CN109212161A - A kind of method of determining shale gas reservoir adsorbed gas content - Google Patents
A kind of method of determining shale gas reservoir adsorbed gas content Download PDFInfo
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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 present invention relates to unconventional oil and gas exploration and development fields, adsorb more particularly, to a kind of determining shale gas reservoir
The method of Gas content.
Background technique
It is the basic feature that shale gas reservoir is different from conventional gas and oil reservoir with adsorbed state preservation natural gas.According to well logging
Data accurate evaluation shale adsorbed gas content is the important foundation and unconventional oil and gas reservoir of shale gas exploration and development fining
The key problem of evaluation.The exact evaluation of shale adsorbed gas content has for accurately recognizing such reservoir resource potential to pass weight
The meaning wanted.
Carry out the quantitative assessment of shale adsorbed gas content at present, it is main to use for reference coal bed gas isothermal adsorption method, first with experiment
Method determines shale core Isothermal Adsorption Characteristics curve, on this basis, by well-log information, carries out whole well section adsorbed gas content
Continuous evaluation.Li Wu is extensively equal, and (Li Wuguang, Yang Sheng come, and the such as Xu Jing consider the shale adsorbed gas content meter of formation temperature and pressure
Calculate new model [J] natural gas geoscience, 2012,23 (4): 791-796) adsorption isotherm experiment according to a small amount of (4 pieces) rock core
Data are fitted by data, establish the Lang Gemiaoer isothermal adsorption volume and the reservoir content of organic matter, maturity, storage of shale
The relational expression of layer temperature and pressure.(the new page HF-1 well of the Western Sichuan such as Chen Lei, Jiang Zhenxue, Xing Jinyan must five sections of mud pages by Chen Lei etc.
Rock adsorbed gas content Dominated Factors and its Quantitative Prediction Model [J] modern times geology, 2014,28 (4): 824-831) with shale rock
Based on heart adsorption isotherm experiment data, principal component point has been carried out with several influence factors of the SPSS software to adsorbed gas content
Analysis determines that specific surface area, humidity and pressure are to influence the principal element of adsorbed gas content, and establish while considering above-mentioned 3 masters
The shale adsorbed gas content novel model of calculating of control factor.Above-mentioned two classes method, merely from data fitting/mathematical statistics angle analysis
Adsorbed gas Dominated Factors and its computation model are established, computational accuracy is limited by experimental data amount, and computation model physical significance is unclear
Clear and evaluation reliability is lower.Once prosperous equal (Zeng Xin, Sun Jianmeng, Cui Hong pearl change isothermal shale adsorbed gas volume computation model [J]
Logging technique, 2011,38 (3): 287-291) isotherm adsorption data accorded under the different temperatures of Binding experiment room is according to the analysis, total organic
Matter content is to restrict the principal element of shale adsorption capacity, under different pressures, the influence degree that temperature adsorbs shale almost phase
Together, clay mineral constructs the shale adsorbed gas quantitative calculation for not considering adsorption by clay to shale Adsorption Effect very little accordingly.
This kind of computation model does not fully realize influence of the clay mineral for shale adsorption capacity, by clay-bound water and clay pit
Object isolates as two independent influence factors, ignores clay mineral adsorption capacity and irreducible water to the shadow of adsorption by clay ability
It rings, computation model can not accurately reflect shale adsorbed gas preservation mechanism, and reliability is lower.
Therefore, it is necessary to using shale adsorbed gas supporting environment as fundamental starting point, it is clear to establish physical significance, concentrated expression
The shale adsorbed gas content quantitative evalution model of organic matter, adsorption by clay ability and its influence factor, to improve shale gas reservoir
Adsorbed gas content evaluation precision.
The information for being disclosed in background of invention part is merely intended to deepen the reason to general background technique of the invention
Solution, and it is known to those skilled in the art existing to be not construed as recognizing or imply that the information is constituted in any form
Technology.
