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Study on 1D forward modeling of marine CSEM survey
Author(s) -
Ju Hanji,
Fang Guangyou,
Zhang Feng,
Lin Zhiwei,
Ji Yicai,
Huang Ling
Publication year - 2011
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.829
Subject(s) - geology , computer science
SUMMARY The two‐level discrete complex image method (DCIM) is successfully introduced into the marine controlled‐source electromagnetic (MCSEM) survey. The original integral path does not hold valid in extremely low‐frequency situation, and the reason can be ascribed to the change of wave number at different frequencies. The new integral path suitable for the extremely low‐frequency situation is proposed. This paper focuses on the selection of parameters, including the sampling space, the sampling number, and the number of exponential terms. The study shows that the effects of these parameters are different on different paths. The appropriate ranges of these parameters are proposed. In order to validate the DCIM, we calculated the electric field of a five‐layer model under different frequency situations. The electric field attenuates faster with frequency increase. The effect of oil‐layer conductivity is studied, and the results show that the electric field is stronger with lower oil conductivity. All the results accord to the physical meanings of MCSEM. The model with multiple objects is studied to find the effect of shallow resistor on the detection ability of MCSEM. Copyright © 2011 John Wiley & Sons, Ltd.