CN109655479A - A kind of coal-bed gas content analysis method based on nuclear magnetic resonance T 2 spectrum - Google Patents
A kind of coal-bed gas content analysis method based on nuclear magnetic resonance T 2 spectrum Download PDFInfo
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- CN109655479A CN109655479A CN201710942855.XA CN201710942855A CN109655479A CN 109655479 A CN109655479 A CN 109655479A CN 201710942855 A CN201710942855 A CN 201710942855A CN 109655479 A CN109655479 A CN 109655479A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
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Abstract
Disclose a kind of coal-bed gas content analysis method based on nuclear magnetic resonance T 2 spectrum.This method comprises: 1) carry out nuclear magnetic resonance physical test of rock to the full diameter coal petrography sample on unconventional stratum, the sample T2 spectrum is obtained；2) it is composed based on the sample T2 and determines movable fluid peak and constraint fluid peak；3) relationship between the closed area in constraint fluid peak and the ratio and movable fluid percentage of the closed area in movable fluid peak is established；4) by the way that the T2 spectrum of different samples to be compared with the reservoir gas-bearing amount of measurement, the relationship between movable fluid percentage and reservoir gas-bearing amount is established.The present invention discloses the unique double pores system feature of coalbed methane reservoir, proposes the key factor for determining coal petrography air content by the full diameter coal heart nuclear magnetic resonance T2 Distribution value analysis of unconventional coal bearing seams.The present invention provides foundation for Log Strata means of interpretation, and social and economic benefit is obvious.
Description
Technical field
The present invention relates to unconventional oil and gas exploration and development field, more particularly, to a kind of based on nuclear magnetic resonance T 2 spectrum
Coal-bed gas content analysis method.
Background technique
Compared with the reservoirs such as traditional sandstone, the coal petrography on unconventional stratum has complicated non-linearly matter geophysical response
Relationship characteristic, conventional reservoir rock physics identifying and analyzing method, evaluation model are uncomfortable in the identification and evaluation of unconventional reservoir
With unconventional stratum corresponds to coal petrography nuclear magnetic resonance Rock physical analysis and faces problems and challenge, is still in exploration both at home and abroad
Stage.Therefore, it is necessary to develop a kind of unconventional stratum coal petrography nmr analysis.
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
Compared with conventional reservoir, there are unconventional coal bearing seams Complicated Pore Structures and heterogeneous geophysical log to respond
Feature.It is responded based on unconventional full diameter coal petrography nuclear magnetic resonance physical test of rock, it is special to extract coal bearing seams nuclear magnetic resonance T 2 spectrum
Sign discloses the unique double pores system feature of coalbed methane reservoir using T2 Distribution value, proposes the key for determining coal petrography air content
Factor provides foundation for the foundation of coalbed methane reservoir log interpretation method.
Coal-bed gas content analysis method according to the present invention based on nuclear magnetic resonance T 2 spectrum includes:
1) nuclear magnetic resonance physical test of rock is carried out to the full diameter coal petrography sample on unconventional stratum, obtains the sample T2
Spectrum；
2) it is composed based on the sample T2 and determines movable fluid peak and constraint fluid peak；
3) ratio and movable fluid percentage of constraint fluid peak closed area and the closed area in movable fluid peak are established
Relationship between number；
4) by the way that the T2 of different samples spectrum is compared with the reservoir gas-bearing amount of measurement, establish movable fluid percentage and
Relationship between reservoir gas-bearing amount.
Preferably, after carrying out soaked processing to the full diameter coal petrography sample on unconventional stratum and reach saturation, nuclear-magnetism is carried out
Resonate physical test of rock.
Preferably, two peak structure feature is presented when the sample T2 is composed, left peak is constraint fluid peak, and right peak is movable fluid
Peak.
Preferably, the ratio and movable fluid percentage of constraint fluid peak closed area and the closed area in movable fluid peak
It is positively correlated between number.