Summary of the invention
It is unintelligible for current shale adsorbed gas content evaluation method physical significance, fail to fully consider that clay mineral adsorbs
Ability and the lower problem of reliability, the present invention establish a kind of evaluation method of new shale gas reservoir adsorbed gas content.
The method of determining shale gas reservoir adsorbed gas content according to the present invention may comprise steps of:
1) it is based on well-log information and shale core experimental data, determines T0At a temperature of the shale gas reservoir content of organic matter with
Maturity and T0At a temperature of shale gas Clay Mineral component relative amount, clay mineral total content, clay pocket of pore
Tie up water saturation；
2) based on organic matter isothermal adsorption constant with the changing rule of the content of organic matter, maturity and temperature, determination has
Machine matter isothermal adsorption constant；
3) based on clay mineral isothermal adsorption constant with the relative amount, clay mineral total content, clay hole of clay composition
The changing rule of gap irreducible water saturation and temperature determines damp clay isothermal adsorption constant；
4) it is based on the organic matter isothermal adsorption constant and the damp clay isothermal adsorption constant, determines that organic matter is inhaled respectively
Attached Gas content and damp clay adsorbed gas content；
5) determine that shale gas reservoir adsorbed gas always contains based on the organic matter adsorbed gas content and damp clay adsorbed gas content
Amount.
Preferably, the organic matter isothermal adsorption constant includes the Lang Gemiaoer volume of organic matter and the Lang Gemiao of organic matter
That pressure, the organic matter adsorbed gas content are calculated by the following formula:
Wherein,For organic matter adsorbed gas content under T temperature, p pressure,For the Lang Gemiao of organic matter at a temperature of T
That volume,For the Lang Gemiaoer pressure of organic matter at a temperature of T.
Preferably, the Lang Gemiaoer volume and Lang Gemiaoer pressure of organic matter are calculated by following steps at a temperature of T:
A) it is based on T0At a temperature of the shale gas reservoir content of organic matter and maturity, calculate T0At a temperature of organic matter Lang Gemiao
That volume and Lang Gemiaoer pressure；
B) the Lang Gemiaoer volume that organic matter is obtained to the negative effect of isothermal adsorption rule and bright is increased according to temperature
Ge Miaoer pressure with temperature change relational expression；
C) relational expression that the calculated result based on step a) and step b) are obtained calculates the Lang Gemiao of organic matter at a temperature of T
That volume and Lang Gemiaoer pressure.
Preferably, T0At a temperature of organic matter Lang Gemiaoer volume and Lang Gemiaoer pressure pass through following formula meter respectively
It calculates:
Wherein,For T0At a temperature of organic matter Lang Gemiaoer volume, TOC is the content of organic matter, RoFor organic matter maturation
Degree,For T0At a temperature of organic matter Lang Gemiaoer pressure, k1, k2, C1, C2 be organic matter isothermal adsorption constant with organic matter
The coefficient of changes of contents law curve.
Preferably, the Lang Gemiaoer volume and Lang Gemiaoer pressure of organic matter are respectively as follows: with the relational expression of temperature change
Wherein, C3, C4 are the coefficient of organic matter isothermal adsorption constant with temperature variation rule curve.
Preferably, the damp clay isothermal adsorption constant includes the Lang Gemiaoer volume of damp clay and the Lang Gemiao of damp clay
That pressure, the damp clay adsorbed gas content are calculated by the following formula:
Wherein,For damp clay adsorbed gas content under T temperature, p pressure,For the Lang Gemiao of damp clay at a temperature of T
That volume,For the Lang Gemiaoer pressure of damp clay at a temperature of T.
Preferably, the Lang Gemiaoer volume and Lang Gemiaoer pressure of damp clay are calculated by following steps at a temperature of T:
A ') relative amount, clay mineral total content based on shale gas Clay Mineral component at a temperature of T0 and viscous
Soil pores irreducible water saturation calculates the Lang Gemiaoer volume and Lang Gemiaoer pressure of damp clay at a temperature of T0；
B ') the Lang Gemiaoer volume that damp clay is obtained to the negative effect of isothermal adsorption rule and bright is increased according to temperature
Ge Miaoer pressure with temperature change relational expression；
C ') be based on step a ') calculated result and step b ') obtained relational expression, calculate the Lang Ge of damp clay at a temperature of T
Miao Er volume and Lang Gemiaoer pressure.
