CN103439238A - Measurement method of storage porosity in coal shale - Google Patents

Measurement method of storage porosity in coal shale Download PDF

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CN103439238A
CN103439238A CN2013103944231A CN201310394423A CN103439238A CN 103439238 A CN103439238 A CN 103439238A CN 2013103944231 A CN2013103944231 A CN 2013103944231A CN 201310394423 A CN201310394423 A CN 201310394423A CN 103439238 A CN103439238 A CN 103439238A
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methane
storage
adsorption
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volume
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CN103439238B (en
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蔡益栋
刘大锰
姚艳斌
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China University of Geosciences
China University of Geosciences Beijing
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Abstract

The invention discloses a measurement method of storage porosity in coal shale. According to the measurement method, an open pore volume is obtained by testing the actual density and the apparent density, and a storage pore volume is obtained by carried out a methane experiment, so that the storage porosity can be more accurately measured and calculated, a total porosity test result is closer to an underground true value of the coal shale, and the measurement method is significant for reasonably evaluating the resource quantity of coal bed gas/shale gas, formulating exploration and development decisions and preventing and controlling mine gas disasters.

Description

The measuring method of storage porosity in danks
 
Technical field
The present invention relates to the measuring method of storage porosity in a kind of danks, belong to danks hole technical field of measurement and test.
Background technology
Danks is all organic rock of complicated porous, and its pore space is not comprise that crack is in interior part space, and factor of porosity content is one of key parameter characterized the danks reservoir characteristic.Factor of porosity has determined Existential Space and the perviousness of gas in the danks to a great extent, thereby affect absorption and the migration of coal-seam gas (shale gas), the Obtaining Accurate factor of porosity is significant for resources exploration and the mine gas diaster prevention and control of coal-seam gas (shale gas).
The danks voids content comprises open space and storage pore.Open space comprises permeable pore space and dead end pore space, is the active porosity be communicated with; Storage pore refers to the adsorbable seepage flow pore space that do not participate in.
It is relevant with the evolution degree of danks that storage pore accounts for the ratio of total pore space, high coal rank particularly, its space, storage pore is very important, the result of calculation of not considering storage pore will cause the stock number of actual coal-seam gas/shale gas to be underestimated, no matter be the concrete measurements and calculations that all do not relate to storage pore in existing newest standards or Research Literature.Thereby, need the measuring method of setting up storage pore content badly, for rational evaluation coal-seam gas (shale gas) stock number, formulation exploratory development decision-making and mine gas diaster prevention and control are significant.
Summary of the invention
The technical issues that need to address of the present invention just are to overcome the defect of prior art, and the measuring method of storage porosity in a kind of danks is provided, and the disappearance of measuring to fill up storage pore, solved problem how to calculate storage porosity.
For addressing the above problem, the present invention adopts following technical scheme:
The invention provides the measuring method of storage porosity in a kind of danks, described method comprises: test obtains the conventional sample of unit mass and the particulate samples density that diameter is less than 0.2mm, is respectively d a with d r , obtain the open space degree v p =1/ d a -1/ d r ; Utilize methane isothermal adsorption method to obtain storage pore volume μ.
Concrete steps are:
(1) collected specimens, treat that rock core proposes well head, takes out fresh bulk sample, and drill through cylindrical sample on fresh sample; Remaining sample is crushed to particle diameter and is less than below 0.2mm;
(2) utilize diameter to be less than the broken sample of 0.2mm, by coal and rock real density assay method GB/T 23561.2-2009, acquisition sample real density is d r ; By coal and rock pseudodensity assay method MT 40-1987, the pseudodensity that obtains sample is d a .
(3) calculate danks sample open space degree: v p =1/ d a -1/ d r ;
(4) according to open space methane adsorption time in particulate samples ( τ 1 ) and storage pore methane adsorption time ( τ 2 ) difference, obtain adsorptive pressure and the relational expression of time:
Figure 2013103944231100002DEST_PATH_IMAGE002
In formula:
Figure 2013103944231100002DEST_PATH_IMAGE004
for adsorption equilibrium pressure;
Figure 2013103944231100002DEST_PATH_IMAGE006
for particulate samples methane adsorption time; A and B are constant;
Figure 2013103944231100002DEST_PATH_IMAGE008
