CN113623005B - Mixed gas recognition method for coal seam group exploitation - Google Patents
Mixed gas recognition method for coal seam group exploitation Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 71
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 230000008774 maternal effect Effects 0.000 claims abstract description 22
- 239000003550 marker Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 212
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 35
- 229910052799 carbon Inorganic materials 0.000 claims description 35
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 34
- 229910052739 hydrogen Inorganic materials 0.000 claims description 34
- 239000001257 hydrogen Substances 0.000 claims description 34
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 24
- 238000010586 diagram Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 4
- PDMMFKSKQVNJMI-BLQWBTBKSA-N Testosterone propionate Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H](OC(=O)CC)[C@@]1(C)CC2 PDMMFKSKQVNJMI-BLQWBTBKSA-N 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000003034 coal gas Substances 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 238000003795 desorption Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- GMACPFCYCYJHOC-UHFFFAOYSA-N [C].C Chemical compound [C].C GMACPFCYCYJHOC-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013211 curve analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Mining & Mineral Resources (AREA)
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Abstract
The invention discloses a method for identifying mixed gas extracted from a coal seam group, which comprises the following steps: sampling the coal seam of the working face and the adjacent coal seam respectively to obtain a mother gas sample; sampling from a working surface to obtain a mixed gas sample; testing a mother gas sample and a mixed gas sample to obtain a mother test result and a mixed gas test result respectively; selecting a marker element according to a maternal gas test result; and determining the mixing proportion of each coal seam gas in the mixed gas sample according to the isotope value of the marking element in the mother gas test result corresponding to each coal seam and the isotope value of the marking element in the mixed gas test result. According to the invention, through collecting samples of each coal seam and mixed gas, selecting the marking elements and determining the mixing proportion of each coal seam based on the corresponding isotope values thereof, the quantitative traceability analysis of the mixed gas is realized.
Description
Technical Field
The invention relates to the field of gas source identification in a coal mine goaf, in particular to a method for identifying mixed gas extracted from a coal seam group.
Background
The gas in coal mine in China mainly comes from coal beds, the coal and gas are most dangerous to be protruded, and the generation mechanism is most complex. The gas emission of the goaf is affected by various factors, such as ventilation of a working surface, air leakage quantity, buoyancy lift, porous medium permeability of the goaf and the like, and is relatively complex compared with the coal wall and coal dropping. At present, people have relatively few researches on gas sources in goafs, so that mine gas management lacks pertinence and effectiveness, particularly, close-range outburst coal seam group exploitation is caused, the coal seam gas content is high, once the gas is released (or outburst) in the exploitation process, the source coal seam and the proportion of the gas are difficult to quantitatively identify, and corresponding management countermeasures are difficult to take place.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for identifying mixed gas extracted from coal seam groups, which has the advantages of accurate identification, simple and feasible operation and great significance in researching goaf gas sources, effectively controlling gas and preventing gas accidents.
The invention discloses a method for identifying mixed gas extracted from a coal seam group, which comprises the following steps:
s1: sampling the coal seam of the working face and the adjacent coal seam respectively to obtain a mother gas sample; sampling from a working surface to obtain a mixed gas sample;
s2: testing a mother gas sample and a mixed gas sample to obtain a mother test result and a mixed gas test result respectively, wherein the mother gas test result and the mixed gas test result are respectively used for reflecting isotope values of different elements in the corresponding samples;
s3: selecting a marker element according to a maternal gas test result; wherein, the isotope values of the marking elements have obvious differences in different coal seams;
s4: and determining the mixing proportion of each coal seam gas in the mixed gas sample according to the isotope value of the marking element in the mother gas test result corresponding to each coal seam and the isotope value of the marking element in the mixed gas test result.
Further, the sampling of the present coal seam and the adjacent coal seam of the selected working face to obtain a plurality of maternal gas samples further comprises:
and acquiring the data information of the coal bed, and determining the coal bed and the adjacent coal beds of the working face based on the data information of the coal bed.
Further, the sampling of the plurality of maternal gas samples from the present coal seam and adjacent coal seams thereof at the selected working surface comprises:
sampling the positions of the upper section, the middle section and the lower section of each coal seam at different positions of each coal seam to obtain a mother parent gas sample.
