古汉山矿二_1煤层渗透性优势方位及对瓦斯抽采的影响
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摘要
通过对古汉山矿二1煤层裂隙观测统计,分析了煤层裂隙开启、闭合特征,矿井东区N50°E走向裂隙组受地应力相对拉张作用,矿井西区N30°E走向裂隙组受地应力相对拉张作用,预测矿井东区、西区煤层渗透性优势方位分别为N50°E、N30°E。矿井西区煤层渗透率现场测试表明,沿N55°W方向测试钻孔渗透率数值均远大于其它方向,煤层渗透性优势分布方位为N35°E,现场测试结果与煤层渗透性优势方位预测基本一致。鉴于二1煤层渗透性分布特征,探讨了水力压裂、酸化煤层等措施对煤层渗透性的影响,提出了矿井瓦斯最优瓦斯抽采方案,即东区瓦斯抽采钻孔设计应与N50°E向垂直、西区瓦斯抽采钻孔设计应与N35°E向垂直。
Through the observation statistics of Guhanshan Coal Mine coal seam fractures, the coal fracture opening and closing control features is analyzed, eastern gas geological unit N50° E to fracture group affected by in situ stress relative tension, the western gas geological unit N30° E to fracture affected by the relative stress and tension in and prediction of mine gas geology units of the eastern, the western gas geological unit of coal seam permeability advantage range is N50° E, N30° E, respectively.Field test results show that the coal seam permeability presents anisotropic distribution, along the N55° W direction, the measurement of borehole permeability value is far greater than in the other direction, the advantage distribution range of coal seam permeability is N35°E, the results of field tests and coal seam permeability advantage range prediction is consistent. In view of the permeability distribution characteristics of Ⅱ_1 coal seam, the influence of hydraulic fracturing, acidizing coal seam and other measures on the permeability of coal seam is discussed. The optimal gas mine gas extraction solution is proposed, namely, eastern gas drainage by drilling design should be vertical to N50°E, and western gas drainage by drilling design should be vertical to the N35°E.
Through the observation statistics of Guhanshan Coal Mine coal seam fractures, the coal fracture opening and closing control features is analyzed, eastern gas geological unit N50° E to fracture group affected by in situ stress relative tension, the western gas geological unit N30° E to fracture affected by the relative stress and tension in and prediction of mine gas geology units of the eastern, the western gas geological unit of coal seam permeability advantage range is N50° E, N30° E, respectively.Field test results show that the coal seam permeability presents anisotropic distribution, along the N55° W direction, the measurement of borehole permeability value is far greater than in the other direction, the advantage distribution range of coal seam permeability is N35°E, the results of field tests and coal seam permeability advantage range prediction is consistent. In view of the permeability distribution characteristics of Ⅱ_1 coal seam, the influence of hydraulic fracturing, acidizing coal seam and other measures on the permeability of coal seam is discussed. The optimal gas mine gas extraction solution is proposed, namely, eastern gas drainage by drilling design should be vertical to N50°E, and western gas drainage by drilling design should be vertical to the N35°E.
引文
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[3]陈金刚,宋全友,秦勇.煤层割理在煤层气开发中的试验研究[J].煤田地质与勘探,2002,30(2):26-28.
[4]苏生瑞.构造地质学[M].北京:地质出版社,2011.
[5]秦勇,张德民,傅雪海,等.山西沁水盆地中、南部现代构造应力场与煤储层物性关系之探讨[J].地质论评,1999(6):576-583.
[6]倪小明.煤层气开发地质学[M].北京:化学工业出版社,2010.
[7]李志伟.古汉山井田煤层气产出机理及可采性综合评价[D].焦作:河南理工大学,2012.
[8]李宪振.古汉山矿高应力巷道围岩稳定性与支护技术研究[D].焦作:河南理工大学,2009.
[9]张占存.压力恢复曲线测定煤层瓦斯赋存参数的试验研究[J].煤炭学报,2012,37(8):1310-1314.
[10]苏理波.煤矿井下水力强化理论与技术[M].北京:科学出版社,2014.
[11]倪小明,李全中,王延斌,等.多组分酸对不同煤阶煤储层化学增透实验研究[J].煤炭学报,2014(S2):436-440