CN113623005A - Method for identifying mixed gas mined from coal seam groups - Google Patents
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- 239000003245 coal Substances 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 73
- 230000008774 maternal effect Effects 0.000 claims abstract description 37
- 238000005070 sampling Methods 0.000 claims abstract description 29
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- 239000007789 gas Substances 0.000 claims description 214
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 55
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- 239000001257 hydrogen Substances 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 36
- 229910052799 carbon Inorganic materials 0.000 claims description 36
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 34
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 25
- 238000005065 mining Methods 0.000 claims description 9
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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 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
Abstract
The invention discloses a method for identifying mixed gas mined by coal seam groups, which comprises the following steps: respectively sampling the coal bed of the working face and the coal beds adjacent to the coal bed to obtain mother gas samples; sampling from the working face to obtain a mixed gas sample; testing the female parent gas sample and the mixed gas sample to respectively obtain a female parent test result and a mixed gas test result; selecting a marking element according to the maternal gas test result; and determining the mixing proportion of each coal bed gas in the mixed gas sample according to the isotope value of the marker element in the maternal gas test result corresponding to each coal bed and the isotope value of the marker element in the mixed gas test result corresponding to each coal bed. The method comprises the steps of collecting samples of all coal beds and mixed gas, selecting the marker elements, and determining the mixing proportion of all the coal beds based on the corresponding isotope values, thereby realizing the quantitative traceability analysis of the mixed gas.
Description
Technical Field
The invention relates to the field of coal mine goaf gas source identification, in particular to a coal seam group mining mixed gas identification method.
Background
The gas gushed from coal mines in China mainly comes from coal beds, the coal and gas are most dangerous to burst out, and the generation mechanism is most complex. The gas emission in the goaf is influenced by various factors, such as working face ventilation, air leakage, buoyancy lift force, goaf porous medium permeability and the like, and is relatively complex compared with a coal wall and coal breakage. At present, people relatively few research aiming at gas sources in a goaf cause that the gas control of a mine is lack of pertinence and effectiveness, particularly, the gas content of a short-distance outburst coal seam group is high, once the gas is released (or outburst) in the process of mining, the source coal seam and the proportion of the gas are difficult to quantitatively identify, and corresponding control strategies are difficult to carry out.
Disclosure of Invention
The invention provides a method for identifying mixed gas mined from coal seam groups, which aims at solving the problems in the prior art, has accurate identification and simple and easy operation, and has important significance for researching gas sources of goafs, effectively managing gas and preventing gas accidents.
The invention discloses a method for identifying mixed gas mined by coal seam groups, which comprises the following steps:
s1: respectively sampling the coal bed of the working face and the coal beds adjacent to the coal bed to obtain mother gas samples; sampling from the working face to obtain a mixed gas sample;
s2: testing the mother gas sample and the mixed gas sample to respectively obtain a mother gas test result and a mixed gas test result, 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 marking element according to the maternal gas test result; wherein, for different coal beds, the isotope values of the marking elements have obvious difference;
s4: and determining the mixing proportion of each coal bed gas in the mixed gas sample according to the isotope value of the marker element in the maternal gas test result corresponding to each coal bed and the isotope value of the marker element in the mixed gas test result corresponding to each coal bed.
Further, the sampling of the parent gas samples from the selected face coal seam and its adjacent coal seams may be preceded by:
and acquiring coal bed information, and determining the local coal bed and the adjacent coal bed of the working face based on the coal bed information.
Further, the sampling of the coal seam and adjacent coal seams of the selected working face to obtain a plurality of maternal gas samples comprises:
and respectively sampling the upper section, the middle section and the lower section of the coal seam at different positions of each coal seam to obtain the maternal gas sample.
Further, the sampling from the working surface obtains a plurality of mixed gas samples, including:
determining a plurality of sampling points on the extraction pipeline according to the advancing sequence of the working face; at least one set of mixed gas samples was taken at each sampling point.