for the open space adsorption time;
Figure 2013103944231100002DEST_PATH_IMAGE010
for the storage pore adsorption time; The open space adsorption time is a few minutes, and the storage pore adsorption time is a couple of days;
Figure 848969DEST_PATH_IMAGE010
much larger than
Figure 372354DEST_PATH_IMAGE008
;
Figure 2013103944231100002DEST_PATH_IMAGE012
(5), according to the test of methane isothermal adsorption, obtain adsorption equilibrium pressure and open and close the pore volume relational expression:
In formula,
Figure 2013103944231100002DEST_PATH_IMAGE014
for particle storage pore volume;
Figure 2013103944231100002DEST_PATH_IMAGE016
for particle surface methane adsorption volume;
Figure 2013103944231100002DEST_PATH_IMAGE018
for contactor free gas volume;
Figure 2013103944231100002DEST_PATH_IMAGE020
for the particulate samples quality;
Figure 2013103944231100002DEST_PATH_IMAGE022
for initial concentration of methane gas;
Figure 2013103944231100002DEST_PATH_IMAGE024
for initial methane gas pressure;
Figure 2013103944231100002DEST_PATH_IMAGE026
for methane isothermal experiment temperature; for the Boltzmann constant;
(6) when initial concentration of methane gas
Figure 2013103944231100002DEST_PATH_IMAGE030
, and
Figure 300734DEST_PATH_IMAGE010
much larger than
Figure 542359DEST_PATH_IMAGE008
; Obtain the relational expression of methane adsorption equilibrium pressure and blind hole volume and particle surface methane adsorption volume;
Figure 2013103944231100002DEST_PATH_IMAGE032
(7) by
Figure 2013103944231100002DEST_PATH_IMAGE034
≈ 10 -3, can ignore particle surface methane adsorption volume
Figure 942117DEST_PATH_IMAGE016
; Can obtain methane adsorption equilibrium pressure and blind hole volume relationship formula:
Figure 2013103944231100002DEST_PATH_IMAGE036
(8) calculating the middle total pore size volume that produces coal is
Figure 2013103944231100002DEST_PATH_IMAGE038
;
(9) calculating the middle storage porosity that produces coal is
Figure 2013103944231100002DEST_PATH_IMAGE040
.
The features and advantages of the invention are: the measuring method of the storage porosity in danks of the present invention, can calculate more exactly storage porosity, make the total porosity test result closer to the underground actual value of danks, for rational evaluation coal-seam gas/shale gas stock number, formulation exploratory development decision-making and mine gas diaster prevention and control are significant.
The accompanying drawing explanation
Fig. 1 is danks pore texture schematic diagram.
Wherein, 1-crack and open space; The 2-storage pore; 3-danks matrix.
Embodiment
As shown in Figure 1, be danks pore texture schematic diagram.Comprising: crack and open space 1; Storage pore 2; With danks matrix 3.
The present embodiment discloses the measuring method of the storage porosity in a kind of danks, the i.e. test by real density and pseudodensity obtains the open space volume, obtain the storage pore volume by Experiment of Methane again, thereby can calculate more exactly storage porosity, make the total porosity test result closer to the underground actual value of danks, for rational evaluation coal-seam gas/shale gas stock number, formulation exploratory development decision-making and mine gas diaster prevention and control are significant.
In order more accurately, thoroughly to understand technical scheme of the present invention, below coordinate specific embodiment further to describe in detail the present invention.
Get 700 meters of the core coal sample degree of depth at the Qinshui basin scene, temperature is 27 ℃;
Carry to earth's surface until the coal core, remove rapidly its surperficial drilling fluid impurity, drill through vertically the cylinder sample of diameter 2cm, length 4cm;
According to coal and rock pseudodensity assay method MT 40-1987, the pseudodensity that obtains sample is 1.4 g/cm 3;
Remaining broken sample is passed through to the separating sieve sorting to 0.2mm, get the 100g particulate samples, according to coal and rock real density assay method GB/T 23561.2-2009, the pseudodensity that obtains sample is 1.51 g/cm 3; Calculating open space is v p =1/1.4-1/1.51=0.052;
According to the high pressure methane isothermal adsorption test standard GB/T 19560-2008 of coal, particle storage pore volume
Figure 716081DEST_PATH_IMAGE014
;
Contactor free gas volume,
Figure 113564DEST_PATH_IMAGE018
=10.5cm 3; Methane isothermal particulate samples quality,
Figure 842486DEST_PATH_IMAGE020
=242g; Initial methane gas pressure,
Figure 983617DEST_PATH_IMAGE024
=4.5MPa; Methane adsorption equilibrium pressure is 2.7MPa;
According to methane adsorption equilibrium pressure and blind hole volume relationship formula, obtain storage pore
Figure 481595DEST_PATH_IMAGE014
=(4.5-2.7) * 10.5/242/2.7=0.0289;
Finally according to open space and storage pore, obtaining this coal petrography sample storage porosity is:
Figure DEST_PATH_IMAGE042
=0.0289/ (0.052+0.0289)=0.357, the storage porosity of this sample is 35.7%.
Finally it should be noted that: obviously, above-described embodiment is only for example of the present invention clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being amplified out thus or change are still among protection scope of the present invention.

