CN106529762A - New mine coal and gas outburst risk assessment method - Google Patents
New mine coal and gas outburst risk assessment method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 262
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012502 risk assessment Methods 0.000 title claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 15
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- 238000007710 freezing Methods 0.000 claims description 18
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- 239000007921 spray Substances 0.000 claims description 18
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- 238000009792 diffusion process Methods 0.000 claims description 13
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- 238000007906 compression Methods 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims description 8
- 238000009933 burial Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000004451 qualitative analysis Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003795 desorption Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
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- 238000005259 measurement Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 15
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- 241000208340 Araliaceae Species 0.000 description 4
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 4
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- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 241001045988 Neogene Species 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
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Abstract
The invention provides a new mine coal and gas outburst risk assessment method. As the new mine coal outburst risk assessment lacks theoretical bases and reasonable operation methods, according to the gas geological theory, the deposition theory and the outburst risk measurement means, the comprehensive assessment is achieved by sequentially carrying out steps of adjacent mine outburst disaster situation of the new mine, new mine gas geological conditions, new mine area coal series strata sequence stratigraphic division, ground drilling determination of coal structure, solid coefficient, ground stress, gas content, nozzle hole blocking drilling tool information during drilling in the ground well and the like. The invention solves the problem of the theoretic basis for the new mine coal and gas outburst risk assessment, and provides the complete assessment process and method.
Description
Technical field
The present invention relates to mine gas prevention and control field, more particularly to a kind of New Built Mine coal and gas prominent risk assessment
Method.
Background technology
China is big coal country in the world, while and one of the severeest country of safety of coal mines situation.1976 extremely
Between 31 years in 2006, every year because the death toll of coal mining accident is all more than 4500 people, numeral is startling for China；Nearly 6 years
Coal mining accident is significantly reduced, and dead 1384 people of coal mining accident in 2012, control coal mining accident achieve noticeable achievement, but situation is still tight
It is high, it is also very bigger than gap with developed country.Coal and gas prominent accident is a kind of main form of expression of coal mining accident, and shadow
The factor of sound is the most complicated, a kind of gas accident that difficulty of prevention and cure is maximum, is exactly always emphasis and difficult point that colliery is taken precautions against natural calamities；With opening
The increasing of depth is adopted, the threat of coal and gas prominent presents trend serious all the more.
According to incompletely statistics, national colliery in recent years per annual occur it is larger more than (once more than dead 3 people) coal with
Gas burst accident 29 or so, and not think before there is the exploitation of a large amount of mines be projecting mine, but capital construction during occur
Coal and gas prominent accident, causes a large amount of economic losses, casualties.Therefore it is badly in need of a kind of New Built Mine coal and gas prominent danger
Dangerous appraisal procedure.
