瞬变电磁法在新集一矿水文地质勘探中的应用
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摘要
淮南新集矿区太原组承压含水层的水文地质条件,是开采山西组1号煤的关键因素。以前曾通过布设少量水文钻孔及三维地震等手段进行勘查,但因太原组含水层是岩溶裂隙型,勘查结果并不理想,其水文钻孔涌水量一般都较小,但邻近矿井在对山西组煤层试采中却发生了严重的突水事故。为此,本次在采用地面电法勘探方法对矿区进行水文地质勘查,以划分太原组上段相对富水区域,并据此进行水文钻孔布置。由于新集一矿1号煤埋藏深度大地表存在巨厚的推覆构造,在分析该区物性资料的基础上,对瞬变电磁法的施工参数进行了试验,最终确定了线框边长、发射频率及固定增益等参数。经处理解释,初步查明勘探区1号煤下伏太灰岩的水文地质特征,结合前期地质资料分析,划定了该矿区富水区域,认为太灰岩上段的1～4灰是开采1号煤底板突水的主要威胁。
The hydrogeological condition of the Taiyuan Formation limestone confined aquifer is the key impact factor to mine the No.1 coal seam in the Shanxi Formation.In before,exploration has been carried out with a few hydrogeological boreholes and 3D seismic prospecting,since the limestone aquifer belongs to karstic fissured type,the exploration result is dissatisfactory.Although borehole outflow rate is rather small according to hydrogeological drilling,but serious water bursting has been happened in a pilot mining of Shanxi formation coal seam in a neighboring coalmine.Thus surface electric method has been used in Xinji mine area to carry out hydrogeological exploration,and work out relative water rich sector in Upper Member of Taiyuan Formation,hereby hydrogeological drilling lay out.Since the buried depth of No.1 coal seam in Xinji No.1 coalmine is rather deep,major nappe structure has been found on surface,based on physical property analysis data tested operational parameters of TEM method,finally determined parameters of square loop side length,emission frequency and fixed-gain etc.After processing and interpretation,preliminary found out hydrogeological characteristics of underlying Taiyuan Formation limestone,combined with previous geological data,worked out water rich zone in the mine area,considered that the Nos.1～4 limestone layers in Upper Member,Taiyuan Formation are the main threat of water bursting to mine No.1 coal seam.
The hydrogeological condition of the Taiyuan Formation limestone confined aquifer is the key impact factor to mine the No.1 coal seam in the Shanxi Formation.In before,exploration has been carried out with a few hydrogeological boreholes and 3D seismic prospecting,since the limestone aquifer belongs to karstic fissured type,the exploration result is dissatisfactory.Although borehole outflow rate is rather small according to hydrogeological drilling,but serious water bursting has been happened in a pilot mining of Shanxi formation coal seam in a neighboring coalmine.Thus surface electric method has been used in Xinji mine area to carry out hydrogeological exploration,and work out relative water rich sector in Upper Member of Taiyuan Formation,hereby hydrogeological drilling lay out.Since the buried depth of No.1 coal seam in Xinji No.1 coalmine is rather deep,major nappe structure has been found on surface,based on physical property analysis data tested operational parameters of TEM method,finally determined parameters of square loop side length,emission frequency and fixed-gain etc.After processing and interpretation,preliminary found out hydrogeological characteristics of underlying Taiyuan Formation limestone,combined with previous geological data,worked out water rich zone in the mine area,considered that the Nos.1～4 limestone layers in Upper Member,Taiyuan Formation are the main threat of water bursting to mine No.1 coal seam.
引文
[1]蒋邦远.瞬变电磁法勘探[M].北京:地质出版社,1998.
[2]谢苗诺夫A.C,傅良魁,等.电法勘探文集[M].北京:地质出版社,1958.
[3]张运霞,韩自豪,周建雄,等.瞬变电磁法在煤层水探测中的应用[J].中国煤田地质,2005,17(6).
[4]龚惠民,查文相,等.瞬变电磁法在断裂构造上的异常反映[J].中国煤田地质,2002,14(3).
[2]谢苗诺夫A.C,傅良魁,等.电法勘探文集[M].北京:地质出版社,1958.
[3]张运霞,韩自豪,周建雄,等.瞬变电磁法在煤层水探测中的应用[J].中国煤田地质,2005,17(6).
[4]龚惠民,查文相,等.瞬变电磁法在断裂构造上的异常反映[J].中国煤田地质,2002,14(3).
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