CN106290056A - The characterizing method of shale solid and gas ability in the evaluation of shale gas preservation condition - Google Patents
The characterizing method of shale solid and gas ability in the evaluation of shale gas preservation condition Download PDFInfo
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- CN106290056A CN106290056A CN201510319691.6A CN201510319691A CN106290056A CN 106290056 A CN106290056 A CN 106290056A CN 201510319691 A CN201510319691 A CN 201510319691A CN 106290056 A CN106290056 A CN 106290056A
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Abstract
The present invention relates to oil-gas geology field shale gas preservation condition assessment technique, it is specifically related to the characterizing method of shale solid and gas ability during a kind of shale gas preservation condition is evaluated, the step of described method includes: 1) choose shale samples, carry out adsorption isotherm experiment, it is thus achieved that the true adsorbance of natural gas under experimental temperature, pressure condition；2) with step 1) described in isotherm adsorption data accorded calculate sample adsorbance under experimental temperature, pressure condition, calculate the adsorption space that occupies of adsorbed gas；3) measure pore volume and the quality of shale samples, calculate the pore volume of sample；4) the solid and gas index of shale samples is calculated；5) the solid and gas effect to described shale samples is evaluated.
Description
Technical field
The invention belongs to oil-gas geology field.The table of shale solid and gas ability in providing a kind of shale gas preservation condition to evaluate
Levy method.
Background technology
Shale gas preservation condition is one of content indispensable in shale gas evaluation study.Bar is preserved at shale gas
In the work of part evaluation study, on the one hand use for reference and the preservation condition evaluation methodology of application conventional gas and oil, lay particular emphasis on page
The top board of rock gas bearing interval, base plate Capped Ability research, and the lateral Sealing Conditions of shale gas bearing interval comment
Valency, from structural environment, hydrogeologic condition, natural gas constituent and isotope analysis test data thereof, with
And the aspect such as top board and the thickness of base plate, fragility, lithology, micropore structure is evaluated research, this grind
The method studying carefully thinking and employing is of value to the objective evaluation of shale gas preservation condition.On the other hand, numerous scholars
It is also recognized that owing to the occurrence status of shale gas has free state, ADSORPTION STATE and the dissolved, this is natural with routine
Gas reservoir tool makes a big difference, and the especially natural gas of ADSORPTION STATE accounting in shale reaches 20-80%.Accordingly,
Li Shizhen (2013, Geological Bulletin of China, the 9th phase of volume 32, China's shale gas geologic survey evaluation study present situation
With existing problems) to emphasize, tectonic activity causes the Temperature-pressure Conditions on stratum to change, and the foramen primum fissure system of shale meets with
To destroying, break the balance of adsorbed gas and free gas, affected shale gas and preserve.Li Zhongyang thinks (shale gas
Become that hides to preserve and preservation condition research), preservation condition such as trap, cap rock etc. needed for Shale Gas Accumulation are more
Loosely, do not have conventional oil gas-bearing formation the strictest.(inland river science and technology, the 2nd phase in 2011, shale gas became Huang Fei etc.
Hide geological condition analysis) emphasize, even if shale gas reservoir is destroyed by tectonic movement, adsorbed gas still can preserve
Getting off, compared with normal gas pools, preservation condition is required relatively low by shale gas reservoir.Li Denghua etc. (2009, natural
Gas industry, shale gas reservoir Formation Conditions) also there is similar viewpoint.Above-mentioned viewpoint is from shale gas occurrence status
Characteristic is set out, and the preservation condition analyzing shale gas meets objective reality.It is presently believed that why shale
Gas becomes to hide preservation condition requirement on the low side, is because adsorbed gas in shale gas and occupies certain proportion, and shale is to natural
Gas has certain " solid and gas " to act on, and prevents the diffusion of shale gas, seepage flow and loss.But at present for shale
This solid and gas effect still there is no the characterizing method of operability, it is impossible to meet the need that shale gas preservation condition is evaluated
Want.
Summary of the invention
It is an object of the invention to, for characteristic and the multifarious feature of shale gas occurrence status of mud shale,
Shale solid and gas capability representation method in research a kind of shale gas preservation condition evaluation, evaluates for shale gas preservation condition
New method and new approaches are provided.
The present invention relates to the characterizing method of shale solid and gas ability, described side during a kind of shale gas preservation condition is evaluated
The step of method includes:
1) choose shale samples, carry out adsorption isotherm experiment, it is thus achieved that natural under experimental temperature, pressure condition
The true adsorbance of gas；
2) with step 1) described in true adsorbance calculate sample adsorption space；
3) measure pore volume and the quality of shale samples, calculate the pore volume of sample；
4) the solid and gas index of shale samples is calculated；
5) the solid and gas effect to described shale samples is evaluated.
