常村煤矿3#煤层煤与瓦斯突出危险区地球物理预测方法

Coal No.3 Coal and Gas Outburst Hazard Area Geophysical Prediction in Changcun Coalmine

国内煤与瓦斯突出矿井的瓦斯地质调查与研究成果表明:构造煤的存在是瓦斯富集及产生煤与瓦斯突出的一个必要条件。山西潞安常村煤矿就属高瓦斯矿井,其煤层瓦斯的富集具有较大的致灾性,对煤矿安全生产构成严重威胁。根据该矿区的地质、钻孔资料,运用电阻率测井联合地震反演技术及叠前AVO技术,综合测区内构造煤发育与煤层瓦斯富集的地球物理响应特征,对测区煤与瓦斯突出危险区进行预测。结果表明:1煤与瓦斯突出危险区主要分布在老军庄向斜、姬村向斜及背向斜结合部位,与构造煤范围一致;2构造煤主要受控于应力集中带;3电阻率测井对构造煤反应敏感,应用电阻率反演技术预测构造煤分布特征结果较可靠。

The gas geological investigation and studied resuhs for coal and gas outburst coalmines in China have shown that the tectono- clastic coal is the prerequisite for gas enrichment and coal and gas outburst. The Changcun coalmine in Luan, Shanxi is a gassy coalmine; the enrichment of coal seam gas has large hazard and seriously threatened coalmine safety in production. Based on mine area geological and drilling data, using resistivity well logging combined with seismic inversion and prestack AVO techniques, integrated surveying area tectonoclastic coal development and coal seam gas enrichment geophysical response features predicted coal and gas out- burst hazardous area. The predicted result of Changcun coalmine coal No.5 has shown： ① Coal and gas outburst hazardous area is main- ly distributed in the Laojunzhuang syncline, Jicun syncline and anticline-syncline binding site, consistent with tectonoclastic coal dis- tribution range. ②The distribution of tectonoclastic coal is controlled by stress concentrated zone. ③ Resistivity well logging is sensi- tive to tectonoclastic coal, the result of resistivity inversion to predict tectonoclastic coal features is rather reliable.