Preferably, T0At a temperature of damp clay Lang Gemiaoer volume and Lang Gemiaoer pressure pass through following formula meter respectively
It calculates:
Wherein,For clay bound water saturation, D is damp clay Lang Gemiaoer volume under the wetting conditions of equilibrium water and does
The ratio between clay Lang Gemiaoer volume, wclyFor damp clay content, C5, C6 are that the isothermal adsorption constant of clay is full with clay-bound water
With degree variation rule curve coefficient,For T0At a temperature of dry clay Lang Gemiaoer volume, its calculation formula is:W in formuladry-clyFor shale dry clay content, wiFor the phase of clay mineral component i
To content,For the Lang Gemiaoer volume of clay mineral component i.
Preferably, the Lang Gemiaoer volume and Lang Gemiaoer pressure of damp clay are respectively as follows: with the relational expression of temperature change
Wherein, C7, C8 are the coefficients of the isothermal adsorption constant with temperature variation rule curve of organic matter.
Preferably, the organic matter adsorbed gas content and damp clay adsorbed gas content are overlapped to obtain in step 5)
To shale gas reservoir adsorbed gas total content.
The present invention is determines that shale gas reservoir adsorbed gas content provides effective means using well-log information, in this method
Key parameter can be obtained according to well-log information, have stronger operability and reliability, and effectively increase shale reservoir
Adsorbed gas content logging evaluation precision has great practical value in shale gas exploration and development.
Method of the invention has other characteristics and advantages, these characteristics and advantages from the attached drawing being incorporated herein and with
Will be apparent in specific embodiment afterwards, or by the attached drawing and subsequent specific embodiment being incorporated herein into
Row statement, these the drawings and specific embodiments in detail are used together to explain specific principle of the invention.
Detailed description of the invention
Exemplary embodiment of the present is described in more detail in conjunction with the accompanying drawings, of the invention is above-mentioned and other
Purpose, feature and advantage will be apparent, wherein in exemplary embodiments of the present invention, identical reference label is usual
Represent same parts.
Fig. 1 is the process of the method for the free absorption ratio of determination shale gas reservoir of exemplary implementation scheme according to the present invention
Figure.
Fig. 2 shows the Lang Gemiaoer volumes of organic matter with maturity variation relation.
Fig. 3 shows organic matter Lang Gemiaoer pressure with content of organic matter variation relation.
Fig. 4 shows damp clay Lang Gemiaoer volume with irreducible water saturation variation relation.
Fig. 5 shows the relationship of organic matter isothermal adsorption constant with temperature variation.
Fig. 6 is Sichuan Basin shale gas reservoir adsorbed gas content logging evaluation result map.
Specific embodiment
The present invention will be described in more detail below with reference to accompanying drawings.Although showing the preferred embodiment of the present invention in attached drawing,
However, it is to be appreciated that may be realized in various forms the present invention and should not be limited by the embodiments set forth herein.On the contrary, providing
These embodiments are of the invention more thorough and complete in order to make, and can will fully convey the scope of the invention to ability
The technical staff in domain.
Determining shale gas reservoir adsorbed gas content according to an exemplary embodiment of the present invention is described in detail below with reference to Fig. 1
Method.
As described in Figure 1, this method mainly comprises the steps that
Step 1: being based on well-log information and shale core experimental data, determine T0At a temperature of shale gas reservoir organic matter contain
Amount and maturity and T0At a temperature of shale gas Clay Mineral component relative amount, clay mineral total content, clay hole
Gap irreducible water saturation.
Step 2: based on organic matter isothermal adsorption constant with the changing rule of the content of organic matter, maturity and temperature, really
Determine organic matter isothermal adsorption constant.