In a preferred embodiment of the present invention, described step 2) in described adsorbance, it calculates public affairs
Formula is ω=V*M/ ρab；
Wherein, ω is adsorption space, and its unit is cm3/g；
V is shale samples true adsorbance of methane under experimental temperature, under pressure, and its unit is m3/ t or
mol/g；
M is the molal weight of methane；
ρabIt it is the absorption phase density of methane.
In a preferred embodiment of the present invention, described ρabComputing formula be ρab=
ρb/exp[0.0025(T-Tb)]；
Wherein, ρbIt is methane density at the boiling point；
T is the absolute temperature of system, and its unit is K；
TbBoiling temperature for methane.
In a preferred embodiment of the present invention, described step 3) in described pore volume, its computing formula
For D=VHole/G；
Wherein, D is pore volume, and its unit is m3/t；
G is the quality of shale samples, and its unit is t；
VHoleFor the pore volume of shale samples, its unit is m3。
In a preferred embodiment of the present invention, described step 4) in solid and gas index, its computing formula
For B=ω/D；
Wherein, B is solid and gas index, without unit dimension；
ω is adsorption space, and its unit is cm3/g；
D is pore volume, and its unit is m3/t。
Beneficial effects of the present invention: establish shale solid and gas index calculation method and flow process, can be to shale solid and gas
Ability is carried out quickly, directviewing description and analysis, preserves evaluation study for shale gas and provides new method and new approaches.
Accompanying drawing explanation
Fig. 1 is the shale samples solid and gas effect plate of the present invention.
Fig. 2 is the solid and gas effect overall merit plate of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in detail, it will be appreciated that the scope of the present invention does not limit
In these embodiments.Embodiments of the invention are as follows:
Embodiment 1
Select No. 1 shale samples of southeast, river X well, carry out isothermal adsorption test.Obtain this shale in pressure
The true adsorbance of methane under power 11.01MPa, temperature 60 C, for 58.48mol/t.
Use formula ρab=ρb/exp[0.0025(T-Tb)] the absorption phase density that calculates methane is 0.2436g/cm3；
Use formula ω=V*M/ ρabThe adsorption space calculating shale samples is 0.0038cm3/g；
Use formula D=VHoleIt is 0.0047cm that/G calculates the pore volume of shale samples3/g；
The solid and gas index using formula B=ω/D to calculate shale samples is 0.81.
Embodiment 2
Select No. 2 shale samples of southeast, river X well, carry out isothermal adsorption test.Obtain this shale in pressure
The true adsorbance of methane under power 10.1MPa, temperature 60 C, for 105.80mol/t.
Use formula ρab=ρb/exp[0.0025(T-Tb)] the absorption phase density that calculates methane is 0.2436g/cm3；
Use formula ω=V*M/ ρabThe adsorption space calculating shale samples is 0.0069cm3/g；
Use formula D=VHoleIt is 0.0088cm that/G calculates the pore volume of shale samples3/g；
The solid and gas index using formula B=ω/D to calculate shale samples is 0.78.
Embodiment 3
Select the shale samples of southeast, river Y well, carry out isothermal adsorption test.Obtain this shale at pressure
The true adsorbance of methane at 10.1MPa, temperature 30 DEG C, for 113.86mol/t.
Use formula ρab=ρb/exp[0.0025(T-Tb)] the absorption phase density that calculates methane is 0.2626g/cm3；
Use formula ω=V*M/ ρabThe adsorption space calculating shale samples is 0.0069cm3/g；
Use formula D=VHoleIt is 0.0108cm that/G calculates the pore volume of shale samples3/g；
The solid and gas index using formula B=ω/D to calculate shale samples is 0.64.
Embodiment 4
Drawing shale samples solid and gas effect plate, four straight lines (from top to bottom) in plate can be respectively with ω=1
× D, ω=0.75 × D, ω=0.5 × D, ω=0.25 × D represent, four straight lines can draw on plate
Go out 4 regions (A, B, C, D).The solid and gas index of region A, between 0.75-1.0, represents and falls into this
Its solid and gas ability of the sample in region is strong, preserves most beneficial for shale gas；The solid and gas index of region B is at 0.5-0.75
Between, represent that its solid and gas ability of sample falling into this region is relatively strong, advantageous in shale gas preservation；Region C's
Solid and gas index, between 0.25-0.5, represents that its solid and gas ability of sample falling into this region is medium, and shale gas preserves
Condition is medium；The solid and gas index of region D is less than 0.25, represents that its solid and gas ability of sample falling into this region is weak,
Shale gas preservation condition is poor.No. 1 of X well, No. 2 shale samples in above-described embodiment, its solid and gas index is the biggest
In 0.75, each fall within the A district of plate, and the solid and gas index of Y well shale samples is 0.64, falls into the B of plate
District.