Further, the testing the maternal gas sample and the mixed gas sample to obtain a maternal test result and a mixed gas test result, respectively, includes: and performing a carbon isotope test and a hydrogen isotope test on the mother gas sample and the mixed gas sample.
The maternal test result further includes: and respectively corresponding carbon isotope value and hydrogen isotope value of methane and ethane in the maternal gas of each coal bed.
The mixed gas test result further comprises: the carbon isotope value and the hydrogen isotope value respectively correspond to methane and ethane in the mixed gas.
Further, the mother test result further includes:
the median or average value of the carbon isotope value and the hydrogen isotope value respectively corresponding to methane and ethane in the maternal gas of each coal bed;
and the mother parent gas box type graph is used for reflecting the distribution characteristics of carbon isotope values and 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 respectively comparing corresponding isotope values of carbon and hydrogen elements of methane and ethane in each coal bed, and selecting one or both of the carbon and hydrogen elements with a difference value larger than a difference threshold value as a marking element.
Further, according to the maternal gas test results, a signature element is selected, comprising:
based on the mother gas box diagram, the distribution areas of corresponding isotope values of carbon and hydrogen elements of methane and ethane in each coal bed are compared, and one or both of the carbon and hydrogen elements, which have the distribution area overlapping part not reaching the overlapping threshold value, are selected as the marking elements.
Further, determining the mixing ratio of each coal bed gas in the mixed gas sample according to the isotope value of the marker element in the maternal gas test result corresponding to each coal bed and the isotope value of the marker element in the mixed gas test result corresponding to each coal bed gas includes:
and determining a multi-end element mixed model, acquiring the isotope value of the input marked element in the test result of the maternal gas corresponding to each coal bed and the isotope value of the input marked element in the test result of the mixed gas, analyzing and outputting the mixing proportion of each coal bed gas in the mixed gas sample.
The expression of the multi-terminal mixed model is as follows:
δ1＝xA1+yB1+zC1
δ2＝xA2+yB2+zC2
l＝x+y+z
wherein A is1、B1、C1Respectively, the isotopic values of the marker elements, A, corresponding to the methane of the coal bed2、B2、C2Respectively refer to the isotope value of the marker element of ethane corresponding to the coal bed, and x, y and z respectively refer to the ratio of gas corresponding to the coal bed in the mixed gas sample.
Further, the method for identifying the mixed gas mined by the coal seam group further comprises the following steps: and analyzing the positions of the sampling points and the mixing proportion of the collected mixed gas samples to determine the characteristics of the gas emission rule and the gas source mode.
The invention has at least the following beneficial effects:
the invention selects the marking elements by collecting samples of each coal bed and the mixed gas and determines the mixing proportion of each coal bed based on the corresponding isotope value. And the mixed gas can be quantitatively traced according to the comprehensive analysis of the mixing proportion of samples from different positions. The method is accurate in identification and simple and easy to operate, 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.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic overall flow chart of a method for identifying mixed gas produced by a coal seam group according to a preferred embodiment of the invention.
Fig. 2 is a carbon isotope box diagram of methane in the desorption gas of each coal seam according to the preferred embodiment of the invention.
Fig. 3 is a box diagram of hydrogen isotopes of methane in the desorption gas of each coal seam, as disclosed in the preferred embodiment of the present invention.
Fig. 4 is a carbon isotope box diagram of ethane in the desorption gas of each coal seam, which is disclosed by the preferred embodiment of the invention.
Fig. 5 is a diagram illustrating a calculation of the ratio of the ternary mixed gas according to the 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 is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, the invention discloses a method for identifying mixed gas mined from a coal seam group, which comprises the following steps:
s1: respectively sampling the coal bed of the working face and the coal beds adjacent to the coal bed to obtain mother gas samples; and sampling from the working surface to obtain a mixed gas sample.
S2: and testing the female parent gas sample and the mixed gas sample to respectively obtain a female parent test result and a mixed gas test result. Wherein, the mother gas test result and the mixed gas test result are respectively used for reflecting the isotope values of different elements in the corresponding samples.
S3: and selecting the marking elements according to the test result of the maternal gas. Wherein, the isotope value of the marking element has obvious difference in different coal beds.