Further, the sampling of the working surface to obtain a plurality of mixed gas samples comprises:
determining a plurality of sampling points on the extraction pipeline according to the working face advancing sequence; at least one set of mixed gas samples is collected at each sampling point.
Further, the testing of the mother gas sample and the mixed gas sample to obtain a mother test result and a mixed gas test result, respectively, includes: and performing carbon isotope test and hydrogen isotope test on the mother gas sample and the mixed gas sample.
The maternal test result further comprises: and the carbon isotope values and the hydrogen isotope values of methane and ethane in the mother gases of the coal beds respectively correspond to each other.
The mixed gas test result further comprises: and the carbon isotope and the hydrogen isotope values of methane and ethane in the mixed gas respectively correspond to each other.
Further, the maternal test result further comprises:
the middle or average value of the carbon isotope value and the hydrogen isotope value corresponding to methane and ethane in the mother gas of each coal bed respectively;
and the mother gas box diagram is used for reflecting the distribution characteristics of the carbon isotope values and the hydrogen isotope values of methane and ethane in each coal bed.
Further, the selecting a marker element according to the maternal gas test result includes:
and comparing the isotope values of the carbon and hydrogen elements of methane and ethane in each coal seam, and selecting one or two of the carbon and hydrogen elements with the corresponding difference value larger than the difference threshold value as the marking element.
Further, according to the maternal gas test result, selecting a marker element comprising:
based on the mother gas box diagram, the distribution areas of the corresponding isotope values of the carbon and hydrogen elements of methane and ethane in each coal seam are compared, and one or both of the overlapping parts of the corresponding distribution areas of the carbon and hydrogen elements which do not reach the overlapping threshold value are selected as the marker elements.
Further, determining the mixing proportion of each coal seam gas in the mixed gas sample according to the isotope value corresponding to the marker element in the maternal gas test result and the isotope value corresponding to the marker element in the mixed gas test result, including:
determining a multi-end member mixing model, acquiring isotope values corresponding to the marker elements in the coal beds in the input maternal gas test results and isotope values corresponding to the marker elements in the mixed gas test results by the multi-end member mixing model, and analyzing and outputting the mixing proportion of the coal bed gases in the mixed gas sample.
The expression of the multi-terminal hybrid model is as follows:
δ 1 ＝xA 1 +yB 1 +zC 1
δ 2 ＝xA 2 +yB 2 +zC 2
l＝x+y+z
wherein A is 1 、B 1 、C 1 Respectively refer to the isotope values of the marking elements of methane corresponding to the coal beds, A 2 、B 2 、C 2 Respectively refer to the isotope values of the marker elements of the ethane corresponding to the coal seam, and x, y and z respectively refer to the ratio of the gas corresponding to the coal seam in the mixed gas sample.
Further, the method for identifying the mixed gas extracted from the coal seam group further comprises the following steps: analyzing the positions of the sampling points and the mixing proportion of the collected mixed gas samples to determine the characteristic of the gas emission rule and the gas source mode.
The invention has at least the following beneficial effects:
the invention collects samples of each coal seam and mixed gas, selects the marking element and determines the mixing proportion of each coal seam based on the corresponding isotope value. And the quantitative traceability analysis of the mixed gas can be realized according to the comprehensive analysis of the mixing proportion of samples from different positions. The invention has accurate identification and simple and easy operation, and has important guiding significance for researching the gas source of the goaf, effectively controlling the gas and preventing gas accidents.
Other advantageous effects of the present invention will be described in detail in the detailed description section.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic overall flow diagram of a method for identifying gas mixtures produced by a coal seam group according to a preferred embodiment of the present invention.
Fig. 2 is a box diagram of carbon isotopes of methane in a resolved gas from each coal seam in accordance with a preferred embodiment of the present invention.
Fig. 3 is a hydrogen isotope box diagram of methane in each coal seam analysis gas in accordance with a preferred embodiment of the present invention.
Figure 4 is a box plot of carbon isotopes of ethane in the resolved gas of each coal seam in accordance with a preferred embodiment of the present invention.