The content of the invention
In order to overcome above-mentioned deficiency of the prior art, it is an object of the present invention to provide a kind of New Built Mine coal with watt
This outburst hazard appraisal procedure, it is characterised in that：Comprise the following steps：
The step of assessment result is A includes：A situation arises to collect neighbouring New Built Mine periphery gas, outburst hazard ginseng
Number situation, implements drilling spray orifice situation, bit freezing situation, and carries out New Built Mine outburst hazard analogy assessment, and then carry out new
Build mine outburst danger analogy assessment；Dangerous parameter includes：Coal Pore Structure, coal body solid coefficient, Methane Diffusion initial velocity
Degree △ p, gas bearing capacity, gas pressure, Desorption Index for Drill Cuttings；This step is mainly entered by New Built Mine adjacent periphery mine situation
The qualitative analogy assessment of row New Built Mine outburst hazard, assessment result is A；
The step of assessment result is B includes：New Built Mine region and mine shaft geology deposition, construction data is collected, analysis is new
Geological environment residing for mine is built, and outburst hazard theoretical appraisal is carried out according to coalbed gas geology theory；Wherein, depositional and burial history, structure
Make Evolutionary History, thermal evolution history, the space-time configuring area of hydrocarbon history and determine the distribution of coal and gas prominent regional space, the space-time is matched somebody with somebody
Putting region includes heavily stressed distributed areas, the region that gas generation condition is good and sealing condition is good, and coal measure strata is crushed and then belonged to
In outburst hazard region；This step carries out qualitative analysis according to coalbed gas geology theory and determines that New Built Mine projects probability of happening,
Assessment result is B；
The step of assessment result is C includes：According to New Built Mine coal measure strata data, carry out coal measure strata depositional sequence and draw
Point, Coal Seam Outburst Hazard Severity is carried out according to each coal seam in SEQUENCE STRATIGRAPHIC position；When geological structure, coal body go bad
Under degree same case, sedimentary system, stratigraphic sequence position decide coal seam thickness, roof and floor lithologic, ocurrence of coal seam situation, more
The general face position in system tract most sea (lake) is invaded near sea (lake), coal-bed gas preservation amount is bigger, coal seam coal and gas prominent tendency
Property is bigger, except roof and floor limestone coal seam；This step is mainly carried out qualitative by the theoretical sequence dividing method of coalbed gas geology
Analysis determines each Coal Outburst probability of happening, and assessment result is C；
If it is determined that New Built Mine region layer coal is projected, but has multiple coal seams, the prominent feelings in other coal seams
Position of the condition according to this layer of coal in coal measure strata SEQUENCE STRATIGRAPHIC is analyzed research, invades system tract most sea the closer to extra large (lake)
(lake) general face position, coal-bed gas preservation amount bigger (except roof and floor limestone coal seam), coal seam coal and gas prominent tendentiousness
It is bigger.
The step of assessment result is D includes：Collect each coal seam coal collected or determine when New Built Mine geotechnical boring creeps into
Body Failure type, coal body solid coefficient, spray orifice, bit freezing situation；Stress of coal seam distribution situation is determined by fiber device；Foundation
Gas bearing capacity device determines coal seam gas-bearing capacity situation；The each coal seam gas-bearing capacity of New Built Mine, stress value line distribution map is set up, and
Each region spray orifice, bit freezing situation is marked out, New Built Mine outburst hazard parameter evaluation is carried out；This step is mainly by newly-built ore deposit
The field data of well carries out outburst hazard assessment, and assessment result is D；
The assessment that each step is made according to more than, carries out comprehensive analysis, is complementary to one another, verifies, if assessment result D is true
It is set to protrusion, then New Built Mine is protrusion；If assessment result D is not for projecting, and A or B then needs further to survey ginseng for projecting
Number；If it is determined that a certain coal seam of New Built Mine is projecting coal bed, then need to carry out other coal seam assessments by C and D values.
Preferably, the data that the step of assessment result is A is related to includes：
(1) adjacent periphery mine actually occurs coal and gas prominent feature, such as gas emission, coal outburst quantity, protrusion
Empty feature situation；
(2) adjacent periphery mine coal seam outburst hazard parameter, such as gas pressure P, gas bearing capacity W, coal body robustness
Coefficient f, gas diffusion initial speed, coal body structure type coal；
(3) adjacent periphery mine implements spray orifice, bit freezing situation in boring procedure.
In the event of actual protrusion, then the probability that New Built Mine occurs protrusion is greatly increased；As gas pressure or content,
Coal body solid coefficient, gas diffusion initial speed, coal body Failure type etc. meet outburst hazard critical value, then New Built Mine is sent out
Raw prominent probability is greatly increased；As there is spray orifice, bit freezing in adjacent periphery mine drilling process, then New Built Mine is projected
Probability is greatly increased.