S4: and determining the mixing proportion of each coal bed gas in the mixed gas sample according to the isotope value of the marker element in the maternal gas test result corresponding to each coal bed and the isotope value of the marker element in the mixed gas test result corresponding to each coal bed.
In some embodiments of the present invention, taking coal seam gas identification of a certain coal mine as an example, before collecting a sample, coal seam data information is obtained, including but not limited to: the method comprises the following steps of determining the position of a well field, the condition of an adjacent mine, geological structure information, mine mining modes, mining area arrangement, occurrence characteristics of coal-bearing strata, occurrence and emission rules of gas, basic parameters of gas and the like, wherein the coal mine is located in the northwest part of a Taiyuan Xishan coal field, an eastern wing of Malan is inclined, strata incline to the south, the west and incline to 2-15 degrees, the coal-bearing strata in the well field are in a wavy monoclinic structure with the trend of NNE-NNW and the inclination of SSWE, the coal-bearing strata in the well field are mainly a tophan coal system Taiyuan group (C3t) and a lower two-fold system Shanxi group (P1s), wherein the two-fold lower system Shanxi group is called upper group coal, the No. 02, No. 03, No. 2 and No. 4 are coal mining layers, the working face 12505 researched in the embodiment is located in a Penta disk area, the main mining 2# coal layer, the upper distance 02# coal layer is averagely 13.9m, the lower distance 4# is averagely 7.8m, and no coal layer is found. The adopted gas control mode is that the 2# coal seam is pre-pumped in the coal seam, the upper adjacent layer is pumped by arranging a high pumping roadway on the top plate and arranging a top plate trend drilling hole in the track roadway, and the lower adjacent layer is pre-pumped by arranging a 4# coal seam gas in the 12505 bottom pumping roadway. And during the stoping period of the working face, gas in the goaf is extracted by arranging a buried pipe in the track roadway. The working face adopts a U-shaped ventilation system, 12505 belts enter air along the grooves, and 12505 tracks return air along the grooves.
In some embodiments of the present invention, for the sampling of the maternal gas sample, in this embodiment, the maternal gas samples are obtained by sampling the upper section, the middle section and the lower section of the coal seam at different positions of each coal seam, and 9 samples are obtained for each coal seam, and after being crushed, the samples are put into an aluminum foil sampling bag and vacuumized once, so as to remove air mixed in the bag. For the sampling of the mixed gas sample, in this embodiment, the mixed gas sample in the goaf is obtained along with the 12505 working plane advancing respectively at the extraction pipelines at the distances of 8m (at this time, the top plate of the goaf does not collapse), 50m, 87m, 152m and 260m from the cutting hole, preferably, two groups are taken at each place, and the gas is contained by using a polyethylene film sampling bag.
The testing of the female parent gas sample and the mixed gas sample to obtain a female parent test result and a mixed gas test result respectively comprises the following steps: and performing a carbon isotope test and a hydrogen isotope test on the mother gas sample and the mixed gas sample. Preferably, the test content comprises a methane carbon isotope test and a gas component analysis in the gas, the stable carbon isotope value is measured by a Deltaplus XP stable isotope mass spectrometer, and the stable hydrogen isotope test is measured on line by a gas chromatography-isotope spectrometer (GC/TC/Deltaplus XL).
The female parent test result also comprises: and respectively corresponding carbon isotope value and hydrogen isotope value of methane and ethane in the maternal gas of each coal bed. The mixed gas test result further comprises: the carbon isotope value and the hydrogen isotope value respectively correspond to methane and ethane in the mixed gas.
The female parent test result also comprises: the median or average of the measured values of carbon and hydrogen isotopes of the desorbed gas (parent gas) from each coal seam is obtained from the measurement results, and is shown in table 1, for example.
