常村井田构造成因及对瓦斯赋存的影响

Genesis of Geological Structure and Effect on Gas Occurrence in Changcun Minefield

为研究潞安常村井田瓦斯地质规律，运用瓦斯赋存构造逐级控制理论，结合大量瓦斯地质资料研究了井田内断层、褶曲和陷落柱的成因及对瓦斯的影响，结果表明：NEE、近EW和SEE向导通邻近含水层的断层，受现今构造应力场作用，易形成开放性断层，落差约50m时对瓦斯的影响范围为130—140m，而小断层则通常成为瓦斯赋存的有利场所，落差约1rn时对瓦斯的影响范围为30～40m；近SN和NNW向的断层一直处于压扭状态，封闭性较好，因挤压、剪切活动较强，造成附近构造煤发育，控制着煤与瓦斯突出的分布。褶皱主要为向斜褶皱上层聚集型、背斜褶皱上层逸散型。陷落柱封闭性好，但发育在NEE、近EW和SEE向大落差断层附近时，通常封闭性较差，不利于瓦斯赋存。

In order to study gas geological rules of Changcun Minefield, geological structure gradual control theory on gas occurrence was used to analyze formation of geological structure, and its effect on gas occurrence was also analyzed combined with a large number of gas geological datas.The results showed that these large throw conducting adjacent aquifers faults of NEE, near EW and SEE were easy to form open faults to release gas on account of present tectonic stress field control.Gas relesaing effect range of fault with 50 m throw was 130 ~ 140 m.However, these small scale faults of same direction were easy to become favorable location of gas occurrence, and gas reservoir effect range of fault with 1 m throw was 30-40 m.These faults of near SN and NNW were always in state of compress-torque to save gas, com- pression and strong shear force leaded deformed-coal develop well near these faults, so it could be concluded that these faults controlled coal and gas outburst distribution in deep.Syncline structure was likely to save gas, conversely, and anticlinal structure was not. Most of karstic collapse columns were well-sealed against gas occurrence , but which developed near large throw geologic faults of NEE, near EW and SEE often were poor-sealed against gas occurrence.