Preferably, the step of assessment result is B also includes：Depositional and burial history, tectonic evolution pattern, thermal evolution history, hydrocarbon history
Space-time configuration determines that coal seam thermal metamorphism generates a large amount of gas and can retain greatly so that gas may be at compared with
High level, such as gas pressure are likely larger than 0.74MPa or gas bearing capacity is more than 8m3/ t, coal and rock are in higher tectonic stress
State, stress may be more than 3 times of rock mass compression strength, and coal measure strata is destroyed, and Coal Pore Structure may be III, IV, V
, if meeting the above, there is prominent probability and greatly increase in class.
Preferably, the step of assessment result is D also includes：
Measurement method and data include as follows：
(1) the coal seam rock core situation of New Built Mine geotechnical boring collection is collected, coal seam Failure type, and collecting part is observed
Coal sample, determines device using solid coefficient and is measured, and drilling situation when analyzing each coal seam of geotechnical boring；
(2) geotechnical boring is based on, is arranged that optical fiber is determined at competent bed position near each coal seam and is answered power apparatus, determine
Stress intensity residing for coal seam；
(3) the coal petrography core gathered based on geotechnical boring, is determined device measure coal and rock single shaft using uniaxial compressive strength and is resisted
Compressive Strength；
(4) the coal petrography core gathered based on geotechnical boring, determining device using direct gas bearing capacity carries out coal seam gas-bearing capacity
Determine；
Based on the coal seam gas-bearing capacity of collection, stress value, data fitting is carried out respectively, gas bearing capacity, stress distribution is set up
Rule formula y=ax+b, y are respectively gas bearing capacity, stress value, and x is buried depth value (being determined by ground elevation, measuring point absolute altitude),
Using each coal seam gas-bearing capacity of Software on Drawing, stress contour figure, and mark surface drilling creep into each coal seam when spray orifice, bit freezing
Situation.If coal seam gas-bearing capacity is more than 8m3/ t, coal body Failure type be III, IV, V class, gas diffusion initial speed △ p >=
10th, coal seam solid coefficient f≤0.5, or coal seam gas-bearing capacity is far longer than 8m3/ t and coal seam solid coefficient f be 0.5～
When 0.8, or coal petrography body stress is for more than 3 times of coal and rock compression strength and coal seam gas-bearing capacity is 6～8m3/ t, then occur
Prominent probability is greatly increased.
As can be seen from the above technical solutions, the present invention has advantages below：
The present invention is mutually tested in terms of neighbouring mine analogy assessment, coalbed gas geology theoretical appraisal and actual measurement parameter evaluation three
Card, comprehensively carries out New Built Mine outburst hazard assessment, improves the reliability of New Built Mine coal and gas prominent risk assessment
Property.
Description of the drawings
In order to be illustrated more clearly that technical scheme, will make simple to accompanying drawing to be used needed for description below
Introduce on ground, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill
For personnel, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is New Built Mine coal and gas prominent risk assessment method and step figure.
Specific embodiment
For enabling goal of the invention of the invention, feature, advantage more obvious and understandable, below will be with specific
Embodiment and accompanying drawing, are clearly and completely described to the technical scheme of present invention protection, it is clear that enforcement disclosed below
Example is only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in this patent, the common skill in this area
All other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model of this patent protection
Enclose.
New Built Mine coal and gas prominent risk assessment method provided in an embodiment of the present invention refers to Fig. 1, such as Fig. 1 institutes
Show, comprise the following steps：
The step of assessment result is A includes：A situation arises to collect neighbouring New Built Mine periphery gas, outburst hazard ginseng
Number situation, implements drilling spray orifice situation, bit freezing situation, and carries out New Built Mine outburst hazard analogy assessment, and then carry out new
Build mine outburst danger analogy assessment；Dangerous parameter includes：Coal Pore Structure, coal body solid coefficient, Methane Diffusion initial velocity
Degree △ p, gas bearing capacity, gas pressure, Desorption Index for Drill Cuttings；This step is mainly entered by New Built Mine adjacent periphery mine situation
The qualitative analogy assessment of row New Built Mine outburst hazard, assessment result is A；
Main data includes：
(1) adjacent periphery mine actually occurs coal and gas prominent feature, such as gas emission, coal outburst quantity, protrusion
Empty feature situation；
(2) adjacent periphery mine coal seam outburst hazard parameter, such as gas pressure P, gas bearing capacity W, coal body robustness
Coefficient f, gas diffusion initial speed, coal body structure type coal etc.；
(3) spray orifice, bit freezing situation etc. in adjacent periphery mine enforcement boring procedure.