TABLE 1 median value of measurement of hydrocarbon isotope of desorbed gas (parent gas)
The mixed gas test result further comprises: the measured values of the carbon and hydrogen isotopes of the mixed gas, which are shown in table 2 (8 m from the cut) for example, were obtained from the measurement results. In this example, the upper coal group delta was measured13C(CH4) Within-39.97 per mill to 33.80 per mill of delta13C(C2H6) The value is-13.15 to-16.70 per thousand.
TABLE 2 measurement of carbon isotopes in mixed gases
The maternal gas test results further include: fig. 2, fig. 3 and fig. 4 are box diagrams of desorbed gas carbon and hydrogen isotopes in each coal seam, which can effectively reflect the distribution characteristics of carbon isotope values and hydrogen isotope values of methane and ethane in each coal seam.
In some embodiments of the present invention, for the selection of the marker elements, isotope values of 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 having a difference value greater than a difference threshold may be selected as the marker element.
For the selection of the marking elements, the distribution areas of corresponding isotope values of carbon and hydrogen elements of methane and ethane in each coal bed can be compared respectively based on the maternal gas box diagram, and one or both of the corresponding distribution areas of the carbon and hydrogen elements, the overlapping part of which does not reach the overlapping threshold value, can be selected as the marking elements. It is worth mentioning that the various thresholds provided by the present invention may be determined in advance.
In this embodiment, the average value difference between the methane isotope value and the ethane isotope value of each coal seam is large, the overlapping area is small, the difference between the methane hydrogen isotope value is small, and the overlapping area is large. Large errors are caused in the subsequent calculation, which indicates that the hydrogen isotope of methane in the coal mine area is not suitable as the element for the subsequent calculation, and the carbon isotope of methane and the carbon isotope of ethane can be used as the marker isotopes.
For the occupation ratio of each coal bed gas in the mixed gas, a multi-end mixed model can be adopted for calculation, the multi-end mixed model obtains the isotope value of the input marked element in the test result of the maternal gas corresponding to each coal bed and the isotope value of the input marked element in the test result of the mixed gas, and the mixed ratio of each coal bed gas in the mixed gas sample is analyzed and output. In this embodiment, a three-end-member hybrid fireman determination model is specifically adopted, three end members are set to be A, B, C respectively corresponding to an overlying coal seam, a local coal seam, and an underlying coal seam, and the expression of the model is as follows:
δ1＝xA1+yB1+zC1
δ2＝xA2+yB2+zC2
1＝x+y+z
wherein A is1、B1、C1Respectively, the isotopic values of the marker elements, A, corresponding to the methane of the coal bed2、B2、C2Respectively refer to the isotope value of the marker element of ethane corresponding to the coal bed, and x, y and z respectively refer to the ratio of gas corresponding to the coal bed in the mixed gas sample.
In specific calculation, the expression is converted to obtain:
x(A1-C1)+y(B1-C1)＝δ1-C1
x(A2-C2)+y(B2-C2)＝δ2-C2
then, the ratio x, y of A, B end members is obtained by a graphical method, and the ratio z of the C end member can be calculated, as shown in fig. 5 in detail. Therefore, the proportion (mixing proportion) of the gas from each coal bed in the mixed gas can be obtained, and the method has important guiding significance for effectively controlling gas and preventing gas accidents.
In some embodiments of the invention, a plurality of female parent samples and mixed samples are collected, which not only can ensure the calculation accuracy, but also can further analyze the gas source and determine the gas emission rule characteristics and the gas source mode based on the mixing ratio of each mixed gas sample, the position of a sampling point on a working face and the like after the mixing ratio is determined.
In this example, as shown in table 3:
TABLE 3
For 12505 working face high-suction lane and roof strike drilling mixed gas source curve analysis, the two kinds of gas extraction are gas of a goaf roof fracture zone, the gas emission rule and the source separation composition are basically similar, the characteristic of the gas emission dynamic change rule is very obvious, the dynamic change condition of the emission ratio of each gas source layer in the goaf fracture zone can be comprehensively embodied, and the main change rule and the characteristic can be summarized into three stages:
(1) and 02# coal seam flooding stage. Because the high-suction roadway is close to the 02# coal bed, the high-suction roadway gas emission source is mainly the 02# coal and accounts for 80% -90% at the initial mining stage, the 2# coal bed gas accounts for 10-20%, and at the moment, the 4# coal bed gas is not emitted. And when the gas is extracted for the first time, the mining distance is 28m, the initial pressure does not appear on the old roof, but the crack appears on the roof to provide a flow channel so that the residual coal gas in the No. 2 coal goaf is conducted to a high-extraction roadway.
