A comparative analysis of Ex apparent resistivity and Ex/Hy ratio apparent resistivity in CSAMT
WAN Wei1,2, TANG Xin-Gong1,2
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan 430100, China;
2. Department of Geophysics and Petroleum Resource, Yangtze University, Wuhan 430100, China
Currently, the adoption of the ratio of electric field and magnetic field to calculate the Cagniard resistivity is widely used in traditional CSAMT exploration. However, an analysis of the electromagnetic field components and the apparent resistivity definition method in homogeneous half space and layered media indicates that the apparent resistivity defined by electric field Ex component can improve the problem of the near zone distortion of ratio apparent resistivity. Moreover, the advantage of apparent resistivity defined Ex component has been further verified by the measured field data. Therefore it's not necessary to rigidly stick to using the ratio apparent resistivity in the field CSAMT data acquisition, and the acquisition mode flexibility can be adjusted according to actual conditions so as to improve work quality and efficiency.
万伟, 唐新功. CSAMT中Ex视电阻率与Ex/Hy比值视电阻率的对比[J]. 物探与化探, 2015, 39(3): 567-571.
WAN Wei, TANG Xin-Gong. A comparative analysis of Ex apparent resistivity and Ex/Hy ratio apparent resistivity in CSAMT. Geophysical and Geochemical Exploration, 2015, 39(3): 567-571.