In the event of actual protrusion, then the probability that New Built Mine occurs protrusion is greatly increased；As gas pressure or content,
Coal body solid coefficient, gas diffusion initial speed, coal body Failure type etc. meet outburst hazard critical value, then New Built Mine is sent out
Raw prominent probability is greatly increased；There is spray orifice, bit freezing etc. such as in adjacent periphery mine drilling process, then New Built Mine occurs prominent
Go out probability to greatly increase.
Such as waterside town mining area New Built Mine, there occurs prominent dynamic phenomenon due to closing on mine, thus assessment result A is
Outburst danger.
The step of assessment result is B includes：New Built Mine region and mine shaft geology deposition, construction data is collected, analysis is new
Geological environment residing for mine is built, and outburst hazard theoretical appraisal is carried out according to coalbed gas geology theory；Wherein, depositional and burial history, structure
Make Evolutionary History, thermal evolution history, the space-time configuring area of hydrocarbon history and determine the distribution of coal and gas prominent regional space, the space-time is matched somebody with somebody
Putting region includes heavily stressed distributed areas, the region that gas generation condition is good and sealing condition is good, and coal measure strata is crushed and then belonged to
In outburst hazard region；This step carries out qualitative analysis according to coalbed gas geology theory and determines that New Built Mine projects probability of happening,
Assessment result is B；
Concrete analysis structural type, if belong to extruding, sliding structure, whether mine is located at extrusion stress, shear stress area
Domain, and determine several crucial moments of the absorption tolerance in coal seam (when burying most deep moment, maximum temperature moment, earth history
Phase buries most shallow and now), the absorption tolerance in coal seam depends primarily on the coal seam after the experience maximum temperature of coal seam and buries most now
Shallow earth history period, and whether coal measure strata be subjected to big geology destruction in history, carries out theoretical appraisal according to this；
This part is more theoretical according to coalbed gas geology and understanding carries out qualitative analysis and determines that New Built Mine projects probability of happening,
Assessment result is B.
Coalbed gas geology theory thinks that the configuration of the space-time such as depositional and burial history, tectonic evolution pattern, thermal evolution history, hydrocarbon history is determined
Coal seam thermal metamorphism generates a large amount of gas and can retain greatly so that gas may be at higher level, such as
Gas pressure is likely larger than 0.74MPa or gas bearing capacity is more than 8m3/ t, coal and rock are in higher tectonic stress state, and stress can
Can it be more than 3 times of rock mass compression strength, coal measure strata is destroyed, Coal Pore Structure may be III, IV, V class, if met
More than, then there is prominent probability and greatly increase.