(2) And 2# coal seam flooding stage. When the working face is pushed to 50m, the mixed gas is mainly the 02# coal release point gas and is 72%. Along with the gradual increase of the cracks of the top plate, the volume ratio of the No. 2 coal is increased to 23 percent, and the rising trend is obvious; coal gas # 4 began to appear due to the development of stope fractures and the gradual formation of pressure relief fracture channels in the next adjacent layer, but the proportion was small, only 5%.
(3) And (5) a surge stabilization stage. When sampling for the third time (the working face is 87m away from the cutting hole) to the fifth time (the working face is 260m away from the cutting hole), the old top initial pressure has already finished entering the periodic pressure, and the proportion of the 02# gas in the fissure zone is reduced to be the lowest but still dominant, which is 60%; 2# coal gas is poured into the cracks to reach the highest peak and tend to balance, and the peak reaches 30%; the proportion of No. 4 coal is also improved and reaches a stable stage, accounting for about 10 percent and less.
As shown in table 4:
TABLE 4
The mixed gas at the upper corner takes 2# coal as the main material, accounts for more than 70 percent, and fluctuates between 70 percent and 80 percent along with the advancing of the working face. The No. 02 coal gas is also in a fluctuation state along with the advancing of a working face, but is in a descending trend overall, and accounts for 15 percent when the coal gas is mined for 260 m. The gas ratio of the coal at the upper corner 4# rises from 0 to 5% with the advance of the working face, and fluctuates from 10% to 5%. The proportion of the gas flowing into the stoping surface of the adjacent layer is reduced under the dilution effect of the wind flow.
The proportion of the gas in each coal seam in the buried pipeline before and after the old roof collapses keeps stable all the time. 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%, wherein the 2# coal accounts for 60%. The proportion of the 4# coal seam gas entering the goaf is very small.
In summary, the source mode of the 12505 working face goaf gas is 'the original coal seam + the overlying coal seam'.
The following conclusions are drawn:
the stable carbon-hydrogen isotope distribution characteristics of the desorbed gas of the coal layers of the coal group on the mine are measured by experiments, and the results show that the stable carbon-hydrogen isotopes of all coal layers have certain difference, which is characterized in that the carbon-hydrogen isotopes of the gas have heavier weight along with the increase of the depth, the carbon isotope difference of the methane and the ethane is larger, the hydrogen isotope difference is smaller, and the stable carbon-hydrogen isotopes are not suitable to be used as the marking elements in the calculation.
12505 the dynamic change rule of gas emission of each coal seam in the gas goaf fissure zone of the working surface is respectively a 02# coal seam emission stage, a 2# coal seam emission stage and a stable emission stage, and the proportion of the mixed gas from 02#, 2# and 4# is 60%, 30% and 10% in the stable emission stage. The upper corner of the goaf utilizes a stable isotope technology to distinguish a mixed gas source, so that a more effective basis is provided for the accurate gas treatment.
The above description is only for the specific 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 conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A coal seam group mining mixed gas identification method is characterized by comprising the following steps:
respectively sampling the coal bed of the working face and the coal beds adjacent to the coal bed to obtain mother gas samples; sampling from the working face to obtain a mixed gas sample;
testing the mother gas sample and the mixed gas sample to respectively obtain a mother gas test result and a mixed gas test result, 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 marking element according to the maternal gas test result; wherein, for different coal beds, the isotope values of the marking elements have obvious difference;
and determining the mixing proportion of each coal bed gas in the mixed gas sample according to the isotope value of the marker element in the maternal gas test result corresponding to each coal bed and the isotope value of the marker element in the mixed gas test result corresponding to each coal bed.
