Prediction of gas pressure in thin coal seams in the Qinglong Coal Mine in Guizhou Province, China
Tóm tắt
Thin coal seams in mines usually lack gas data. Thus, preventing and controlling gas outbursts of thin coal seams are difficult. In this study, a coal structure index, which is used to express the damage degree of coal, was estimated by logging curve. In accordance with the contour line of the floor of the coal seam, structural curvature was calculated to express the complexity of the coal seam structure quantitatively. Subsequently, relationships among the burial depth, thickness, coal structure index, structural curvature were analyzed on the basis of the gas pressure of coal seam. The gas pressure values of the coal seams of Nos. 22, 24, and 27 in the study area were predicted by multiple linear regression (MLR) and were then verified and analyzed. The deviation rate of the MLR method was 6.5%–19.7%, with an average of 13.0%. The average deviation rate between the predicted value and the measured value was 11.6%, except for the measuring point of No. 2, which had a large deviation. Results show that the prediction accuracy of the aforementioned method is acceptable and has practical value in the prediction of gas pressure in thin coal seams without measured data. The results in the gas pressure prediction provide a basis for evaluating the risk of gas outbursts in thin coal seams.
Tài liệu tham khảo
Bustin RM, Clarkson CR (1998) Geological controls on coalbed methane reservoir capacity and gas content. Int J Coal Geol 38(1–2):3–26. https://doi.org/10.1016/S0166-5162(98)00030-5
Cao ZY, He XQ, Wang EY, Kong B (2018) Protection scope and gas extraction of the low-protective layer in a thin coal seam: lessons from the DaHe coalfield. China Geosci J 22(3):487–499. https://doi.org/10.1007/s12303-017-0061-1
Dai LC (2016) Research status and prospects of coal seam gas content prediction based on mathematical model. Proc 2016 6th Int Conference Appl Sci Eng Technol 158–162. https://doi.org/10.2991/icaset-16.2016.32
Detailed rules for prevention and control of coal and gas outburst (2019) State administration of coal mine safety of the People’s Republic of China
Dyczko A (2007) Thin coal seams, their role in the reserve base of Poland technical, technological and economic aspects of thin-seams coal mining. Inter Mining Forum 2007:81–87. https://doi.org/10.1201/noe0415436700.ch10
Fu XH, Jiang B, Qin Y (2003) Classification of coalbody structure and prediction of coal reservoir permeability with log curves. Well Logging Technol 27(2):140–143
Gao Z, Ma DM, Chen Y, Zheng C, Teng JX (2020) Study for the effect of temperature on methane desorption based on thermodynamics and kinetics. ACS Omega. https://doi.org/10.1021/acsomega.0c05236
Guo DY, Li CJ, Zhang YY (2014) Contrast study on porosity and permeability of tectonically deformed coal and indigenous coal in Pingdingshan mining area, China. Earth Sci J China Univ Geosci 39:1600–1606
Jiang B, Qu ZH, Wang GG, Li M (2010) Effects of structural deformation on formation of coalbed methane reservoirs in Huaibei coalfield. China. Int J Coal Geol 82(3–4):175–183. https://doi.org/10.1016/j.coal.2009.12.011
Kang GX, Kang TH, Guo JQ, Kang JT, Zhang RX, Zhang XY, Zhao GF, Zhang B, Li LG, Zhang LK (2020) Effect of electric potential gradient on methane adsorption and desorption behaviors in lean coal by electrochemical modification: implications for coalbed methane development of Dongqu mining. China. ACS Omega 5(37):24073–24080. https://doi.org/10.1021/acsomega.0c03496
Krowiak A (2011) Features of the resources of the hard coal covering in thin coal-seams in Poland. In: Bondarenko Volodymyr, Kovalevs’ka Iryna (eds) Genadiy Pivnyak. CRC Press, Tech Geoinformational Syst Min, pp 141–148
Li WG (2011) Experimental study on gas extraction methods in Sichuan basin Xujiahe formaton extremely thin coal seam. Procedia Earth Planetary Sci 2:127–132. https://doi.org/10.1016/j.proeps.2011.09.021