Such as Shuicheng, Guizhou Province mining area, Stage of Yanshan tectonic stress field Compression stress position are NW to due to by previous tomography
Affect, define a series of ejective folds, anticline is closed, slow to oblique width, such as two pools are to oblique, big river bank to oblique, angle
Slope aspect is tiltedly, soil a strip of land between hills is to oblique, the river bank to tiltedly etc..Coal of Longtan Coal Series In The Middle can determine according to waterside town mining area buried history and paleogeothermal gradient
Layer late Triassic epoch Mo for bury most deep moment (first time hydrocarbon), middle and later periods Stage of Yanshan be maximum temperature moment (geothermal gradient
It is maximum) and form the crucial geology moment for gas bearing now (buried depth is minimum).Waterside town mining area Lungtan Formation coal seam is in evening three
Folded generation end buried depth reaches 4900m or so, and coal rank reaches the bottle coal stage, generates a large amount of gas, but its adsorbance is not high；Swallow
Mountain middle and later periods coal seam temperature reaches highest, and now coal rank starts constantly rising, but gas adsorption amount is not reaching to maximum；Work as coal seam
Gas adsorption tolerance highest when buried depth reaches 1500m or so, hereafter buried depth minimal instant in coal seam is extremely crucial, because
Coal seam has stopped aerogenesis, and a large amount of gas start loss, which determine coal-bed gas adsorbance now；Waterside town mining area Lungtan Formation is in Jing
After going through maximum temperature, Neogene Period and Quaternary Period local area have carried out regional epeirogenetic earth movement, are constantly in fierce lifting process, now
Coal seam buried depth be the earth history period for burying most shallow buried depth, but marine bed ensure that coal-bed gas have
There is good sealing condition.
The configuration of the space-times such as waterside town mining area depositional and burial history, tectonic evolution pattern, thermal evolution history, hydrocarbon history determines that the region should
Power is higher, gas generation condition is good and sealing condition is good, coal measure strata is relatively crushed etc., it is believed that the region gas pressure is likely larger than
0.74MPa or gas bearing capacity are more than 8m3/ t, coal and rock are in higher tectonic stress state, and stress may be rock mass compression strength
More than 3 times, coal measure strata is destroyed, and Coal Pore Structure may be III, IV, V class, thus theoretical appraisal result B is prominent danger
Danger.
The step of assessment result is C includes：According to New Built Mine coal measure strata data, carry out coal measure strata depositional sequence and draw
Point, Coal Seam Outburst Hazard Severity is carried out according to each coal seam in SEQUENCE STRATIGRAPHIC position；When geological structure, coal body go bad
Under degree same case, sedimentary system, stratigraphic sequence position decide coal seam thickness, roof and floor lithologic, ocurrence of coal seam situation, more
The general face position in system tract most sea (lake) is invaded near sea (lake), coal-bed gas preservation amount is bigger, coal seam coal and gas prominent tendency
Property is bigger, except roof and floor limestone coal seam；This step is mainly carried out qualitative by the theoretical sequence dividing method of coalbed gas geology
Analysis determines each Coal Outburst probability of happening, and assessment result is C；
If it is determined that New Built Mine region layer coal is projected, but has multiple coal seams, the prominent feelings in other coal seams
Condition can be according to this layer of coal in coal measure strata SEQUENCE STRATIGRAPHIC position be analyzed research, invade system tract the closer to extra large (lake) maximum
Extra large (lake) general face position, coal-bed gas preservation amount bigger (except roof and floor limestone coal seam), coal seam coal and gas prominent tendency
Property is bigger.
Such as waterside town mining area ore deposit, coal-bearing strata (Lungtan Formation or Xuanwei group) are divided by sequence stratigraphy and can be divided into two layers
Sequence.Sequence I is from the top of basalt to No. 11 coal seams；Sequence II from the top of No. 11 coal seams → No. 1 coal seam at the top of.Sequence is main
The retrograding sequence that development marine invasion system tract is formed under the larger environment of RELATIVE SEA LEVEL climbing speed.EMEISHAN BASALTS is sprayed
After sending out, after certain sedimentary break, seawater rises rapidly, and holding space increases, with the lifting fluctuation that sea level is fierce
Deposited C101a coal seam → No. 11 coal seam, No. 10 coal seam → No. 1 coal seam is successively thickened as marine invasion constantly expands coal seam and has
Trend, No. 11 coal seams and No. 1 coal seam are respectively sequence I and sequence II maximum marine flooding surface period.
Thus theoretical appraisal result C is：Waterside town mining area 11,13 coal seam entirety gas maximum, coal and gas prominent are the most
Seriously, No. 1 coal seam is taken second place, and 7,8,9,4, No. 2 coal seams are third.