Preferably, negatively correlated between movable fluid percentage and reservoir gas-bearing amount.
Preferably, the coal-bed gas content analysis method according to the present invention based on nuclear magnetic resonance T 2 spectrum further includes establishing movably
Relationship between the closed area in fluid peak and reservoir gas-bearing amount.
Preferably, negatively correlated between the closed area in movable fluid peak and reservoir gas-bearing amount.
Preferably, the coal-bed gas content analysis method according to the present invention based on nuclear magnetic resonance T 2 spectrum further includes establishing constraint
Relationship between the closed area in fluid peak and reservoir gas-bearing amount.
Preferably, it is positively correlated between the closed area in the constraint fluid peak and reservoir gas-bearing amount.
The present invention discloses coal bed gas storage by the full diameter coal heart nuclear magnetic resonance T2 Distribution value analysis of unconventional coal bearing seams
The unique double pores system feature of layer, proposes the key factor for determining coal petrography air content.The present invention is Log Strata explanation side
Method provides foundation, and social and economic benefit is obvious.
Methods and apparatus of the present invention has other characteristics and advantages, these characteristics and advantages are attached from what is be incorporated herein
It will be apparent in figure and subsequent specific embodiment, or will be in the attached drawing and subsequent specific implementation being incorporated herein
It is stated in detail in example, these the drawings and specific embodiments 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 coal-bed gas content analysis method based on nuclear magnetic resonance T 2 spectrum of exemplary implementation scheme according to the present invention
Flow chart；
Fig. 2 is the T2 spectrum of the area 15 Y coal seam 3-1 sample；
Fig. 3 is the T2 spectrum of the area 15 Y coal seam 3-2 sample；
Fig. 4 a is the T2 spectrum of the area 5 Y coal seam 3-3 sample, and Fig. 4 b is the T2 spectrum of the area 5 Y coal seam 3-4 sample；
Fig. 5 a is the T2 spectrum of the area 15 the Y coal seam 3-1 sample comprising coal seam reservoirs air content, and Fig. 5 b is to contain comprising coal seam reservoirs
The T2 spectrum of the area 15 the Y coal seam 3-2 sample of tolerance.
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.
With reference to the coal seam gassiness based on nuclear magnetic resonance T 2 spectrum of Fig. 1 detailed description in accordance with an exemplary embodiment of the invention
Analysis method.This method specifically includes that
Step 1: nuclear magnetic resonance physical test of rock being carried out to the full diameter coal petrography sample on unconventional stratum, obtains the sample
Product T2 spectrum.
In one example, after carrying out soaked processing to the full diameter coal petrography sample on unconventional stratum and reach saturation, into
Row nuclear magnetic resonance physical test of rock.
Step 2: being composed based on the sample T2 and determine movable fluid peak and constraint fluid peak.
The T2 spectrum of unconventional coal bearing seams sample is in two peak structure feature, discloses the unique basis of dual porosity knot of coalbed methane reservoir
Structure structure feature.It is compared with conventional low porosity permeability reservoir, has apparent interval between peak value, illustrate that its constraint cannot have with movable fluid
Effect is linked up.
When the sample T2 is composed, and two peak structure feature is presented, left peak is constraint fluid peak, and right peak is movable fluid peak.Such as
Shown in Fig. 2, for curve after saturation, left peak can be determined as constraint fluid peak, right peak is movable fluid peak.
Step 3: establishing the ratio and movable fluid of constraint fluid peak closed area and the closed area in movable fluid peak
Relationship between percentage.
It fetters between the closed area in fluid peak and the ratio and movable fluid percentage of the closed area in movable fluid peak
It is positively correlated.The ratio for fettering the closed area in fluid peak and the closed area in movable fluid peak is smaller, reflects movable fluid hundred
Score is smaller, shows that seepage flow interstitial space is smaller, fluid ability is poorer.The comparison composed by the T2 of Fig. 2 and Fig. 3, also illustrates
The conclusion is accurate.