Claims (2)

1. the measuring method of storage porosity in a danks, is characterized in that, described method comprises: test obtains the conventional sample of unit mass and the particulate samples density that diameter is less than 0.2mm, is respectively d a with d r , obtain the open space degree v p =1/ d a -1/ d r ; Utilize methane isothermal adsorption method to obtain storage pore volume μ.
2. the measuring method of storage porosity in danks as claimed in claim 1, is characterized in that, concrete steps are:
(1) collected specimens, treat that rock core proposes well head, takes out fresh bulk sample, and drill through cylindrical sample on fresh sample; Remaining sample is crushed to particle diameter and is less than below 0.2mm;
(2) utilize diameter to be less than the broken sample of 0.2mm, by coal and rock real density assay method GB/T 23561.2-2009, acquisition sample real density is d r ; By coal and rock pseudodensity assay method MT 40-1987, the pseudodensity that obtains sample is d a .
(3) calculate danks sample open space degree: v p =1/ d a -1/ d r ;
(4) according to open space methane adsorption time in particulate samples ( τ 1 ) and storage pore methane adsorption time ( τ 2 ) difference, obtain adsorptive pressure and the relational expression of time:
Figure 2013103944231100001DEST_PATH_IMAGE002
In formula:
Figure 2013103944231100001DEST_PATH_IMAGE004
for adsorption equilibrium pressure;
Figure 2013103944231100001DEST_PATH_IMAGE006
for particulate samples methane adsorption time; A and B are constant;
Figure 2013103944231100001DEST_PATH_IMAGE008
for the open space adsorption time;
Figure 2013103944231100001DEST_PATH_IMAGE010
for the storage pore adsorption time; The open space adsorption time is a few minutes, and the storage pore adsorption time is a couple of days; much larger than ;
Figure 2013103944231100001DEST_PATH_IMAGE012
(5), according to the test of methane isothermal adsorption, obtain adsorption equilibrium pressure and open and close the pore volume relational expression:
In formula,
Figure 2013103944231100001DEST_PATH_IMAGE014
for particle storage pore volume;
Figure 2013103944231100001DEST_PATH_IMAGE016
for particle surface methane adsorption volume; for contactor free gas volume;
Figure 2013103944231100001DEST_PATH_IMAGE020
for the particulate samples quality;
Figure 2013103944231100001DEST_PATH_IMAGE022
for initial concentration of methane gas;
Figure 2013103944231100001DEST_PATH_IMAGE024
for initial methane gas pressure;
Figure 2013103944231100001DEST_PATH_IMAGE026
for methane isothermal experiment temperature;
Figure 2013103944231100001DEST_PATH_IMAGE028
for the Boltzmann constant;
(6) when initial concentration of methane gas , and
Figure 699713DEST_PATH_IMAGE010
much larger than ; Obtain the relational expression of methane adsorption equilibrium pressure and blind hole volume and particle surface methane adsorption volume;
Figure 2013103944231100001DEST_PATH_IMAGE032
(7) by
Figure 2013103944231100001DEST_PATH_IMAGE034
≈ 10 -3, can ignore particle surface methane adsorption volume
Figure 572040DEST_PATH_IMAGE016
; Can obtain methane adsorption equilibrium pressure and blind hole volume relationship formula:
Figure 2013103944231100001DEST_PATH_IMAGE036
(8) calculating the middle total pore size volume that produces coal is
Figure 2013103944231100001DEST_PATH_IMAGE038
;
(9) calculating the middle storage porosity that produces coal is
Figure DEST_PATH_IMAGE040
.
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CN105606703A (en) * 2016-01-28 2016-05-25 中国石油大学(华东) Calculating method and measuring device for shale adsorption gas and free gas
CN106932323A (en) * 2017-02-22 2017-07-07 中国石油大学(北京) A kind of shale gas reservoir gas effecive porosity inversion method
CN107860680A (en) * 2017-12-19 2018-03-30 武汉钢铁有限公司 A kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up
CN111608653A (en) * 2020-05-21 2020-09-01 中国石油大学(华东) Method and system for measuring gas loss of coal bed, storage medium and terminal
CN111751242A (en) * 2020-06-19 2020-10-09 中国石油天然气股份有限公司 Method for accurately measuring petroleum water saturation of shale oil and gas reservoir rock
CN112485174A (en) * 2020-10-19 2021-03-12 中国地质大学（北京） Method for calculating permeability of reservoir containing hydrate based on stacked cube model
CN113189305A (en) * 2021-04-29 2021-07-30 中国华能集团清洁能源技术研究院有限公司 Simulation method and system for porous permeable rock

