构造演化对鸡西煤田瓦斯赋存的控制

发布时间：2019-03-13 13:03

【摘要】：为认清鸡西煤田瓦斯赋存规律,根除导致煤矿瓦斯突出灾害频发的根本原因,运用瓦斯赋存地质构造逐级控制理论,在研究鸡西煤田构造演化的基础上,结合鸡西煤田瓦斯地质图编制资料,分析了煤田地质构造、构造煤形成过程和岩浆作用及其对瓦斯赋存的影响,并结合典型矿井探讨了现代应力场对瓦斯突出危险的控制作用。结果表明,鸡西舷地地质构造复杂,主要表现为规模不等的褶皱、断裂。盆地东南缘受控于敦密断裂,盆地中部的基底突出向东倾伏,发育了平-麻逆冲断裂及一个向东倾伏的基底隆起(恒山隆起),使煤田从东至西成斜卧的"人"字形展部,划分煤田为南北两含煤带,岩浆岩作用的程度控制着煤层的煤化程度,也控制着煤层瓦斯赋存;近EW向、NE向、NNE向构造,尤其是NNE向构造受到强烈挤压、压扭作用,致使煤层受到强烈挤压剪切破坏而发育构造煤,有利于瓦斯赋存;现代构造应力场主应力为NEE向,NNW-NW向构造表现为挤压和压扭作用,成为动力灾害多发地带;NE、NNE向构造的拉张有利于瓦斯释放,动力灾害程度相对较低;NNW-NW向和NE、NNE向复合部位应力集中,动力灾害更容易发生。
[Abstract]:In order to understand the rule of gas occurrence in Jixi coalfield and eradicate the root cause of frequent gas outburst in coal mine, based on the theory of hierarchical control of geological structure of gas occurrence, on the basis of studying the structural evolution of Jixi coalfield, this paper makes use of the theory of step-by-step control of gas occurrence geological structure. Based on the data compiled by gas geological map of Jixi coalfield, this paper analyzes the geological structure, tectonic coal formation process, magmatic process and its influence on gas occurrence in Jixi coalfield, and discusses the control effect of modern stress field on gas outburst danger in combination with typical mines. The results show that the geological structure of Jixi Landside is complex and mainly manifested in folds and faults of different scales. The southeastern margin of the basin is controlled by the Dunmi fault, the basement protruding in the middle of the basin is tilted eastward, and the Ping-Ma thrust fault and an eastward leaning basement uplift (Hengshan uplift) are developed, which causes the "human" shaped expansion of the coal field to lie prostrate from the east to the west. The coal field is divided into two coal-bearing zones in the north and south. The degree of magmatic rock action controls the coalification degree of the coal seam and also controls the occurrence of gas in the coal seam. Near EW direction, NE direction, NNE direction structure, especially in NNE direction structure is strongly squeezed and twisted, resulting in strong compression and shear failure of coal seam and the development of structural coal, which is conducive to gas occurrence. The main stress of modern tectonic stress is in the direction of NEE, while in the direction of NNW-NW, the structure is characterized by compression and torsion, and the tension of the structure in the direction of NE,NNE is beneficial to gas release, and the degree of dynamic disaster is relatively low. The stress concentration of the compound parts in NNW-NW direction and NE,NNE direction makes dynamic disasters more likely to occur.
【作者单位】：河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地河南理工大学安全学院煤炭安全生产河南省协同创新中心;
【基金】：国家十二五重大专项(2011ZX0500-005)
【分类号】：TD712.2

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