2. The method for identifying mixed gas mined from coal seam groups according to claim 1, wherein the sampling of the parent gas samples from the coal seam of the selected face and coal seams adjacent to the coal seam further comprises:
and acquiring coal bed information, and determining the local coal bed and the adjacent coal bed of the working face based on the coal bed information.
3. The method for identifying mixed gas mined from coal seam groups according to claim 1, wherein the obtaining of a plurality of maternal gas samples from the sampling of the coal seam of the selected face and adjacent coal seams comprises:
and respectively sampling the upper section, the middle section and the lower section of the coal seam at different positions of each coal seam to obtain the maternal gas sample.
4. The method for identifying mixed gas mined from coal seam groups according to claim 1, wherein the sampling from the working face to obtain a plurality of mixed gas samples comprises:
determining a plurality of sampling points on the extraction pipeline according to the advancing sequence of the working face; at least one set of mixed gas samples was taken at each sampling point.
5. The method for identifying mixed gas mined from a coal seam group according to claim 1, wherein the step of testing the maternal gas sample and the mixed gas sample to obtain a maternal test result and a mixed gas test result respectively comprises the steps of:
carrying out carbon isotope test and hydrogen isotope test on the mother gas sample and the mixed gas sample;
the maternal test result further includes: respectively corresponding carbon isotope value and hydrogen isotope value of methane and ethane in the maternal gas of each coal bed;
the mixed gas test result further comprises: the carbon isotope value and the hydrogen isotope value respectively correspond to methane and ethane in the mixed gas.
6. The method for identifying mixed gas mined from a coal seam group as claimed in claim 5, wherein the maternal test result further includes:
the median or average value of the carbon isotope value and the hydrogen isotope value respectively corresponding to methane and ethane in the maternal gas of each coal bed;
and the mother parent gas box type graph is used for reflecting the distribution characteristics of carbon isotope values and hydrogen isotope values of methane and ethane in each coal bed.
7. The method for identifying mixed gas mined from a coal seam group according to claim 6, wherein the selecting of the marking element according to the maternal gas test result includes:
and respectively comparing corresponding isotope values of carbon and hydrogen elements of methane and ethane in each coal bed, and selecting one or both of the carbon and hydrogen elements with a difference value larger than a difference threshold value as a marking element.
8. The method for identifying mixed gas mined from a coal seam group as claimed in claim 6, wherein the selecting of the marking element based on the maternal gas test result includes:
based on the mother gas box diagram, the distribution areas of corresponding isotope values of carbon and hydrogen elements of methane and ethane in each coal bed are compared, and one or both of the carbon and hydrogen elements, which have the distribution area overlapping part not reaching the overlapping threshold value, are selected as the marking elements.
9. The method for identifying mixed gas mined from a coal seam group according to claim 1, wherein the determining of the mixing ratio of each coal seam gas in the mixed gas sample according to the isotope value of the marker element in the maternal gas test result corresponding to each coal seam and the isotope value of the marker element in the mixed gas test result comprises:
determining a multi-end element mixed model, acquiring isotope values of the input marked elements in the test result of the maternal gas in each coal bed and isotope values of the marked elements in the test result of the mixed gas, analyzing and outputting the mixing proportion of each coal bed gas in the mixed gas sample;
the expression of the multi-terminal mixed model is as follows:
δ1＝xA1+yB1+zC1
δ2＝xA2+yB2+zC2
1＝x+y+z
wherein A is1、B1、C1Respectively, the isotopic values of the marker elements, A, corresponding to the methane of the coal bed2、B2、C2Respectively refer to the isotope value of the marker element of ethane corresponding to the coal bed, and x, y and z respectively refer to the ratio of gas corresponding to the coal bed in the mixed gas sample.
10. The method for identifying mixed gas mined from a coal seam group according to claim 4, wherein the method for identifying mixed gas mined from a coal seam group further comprises:
and analyzing the positions of the sampling points and the mixing proportion of the collected mixed gas samples to determine the characteristics of the gas emission rule and the gas source mode.
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