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《Chinese Journal of Geophysics》 2017-05
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2D CSAMT finite element simulation of anisotropic formation with an infinite source

XIONG Zhi-Tao;TANG Xin-Gong;Key Laboratory of Exploration Technologies for Oil and Gas Resources of MOE,Yangtze University;Hubei Cooperative Innovation Center of Unconventional Oil and Gas;  
The controlled source audio-frequency magnetotellurics(CSAMT) is traditionally based on the electrical isotropic theory. However, it has been well recognized that the electrical anisotropic is widely present in the earth interior. So it is significant theoretically and practically to calculate EM responses with anisotropic earth model. Based on Maxwell equations with source terms, EM responses to an infinite linear source in 2 D anisotropic formation in the frequency domain are derived. A set of partial differential equations of the electric field component E_x and the magnetic field component H_x parallel to the linear source direction are obtained and solved by the finite element method. The results indicate that the isotropic background and anisotropic anomalous body can be clearly figured out by calculating the 2 D anisotropic anomalous body in either homogeneous half-space or one-dimensional layered media. When changing the anisotropic coefficients and rotation angle from main electrical axis of the anisotropic model, the results are obviously different from the anisotropic case in both apparent resistivity and impedance phase curves. The results indicate that errors will be very large if we still use electrical isotropic theory when dealing with CSAMT data in anisotropic media. In such situation, the calculation should be based on anisotropic theory instead of electrical anisotropic one. The result is significant for improvement of the application of the CSAMT method to exploration.
【Fund】: 国家自然科学基金项目(41274115 41674107 41574064 41404087);; 国家重点基础研究发展计划(973)项目(2013CB228605)联合资助
【CateGory Index】: P631.325
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