前岭煤矿岩浆侵蚀区域瓦斯赋存规律研究

前岭煤矿地质构造复杂,岩浆侵蚀严重,已发生多次煤与瓦斯突出。为有效指导该特殊地质条件下的瓦斯治理,基于矿井地质构造和岩浆岩侵蚀情况,采用实验室测试及现场调查试验研究途径,选择具有代表性的测点,研究复杂地质条件下岩浆岩侵蚀区煤层瓦斯赋存规律。研究结果表明:受上覆岩浆岩热解和变质叠加作用,煤层变质程度增大,区域瓦斯突出判定指标增加;岩浆的高温热解作用,引起了煤层的二次生烃,上覆岩浆岩岩床和向斜轴部低透气性围岩共同对瓦斯的集聚起到了良好的圈闭作用,从而造成向斜轴部瓦斯压力和瓦斯涌出量增加,煤层瓦斯突出危险性增大。

Study on Gas Occurrence Law in Magma Erosion Area of Qianling Coal Mine

A number of coal and gas outburst had occurred in Qianling Coal Mine,due to its complicated geological structure and serious magma erosion.In order to provide an effective guide for gas control under the special geological condition,based on the geological structure of the coal mine and the erosion condition of magmatic rocks,it used the approach of laboratory test and site survey test,chose the representative measuring points,studied the coal seam gas occurrence law in magmatic rocks erosion area under complicated geological conditions.The results showed that under the effect of the overlying magmatic rocks pyrolysis and metamorphic superimposed,the metamorphic degree of coal seam got higher,regional gas outburst judging indexes increased.High temperature pyrolysis of magma caused the coal seam secondary hydrocarbon generation,the overlying magmatic rock bed and the low permeability rock in synclinal axis both played a good enclosing effect on the gas accumulation,thus caused the gas pressure and gas emission increasing in synclinal axis,increased the risk of coal seam gas outburst.