The organic matter isothermal adsorption constant includes the Lang Gemiaoer volume of organic matter and the Lang Gemiaoer pressure of organic matter.It can
To determine organic matter isothermal adsorption constant by following steps:
Firstly, determining T0At a temperature of shale organic matter isothermal adsorption constant.
Under the conditions of experimental study shows isothermal adsorption, the Lang Gemiaoer volume (i.e. maximal absorptive capacity) of organic matter with it is organic
The linear positive correlation of matter content, and maturity RoWhen less than 2.5%, the maximal absorptive capacity of unit content organic matter is with maturation
Degree increases and increases；When maturity is greater than 2.5%, the maximal absorptive capacity of unit content organic matter increases with maturity instead and is subtracted
It is small.
The bright of shale organic matter can be determined by following formula, the shale content of organic matter and maturity of foundation logging evaluation
Ge Miaoer volume:
Wherein,For T0At a temperature of organic matter Lang Gemiaoer volume, TOC is the content of organic matter, RoFor organic matter maturation
Degree,For T0At a temperature of organic matter Lang Gemiaoer pressure, k1, k2, C1, C2 be organic matter isothermal adsorption constant with organic matter
The coefficient of changes of contents law curve or regional experience determining by experiment law can be chosen respectively.
The Lang Gemiaoer volume of organic matter is as shown in Figure 2 with the variation relation of maturity.
Under the conditions of isothermal adsorption, there are negative exponent relationship, Ke Yitong with the content of organic matter for the Lang Gemiaoer pressure of organic matter
Following formula, the content of organic matter according to logging evaluation are crossed, determines the Lang Gemiaoer pressure of shale organic matter:
Wherein,For T0At a temperature of organic matter Lang Gemiaoer pressure, unit Mpa, TOC are the content of organic matter.
Organic matter Lang Gemiaoer pressure is as shown in Figure 3 with the variation relation of the content of organic matter.
Temperature increases the negative effect rule for isothermal adsorption, can reduce the Lang Gemiaoer volume of adsorbate, increase simultaneously
The Lang Gemiaoer pressure of big adsorbate.
The relationship for the organic matter isothermal adsorption constant with temperature variation being affected by temperature can be by formula (4) and formula
(5) it indicates, and as shown in Figure 4:
In formula,For the Lang Gemiaoer volume of organic matter at a temperature of T,For the Lang Gemiaoer pressure of organic matter at a temperature of T
Power, C3, C4 are the coefficient of organic matter isothermal adsorption constant with temperature variation rule curve, can be determined respectively by experiment law
Or regional experience is chosen.
Step 3: based on clay mineral isothermal adsorption constant with the relative amount of clay composition, clay mineral total content, viscous
The changing rule of soil pores irreducible water saturation and temperature determines damp clay isothermal adsorption constant.
Experimental study shows that clay mineral equally has adsorptivity, and compared with organic matter, clay mineral is for methane
Absorption has similar sensibility, and only clay mineral adsorption capacity is low compared with organic matter.Differed clay mineral clean rock is for methane
Adsorption capacity have differences, in conjunction with logging evaluation determine clay mineral component and its relative amount and clay mineral it is total
Content can evaluate mixing dry clay for the maximum adsorption ability of methane with following formula:
In formula,For T0At a temperature of mix dry clay Lang Gemiaoer volume, unit be cm3/g or m3/t；wiFor
The relative amount of clay mineral component i；For the Lang Gemiaoer volume of clay mineral component i, unit is cm3/g or m3/
t；wdry-clyFor shale dry clay mass content.
Clay mineral surface often has negative electricity, it is easier to which, by with polar Water Molecular Adsorption, shale hole is containing Free water
Or when irreducible water, clay mineral will receive significant negative effect for the adsorption capacity of methane.Studies have shown that clay-bound water
Content is bigger, and clay is lower to the adsorption capacity of methane, and (i.e. clay hole irreducible water saturation is 1 under the wetting conditions of equilibrium water
When), the ratio between damp clay Lang Gemiaoer volume and dry clay Lang Gemiaoer volume are D, can use following linear relationship approximation table
Up to this rule, as shown in Figure 5:
Wherein,For clay bound water saturation, D is damp clay Lang Gemiaoer volume under the wetting conditions of equilibrium water and does
The ratio between clay Lang Gemiaoer volume, wclyFor damp clay content,For T0At a temperature of dry clay Lang Gemiaoer volume.
