大定源瞬变电磁法在含水断层构造探测中的应用
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摘要
针对黄土层及松散砂层覆盖厚度较大地区的三维地震探测断层构造效果欠佳问题,在山西大同煤田右玉矿区进行了瞬变电磁法探测含水断层构造的工程尝试。已知区域的前期试验结果表明:上下两盘存在电性差异或充水断层构造在视电阻率断面图上表现为等值线向下弯曲,电性层错动;不同落差的断层等值线弯曲程度不同,落差越大,等值线弯曲程度越大。基于此,勘探区内推断解释断层49条,目前5条断层在井巷掘进过程中得到验证,揭露结果与推断解释基本一致,方法有效性得到验证。
In areas covered by thick loess and looses sand,3D seismic is inefficient in detecting fault structure.In view of this situation,an engineering try by using TEM method to detect the fault structure was done in Youyu mine.The grid is 40 m × 20 m and the exploration area is 2.5 km2.The preliminary test result of the area with known fault structures indicates that the fault structure where the up and down sides have electrical difference or are filled with water shows bending-down contour and electrical layer dislocation of electric layer in apparent resistivity section;the contours of fault with different drop bend in different degree,the contours bend more greatly if the drop is bigger.Based on this,49 faults are interpreted in the exploration area.At present,5 faults have been proved during the roadway excavation and the revealed result is coincident with interpretation,so effectiveness of the method gets verified.
In areas covered by thick loess and looses sand,3D seismic is inefficient in detecting fault structure.In view of this situation,an engineering try by using TEM method to detect the fault structure was done in Youyu mine.The grid is 40 m × 20 m and the exploration area is 2.5 km2.The preliminary test result of the area with known fault structures indicates that the fault structure where the up and down sides have electrical difference or are filled with water shows bending-down contour and electrical layer dislocation of electric layer in apparent resistivity section;the contours of fault with different drop bend in different degree,the contours bend more greatly if the drop is bigger.Based on this,49 faults are interpreted in the exploration area.At present,5 faults have been proved during the roadway excavation and the revealed result is coincident with interpretation,so effectiveness of the method gets verified.
引文
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[11]张成范,翁爱华,孙世栋,等.计算矩形大定源回线瞬变电磁测深全区视电阻率[J].吉林大学学报(地球科学版),2009,39(4):755-758.
[12]冯兵,孟小红,张斌.TEM框内回线装置发射框边界影响及消除方法[J].煤田地质与勘探,2010,38(5):61-66.
[13]闫述,薛国强,陈明生.大回线源瞬变电磁响应理论研究回顾及展望[J].地球物理学进展,2011,26(3):941-947.
[14]薛国强,闫述,周楠楠.偶极子假设引起的大回线源瞬变电磁响应偏差分析[J].地球物理学报,2011,54(9):2389-2396.
[2]田忠斌.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):54-56.
[3]田忠斌.三维地震及电法综合勘探在晋西北黄土区的应用[J].中国煤田地质,2008,20(11):64-66.
[4]郭文波,宋建平.回线源瞬变电磁法在地质灾害调查中的应用[J].物探与化探,2006,30(4):327-329.
[5]宋国阳.瞬变电磁法在地质勘探中的应用[J].煤炭技术,2009,28(11):136-137.
[6]谢国强,宋建平.用瞬变电磁法识别地下电性分界面[J].煤田地质与勘探,2003,31(5):49-51.
[7]嵇艳鞠,林君.ATEM瞬变电磁系统在长春活断层勘探中的应用[J].吉林大学学报,2005,35:99-103.
[8]石显新.瞬变电磁法勘探中的低阻层屏蔽问题研究[D].西安:中煤科工集团西安研究院,2005:18-22.
[9]薛国强,李貅,郭文波,等.大回线源瞬变电磁场响应特性[J].石油地球物理勘探,2007,42(5):586-590
[10]石显新,闫述,傅君眉,等.瞬变电磁法中心回线装置资料解释方法的改进[J].地球物理学报,2009,52(7):1931-1936.
[11]张成范,翁爱华,孙世栋,等.计算矩形大定源回线瞬变电磁测深全区视电阻率[J].吉林大学学报(地球科学版),2009,39(4):755-758.
[12]冯兵,孟小红,张斌.TEM框内回线装置发射框边界影响及消除方法[J].煤田地质与勘探,2010,38(5):61-66.
[13]闫述,薛国强,陈明生.大回线源瞬变电磁响应理论研究回顾及展望[J].地球物理学进展,2011,26(3):941-947.
[14]薛国强,闫述,周楠楠.偶极子假设引起的大回线源瞬变电磁响应偏差分析[J].地球物理学报,2011,54(9):2389-2396.
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