CN110456414A - Mining area stress direction evaluation method - Google Patents
Mining area stress direction evaluation method Download PDFInfo
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- CN110456414A CN110456414A CN201910772022.2A CN201910772022A CN110456414A CN 110456414 A CN110456414 A CN 110456414A CN 201910772022 A CN201910772022 A CN 201910772022A CN 110456414 A CN110456414 A CN 110456414A
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- 238000005065 mining Methods 0.000 title claims abstract description 20
- 238000011156 evaluation Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 241000220317 Rosa Species 0.000 claims description 16
- 238000010586 diagram Methods 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 52
- 238000013461 design Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006355 external stress Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/288—Event detection in seismic signals, e.g. microseismics
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Acoustics & Sound (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Business, Economics & Management (AREA)
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Abstract
The embodiment of the invention provides a kind of mining area stress direction evaluation methods.The described method includes: carrying out micro-seismic monitoring to test block；Record microseism simultaneously carries out seismic source location；The focal mechanism of qualified focus is made, source character and focus fracture orientation are parsed；By determining the trend in focus crack, orientation of principal stress is determined.Stress direction evaluation method in mining area provided in an embodiment of the present invention uses the corresponding relationship in focus crack and stress field, using statistics extensional focus crack, slip of inclining focus crack, the stress direction of monitoring section is provided, it is at low cost, test result coverage area is big, representative strong.
Description
Technical field
The present invention relates to microseismic fields, more particularly to a kind of mining area stress direction evaluation method.
Background technique
Oil field, Course of Mining, it is understood that local stress direction, oily to design the FRACTURING DESIGN of science
Well pattern of well；Design the mining tunnel of stable safety.Stress direction test is usually relatively complex: scene uses
Small scale fracturing, interior is using sound emission, difference strain；At high cost, test result coverage area is small, representative poor.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of mining area stress direction evaluation methods, can accurately provide monitoring
The stress direction in area.
In order to solve the above technical problems, the present invention provides a kind of mining area stress direction evaluation methods, which comprises
Micro-seismic monitoring is carried out to test block；Record microseism simultaneously carries out seismic source location；Make the focal mechanism of qualified focus, parsing shake
Source property and focus fracture orientation；By determining the trend in focus crack, test block orientation of principal stress is determined.
In some embodiments, by determining the trend in focus crack, orientation of principal stress is determined, comprising:
Make focus fracture strike rose；The predominant direction that focus fracture strike rose provides is focus fracture strike,
It is orientation of principal stress.
In some embodiments, the focal mechanism includes: extensional focal mechanism, sliding focal mechanism of inclining and walks sliding focus
Mechanism.
In some embodiments, focus fracture strike rose is made, comprising: the focus for making opening mode earthquake is split
Seam moves towards rose, includes extensional focus crack and sliding focus crack of inclining.
In some embodiments, the predominant direction that focus fracture strike rose provides is focus fracture strike,
It is orientation of principal stress, comprising: the predominant direction that the focus fracture strike rose of opening mode earthquake provides is shake
Source fracture strike, that is, test block orientation of principal stress.
By adopting such a design, the present invention has at least the following advantages:
Using statistics extensional focus crack, slip of inclining focus crack, the stress direction of monitoring section is provided, at low cost, test
As a result coverage area is big, representative strong.
Detailed description of the invention
The above is merely an overview of the technical solutions of the present invention, in order to better understand the technical means of the present invention, below
In conjunction with attached drawing, the present invention is described in further detail with specific embodiment.
Fig. 1 is the flow diagram of stress direction evaluation method in mining area provided in an embodiment of the present invention；
Fig. 2 is the rose in mining area provided in an embodiment of the present invention.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
The present invention propose one with micro-seismic monitoring as a result, analysis focal mechanism, provide maximum horizontal principal stress method,
Technology.This method, technology, using the corresponding relationship in focus crack and stress field, using statistics extensional focus crack, incline sliding focus
Crack provides the stress direction of monitoring section, and at low cost, test result coverage area is big, representative strong.
The patent that focal mechanism is this patent presenter is made with ground micro-seismic, as amplification, this patent is proposed: using
Extensional, incline sliding microseism focal mechanism distribution and the determining research area's orientation of principal stress of feature.
Focal mechanism method of the microseism in mining area can provide source character, and focus crack (violent earthquake is known as tomography) is walked
To；Source character can be divided into three classes: walk sliding microseism, sliding microseism of inclining, extensional microseism.
1, the focus advantage fractuer direction of extensional microseism is along orientation of principal stress.
