- 责任者：Yang Bo (Institute of Geophysics and Geomatics ; China University of Geosciences ; Wuhan 430074 ; China) ; Xu Yixian
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(4)
- 关键词：可控源音频大地电磁法 ; controlled-source audio magnetotelluric methods ; 海洋物探 ; marine geophysical exploration
- 页码：p.1390-1399
- 图表：4 illus., 28 tables, 4 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
class="MsoNormal" style="margin: 0cm 0cm 0pt;">In
this paper, the authors present an algorithm for modeling the 3D
frequency-domain marine controlled-source electromagnetic（CSEM） response by using the
finite volume method. In this paper, the formulae of the discrete form of the
governing equation have been deduced in details. Comparison of the discrete
formulae of the finite volume method（FVM） with the finite difference
method（FDM） shows that FVM is
more accurate, while it is as efficient as FDM. The weighted mean conductivity
of the seawater and the sediment, which is calculated by using two volumes
divided by the interface as the weightings, are set to be the conductivities of
the cells on the terrain interface. The numerical modeling shows that the
weighting processes of the terrain interface can improve the accuracy of the
terrain effects of CSEM. An oil reservoir with bathymetry variation has been
simulated by our code. The modeling result demonstrates that the electric field
is influenced by the terrain, however, the magnetic field is insensitive to the
bathymetry.