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6 - Marine Electromagnetic Methods
- By Lucy M. MacGregor
Edited by Hamish Wilson, Keith Nunn, Matt Luheshi
Book:

Integration of Geophysical Technologies in the Petroleum Industry

Published online:

25 November 2021

Print publication:

16 December 2021, pp 169-219
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Summary

Marine electromagnetic (EM) methods can be used to determine the resistivity of the subsurface, which can in turn be used to investigate bothstructure and properties of the subsurface.Natural source magnetotelluric (MT) and controlled source electromagnetic (CSEM) methods have been applied to a range of exploration and exploitation problems. In areas of complex geology where seismic can struggle to produce a clear subsurface image, both CSEM and MT have been applied to improve velocity model building and hence improve the final migrated image.In reservoir characterisation problems, CSEM derived resistivity provides a valuable complement to seismically derived acoustic and elastic properties, and has been shown to reduce interpretation ambiguity, particularly in the case of hydrocarbon saturation uncertainty.In all cases, a careful multiphysics approach, in which marine EM methods are integrated with seismic and other geophysical methods, provides the most robust result.