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| Keywords | |
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CSAMT |
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constrained inversion |
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OCCAM |
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logging data |
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inversion accuracy |
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Research and application on CSAMT constraint inversion
HE Rongqin1,2, YU Qingshui3, LI Jing1,2, SONG Erqiao1,2
1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China;
2. Key Laboratory of Applied Geophysics, Ministry of Land and Resources of PRC, Changchun 130026, China;
3. CPECC Northeast Electric Power Design Institute Co, Ltd, Changchun 130021, China
In this paper, according to the method of electrical constraint inversion, we can improve the accuracy of inversion interpretation using the constraint of electrical logging data in the inversion process, which is conducive to obtain more abundant geoelectric information. On the basis of the conventional OCCAM inversion algorithm, the model roughness in the objective function is improved, and the formula of the electrical constraint inversion iterative algorithm is derived in detail based on the modified objective function. Taking the geothermal exploration in Changbai Mountain area as an example, the measured CSAMT data are used as the resistivity model for inversion, and the electrical property is constrained by the actual data from wells drilled in the section. It can be found that the method of electrical constraint inversion can improve the accuracy of inversion interpretation and guide the development of constrained inversion methods in different ways.