The step of assessment result is D includes：Collect each coal seam coal collected or determine when New Built Mine geotechnical boring creeps into
Body Failure type, coal body solid coefficient, spray orifice, bit freezing situation；Stress of coal seam distribution situation is determined by fiber device；Foundation
Gas bearing capacity device determines coal seam gas-bearing capacity situation；The each coal seam gas-bearing capacity of New Built Mine, stress value line distribution map is set up, and
Each region spray orifice, bit freezing situation is marked out, New Built Mine outburst hazard parameter evaluation is carried out；This step is mainly by newly-built ore deposit
The field data of well carries out outburst hazard assessment, and assessment result is D；
Measurement method and data mainly include as follows：
(1) the coal seam rock core situation of New Built Mine geotechnical boring collection is collected, coal seam Failure type, and collecting part is observed
Coal sample, determines device using solid coefficient and is measured, and analyze drilling situation when geotechnical boring is shown in each coal seam；
(2) geotechnical boring is based on, is arranged that optical fiber is determined at competent bed position near each coal seam and is answered power apparatus, determine
Stress intensity residing for coal seam；
(3) the coal petrography core gathered based on geotechnical boring, is determined device measure coal and rock single shaft using uniaxial compressive strength and is resisted
Compressive Strength；
(4) the coal petrography core gathered based on geotechnical boring, determining device using direct gas bearing capacity carries out coal seam gas-bearing capacity
Determine；
Based on the coal seam gas-bearing capacity of collection, stress value, data fitting is carried out respectively, gas bearing capacity, stress distribution is set up
Rule formula y=ax+b, y are respectively gas bearing capacity, stress value, and x is buried depth value (being determined by ground elevation, measuring point absolute altitude),
Using each coal seam gas-bearing capacity of Software on Drawing, stress contour figure, and mark surface drilling creep into each coal seam when spray orifice, bit freezing
Situation.If coal seam gas-bearing capacity is more than 8m3/ t, coal body Failure type be III, IV, V class, gas diffusion initial speed △ p >=
10th, coal seam solid coefficient f≤0.5, or coal seam gas-bearing capacity is far longer than 8m3/ t and coal seam solid coefficient f be 0.5～
When 0.8, or coal petrography body stress is for more than 3 times of coal and rock compression strength and coal seam gas-bearing capacity is 6～8m3/ t, then occur
Prominent probability is greatly increased.
Such as waterside town mining area ore deposit raw coal gas bearing capacity is 12.6m3/ t, coal body Failure type are at the beginning of IV classes, Methane Diffusion
Speed △ p is 13, coal seam solid coefficient f=0.4, thus actual measurement parameter evaluation result D has for this layer of coal of the New Built Mine
Outburst danger.
The assessment that each step is made according to more than, carries out comprehensive analysis, is complementary to one another, verifies, if assessment result D is true
It is set to protrusion, then New Built Mine is protrusion；If assessment result D is not for projecting, and A or B then needs further to survey ginseng for projecting
Number；If it is determined that a certain coal seam of New Built Mine is projecting coal bed, then need to carry out other coal seam assessments by C and D values.
Mine qualitative evaluation result A, theoretical qualitative evaluation result B, theoretical qualitative evaluation result C, reality is closed on according to more than
Survey parameter evaluation result D, it is known that the mutual result of A, B, D is consistent, and waterside town mining area New Built Mine has outburst danger.
The assessment that each step is made according to more than, carries out comprehensive analysis, is complementary to one another, verifies, such as neighbouring mine evaluation,
Theoretical appraisal and actual measurement parameter evaluation are inconsistent, need further data collection or actual measurement parameter, until it is consistent with each other, improve newly-built
Mine coal assesses reasonability with gas outburst risk.
