The improvement and applications of the impression method in AMT data processing
KONG Zhi-Zhao1,2, SHAN Ke-She1, WU Yong1, AI Hu1, WANG Ze-Xia1
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, CNNC, Shijiahuang 050002, China;
2. College of Earth Science, Jilin University, Changchun 130000, China
In AMT data processing, inversion model construction determines the final inversion, whereas the inversion model of unreasonable deviation leads to erroneous inversion result. Based on thought of previously proposed impression method, the authors made some improvements in this paper: 2D inversion is conducted by using the average resistivity of one-dimensional TM model as uniform half space model resistivity and then, with the inversion result as the element model, the average resistivity as the auxiliary model, and the theoretical probing depth as theimpression depth, a new inversion model is constructed. Comparative studies of examples show that the methods used in this model can better reflect the corresponding geoelectric structure and achieve the balance and unity in the region, thus exhibiting good application effect.
孔志召, 山科社, 吴勇, 艾虎, 王泽霞. 印模法在AMT数据处理中的改进与应用[J]. 物探与化探, 2015, 39(2): 416-420.
KONG Zhi-Zhao, SHAN Ke-She, WU Yong, AI Hu, WANG Ze-Xia. The improvement and applications of the impression method in AMT data processing. Geophysical and Geochemical Exploration, 2015, 39(2): 416-420.
[1] deGroot-Hedlin C, Constable S.Occam’s inversion to generate smooth, two-dimensional modelsfrom magnetotelluric data[J].Geophysics,1990,55(12):1613-1624.[2] Smith J T,Booker J R.Rapid Inversion of two and three dimensional magnetotelluric data[J].Geophyscis,1991,96(B3):3905-3922.[3] Weerachai Siripunvaraporn, Gary Egbert. An efficient data-subspace inversion method for 2D magnetotelluric data[J].Geophysics,2000,65(3).[4] Mehanee S, Zhdanov M.Two-dimensional magnetotelluric inversion of blocky geoelectrical structures[J].Journal of Geophysical Research,2002,107(84).[5] Rodi W L, Mackie R L.Nonlinear conjugate gradients algorithm for 2-D magnetotelluric inversion[J].Geophysics,2001,66(1).[6] 陈孝雄,王友胜.利用初始模型提高MT反演分辨率[J].江汉石油科技,2006,16(4):19-22.[7] 叶涛,陈小斌,严良俊,等.初始模型对大地电磁二维反演效果的影响研究//第十届中国国际地球电磁学术讨论会,2011.[8] 叶涛,陈小斌,严良俊.大地电磁资料精细处理和二维反演解释技术研究(三)——构建二维反演初始模型的印模法[J].地球物理学报,2013,56(10).[9] 欧阳平宁,王前林.湖南省汝城县秀才洞地区铀成矿条件分析[J].地质论评,2013,59(增刊).[10] 陈明生.关于频率电磁测深几个问题的探讨(二)——频率电磁测深探测深度的几个问题分析[J].煤田地质与勘探,2012,12(6).