Similar to organic matter, the Lang Gemiaoer pressure of clay mineral and clay mineral total content are closed there are negative exponent is related
System, such as following formula:
Wherein, wclyFor damp clay content.
Temperature raising has negative effect for isothermal adsorption, can reduce the Lang Gemiaoer volume of adsorbate, while increasing suction
The Lang Gemiaoer pressure of attached matter.
The relationship for the damp clay isothermal adsorption constant with temperature variation being affected by temperature can be by formula (10) and formula
(11) it indicates:
In formula, C7, C8 are the coefficients of the isothermal adsorption constant with temperature variation rule curve of organic matter, can be passed through respectively
Experiment law is determining or regional experience is chosen,For the Lang Gemiaoer volume of damp clay at a temperature of T,It is wet at a temperature of T
The Lang Gemiaoer pressure of clay.
Step 4: being based on the organic matter isothermal adsorption constant and the damp clay isothermal adsorption constant, determine respectively organic
Matter adsorbed gas content and damp clay adsorbed gas content.
Organic matter and damp clay isothermal adsorption meet Lang Gemiaoer characterization of adsorption, utilize the isothermal adsorption constant of above-mentioned determination
The adsorbed gas content of organic matter and damp clay can be determined respectively by formula (1) and formula (6):
Wherein,For organic matter adsorbed gas content under T temperature, p pressure,For the Lang Gemiao of organic matter at a temperature of T
That volume,For the Lang Gemiaoer pressure of organic matter at a temperature of T；Contain for damp clay adsorbed gas under T temperature, p pressure
Amount,For the Lang Gemiaoer volume of damp clay at a temperature of T,For the Lang Gemiaoer pressure of damp clay at a temperature of T.
Step 5: shale gas reservoir adsorbed gas is determined based on the organic matter adsorbed gas content and damp clay adsorbed gas content
Total content.
Specifically, shale can be obtained by the organic matter adsorbed gas content and damp clay adsorbed gas content being overlapped
Gas reservoir adsorbed gas total content, i.e.,
Using example
A concrete application example is given below in the scheme and its effect of the embodiment of the present invention for ease of understanding.This field
It should be understood to the one skilled in the art that the example is only for the purposes of understanding the present invention, any detail is not intended to be limited in any way
The system present invention.
With the application of the invention, carrying out the Logging Evaluation of reservoir adsorbed gas content to the shale gas well from Sichuan Basin Fuling Prefecture
Valence.
Firstly, determining that (the 5th curve of Fig. 6 is shale gas reservoir clayey amount content according to well-log information and core analysis
Calculated result, rod-shaped line are result of core analysis), (Fig. 6 the 6th is calculated result, the 7th for clay mineral component and relative amount
Road is result of core analysis), the content of organic matter (the 8th curve of Fig. 6 is calculated result, rod-shaped line is result of core analysis), have
Machine matter maturity (the 9th curve of Fig. 6 is calculated result, rod-shaped line is result of core analysis) and clay hole fetter water saturation
Important informations such as (solid lines in Fig. 6 the 11st) are spent, are compared with result of core analysis, above-mentioned reservoir parameter has more highly reliable
Property.
