Petroleum exploration using controlled-source electromagnetic methods
Article Abstract:
Controlled-source electromagnetic (CSEM) geophysical exploration methods utilizing man-made EM signal sources offers several advantages over natural-source EM (NSEM) technologies for such applications as petroleum exploration. A known magnetic or electric current, typically at 0.1Hz to 10KHz, is induced with grounded line or horizontal loop source devices. Receiver devices detect and measure the resulting electromagnetic fields in either the frequency or time domain, isolating respectively, amplitude and phase of the received signal or transient decay of the signal. 1-D, 2-D and 3-D modeling and inversion of CSEM data are described. CSEM offers several advantages over NSEM methods, including relative insensitivity to regional or near-surface effects and ability to use different signal source types and orientations. Several applications and current research are described.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
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Approximations for electromagnetic scattering by homogeneous arbitrarily-shaped bodies
Article Abstract:
Two methods are developed for computing the electromagnetic scattering of inhomogeneous, arbitrarily shaped particles: the Eikonal Model and the Low-Energy Model. The Eikonal Model is used for targets that are much greater in size than the incident wavelength. The model computes the diffracted intensity in the entire angular domain, while accounting for the surface topology of the scattering objects. The Low-Energy Model computes the scattering by dielectric particles whose size is comparable to the incident wavelength. The method models the targets an array of polarisable dipolar units on the interstices of a cubic lattice. Details of the development, underlying equations, and applications of the two models are described.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1989
User Contributions:
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