Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 581-593.doi: 10.13278/j.cnki.jjuese.201602302

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MCSEM Responses for Anisotropic Media in Shallow Water

Ben Fang1, Liu Yunhe1, Huang Wei1, Xu Chi2   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Investigation and Design Institute of Water Resources and Hydropower Liaoning Province, Shenyang 110006, China
  • Received:2015-08-31 Published:2016-03-26
  • Supported by:

    Supported by Old Mine Review Project of Ministry of Land and Resources of the People's Republic of China (China Geological Survey Project Agreement[2013] No. 214), National Natural Science Foundation of China (41404093, 41404057) and National High-Tech R&D Program ("863" Program) (2012AA09A20103)

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Abstract:

Due to the impact of air waves, marine CSEM response to oil reservoir is weak in shallow water. Data processing and interpretation in shallow water have long been a hotspot in marine electromagnetic theoretical research. In recent years, with the development of marine CSEM theory, EM data interpretation in shallow water has been improved. However, it is still subject to restriction of fundamental theory. Under this situation, we carry out the research on the effect of electrical anisotropy to MCSEM data in shallow water. We use Euler rotation to establish different anisotropic models for seabed media. Through using the staggered grid finite-difference method to calculate marine CSEM responses in shallow water, we analyze the characteristics of amplitude, phase of inline Ex component, and current density. The physical mechanism of the anisotropic effect on the response of oil reservoir has also been analyzed. We conclude that the characteristics of marine CSEM responses in shallow water are different from that in deep water, and attentions should be paid to the differences when interpreting and inversing the marine CSEM data in shallow water. This research can provide a guideline for marine CSEM data interpretation in shallow water and promote marine CSEM data interpretation in shallow water.

Key words: offshore oil reservoir, marine CSEM, 3D modeling, finite-difference, arbitrary electrical anisotropy

CLC Number: 

  • P631.3

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