Li DQ (2014) Mining thin sub-layer as self-protective coal seam to reduce the danger of coal and gas outburst. Nat Hazards 71:41–52. https://doi.org/10.1007/s11069-013-0898-1
Li D, Peng SP, Du WF, Guo YL (2019) New method for predicting coal seam gas content. Energy Sour Part A-Recover Utilization Environ Effects 41(10):1272–1284. https://doi.org/10.1080/15567036.2018.1545003
Li W, Jiang B, Moore TA, Wang G, Liu JG, Song Y (2017) Characterization of the chemical structure of tectonically deformed coals. Energy Fuels 31(7):6977–6985. https://doi.org/10.1021/acs.energyfuels.7b00901
Li QS, He X, Wu JH, Ma S (2018) Investigation on coal seam distribution and gas occurrence law in Guizhou China. Energy Explor Exploit 36(5):1310–1334. https://doi.org/10.1177/0144598718758068
Li PP, Zhang XD, Li J, Zhao JP, Huang JP, Zhang S, Zhou SX (2020a) Analysis of the key factors affecting the productivity of coalbed methane wells: a case study of a high-rank coal reservoir in the central and southern Qinshui basin China. ACS Omega 5(43):28012–28026. https://doi.org/10.1021/acsomega.0c03540
Li XC, Chen XL, Zhang F, Zhang MT, Zhang Q, Jia SY (2020b) Energy calculation and simulation of methane adsorbed by coal with different metamorphic grades. ACS Omega 5(25):14976–14989. https://doi.org/10.1021/acsomega.0c00462
Li Y, Wang J, Wang ZS, Pan ZJ (2020c) Variation in permeability during CO2–CH4 displacement in coal seams Part 2: modeling and simulation. ACS Omega 5(29):18432–18440. https://doi.org/10.1021/acsomega.0c02293
Litvinsky GG (2007) The scientific doctrine of manless mining of thin coal seams. Tech Technol Econ Aspect Thin-seams Coal Min Int Min Forum 2007:15–24. https://doi.org/10.1201/noe0415436700.ch3
Liu T, Lin BQ, Yang W, Liu T, Zhai C (2017) An integrated technology for gas control and green mining in deep mines based on ultra-thin seam mining. Environ Earth Sci 76:243. https://doi.org/10.1007/s12665-017-6567-z
Liu LL, Cui ZH, Wang JJ, Xia ZH, Duan LJ, Yang Y, Li M, Li T (2020) Pore size distribution characteristics of high rank coal with various grain sizes. ACS Omega 5(31):19785–19795. https://doi.org/10.1021/acsomega.0c02569
Lu GW, Wang JL, Wei CT, Song Y, Yan GY, Zhang JJ, Chen GH (2018a) Pore fractal model applicability and fractal characteristics of seepage and adsorption pores in middle rank tectonic deformed coals from the Huaibei coal field. J Pet Sci Eng 171:808–817. https://doi.org/10.1016/j.petrol.2018.07.074
Lu GW, Wei CT, Wang JL, Yan GY, Zhang JJ, Song Y (2018b) Methane adsorption characteristics and adsorption model applicability of tectonically deformed coals in the Huaibei coalfield. Energy Fuels 32(7):7485–7496. https://doi.org/10.1021/acs.energyfuels.8b01397
Lu GW, Wei CT, Wang JL, Zhang JJ, Quan FK, Tamehe LS (2019) Variation of surface free energy in the process of methane adsorption in the nanopores of tectonically deformed coals: a case study of middle-rank tectonically deformed coals in the Huaibei Coalfield. Energy Fuels 33(8):7155–7165. https://doi.org/10.1021/acs.energyfuels.9b01265
Lu GW, Wei CT, Wang JL, Meng RY, Tamehe LS (2020) Impacting factors, dynamic process, and correction of adsorption reduction in shale reservoir: a case study on shale samples from the western Guizhou. ACS Omega. https://doi.org/10.1021/acsomega.0c01286
Lu GW, Wei CT, Wang JL, Meng RY, Tamehe LS (2021) Influence of pore structure and surface free energy on the contents of adsorbed and free methane in tectonically deformed coal. Fuel 285:119087. https://doi.org/10.1016/j.fuel.2020.119087
Ma YL, Zhang YL (2008) Simulation experiment research on mining coal in deep inclined thin coal seam. Shanxi Coking Coal Sci Technol
Meng JQ, Li SC, Niu JX (2019) Crystallite structure characteristics and its influence on methane adsorption for different rank coals. ACS Omega 4(24):20762–20772. https://doi.org/10.1021/acsomega.9b03165