Fig. 5 is a graph of a ternary mixed gas ratio calculation according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
As shown in fig. 1, the invention discloses a method for identifying gas mixture produced by a coal seam group, which comprises the following steps:
s1: sampling the coal seam of the working face and the adjacent coal seam respectively to obtain a mother gas sample; a sample of the mixed gas was obtained by sampling from the working surface.
S2: and testing the mother gas sample and the mixed gas sample to obtain a mother test result and a mixed gas test result respectively. The mother gas test result and the mixed gas test result are respectively used for reflecting isotope values of different elements in the corresponding sample.
S3: and selecting a marker element according to the maternal gas test result. Wherein the isotope values of the marker elements are significantly different for different coal seams.
S4: and determining the mixing proportion of each coal seam gas in the mixed gas sample according to the isotope value of the marking element in the mother gas test result corresponding to each coal seam and the isotope value of the marking element in the mixed gas test result.
In some embodiments of the present invention, for example, coal seam gas identification in a coal mine, coal seam data information is obtained prior to sample collection, including but not limited to: well Tian Weizhi, adjacent mine condition, geological structure information, mine mining mode, mining area arrangement, coal-bearing stratum occurrence feature, gas occurrence emission law, gas basic parameters and the like, for example, the coal mine is located in the northwest part of a Taiyuan mountain coal field, the east wing of a Malan syncline, the stratum is inclined to south and west, the inclination angle is 2-15 degrees, a NNE-NNW trend and SSWE trend-like single-inclined structure is formed, coal-bearing stratum in the well field mainly comprises an upper-stone coal system Taiyuan group (C3 t) and a lower two-fold system Shanxi group (P1 s), wherein the two-fold system lower-system Shanxi group is called an upper-group coal, no. 02, no. 03, no. 2 and No. 4 are harvestable coal beds, the 12505 working face studied in this embodiment is located in the five-disc-in-mode area, the main coal bed is mainly used for the No. 2, the upper-numbered coal bed is 13.9m on average, and the lower-numbered 4 coal bed is 7.8m on average, and the 03 coal is not seen. The adopted gas control mode is that the coal bed pre-pumps the No. 2 coal bed, the upper adjacent layer pumps through arranging a high pumping roadway on a top plate and arranging a top plate trend drilling hole on a track roadway, and the lower adjacent layer pre-pumps the No. 4 coal bed gas through a 12505 bottom pumping roadway. Goaf gas is extracted during working face stoping through arranging buried pipes in a track roadway. The working surface adopts a U-shaped ventilation system, 12505 belt cis-slot air intake and 12505 track cis-slot air return.
In some embodiments of the present invention, for sampling of the maternal gas sample, in this embodiment, samples of the maternal gas sample are taken at the upper, middle and lower sections of each coal seam at different positions respectively, and 9 samples are taken for each coal seam, crushed and placed in an aluminum foil sampling bag and vacuumized once, in order to remove air mixed in the bag. For sampling the mixed gas samples, in this embodiment, the mixed gas samples of the goaf are taken along with the 12505 working surface pushing in the extraction pipelines at a distance of 8m (at this time, the top plate of the goaf does not collapse), 50m, 87m, 152m and 260m respectively, preferably, two groups of mixed gas samples are taken at each place, and the gas is contained by using a polyethylene film sampling bag.
The testing of the mother gas sample and the mixed gas sample respectively obtains a mother test result and a mixed gas test result, and comprises the following steps: and performing carbon isotope test and hydrogen isotope test on the mother gas sample and the mixed gas sample. Preferably, the test content comprises the use of a Deltaplus XP stable isotope mass spectrometer for the methane carbon isotope test and the gas component analysis in the gas, and the use of a gas chromatograph-isotope spectrometer (GC/TC/Deltaplus XL) for the stable hydrogen isotope test.
Female parent test results, further comprising: and the carbon isotope values and the hydrogen isotope values of methane and ethane in the mother gases of the coal beds respectively correspond to each other. The mixed gas test result further comprises: and the carbon isotope and the hydrogen isotope values of methane and ethane in the mixed gas respectively correspond to each other.