Step 4: by the way that the T2 spectrum of different samples to be compared with the reservoir gas-bearing amount of measurement, establishing movable fluid percentage
Relationship between several and reservoir gas-bearing amount.
By the way that the T2 spectrum of different samples is compared with the reservoir gas-bearing amount of measurement it is found that movable fluid percentage and storage
It is negatively correlated between layer air content.Pass through the comparison of the T2 spectrum of the T2 of Fig. 4 a and Fig. 4 the b comparison and Fig. 5 a and Fig. 5 b composed, verifying
The conclusion is accurate.
In one example, the relationship between the closed area in movable fluid peak and reservoir gas-bearing amount has been also set up, specifically
Ground is between the two negative correlation.The comparison composed by the T2 of Fig. 4 a and Fig. 4 b, it is accurate for demonstrating the conclusion.
In one example, the relationship between the closed area in constraint fluid peak and reservoir gas-bearing amount has been also set up, specifically
Ground is between the two positive correlation.The comparison composed by the T2 of Fig. 5 a and Fig. 5 b, it is accurate for demonstrating the conclusion.
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 (9)
1. a kind of coal-bed gas content analysis method based on nuclear magnetic resonance T 2 spectrum characterized by comprising
1) nuclear magnetic resonance physical test of rock is carried out to the full diameter coal petrography sample on unconventional stratum, obtains the sample T2 spectrum；
2) it is composed based on the sample T2 and determines movable fluid peak and constraint fluid peak；
3) establish the closed area in constraint fluid peak and the closed area in movable fluid peak ratio and movable fluid percentage it
Between relationship；
4) by the way that the T2 spectrum of different samples to be compared with the reservoir gas-bearing amount of measurement, movable fluid percentage and reservoir are established
Relationship between air content.
2. the coal-bed gas content analysis method according to claim 1 based on nuclear magnetic resonance T 2 spectrum, wherein to different coal petrographys
After the full diameter coal petrography sample on stratum carries out soaked processing and reaches saturation, nuclear magnetic resonance physical test of rock is carried out.
3. the coal-bed gas content analysis method according to claim 1 based on nuclear magnetic resonance T 2 spectrum, wherein when the sample
Two peak structure feature is presented in T2 spectrum, and left peak is constraint fluid peak, and right peak is movable fluid peak.
4. the coal-bed gas content analysis method according to claim 1 based on nuclear magnetic resonance T 2 spectrum, wherein constraint fluid peak
It is positively correlated between the ratio and movable fluid percentage of the closed area of closed area and movable fluid peak.
5. the coal-bed gas content analysis method according to claim 1 based on nuclear magnetic resonance T 2 spectrum, wherein movable fluid hundred
It is negatively correlated between score and reservoir gas-bearing amount.
6. the coal-bed gas content analysis method according to claim 1 based on nuclear magnetic resonance T 2 spectrum further includes establishing movably
Relationship between the closed area in fluid peak and reservoir gas-bearing amount.
7. the coal-bed gas content analysis method according to claim 6 based on nuclear magnetic resonance T 2 spectrum, wherein movable fluid peak
It is negatively correlated between closed area and reservoir gas-bearing amount.
8. the coal-bed gas content analysis method according to claim 1 based on nuclear magnetic resonance T 2 spectrum further includes establishing constraint
Relationship between the closed area in fluid peak and reservoir gas-bearing amount.
9. the coal-bed gas content analysis method according to claim 8 based on nuclear magnetic resonance T 2 spectrum, wherein the constraint stream
It is positively correlated between the closed area in body peak and reservoir gas-bearing amount.
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Cited By (1)
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| CN115931949A (en) * | 2022-10-11 | 2023-04-07 | 中国矿业大学 | Method for improving coal bed gas recovery ratio by quantitatively evaluating gas injection |
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