Moore TA (2012) Coalbed methane: a review. Int J Coal Geol 101:36–81. https://doi.org/10.1016/j.coal.2012.05.011
Piwniak GG, Bondarenko VI, Salli VI, Pavlenko II, Dychkovskiy RO (2007) Limits to economic viability of extraction of thin coal seams in Ukraine. Tech technol Econ Aspect Thin-seams Coal Min Int Min Forum 129–132
Quan FK, Wei CT, Feng SL, Hu YB (2020) Physical experiment and numerical simulation of the depressurization rate for coalbed methane production. ACS Omega 5(35):22661–22673. https://doi.org/10.1021/acsomega.0c03439
Saluga P (2008) Economic conditions satisfying efficient mining of thin coal seams. Gospodarka Surowcami Mineralnymi-Min Res Manage (in Polish) 24(2):175–187
Shen J, Fu XH, Qin Y, Liu Z (2010) Control actions of structural curvature of coal-seam floor on coalbed gas in the No. 8 Coal Mine of Pingdingshan. J China Coal Soc 35(4):586–589
Song Y, Jiang B, Liu JG (2017) Nanopore structural characteristics and their impact on methane adsorption and diffusion in low to medium tectonically deformed coals: case study in the Huaibei coal field. Energy Fuels 31(7):6711–6723. https://doi.org/10.1021/acs.energyfuels.7b00512
Tong CX, Huang HZ, He H, Wang B (2019) Chemical characteristics and development significance of trace elements in produced water with coalbed methane in Tiefa Basin. ACS Omega 4(17):17561–17568. https://doi.org/10.1021/acsomega.9b02562
Vaziri V, Khademi HJ, Sayadi AR (2015) Estimation of coal gas content using geostatistical methods in GIS environment: a case study from Ta bas coal mine. Proc 24th Int Min Congress Turkey IMCET 1007–1015
Wang GM, Jiao SL, Cheng GX (2011) Fully mechanized coal mining technology for thin coal seam under complicated geological conditions. Energy Explor Exploit 29(2):169–177. https://doi.org/10.1260/0144-5987.29.2.169
Wang F, Tu S, Bai Q (2012) Practice and prospects of fully mechanized mining technology for thin coal seams in China. J South Afr Inst Min Metall 112(2):161–170
Wang FT, Zhang C, Liang NN (2017) Gas permeability evolution mechanism and comprehensive gas drainage technology for thin coal seam mining. Energies 10(9):1382. https://doi.org/10.3390/en10091382
Wang G, Qin Y, Xie YW, Shen J, Zhao L, Huang B, Zhao WQ (2018) Coalbed methane system potential evaluation and favourable area prediction of Gujiao blocks, Xishan coalfield, based on multi-level fuzzy mathematical analysis. J Pet Sci Eng 160:136–151. https://doi.org/10.1016/j.petrol.2017.10.042
Wang JL, Zhai JT, Qin Y, Wang LL, Ju YW (2019) Influencing factors analysis and prediction of the loss of gas content after gas drainage in Xutuan Mine of Huaibei. China. J China Coal Soc 44(8):2401–2408
Wei JP, Hao TX, Liu MJ (2009) BP model of gas content prediction based on quantitative assessment of geological structure complexity. J China Coal Soc 34(8):1090–1094
Zhang XG, Ranjith PG, Perera MS, Ranathunga AS, Haque A (2016) Gas transportation and enhanced coalbed methane recovery processes in deep coal seams: a review. Energy Fuels 30(11):8832–8849. https://doi.org/10.1021/acs.energyfuels.6b01720
Zhang JJ, Wei CT, Chu XX, Vandeginste V, Ju W (2020a) Multifractal analysis in characterizing adsorption pore heterogeneity of middle- and high-rank coal reservoirs. ACS Omega 5(31):19385–19401. https://doi.org/10.1021/acsomega.0c01115
Zhang ZG, Qin Y, Yi TS, You ZJ, Yang ZB (2020b) Pore structure characteristics of coal and their geological controlling factors in eastern Yunnan and western Guizhou China. ACS Omega 5(31):19565–19578. https://doi.org/10.1021/acsomega.0c02041
Zhao TB, Zhang ZY, Tan YL, Shi CZ, Wei P, Li Q (2014a) An innovative approach to thin coal seam mining of complex geological conditions by pressure regulation. Int J Rock Mech Min Sci 71:249–257
Zhao ZG, Yan JP, Liu X (2014b) Research on gas occurrence regularity in Fengcheng mining area of Jiangxi Province. Energy Explor Exploit 32(3):591–599. https://doi.org/10.1260/0144-5987.32.3.591