Female parent test results, further comprising: the median or average value of the measured values of carbon and hydrogen isotopes in each coal bed desorption gas (parent gas) was obtained from the measurement results, and is shown in table 1, for example.
TABLE 1 median value of measured values of hydrocarbon isotopes of desorption gas (parent gas)
The mixed gas test result further comprises: based on the measurement results, measurement values of carbon and hydrogen isotopes of the mixed gas were obtained, for example, as shown in table 2 (8 m from the cut hole). In this example, the upper group coal delta was measured 13 C(CH 4 ) At-39.97% 13 C(C 2 H 6 ) The value is-13.15 per mill to-16.70 per mill.
Table 2 measurement of carbon isotope in mixed gas
The maternal gas test results further include: as shown in fig. 2, 3 and 4, the desorption gas carbon and hydrogen isotope box diagrams of each coal seam can effectively reflect the carbon isotope values and the distribution characteristics of the hydrogen isotope values of methane and ethane in each coal seam.
In some embodiments of the present invention, for the selection of the flag element, the isotope values corresponding to the carbon and hydrogen elements of methane and ethane in each coal seam may be compared, and one or both of the carbon and hydrogen elements with the difference value greater than the difference threshold may be selected as the flag element.
For the selection of the flag element, the distribution areas of the corresponding isotope values of the carbon and hydrogen elements of methane and ethane in each coal seam may be compared based on the maternal gas box diagram, and one or both of the overlapping portions of the corresponding distribution areas of the carbon and hydrogen elements that do not reach the overlapping threshold may be selected as the flag element. It is worth mentioning that the various thresholds provided by the invention can be determined in advance.
In this embodiment, the average value of the isotope values of methane and ethane in each coal bed is larger, the overlapping area is smaller, the difference of the isotope values of methane and hydrogen is smaller, and the overlapping area is larger. A large error is caused in the subsequent calculations, indicating that the methane hydrogen isotope is not suitable as the element for the subsequent calculation of the duty cycle in the coal mine region, and that the carbon isotope of methane and the carbon isotope of ethane may be used as the marker isotopes.
And calculating the duty ratio of each coal bed gas in the mixed gas by adopting a multi-end mixed model, wherein the multi-end mixed model acquires the isotope value corresponding to each coal bed of the marker element in the input maternal gas test result and the isotope value corresponding to the marker element in the mixed gas test result, and analyzing and outputting the mixing proportion of each coal bed gas in the mixed gas sample. In this embodiment, a three-terminal member mixed gas operator discriminating model is specifically adopted, three terminal members are set to be A, B, C respectively, and the three terminal members correspond to an overlying coal seam, a present coal seam and a lower coal seam respectively, and the expression of the model is as follows:
δ 1 ＝xA 1 +yB 1 +zC 1
δ 2 ＝xA 2 +yB 2 +zC 2
1＝x+y+z
wherein A is 1 、B 1 、C 1 Respectively refer to the isotope values of the marking elements of methane corresponding to the coal beds, A 2 、B 2 、C 2 Respectively refer to the isotope values of the marker elements of the ethane corresponding to the coal seam, and x, y and z respectively refer to the ratio of the gas corresponding to the coal seam in the mixed gas sample.
In the concrete calculation, the expression is converted into:
x(A 1 -C 1 )+y(B 1 -C 1 )＝δ 1 -C 1
x(A 2 -C 2 )+y(B 2 -C 2 )＝δ 2 -C 2
then, the proportions x and y of the A, B end members are found by a graphic method, so that the proportion z of the C end member can be calculated, as shown in FIG. 5. The proportion (mixing proportion) of the gas source from each coal seam in the mixed gas can be obtained, and the method has important guiding significance for effectively controlling the gas and preventing the gas accident.
In some embodiments of the present invention, a plurality of female parent samples and mixed samples are collected, which not only can ensure calculation accuracy, but also can further analyze gas sources based on the mixing proportion of each mixed gas sample, the position of a sampling point on a working surface, etc. after determining the mixing proportion, determine gas emission rule characteristics and gas source modes.
