基于EH4和地震法在勘探中的联合解释应用  

Combined explanation and application dased on EH4 and earthquake method in exploration

作　　者：陈鑫[1] 郭奇[1] 宋伟健 李丛 杨嘉明[1] CHEN Xin;GUO Qi;SONG Jian-wei;LI Cong;YANG Jia-ming

机构地区：[1]中水东北勘测设计研究有限责任公司,吉林长春130021 [2]河南省地矿局测绘地理信息院,河南郑州450000

出　　处：《东北水利水电》2019年第12期48-51,72,共5页Water Resources & Hydropower of Northeast China

摘　　要：西藏地区地质结构复杂,地势险峻,随着对藏区日趋提高的勘探要求且数据不易进行采集的情况,工程物探勘探方法亟待利用新方法新思路,来解决当下的工程勘探需求。EH4大地电磁法主要是针对大深度、复杂地层探测,较适用于藏区获取深层地层结构信息,但存在精度不高和盲区过大的特性。同时联合利用地震反射法拾取地下结构的速度差异性,判断地质构造和获取地层信息,联合解释地质地下结构,从而达到更精准探测、更准确解释地质地层和结构构造的目的。The Tibet has complicated geological structure and precipitous terrain. According to the improving requirements of exploration day by day and the difficult situation of the data collection, the engineering geophysical prospecting need new method and idea to meet the current requirements. The EH4 magnetotelluric method is aimed at the large depth and complicated stratum detection and is suitable for getting deep stratum structure in Tibet. But its accuracy is low and the blind zone is large. Combined using the magnetotelluric method and the seismic reflection method, the difference of velocity of the subsurface structure is picked up,which could judge the geological structure and gained the stratum information, jointly explain the subsurface geological structure,and then achieve the objectives of accurately detecting and explaining the geology, stratum and structure.

关 键 词：EH4 大地电磁法 地震反射法 速度拾取 覆盖层厚度 勘探 西藏 勒珠水电站 

分 类 号：TV221.2[水利工程—水工结构工程]