content are superposed in step 5) to obtain the total shale gas reservoir adsorbed gas content.
The method provides an effective means for determining the content of the shale gas reservoir adsorbed gas by using logging information, key parameters in the method can be obtained according to the logging information, the operability and reliability are high, the logging evaluation precision of the content of the shale reservoir adsorbed gas is effectively improved, and the method has great practical value in shale gas exploration and development.
The method of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 is a flow chart of a method of determining shale gas reservoir free sorption ratio in accordance with an exemplary embodiment of the present invention.
Figure 2 shows the langmuir volume of organic matter as a function of maturity.
Figure 3 shows organic langmuir pressure as a function of organic content.
Figure 4 shows langmuir volume of wet clay as a function of irreducible water saturation.
Fig. 5 shows the organic isothermal adsorption constant as a function of temperature.
FIG. 6 is a diagram of well logging evaluation results of adsorbed gas content of shale gas reservoirs in the Sichuan basin.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
A method of determining an adsorbed gas content of a shale gas reservoir according to an exemplary embodiment of the present invention is described in detail below with reference to fig. 1.
As shown in fig. 1, the method mainly comprises the following steps:
step 1: determining T based on logging data and shale core experimental data0Shale gas reservoir organic matter content and maturity at temperature, and T0Relative content of clay mineral components, total clay mineral content, clay pore bound water saturation of shale gas reservoir at temperature.
Step 2: and determining the isothermal adsorption constant of the organic matter based on the change rule of the isothermal adsorption constant of the organic matter along with the content, maturity and temperature of the organic matter.
The organic isothermal adsorption constant includes the langmuir volume of the organic and the langmuir pressure of the organic. The isothermal adsorption constant of organic matter can be determined by:
first, T is determined0Isothermal adsorption constant of shale organic matter at temperature.
Experimental research shows that under the condition of isothermal adsorption, the Langmuir volume (namely the maximum adsorption quantity) of the organic matters and the content of the organic matters are in a linear positive correlation relationship, and the maturity RoWhen the content is less than 2.5 percent, the maximum adsorption quantity of the organic matters in unit content increases along with the increase of maturity; when the maturity is more than 2.5 percent, the maximum adsorption amount of the organic matters per unit content is reduced along with the increase of the maturity.
The langmuir volume of shale organic matter can be determined from the log evaluated shale organic matter content and maturity by the following formula:
wherein,is T0Langmuir volume of organic matter at temperature, TOC organic matter content, RoThe organic matter maturity is shown as the degree of maturity,is T0The Langmuir pressure of the organic matters at the temperature, k1, k2, C1 and C2 are coefficients of a curve of a change rule of the isothermal adsorption constant of the organic matters along with the content of the organic matters, and can be determined by experimental rules or selected by regional experience respectively.
The langmuir volume of organic matter as a function of maturity is shown in figure 2.
Under the isothermal adsorption condition, the Langmuir pressure of the organic matter and the organic matter content have a negative exponential relationship, and the Langmuir pressure of the shale organic matter can be determined according to the organic matter content evaluated by logging according to the following formula:
wherein,is T0The Langmuir pressure of the organic matter at the temperature is Mpa, and the TOC is the organic matter content.
The organic langmuir pressure as a function of organic content is shown in figure 3.
The negative law of influence of temperature increase on isothermal adsorption is to decrease the langmuir volume of the adsorbate while increasing the langmuir pressure of the adsorbate.
The temperature-dependent isothermal adsorption constant of organic matter as a function of temperature can be expressed by equation (4) and equation (5), and is shown in fig. 4:
in the formula,is the langmuir volume of organic matter at temperature T,the Langmuir pressure of the organic matter at the temperature T, and the C3 and C4 are coefficients of a rule curve of the isothermal adsorption constant of the organic matter along with the temperature change, and can be determined by experimental rules or selected by regional experience respectively.
And step 3: and determining the isothermal adsorption constant of the wet clay based on the change rule of the isothermal adsorption constant of the clay mineral along with the relative content of the clay components, the total content of the clay minerals, the saturation of clay pore bound water and the temperature.
Experimental studies show that the clay mineral also has adsorbability, and compared with organic matters, the clay mineral has similar sensitivity to methane adsorption, and only the clay mineral has lower adsorption capacity than the organic matters. The adsorption capacity of pure rock of different clay minerals to methane is different, and the maximum adsorption capacity of the mixed dry clay to methane can be evaluated by the following formula by combining well logging evaluation of determined clay mineral components and relative contents thereof and total content of the clay minerals:
in the formula,is T0Langmuir volume of mixed dry clay at temperature in units of cm3/g or m 3/t; w is aiIs the relative content of clay mineral component i;is the Langmuir volume of clay mineral component i in units of cm3/g or m 3/t; w is adry-clyThe mass content of the shale dry clay is shown.