Extensional microseism focal mechanism is that occur under oil field fracturing, water filling, special mankind's construction background such as coal mining
A kind of focal mechanism, with explosion formed focal mechanism it is identical.Fracture surface (violent earthquake claims fault plane) on fracture surface along making
It opens in the direction of minimum stress.Occur extensional earthquake be internal pressure, compared with external stress as a result, internal pressure is fluid pressure
Power, respectively to equivalence；The smallest direction of external action stress, the probability that extensional earthquake occurs are bigger.Minimum horizontal principal stress is most
Small external stress, the probability that extensional earthquake occurs along minimum horizontal principal stress direction are also maximum.When fracture surface normal direction is in water
When plane projection direction is along minimum horizontal principal stress direction, normal stress is minimum, and the probability that extensional earthquake occurs is maximum.It is theoretical
Analysis, monitoring practice have shown that, such focus crack long axis is generally along direction of maximal stress, and fracture surface is along minimum stress direction
It opens.The long axis (fracture strike) that fracture surface projects in the horizontal plane most easily occurs along the crack of orientation of principal stress
Extensional sliding is shaken although inaccuracy is moved towards along orientation of principal stress in original fracture face by numerous extensional microseisms
The predominant direction that source mechanism fracture strike counts indicates orientation of principal stress.
2, incline sliding microseism focus advantage fractuer direction along orientation of principal stress.
It sliding microseism focal mechanism of inclining and walks sliding microseism focal mechanism and has identical Mechanics Cause, and in biaxial stress
Opposite sliding occurs along fracture surface under effect.But the biaxial stress for inducing sliding microseism of inclining is that vertical stress and fracture surface move towards
Vertical horizontal stress；Difference is bigger, and the probability for sliding microseism of inclining is higher.The smallest horizontal stress is minimum level
At this moment principal stress acts on the vertical stress and horizontal stress difference maximum on fracture surface.This makes sliding microseism focus crack of inclining
Trend tends to along orientation of principal stress.Although original fracture inaccuracy along orientation of principal stress, by
The predominant direction that sliding microseism fracture strike counts that largely inclines should indicate orientation of principal stress.
Oil field fracturing, the inducible strata pressure of water filling increase, original place effective stress reduces；Cave-in areas, stratum occur
The sliding of normal fault property.Original strata stress can also be made to reduce；These are that we are micro- in oil field, Mine Monitoring to extensional, cunning of inclining
The reason of earthquake.
Understand stress direction safety of coal mines is exploited it is significant: can rationally design roadway direction, prediction rock burst,
It collapses and position, the predominant direction of Gas Outburst occurs.In the past, it was provided with the stress direction that other methods obtain coal mine local location
Material needs writing investment and complicated construction.Stress direction is obtained by focal mechanism method, simple, easy, covering surface is big, is one
A method for being worthy to be popularized, using.Fig. 2 is the practical Shanxi somewhere orientation of principal stress rose provided by focal mechanism
Figure, about 55 degree of east northeast, it is consistent with the stress direction that other methods obtain.
Fig. 1 shows the flow chart of stress direction evaluation method in mining area provided in an embodiment of the present invention.Referring to Fig. 1, mining area
Stress direction evaluation method includes:
S11 carries out micro-seismic monitoring to test block.
S12 records microseism and carries out seismic source location.
S13 makes the focal mechanism of qualified focus, marks source character and focus fracture orientation.
S14 makes extensional earthquake and the sliding focus fracture strike rose that inclines.
S15, the predominant direction that rose provides are focus fractuer direction and orientation of principal stress.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, this
Field technical staff makes a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all falls within this hair
In bright protection scope.
Claims (5)
1. a kind of mining area stress direction evaluation method characterized by comprising
Micro-seismic monitoring is carried out to test block；
Record microseism simultaneously carries out seismic source location；
The focal mechanism of qualified focus is made, source character and focus fracture orientation are parsed；
By determining the trend in focus crack, orientation of principal stress is determined.
2. stress direction evaluation method in mining area according to claim 1, which is characterized in that by determining that opening mode focus is split
The trend of seam, determines orientation of principal stress, comprising:
Make opening mode focus fracture strike rose, wherein opening mode focus crack includes extensional fracture and cunning of inclining
Crack；
The predominant direction that opening mode focus fracture strike rose provides is focus fracture strike and maximum horizontal principal stress
Direction.
3. stress direction evaluation method in mining area according to claim 1, which is characterized in that parsed by the focal mechanism
Method can parse all slits are as follows: extensional focus crack inclines and sliding focus crack and walks sliding focus crack.
4. stress direction evaluation method in mining area according to claim 2, which is characterized in that make focus fracture strike rose
Floral diagram, comprising:
Make the focus fracture strike rose of opening mode earthquake, including extensional focus crack and sliding focus crack of inclining.
5. stress direction evaluation method in mining area according to claim 2, which is characterized in that focus fracture strike rose
The predominant direction provided is focus fracture strike and orientation of principal stress, comprising:
The predominant direction that the focus fracture strike rose of opening mode earthquake provides is focus fracture strike, that is, test block
Orientation of principal stress.
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| CN201910772022.2A CN110456414A (en) | 2019-08-21 | 2019-08-21 | Mining area stress direction evaluation method |
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| CN201910772022.2A CN110456414A (en) | 2019-08-21 | 2019-08-21 | Mining area stress direction evaluation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113703047A (en) * | 2021-09-18 | 2021-11-26 | 中国石油大学(华东) | Method, device and storage medium for predicting horizontal ground stress difference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113703047B (en) * | 2021-09-18 | 2024-04-09 | 中国石油大学(华东) | Method, device and storage medium for predicting horizontal ground stress difference |
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Application publication date: 20191115 |