Time-frequency electromagnetic(TFEM) technique: step-by-step constraint inversion based on artificial fish swarm algorithm
HE Zhanxiang1,2,3, HU Zuzhi4, WANG Zhigang4, ZHAO Yunsheng1, SHEN Yibin1,3, LIU Xuejun4
1. SUSTech Academy for Advanced Interdisciplinary Studies, Shenzhen, Guangdong 518055, China; 2. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou, Guangdong 511458, China; 3. Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology, Department of Earth and Space Science, SUSTech, Shenzhen, Guangdong 518055, China; 4. GME & Geochemical Surveys, BGP, CNPC, Zhuozhou, Hebei 072751, China
Abstract：In oil and gas exploration,time-frequency electromagnetic (TFEM) inversion can use more known data. It is of great significance to make full use of known data and effectively reduce the non-uniqueness of inversion. Based on the artificial fish swarm algorithm,we developed an objective function for TFEM inversion under joint constraints of horizontal electric field and vertical magnetic field,designed three kinds of model spaces including layer thickness,resistivity and polarization for suitably constraining horizon parameters,proposed the methods and rules for setting model space with the purpose of making full use of known data,and developed step-by-step constrained inversion schemes for three types of models. These measures effectively reduce the non-uniqueness of inversion and improve inversion accuracy. Model and real data tests have proved that the artificial fish swarm algorithm and step-by-step constrained inversion schemes can reduce the non-uniqueness and ensure exploration accuracy and effect,so it can be used widely.
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