The clay mineral surface is often negatively charged and is more easily adsorbed by water molecules with polarity, and the adsorption capacity of the clay mineral for methane is significantly negatively influenced when the shale pores contain free water or bound water. Studies have shown that the greater the clay bound water content, the lower the adsorption capacity of the clay for methane, and that under equilibrium water wetting conditions (i.e., clay pore bound water saturation of 1), the ratio of the langmuir volume of wet clay to the langmuir volume of dry clay is D, which can be approximated by the following linear relationship, as shown in figure 5:
wherein,for clay irreducible water saturation, D is the ratio of the Langmuir volume of wet clay to the Langmuir volume of dry clay under equilibrium water wetting conditions, wclyIn order to be able to determine the wet clay content,is T0Langmuir volume of dry clay at temperature.
Similar to organic matter, the langmuir pressure of a clay mineral has a negative exponential correlation with the total content of the clay mineral, as follows:
wherein, wclyIs the wet clay content.
The temperature increase has a negative effect on isothermal adsorption, reducing the langmuir volume of the adsorbate while increasing the langmuir pressure of the adsorbate.
The temperature-influenced isothermal adsorption constant of the wet clay as a function of temperature can be expressed by equation (10) and equation (11):
in the formula, C7 and C8 are coefficients of a curve of the isothermal adsorption constant of the organic matters changing with the temperature, can be determined by experimental rules or selected by regional experience respectively,langmuir volume of wet clay at temperature T,langmuir pressure of wet clay at temperature T.
And 4, step 4: and respectively determining the content of organic adsorption gas and the content of wet clay adsorption gas based on the organic isothermal adsorption constant and the wet clay isothermal adsorption constant.
The isothermal adsorption of the organic matters and the wet clay accords with Langmuir adsorption characteristics, and the adsorption gas content of the organic matters and the wet clay can be respectively determined by the determined isothermal adsorption constants through the formulas (1) and (6):
wherein,the content of organic adsorption gas under the temperature T and the pressure p,is the langmuir volume of organic matter at temperature T,is the Langmuir pressure of the organic matter at the temperature T;the content of the wet clay adsorbed gas under the temperature T and the pressure p,langmuir volume of wet clay at temperature T,langmuir pressure of wet clay at T temperatureForce.
And 5: and determining the total content of the shale gas reservoir adsorbed gas based on the organic matter adsorbed gas content and the wet clay adsorbed gas content.
Specifically, the total content of shale gas reservoir adsorbed gas, namely the total content of shale gas reservoir adsorbed gas, can be obtained by overlapping the content of the organic matter adsorbed gas and the content of the wet clay adsorbed gas
Application example
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
By applying the method, the logging evaluation of the content of the reservoir adsorbed gas is carried out on the shale gas well from the Fuling area of the Sichuan basin.
Firstly, important information such as the clay mass content of the shale gas reservoir (the curve of the 5 th curve in fig. 6 is a calculation result, and the bar-shaped line is a core analysis result), the clay mineral component and relative content (the curve of the 6 th curve in fig. 6 is a calculation result, and the bar-shaped line is a core analysis result), the organic matter content (the curve of the 8 th curve in fig. 6 is a calculation result, and the bar-shaped line is a core analysis result), the organic matter maturity (the curve of the 9 th curve in fig. 6 is a calculation result, and the bar-shaped line is a core analysis result), and the clay pore bound water saturation (the solid line in the 11 th curve in fig. 6) is determined according to the logging information and the core analysis, and compared with the core.
The adsorbed gas content of the reservoir can be further determined according to the invention. Firstly, determining the Langmuir volume and pressure of the organic matter by using the organic matter content and the organic matter maturity (Langmuir 10 in FIG. 6); secondly, determining the Langmuir of the dry clay by utilizing the relative content of the components of the clay mineral and the mass content of the clay mineralThe Langmuir volume and the pressure (the Langmuir volume of illite, illite-smectite mixed layer and chlorite mineral in the area are respectively 1.72, 3.66 and 2.28cm3(g) determining the wet clay Langerhans volume using clay pore bound water saturation; thirdly, utilizing the reservoir temperature (lane 12 in figure 6) determined by the logging data to respectively correct the influence of the temperature on the langmuir volume and pressure of the organic matter and the wet clay; finally, the reservoir pressure (fig. 6, lane 12) determined by the logging data is used to determine the content of adsorbed gas of organic matter and wet clay (fig. 6, lane 13) respectively; the two parts of adsorbed gas content are superposed to obtain the adsorbed gas content of the shale gas reservoir (figure 5, 14 th), in the embodiment, the adsorbed gas content actually measured by core analysis is consistent with the adsorbed gas content determined by the method of the invention (figure 5, 14 th curve is a calculation result, and a bar-shaped line is a core analysis result), and the method is proved to have higher reliability for solving the evaluation problem of the adsorbed gas content of the shale gas reservoir.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A method of determining the adsorbed gas content of a shale gas reservoir, the method comprising the steps of:
1) determining T based on logging data and shale core experimental data0Shale gas reservoir organic matter content and maturity at temperature, and T0Relative content of clay mineral components, total clay mineral content and clay pore bound water saturation of the shale gas reservoir at the temperature;
2) determining the isothermal adsorption constant of the organic matter based on the change rule of the isothermal adsorption constant of the organic matter along with the content, maturity and temperature of the organic matter;
3) determining the isothermal adsorption constant of the wet clay based on the change rule of the isothermal adsorption constant of the clay mineral along with the relative content of clay components, the total content of the clay minerals, the saturation of clay pore bound water and the temperature;
4) respectively determining the content of organic adsorption gas and the content of wet clay adsorption gas based on the organic isothermal adsorption constant and the wet clay isothermal adsorption constant;
5) and determining the total content of the shale gas reservoir adsorbed gas based on the organic matter adsorbed gas content and the wet clay adsorbed gas content.