In this example, as shown in table 3:
TABLE 3 Table 3
For the mixed gas source curve analysis of the 12505 working face high drainage roadway and the roof trend drilling, the two types of the extracted gas are the gas of the goaf roof fracture zone, the gas emission rule and the source division composition are basically similar, the characteristic of the gas emission dynamic change rule is quite obvious, the situation of the dynamic change of the emission duty ratio of each gas source layer in the goaf fracture zone can be comprehensively reflected, and the main change rule and the characteristic can be summarized into three stages:
(1) And (3) a phase of surging the 02# coal bed. Because the high drainage roadway is closer to the No. 02 coal bed, the gas emission source of the high drainage roadway is mainly No. 02 coal at the beginning of mining, the gas emission source accounts for 80% -90%, the gas of the No. 2 coal bed accounts for 10% -20%, and the gas of the No. 4 coal bed is not emitted temporarily. The mining distance is 28m when the gas is taken for the first time, the old roof is not pressed for the first time, but the roof is cracked to provide a flow channel for the residual coal gas of the No. 2 coal goaf to be conducted to the high extraction roadway.
(2) And 2# coal seam gushing stage. When the working surface is advanced to 50m, the mixed gas is still mainly the 02# coal release point gas, which is 72%. As the roof cracks are gradually increased, the volume ratio of the No. 2 coal is increased to 23%, and the rising trend is obvious; because of the development of stope cracks and the gradual formation of pressure relief crack channels in the lower adjacent layers, the 4# coal gas begins to appear, but the proportion is smaller, which is only 5%.
(3) And (3) surging out a stabilization stage. When the third sampling (working face distance cut 87 m) to the fifth sampling (working face distance cut 260 m) are performed, the old roof is pressed for the first time and enters a period for pressing, and the 02# gas proportion in the fracture zone is reduced to the lowest but still is dominant, and is 60%; the gas of the No. 2 coal is flushed into the cracks to reach the highest peak and tends to be balanced to reach 30%; the proportion of the No. 4 coal is also improved to reach a stable stage, and the proportion is about 10 percent and the proportion is less.
As shown in table 4:
TABLE 4 Table 4
The mixed gas at the upper corner is mainly 2# coal, the proportion of which is more than 70 percent, and the mixed gas fluctuates between 70 percent and 80 percent along with the propulsion of the working surface. The 02# coal gas also shows a fluctuation state along with the pushing of the working surface, but generally shows a descending trend, and the proportion accounts for 15% when the coal gas is recovered for 260 m. The upper corner 4# coal gas duty ratio rises from 0 to 5% with working face propulsion, and 10% fluctuates to 5%. The proportion of gas flowing into the recovery surface from the adjacent layer is reduced under the dilution effect of wind flow.
The gas occupation ratio of each coal bed in the buried pipe pipeline is always stable before and after the old roof collapses. The coal seam and the upper adjacent layer are mainly used, the proportion of the coal seam and the upper adjacent layer is more than 90%, and the proportion of No. 2 coal is 60%. The proportion of the No. 4 coal bed gas entering the goaf is small.
In the comprehensive view, the gas source mode of the 12505 working face goaf is 'the coal seam and the overlying coal seam'.
Thus, the following conclusion is drawn:
the experiment shows that the stable hydrocarbon isotopes of the desorption gas of the coal layer of the coal on the mine have certain differences, the characteristic that the gas hydrocarbon isotopes are biased with the increase of depth is shown, the difference of the carbon isotopes of methane and ethane is larger, the difference of the hydrogen isotopes is smaller, and the gas hydrocarbon isotopes are unsuitable to be used as the marking elements in calculation.
The gas emission of each coal seam in the 12505 working face gas goaf fracture zone shows a dynamic change rule, and the dynamic change rule is a 02# coal seam emission stage, a 2# coal seam emission stage and a stable emission stage respectively, wherein the proportion of the mixed gas from 02# gas, 2# gas and 4# gas in the stable emission stage is 60%, 30% gas and 10% gas. The upper corner of the goaf utilizes stable isotope technology to judge the mixed gas source, thereby providing more effective basis for the accurate control of the gas.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered.