In this specification, each embodiment is described by the way of progressive, and what each embodiment was stressed is and other
The difference of embodiment, identical similar portion reference mutually between each embodiment.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (4)
1. a kind of New Built Mine coal and gas prominent risk assessment method, it is characterised in that：Comprise the following steps：
The step of assessment result is A includes：A situation arises to collect neighbouring New Built Mine periphery gas, outburst hazard parameter feelings
Condition, implements drilling spray orifice situation, bit freezing situation, and carries out New Built Mine outburst hazard analogy assessment, and then carry out newly-built ore deposit
The analogy of well outburst hazard is assessed；Dangerous parameter includes：Coal Pore Structure, coal body solid coefficient, gas diffusion initial speed △
P, gas bearing capacity, gas pressure, Desorption Index for Drill Cuttings；This step is mainly carried out newly by New Built Mine adjacent periphery mine situation
The dangerous qualitative analogy assessment of mine outburst is built, assessment result is A；
The step of assessment result is B includes：New Built Mine region and mine shaft geology deposition, construction data is collected, newly-built ore deposit is analyzed
Geological environment residing for well, carries out outburst hazard theoretical appraisal according to coalbed gas geology theory；Wherein, depositional and burial history, construction are drilled
Change history, thermal evolution history, the space-time configuring area of hydrocarbon history and determine the distribution of coal and gas prominent regional space, the space-time configuring area
Domain includes heavily stressed distributed areas, the region that gas generation condition is good and sealing condition is good, and coal measure strata is crushed and then belongs to prominent
Go out fatalness region；This step carries out qualitative analysis according to coalbed gas geology theory and determines that New Built Mine projects probability of happening, assessment
As a result it is B；
The step of assessment result is C includes：According to New Built Mine coal measure strata data, coal measure strata depositional sequence division is carried out,
Coal Seam Outburst Hazard Severity is carried out according to each coal seam in SEQUENCE STRATIGRAPHIC position；When geological structure, the rotten journey of coal body
Under degree same case, sedimentary system, stratigraphic sequence position decide coal seam thickness, roof and floor lithologic, ocurrence of coal seam situation, more lean on
The general face position in system tract most sea (lake) is invaded in coastal waters (lake), and coal-bed gas preservation amount is bigger, coal seam coal and gas prominent tendentiousness
It is bigger, except roof and floor limestone coal seam；This step mainly carries out qualitative point by the theoretical sequence dividing method of coalbed gas geology
Analysis determines each Coal Outburst probability of happening, and assessment result is C；
If it is determined that New Built Mine region layer coal is projected, but has multiple coal seams, the prominent situation root in other coal seams
Research is analyzed according to position of this layer of coal in coal measure strata SEQUENCE STRATIGRAPHIC, system tract most sea (lake) is invaded the closer to extra large (lake)
General face position, coal-bed gas preservation amount bigger (except roof and floor limestone coal seam), coal seam coal and gas prominent tendentiousness are bigger；
The step of assessment result is D includes：Collect each coal seam coal body collected when New Built Mine geotechnical boring creeps into or determine to break
Bad type, coal body solid coefficient, spray orifice, bit freezing situation；Stress of coal seam distribution situation is determined by fiber device；According to gas
Content device determines coal seam gas-bearing capacity situation；The each coal seam gas-bearing capacity of New Built Mine, stress value line distribution map is set up, and is marked
Go out each region spray orifice, bit freezing situation, carry out New Built Mine outburst hazard parameter evaluation；This step is mainly by New Built Mine
Field data carries out outburst hazard assessment, and assessment result is D；
The assessment that each step is made according to more than, carries out comprehensive analysis, is complementary to one another, verifies, if assessment result D is defined as
Prominent, then New Built Mine is protrusion；If assessment result D is not for projecting, and A or B then needs further to survey parameter for projecting；
If it is determined that a certain coal seam of New Built Mine is projecting coal bed, then need to carry out other coal seam assessments by C and D values.
