An improved interpolation scheme at receiver positions for 2.5D frequency‐domain marine controlled‐source electromagnetic forward modelling

ABSTRACT An improved interpolation scheme is presented for 2.5‐dimensional marine controlled‐source electromagnetic forward modelling. For the marine controlled‐source electromagnetic method, due to the resistivity contrast between the seawater and seafloor sedimentary layers, it is difficult to com...

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Bibliographic Details
Published in:Geophysical Prospecting 2020-06, Vol.68 (5), p.1657-1675
Main Authors: Li, Gang, Duan, Shuangmin, Cai, Hongzhu, Han, Bo, Ye, Yixin
Format: Article
Language:English
Subjects:
2.5D
Computer simulation
Domains
Electromagnetic fields
Electromagnetics
Electromagnetism
Fields
Finite difference methods
Interpolation
Modelling
Numerical study
Ocean floor
Receivers
Seawater
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Summary:ABSTRACT An improved interpolation scheme is presented for 2.5‐dimensional marine controlled‐source electromagnetic forward modelling. For the marine controlled‐source electromagnetic method, due to the resistivity contrast between the seawater and seafloor sedimentary layers, it is difficult to compute the electromagnetic fields accurately at receivers, which are usually located at the seafloor. In this study, the 2.5‐dimensional controlled‐source electromagnetic responses are simulated by the staggered finite‐difference method. The secondary‐field approach is used to avoid the source singularities, and the one‐dimensional layered background model is used for calculating the primary fields excited by the source quasi‐analytically. The interpolation of electromagnetic fields at the cell nodes for the whole computational domain to the receiver locations is discussed in detail. Numerical tests indicate that the improved interpolation developed is more accurate for simulating the electromagnetic responses at receivers located at the seafloor, compared with the linear or rigorous interpolation.
ISSN:0016-8025
1365-2478
DOI:10.1111/1365-2478.12937