As can be seen here, the solid and gas index of the shale samples of X well is the biggest, falls into the A district that solid and gas effect is strong, instead
The shale reflecting X well has strong solid and gas ability to function, the beneficially preservation of shale gas.And actual production test table
Bright, although the shale interval of X well experienced by ta ctonic reworking in earth history, and have the lifting time early,
The feature that uplift scope is big and deformation intensity is higher, at present more than daily output shale gas 10,000 side it was confirmed X well
Shale there is good preservation condition really；Its solid and gas index of the shale samples of Y well is 0.64, less than X well
Solid and gas index, other data displays that the gas-bearing property of Y well is poor, is widely considered to be what preservation condition difference caused.
Described above this patent is suitable, effective with the method for solid and gas index assessment shale gas preservation condition.
Solid and gas effect plate combines mud logging and other logging data application, can set up shale solid and gas effect overall merit
Plate (Fig. 2).The way of Fig. 2 is: after solid and gas effect plate completes, according to well depth position residing for sample
Mud logging total hydrocarbon content, methane relative amount detection data, solid and gas effect plate is moved on to total hydrocarbon and contains with methane
In the plate that amount is constituted, form solid and gas effect overall merit plate, to reach multiparameter, directly perceived, quickly to page
The comparison of rock solid and gas ability to function and the purpose of evaluation.As in figure 2 it is shown, sample 4 and sample 5 are in solid and gas effect
Being in A district in plate, solid and gas index is 0.76, sample 4 compared with sample 5, total hydrocarbon content is identical,
But the methane content of sample 4 is apparently higher than sample 5, illustrate that the comprehensive solid and gas ability of sample 4 is better than sample 5.
Claims (5)
1. a characterizing method for shale solid and gas ability, the step of described method during shale gas preservation condition is evaluated
Including:
1) choose shale samples, carry out adsorption isotherm experiment, it is thus achieved that natural under experimental temperature, pressure condition
The true adsorbance of gas；
2) with step 1) described in true adsorbance calculate sample adsorption space；
3) measure pore volume and the quality of shale samples, calculate the pore volume of sample；
4) the solid and gas index of shale samples is calculated；And
5) the solid and gas ability to function of described shale samples is evaluated.
Method the most according to claim 1, it is characterised in that described step 2) in described absorption
Amount, its computing formula is ω=V*M/ ρab；
Wherein, ω is adsorption space, and its unit is cm3/g；
V is shale samples true adsorbance of methane under experimental temperature, under pressure, and its unit is m3/ t or
mol/g；
M is the molal weight of methane；
ρabIt it is the absorption phase density of methane.
Method the most according to claim 2, it is characterised in that described ρabComputing formula be ρab=
ρb/exp[0.0025(T-Tb)]；
Wherein, ρbIt is methane density at the boiling point；
T is the absolute temperature of system, and its unit is K；
TbBoiling temperature for methane.
4. according to the method described in any one in claim 1-3, it is characterised in that described step 3)
In described pore volume, its computing formula is D=VHole/G；
Wherein, D is pore volume, and its unit is m3/t；
G is the quality of shale samples, and its unit is t；
VHoleFor the pore volume of shale samples, its unit is m3。
5. according to the method described in any one in claim 1-4, it is characterised in that described step 4)
In solid and gas index, its computing formula is B=ω/D；
Wherein, B is solid and gas index, without unit dimension；
ω is adsorption space, and its unit is cm3/g；
D is pore volume, and its unit is m3/t。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411848A (en) * | 2013-07-25 | 2013-11-27 | 中国石油大学(华东) | Method used for evaluating shale gas adsorption capacity of shale |
| CN103940722A (en) * | 2014-04-30 | 2014-07-23 | 东北大学 | Device and method for testing porosity and adsorption parameters of gas-bearing shale |
| CN103994960A (en) * | 2014-05-23 | 2014-08-20 | 中国石油大学(北京) | Coal/shale isothermal adsorption experiment method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411848A (en) * | 2013-07-25 | 2013-11-27 | 中国石油大学(华东) | Method used for evaluating shale gas adsorption capacity of shale |
| CN103940722A (en) * | 2014-04-30 | 2014-07-23 | 东北大学 | Device and method for testing porosity and adsorption parameters of gas-bearing shale |
| CN103994960A (en) * | 2014-05-23 | 2014-08-20 | 中国石油大学(北京) | Coal/shale isothermal adsorption experiment method |
Non-Patent Citations (3)
| Title |
|---|
| SENTARO OZAWA 等: "Physical Adsorption of Gases at High Pressure IV. An Improvement of the Dubinin-Astakhov Adsorption Equation", 《JOURNAL OF COLLOID AND INTERFACE SCIENCE》 * |
| SHANGBIN CHEN 等: "Reservoir evaluation of the Lower Silurian Longmaxi Formation shale gas in the southern Sichuan Basin of China", 《MARINE AND PETROLEUM GEOLOGY》 * |
| 苏现波 等: "吸附势理论在煤层气吸附/解吸中的应用", 《地质学报》 * |
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