CHEN Wei-Ying,
LI Hai,
XUE Guo-Qiang et al
.2017.1D OCCAM inversion of SOTEM data and its application to 3D models.Chinese Journal Of Geophysics,60(9): 3667-3676,doi: 10.6038/cjg20170930
SOTEM数据一维OCCAM反演及其应用于三维模型的效果
陈卫营, 李海, 薛国强, 陈康, 钟华森
中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029
1D OCCAM inversion of SOTEM data and its application to 3D models
CHEN Wei-Ying, LI Hai, XUE Guo-Qiang, CHEN Kang, ZHONG Hua-Sen
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China
Abstract：We propose an OCCAM scheme for inversion of SOTEM data based on the vertical magnetic field component, and applied it to synthetic 3D data and field measured data. This inversion scheme works well for the most 1D models and the inversion results are independent of offsets. The noise has a great influence on the OCCAM inversion, but the results still have good accuracy as long as the noise level is less than 5%. However, if there is a thick conductive layer in the shallow subsurface, the resolution of the OOCAM inversion will be reduced and only the average resistivity of lower strata can be obtained. The 1D inversion scheme applied to 3D data will produce a large error, especially in the edges of the abnormal bodies. The degree of such influence is related to the resistivity contrast between the anomaly bodies and the background. But for the most real earth models whose resistivity approximately changes continuously, the 1D OCCAM inversion still works well. At last, a case study in Shaanxi province is presented to verify the research results of this work.
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