三维地震及电法综合勘探在晋西北黄土区的应用
|
摘要
晋西北某矿井位于吕梁山黄土塬区,为年产500万t的特大型在建矿井,为查明首采区煤层赋存条件、地质构造情况、以及奥灰与主要含水层的富水性,对该区进行了三维地震及电法综合勘探。其中三维地震勘探查明了勘探区内4#、9#煤层的埋藏深度和起伏形态,解释断层18条,陷落柱4个,褶曲1条,煤层倾角大于15°的区段1处;运用瞬变电磁法结合直流电测深法查明K6、K5砂岩富水异常29处、4#、7#、9#煤顶板岩层富水异常51处,奥灰顶界面—100m富水异常18处。三维地震及电法的综合勘探,不仅解释了该区主要煤层的厚度变化趋势及基岩面和奥灰顶界面深度变化情况,还对落差大于5m断层、直径大于25m陷落柱、煤层、奥灰水以及主要含水层的富水情况、导通关系及相互间的水力联系进行了分析,其结论为解决矿井建设和开采中的地质难题,提供了可靠的地质信息。
To find out initial winning district coal seam hosting condition,geological structure and water yield property of Ordovician limestone and other main aquifers of a coalmine with 5 million ton annual output in the northwest Shanxi Luliang Mountains loess tableland,integrated 3D seismic and electric prospecting were carried out.The 3D seismic exploration method has identified Nos.4 and 9 coal seams' burial depth and undulation in the region,18 faults,4 subsided columns,a fold,and a section with coal seam dip angle >15° interpreted.The integrated transient electromagnetic and DC electric sounding method have identified 29 K6 and K5 sandstone water yield property anomalies,51 Nos.4,7 and 9 coals roof strata water yield property anomalies,18 Ordovician top surface-100m water yield property anomalies.The integrated seismic and electric prospecting not only interpreted main coal seams thickness changing trend,depths of bedrock,Ordovician limestone top surface variation,but also analyzed faults with throw >5m,subsided column with diameter >25m,water yield properties,conduction and mutual hydraulic relations between coal seam,Ordovician limestone water and main aquifers.The conclusion has provided reliable geological information to settle geological issues in mine construction and mining.
To find out initial winning district coal seam hosting condition,geological structure and water yield property of Ordovician limestone and other main aquifers of a coalmine with 5 million ton annual output in the northwest Shanxi Luliang Mountains loess tableland,integrated 3D seismic and electric prospecting were carried out.The 3D seismic exploration method has identified Nos.4 and 9 coal seams' burial depth and undulation in the region,18 faults,4 subsided columns,a fold,and a section with coal seam dip angle >15° interpreted.The integrated transient electromagnetic and DC electric sounding method have identified 29 K6 and K5 sandstone water yield property anomalies,51 Nos.4,7 and 9 coals roof strata water yield property anomalies,18 Ordovician top surface-100m water yield property anomalies.The integrated seismic and electric prospecting not only interpreted main coal seams thickness changing trend,depths of bedrock,Ordovician limestone top surface variation,but also analyzed faults with throw >5m,subsided column with diameter >25m,water yield properties,conduction and mutual hydraulic relations between coal seam,Ordovician limestone water and main aquifers.The conclusion has provided reliable geological information to settle geological issues in mine construction and mining.
引文
[1]田忠斌,王建青,张胤彬.三维地震勘探在干厚黄土浅煤层地区的应用[J].中国煤田地质,2004,16(3).
[2]唐建益,方正.煤矿采区实用地震勘探技术[M].北京:煤炭工业出版社,1998.
[3]蒋邦远.瞬变电磁法勘探[M].北京:地质出版社,1998.
[2]唐建益,方正.煤矿采区实用地震勘探技术[M].北京:煤炭工业出版社,1998.
[3]蒋邦远.瞬变电磁法勘探[M].北京:地质出版社,1998.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心