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Cited By (13)

* Cited by examiner, † Cited by third party
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CN104729974A (en) * 2015-04-16 2015-06-24 中国石油大学(华东) Gasometric porosity measuring method taking temperature effect into consideration
CN105606703A (en) * 2016-01-28 2016-05-25 中国石油大学(华东) Calculating method and measuring device for shale adsorption gas and free gas
CN105606703B (en) * 2016-01-28 2018-07-31 中国石油大学(华东) The computational methods and its measuring device of shale adsorbed gas and free gas
CN106932323B (en) * 2017-02-22 2019-05-14 中国石油大学(北京) A kind of shale gas reservoir gas effecive porosity inversion method
CN106932323A (en) * 2017-02-22 2017-07-07 中国石油大学(北京) A kind of shale gas reservoir gas effecive porosity inversion method
CN107860680B (en) * 2017-12-19 2020-07-03 武汉钢铁有限公司 Analysis method for blast furnace tuyere coke granularity composition and slag retention
CN107860680A (en) * 2017-12-19 2018-03-30 武汉钢铁有限公司 A kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up
CN111608653A (en) * 2020-05-21 2020-09-01 中国石油大学(华东) Method and system for measuring gas loss of coal bed, storage medium and terminal
CN111751242A (en) * 2020-06-19 2020-10-09 中国石油天然气股份有限公司 Method for accurately measuring petroleum water saturation of shale oil and gas reservoir rock
CN111751242B (en) * 2020-06-19 2023-02-24 中国石油天然气股份有限公司 Method for accurately measuring petroleum water saturation of shale oil and gas reservoir rock
CN112485174A (en) * 2020-10-19 2021-03-12 中国地质大学（北京） Method for calculating permeability of reservoir containing hydrate based on stacked cube model
CN112485174B (en) * 2020-10-19 2021-09-14 中国地质大学（北京） Method for calculating permeability of reservoir containing hydrate based on stacked cube model
CN113189305A (en) * 2021-04-29 2021-07-30 中国华能集团清洁能源技术研究院有限公司 Simulation method and system for porous permeable rock

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