Reservoir adsorbed gas content can be further determined that according to the present invention.Firstly, mature using the content of organic matter, organic matter
Degree determines the Lang Gemiaoer volume and pressure (Fig. 6 the 10th) of organic matter；Secondly, using clay mineral component relative amount with
Clay mineral quality content determines that dry clay Lang Gemiaoer volume and pressure (choose illite, illite/smectite mixed layer, chlorite in this area
The Lang Gemiaoer volume of mineral is respectively as follows: 1.72,3.66,2.28cm3/ g), while clay hole irreducible water saturation is utilized, really
Determine damp clay Lang Shi volume；Again, the reservoir temperature (Fig. 6 the 12nd) determined using well-log information corrects temperature to having respectively
The influence of machine matter and damp clay Lang Gemiaoer volume and pressure；Finally, reservoir pressure (the Fig. 6 the 12nd determined using well-log information
Road), organic matter and damp clay adsorbed gas content (Fig. 6 the 13rd) are determined respectively；The superposition of two parts adsorbed gas content, as shale
Gas reservoir adsorbed gas content (Fig. 5 the 14th), the adsorbed gas content of core analysis actual measurement and utilization the method for the present invention are true in this example
Fixed adsorbed gas content coincide (the 14th curve of Fig. 5 is calculated result, rod-shaped line is result of core analysis), it was demonstrated that the present invention couple
There is higher reliability in solving shale gas reservoir adsorbed gas content evaluation problem.
It will be understood by those skilled in the art that above to the purpose of the description of the embodiment of the present invention only for illustratively saying
The beneficial effect of bright the embodiment of the present invention is not intended to limit embodiments of the invention to given any example.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport
In the principle, practical application or improvement to the technology in market for best explaining each embodiment, or make the art
Other those of ordinary skill can understand each embodiment disclosed herein.
Claims (10)
1. a kind of method of determining shale gas reservoir adsorbed gas content, which is characterized in that the described method comprises the following steps:
1) it is based on well-log information and shale core experimental data, determines T0At a temperature of the shale gas reservoir content of organic matter and mature
Degree and T0At a temperature of shale gas Clay Mineral component relative amount, clay mineral total content, clay hole irreducible water
Saturation degree；
2) organic matter is determined with the changing rule of the content of organic matter, maturity and temperature based on organic matter isothermal adsorption constant
Isothermal adsorption constant；
3) based on clay mineral isothermal adsorption constant with the relative amount, clay mineral total content, clay pocket of pore of clay composition
The changing rule for tiing up water saturation and temperature determines damp clay isothermal adsorption constant；
4) it is based on the organic matter isothermal adsorption constant and the damp clay isothermal adsorption constant, determines organic matter adsorbed gas respectively
Content and damp clay adsorbed gas content；
5) shale gas reservoir adsorbed gas total content is determined based on the organic matter adsorbed gas content and damp clay adsorbed gas content.
2. the method for determining shale gas reservoir adsorbed gas content according to claim 1, which is characterized in that the organic matter
Isothermal adsorption constant includes the Lang Gemiaoer volume of organic matter and the Lang Gemiaoer pressure of organic matter, and the organic matter adsorbed gas contains
Amount is calculated by the following formula:
Wherein,For organic matter adsorbed gas content under T temperature, p pressure,For the Lang Gemiaoer body of organic matter at a temperature of T
Product,For the Lang Gemiaoer pressure of organic matter at a temperature of T.
3. the method for determining shale gas reservoir adsorbed gas content according to claim 2, which is characterized in that have at a temperature of T
The Lang Gemiaoer volume and Lang Gemiaoer pressure of machine matter are calculated by following steps:
A) it is based on T0At a temperature of the shale gas reservoir content of organic matter and maturity, calculate T0At a temperature of organic matter Lang Gemiaoer body
Long-pending and Lang Gemiaoer pressure；
B) the negative effect rule to isothermal adsorption is increased according to temperature, obtains the Lang Gemiaoer volume and Lang Gemiao of organic matter
Your pressure with temperature change relational expression；
C) relational expression that the calculated result based on step a) and step b) are obtained calculates the Lang Gemiaoer body of organic matter at a temperature of T
Long-pending and Lang Gemiaoer pressure.
4. the method for determining shale gas reservoir adsorbed gas content according to claim 3, which is characterized in that T0At a temperature of have
The Lang Gemiaoer volume and Lang Gemiaoer pressure of machine matter are calculated by the following formula respectively:
Wherein,For T0At a temperature of organic matter Lang Gemiaoer volume, TOC is the content of organic matter, RoFor maturity of organic matter,For T0At a temperature of organic matter Lang Gemiaoer pressure, k1, k2, C1, C2 be organic matter isothermal adsorption constant contain with organic matter
Measure the coefficient of variation rule curve.