2. The method of determining shale gas reservoir adsorbed gas content of claim 1, wherein said organic matter isothermal adsorption constant comprises langmuir volume and langmuir pressure of organic matter, said organic matter adsorbed gas content calculated by the following equation:
wherein,the content of organic adsorption gas under the temperature T and the pressure p,is the langmuir volume of organic matter at temperature T,is the langmuir pressure of the organic matter at temperature T.
3. The method of determining adsorbed gas content of a shale gas reservoir as claimed in claim 2, wherein the langmuir volume and langmuir pressure of organic matter at T temperature is calculated by:
a) based on T0Calculating the content and maturity of organic matters in the shale gas reservoir at the temperature, and calculating the T0Langmuir volume and langmuir pressure of organic matter at temperature;
b) obtaining a relation between the Langmuir volume of the organic matter and Langmuir pressure along with temperature change according to the negative influence rule of temperature rise on isothermal adsorption;
c) and calculating the Langmuir volume and Langmuir pressure of the organic matter at the temperature T based on the calculation result of the step a) and the relation obtained in the step b).
4. The method of determining the adsorbed gas content of a shale gas reservoir of claim 3, wherein T is0The langmuir volume and langmuir pressure of the organic matter at the temperature are calculated by the following formulas, respectively:
wherein,is T0Langmuir volume of organic matter at temperature, TOC organic matter content, RoThe organic matter maturity is shown as the degree of maturity,is T0The Langmuir pressure of the organic matters at the temperature, k1, k2, C1 and C2 are coefficients of a curve of the organic matter isothermal adsorption constant changing with the organic matter content.
5. The method for determining adsorbed gas content of a shale gas reservoir as claimed in claim 4, wherein the Langmuir volume and Langmuir pressure of organic matter as a function of temperature are respectively:
wherein C3 and C4 are coefficients of a curve of the organic isothermal adsorption constant along with the change of temperature.
6. The method of determining adsorbed gas content of a shale gas reservoir as claimed in claim 1, wherein said wet clay isothermal adsorption constants comprise langmuir volume of wet clay and langmuir pressure of wet clay, said wet clay adsorbed gas content calculated by the formula:
wherein,the content of the wet clay adsorbed gas under the temperature T and the pressure p,langmuir volume of wet clay at temperature T,langmuir pressure of wet clay at temperature T.
7. The method of determining adsorbed gas content of a shale gas reservoir as claimed in claim 7, wherein the langmuir volume and langmuir pressure of wet clay at temperature T is calculated by:
a') is based on T0Relative content of clay mineral components, total clay mineral content and clay pores of shale gas reservoir at temperatureGap bound water saturation, calculating T0Langmuir volume and langmuir pressure of wet clay at temperature;
b') obtaining a relational expression of the Langmuir volume and the Langmuir pressure of the wet clay along with the temperature change according to the negative influence rule of the temperature rise on isothermal adsorption;
c ') calculating the Langmuir volume and Langmuir pressure of the wet clay at the temperature T based on the calculation of step a ') and the relationship obtained in step b ').
8. The method of determining the adsorbed gas content of a shale gas reservoir of claim 7, wherein T is0The langmuir volume and langmuir pressure of the wet clay at temperature were calculated by the following formulas, respectively:
wherein,for clay irreducible water saturation, D is the ratio of the Langmuir volume of wet clay to the Langmuir volume of dry clay under equilibrium water wetting conditions, wclyC5 and C6 are coefficients of a curve of the isothermal adsorption constant of the clay along with the change rule of the saturation of clay bound water,is T0Langmuir volume of dry clay at temperature, calculated as:in the formula wdry-clyIs the shale dry clay content, wiIs the relative content of the clay mineral component i,langmuir volume of clay mineral component i.
9. The method of determining adsorbed gas content of a shale gas reservoir as claimed in claim 8, wherein the langmuir volume and langmuir pressure of wet clay as a function of temperature are respectively:
wherein C7 and C8 are coefficients of a curve of the isothermal adsorption constant of the organic matter changing with the temperature.
10. The method for determining the content of the shale gas reservoir adsorbed gas according to claim 1, wherein the content of the organic matter adsorbed gas and the content of the wet clay adsorbed gas are superposed in step 5) to obtain the total content of the shale gas reservoir adsorbed gas.
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