期刊
JOURNAL OF GEOPHYSICS AND ENGINEERING
卷 5, 期 4, 页码 438-447出版社
IOP PUBLISHING LTD
DOI: 10.1088/1742-2132/5/4/007
关键词
multigrid; integral equation method; large-scale; inhomogeneous background conductivity
资金
- University of Utah Consortium for Electromagnetic Modeling and Inversion (CEMI)
- BAE Systems
- Baker Atlas Logging Services
- BGP China National Petroleum Corporation
- BHP Billiton World Exploration Inc.
- BP, Centre for Integrated Petroleum Research
- EMGS
- ENI S.p.A.
- ExxonMobil Upstream Research Company
- FUGRO, Halliburton
- INCO Exploration
- Information Systems Laboratories
- Newmont Mining Co.
- Norsk Hydro
- OHM
- Petrobras
- PGS
- Rio Tinto-Kennecott
- Rocksource
- Russian Research Center Kurchatov Institute, Schlumberger
- Science Applications International Co.
- Shell International Exploration and Production Inc.
- Statoil, Sumitomo Metal Mining Co.
- Zonge Engineering and Research Organization
We present a multigrid integral equation (IE) method for three-dimensional (3D) electromagnetic ( EM) field computations in large-scale models with inhomogeneous background conductivity (IBC). This method combines the advantages of the iterative IBC IE method and the multigrid quasi-linear (MGQL) approximation. The new EM modelling method solves the corresponding systems of linear equations within the domains of anomalous conductivity, D(a), and inhomogeneous background conductivity, D(b), separately on coarse grids. The observed EM fields in the receivers are computed using grids with fine discretization. The developed MGQL IBC IE method can also be applied iteratively by taking into account the return effect of the anomalous field inside the domain of the background inhomogeneity Db, and vice versa. The iterative process described above is continued until we reach the required accuracy of the EM field calculations in both domains, D(a) and D(b). The method was tested for modelling the marine controlled-source electromagnetic field for complex geoelectrical structures with hydrocarbon petroleum reservoirs and a rough sea-bottom bathymetry.
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