5. the method for determining shale gas reservoir adsorbed gas content according to claim 4, which is characterized in that organic matter it is bright
Ge Miaoer volume and Lang Gemiaoer pressure are respectively as follows: with the relational expression of temperature change
Wherein, C3, C4 are the coefficient of organic matter isothermal adsorption constant with temperature variation rule curve.
6. the method for determining shale gas reservoir adsorbed gas content according to claim 1, which is characterized in that the damp clay
Isothermal adsorption constant includes the Lang Gemiaoer volume of damp clay and the Lang Gemiaoer pressure of damp clay, and the damp clay adsorbed gas contains
Amount is calculated by the following formula:
Wherein,For damp clay adsorbed gas content under T temperature, p pressure,For the Lang Gemiaoer body of damp clay at a temperature of T
Product,For the Lang Gemiaoer pressure of damp clay at a temperature of T.
7. the method for determining shale gas reservoir adsorbed gas content according to claim 7, which is characterized in that wet at a temperature of T
The Lang Gemiaoer volume and Lang Gemiaoer pressure of clay are calculated by following steps:
A ') it is based on T0At a temperature of shale gas Clay Mineral component relative amount, clay mineral total content and clay hole
Irreducible water saturation calculates T0At a temperature of damp clay Lang Gemiaoer volume and Lang Gemiaoer pressure；
B ') it is regular according to negative effect of the temperature raising to isothermal adsorption, obtain the Lang Gemiaoer volume and Lang Gemiao of damp clay
Your pressure with temperature change relational expression；
C ') be based on step a ') calculated result and step b ') obtained relational expression, calculate the Lang Gemiaoer of damp clay at a temperature of T
Volume and Lang Gemiaoer pressure.
8. the method for determining shale gas reservoir adsorbed gas content according to claim 7, which is characterized in that T0At a temperature of it is wet
The Lang Gemiaoer volume and Lang Gemiaoer pressure of clay are calculated by the following formula respectively:
Wherein,For clay bound water saturation, D is that damp clay Lang Gemiaoer volume and dry clay are bright under the wetting conditions of equilibrium water
The ratio between Ge Miaoer volume, wclyFor damp clay content, C5, C6 are that the isothermal adsorption constant of clay becomes with clay bound water saturation
The coefficient of law curve,For T0At a temperature of dry clay Lang Gemiaoer volume, its calculation formula is:W in formuladry-clyFor shale dry clay content, wiFor the phase of clay mineral component i
To content,For the Lang Gemiaoer volume of clay mineral component i.
9. the method for determining shale gas reservoir adsorbed gas content according to claim 8, which is characterized in that damp clay it is bright
Ge Miaoer volume and Lang Gemiaoer pressure are respectively as follows: with the relational expression of temperature change
Wherein, C7, C8 are the coefficients of the isothermal adsorption constant with temperature variation rule curve of organic matter.
10. the method for determining shale gas reservoir adsorbed gas content according to claim 1, which is characterized in that in step 5)
It is middle to be overlapped the organic matter adsorbed gas content and damp clay adsorbed gas content to obtain shale gas reservoir adsorbed gas and always contain
Amount.
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| CN110018293A (en) * | 2019-05-05 | 2019-07-16 | 西安石油大学 | It is a kind of to consider the water-sensitive multiphase coupled methane air content calculation method of shale clay |
| CN112051182A (en) * | 2020-09-07 | 2020-12-08 | 西南石油大学 | Method for rapidly predicting methane adsorption capacity of shale reservoirs at different depths |
| CN112528455A (en) * | 2019-09-03 | 2021-03-19 | 中国石油天然气股份有限公司 | Method and system for calculating reservoir pressure and dynamic reserve of adsorption unsaturated coal-bed gas well |
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