2. New Built Mine coal and gas prominent risk assessment method according to claim 1, it is characterised in that：
The data that the step of assessment result is A is related to includes：
(1) adjacent periphery mine actually occurs coal and gas prominent feature, such as gas emission, coal outburst quantity, prominent cavity
Feature situation；
(2) adjacent periphery mine coal seam outburst hazard parameter, such as gas pressure P, gas bearing capacity W, coal body solid coefficient
F, gas diffusion initial speed, coal body structure type coal；
(3) adjacent periphery mine implements spray orifice, bit freezing situation in boring procedure；
In the event of actual protrusion, then the probability that New Built Mine occurs protrusion is greatly increased；Such as gas pressure or content, coal body
Solid coefficient, gas diffusion initial speed, coal body Failure type etc. meet outburst hazard critical value, then New Built Mine occurs prominent
The probability for going out is greatly increased；As there is spray orifice, bit freezing in adjacent periphery mine drilling process, then there is prominent probability in New Built Mine
Greatly increase.
3. New Built Mine coal and gas prominent risk assessment method according to claim 1, it is characterised in that：
The step of assessment result is B also includes：Depositional and burial history, tectonic evolution pattern, thermal evolution history, the configuration of hydrocarbon history space-time are determined
Coal seam thermal metamorphism generates a large amount of gas and can retain greatly so that gas may be at higher level, such as
Gas pressure is likely larger than 0.74MPa or gas bearing capacity is more than 8m3/ t, coal and rock are in higher tectonic stress state, and stress can
Can it be more than 3 times of rock mass compression strength, coal measure strata is destroyed, Coal Pore Structure may be III, IV, V class, if met
More than, then there is prominent probability and greatly increase.
4. New Built Mine coal and gas prominent risk assessment method according to claim 1, it is characterised in that：
The step of assessment result is D also includes：
Measurement method and data include as follows：
(1) the coal seam rock core situation of New Built Mine geotechnical boring collection is collected, coal seam Failure type, and collecting part coal is observed
Sample, determines device using solid coefficient and is measured, and drilling situation when analyzing each coal seam of geotechnical boring；
(2) geotechnical boring is based on, is arranged that optical fiber is determined at competent bed position near each coal seam and is answered power apparatus, determine coal seam
Residing stress intensity；
(3) the coal petrography core gathered based on geotechnical boring, determines device measure coal and rock uniaxial compressive using uniaxial compressive strength strong
Degree；
(4) the coal petrography core gathered based on geotechnical boring, determining device using direct gas bearing capacity carries out coal seam gas-bearing capacity measure；
Based on the coal seam gas-bearing capacity of collection, stress value, data fitting is carried out respectively, gas bearing capacity, stress distribution law is set up
Formula y=ax+b, y are respectively gas bearing capacity, stress value, and x is buried depth value (being determined by ground elevation, measuring point absolute altitude), is utilized
The each coal seam gas-bearing capacity of Software on Drawing, stress contour figure, and mark surface drilling creep into each coal seam when spray orifice, bit freezing feelings
Condition；If coal seam gas-bearing capacity is more than 8m3/ t, coal body Failure type be III, IV, V class, gas diffusion initial speed △ p >=10,
Coal seam solid coefficient f≤0.5, or coal seam gas-bearing capacity is far longer than 8m3/ t and solid coefficient f in coal seam is 0.5～0.8
When, or coal petrography body stress is for more than 3 times of coal and rock compression strength and coal seam gas-bearing capacity is 6～8m3/ t, then project
Probability is greatly increased.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107578152A (en) * | 2017-08-25 | 2018-01-12 | 辽宁工程技术大学 | A kind of evaluation method of multi-branched horizontal well gas pumping scheme |
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| CN112800576A (en) * | 2020-12-14 | 2021-05-14 | 重庆大学 | Coal seam group mining double-pressure-relief outburst-elimination evaluation method |
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