Transient electromagnetic exploration in loess layer,Western China
Hu Zuzhi1,3, Shi Yanling2,3, He Zhanxiang3, Jiang Zhongcheng3, Yang Yunjian3, and Hu Xiangyun1
1. Institute of Geophysics & Geomatics, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China;
2. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
3. BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：The topography of foreland thrust zones in southwest part of Tarim Basin is rather complicated. Thick and unequal loess layers cause serious problems for seismic static corrections. On the other hand,local electrical inhomogeneous bodies in the complex surface bring another problem:static shift in magnetotelluric (MT) data is common. Since transient electromagnetic method (TEM) can get high resolution data in shallow area without static shifts,a TEM was deployed at the same time and site as a 3D MT exploration was conducted. The purpose of this TEM is to reveal the distribution and tendency of the loess layers, to provide the basis of shallow velocity model building for seismic static corrections,and to give references for MT static corrections. As a result of the TEM data,the static shift in 3D MT data is well suppressed,which provides great help for 3D MT structure interpretation. Furthermore,the thickness distribution of the loess layer in piedmont of western mountains is delineated with the TEM inversion result,and loess layer thickness calculated on TEM data and uphole data is similar.
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