Three-dimensional interpretation of sparse survey line MT data: Synthetic examples  

稀疏测线大地电磁资料三维反演研究:合成算例(英文)

作　　者：林昌洪[1,2,3] 谭捍东[1,2,3] 舒晴[4] 佟拓[1,2,3] 张玉玫 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学地下信息探测技术与仪器教育部重点实验室,北京100083 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083 [4]中国国土资源航空物探遥感中心,北京10083 [5]华东冶金地质勘查局812地质队,铜陵244008

出　　处：《Applied Geophysics》2012年第1期9-18,114,共11页应用地球物理（英文版）

基　　金：supported by the National Hi-Tech Research and Development Program of China (863 Program) (No. 2007AA09Z310);National Natural Science Foundation of China (No. 40677037, 40774029, 41004028);Fundamental Research Funds for the Central Universities (No. 2010ZY53); Program for New Century Excellent Talents in University (NCET)

摘　　要：Currently, most of MT （magnetotelluric） data are still collected on sparse survey lines and interpreted using 2D inversion methods because of the field work cost, the work area environment, and so on. However, there are some 2D interpretation limitations of the MT data from 3D geoelectrical structures which always leads to wrong geological interpretations. In this paper, we used the 3D inversion method to interpret the MT sparse lines data. In model testing, the sparse lines data are the MT full information data generated from a test model and processed using the 3D conjugate gradients inversion code. The inversion results show that this inversion method is reasonable and effective. Meanwhile, we prove that for inversion results with different element parameters, the results by joint inversion of both the impedance tensor data and the tipper data are more accurate and closer to the test model.受勘探成本和工区环境等因素的影响,当前大多数大地电磁实际工作采取布置稀疏测线采集数据和使用二维反演方法解释这些稀疏测线数据的方式。然而,二维反演方法在解释三维地电构造数据时存在局限性,有时甚至做出错误的地质解释。本文尝试了使用三维反演方法对大地电磁稀疏测线数据进行反演解释。使用大地电磁全信息资料三维共轭梯度反演程序对理论模型合成稀疏测线数据进行了三维反演。结果表明:这种反演方案是可行与有效的。同时,我们发现在不同数据的三维反演结果中,四个张量阻抗元素和两个倾子数据同时反演的结果相对更为准确,更接近理论模型。

关 键 词：MT sparse lines 3D inversion impedance tensor TIPPER 

分 类 号：P631.325[天文地球—地质矿产勘探] P631.322[天文地球—地质学]