Claims (5)
1. A method for identifying gas mixture produced by a coal seam group, comprising the steps of:
sampling the coal seam of the working face and the adjacent coal seam respectively to obtain a mother gas sample; sampling from a working surface to obtain a mixed gas sample;
testing a mother gas sample and a mixed gas sample to obtain a mother test result and a mixed gas test result respectively, wherein the mother gas test result and the mixed gas test result are respectively used for reflecting isotope values of different elements in the corresponding samples;
selecting a marker element according to a maternal gas test result; wherein, the isotope values of the marking elements have obvious differences in different coal seams;
determining the mixing proportion of each coal seam gas in the mixed gas sample according to the isotope value of the marking element in the mother gas test result corresponding to each coal seam and the isotope value of the marking element in the mixed gas test result;
the method for testing the mother gas sample and the mixed gas sample respectively obtains a mother test result and a mixed gas test result, and comprises the following steps:
performing carbon isotope test and hydrogen isotope test on the mother gas sample and the mixed gas sample;
the maternal test result further comprises: the carbon isotope values and the hydrogen isotope values of methane and ethane in the mother gases of the coal beds respectively correspond to each other; the middle or average value of the carbon isotope value and the hydrogen isotope value corresponding to methane and ethane in the mother gas of each coal bed respectively; a mother gas box diagram for reflecting the distribution characteristics of carbon isotope values and hydrogen isotope values of methane and ethane in each coal bed;
the mixed gas test result further comprises: the values of carbon isotopes and hydrogen isotopes corresponding to methane and ethane in the mixed gas respectively;
the selective marker element according to the maternal gas test result comprises:
respectively comparing isotope values corresponding to carbon and hydrogen elements of methane and ethane in each coal seam, and selecting one or two of the carbon and hydrogen elements with the corresponding difference value larger than a difference threshold value as a marking element; or, based on a mother gas box diagram, comparing distribution areas of corresponding isotope values of carbon and hydrogen elements of methane and ethane in each coal seam, and selecting one or two of the overlapping parts of the corresponding distribution areas of the carbon and hydrogen elements which do not reach an overlapping threshold as a marking element;
determining the mixing proportion of each coal seam gas in the mixed gas sample according to the isotope value corresponding to the marking element in each coal seam in the mother gas test result and the isotope value corresponding to the marking element in the mixed gas test result, wherein the method comprises the following steps:
determining a multi-end member mixing model, acquiring isotope values corresponding to the marker elements in each coal seam in an input maternal gas test result and isotope values corresponding to the marker elements in a mixed gas test result by the multi-end member mixing model, and analyzing and outputting the mixing proportion of each coal seam gas in a mixed gas sample;
the expression of the multi-terminal hybrid model is as follows:
；
wherein A is 1 、B 1 、C 1 Respectively refer to the isotope values of the marking elements of methane corresponding to the coal beds, A 2 、B 2 、C 2 Respectively refer to the isotope values of the marker elements of the ethane corresponding to the coal seam, and x, y and z respectively refer to the ratio of the gas corresponding to the coal seam in the mixed gas sample.
2. The method of claim 1, further comprising sampling a plurality of maternal gas samples from the coal seam of the selected face and adjacent coal seams:
and acquiring the data information of the coal bed, and determining the coal bed and the adjacent coal beds of the working face based on the data information of the coal bed.
3. The method of claim 1, wherein sampling a plurality of maternal gas samples from the coal seam of the selected face and adjacent coal seams, comprising:
sampling the positions of the upper section, the middle section and the lower section of each coal seam at different positions of each coal seam to obtain a mother parent gas sample.
4. The method for identifying gas mixtures produced by a coal seam group according to claim 1, wherein said sampling gas mixtures from a face comprises:
determining a plurality of sampling points on the extraction pipeline according to the working face advancing sequence; at least one set of mixed gas samples is collected at each sampling point.
5. The method for identifying gas mixture produced by a coal seam group as set forth in claim 4, further comprising:
analyzing the positions of the sampling points and the mixing proportion of the collected mixed gas samples to determine the characteristic of the gas emission rule and the gas source mode.
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