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2.5D Polygon-based Inversion of Marine EM Data over Diapirs
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EGM 2010 International Workshop, Apr 2010, cp-165-00026
Abstract
Practical experience and published well logs show that shale diapirs are conductive relative to the surrounding sediments. When these are close to the mud line, significant distortion of CSEM data occurs, rendering inversion with minimum-structure techniques difficult. We present here an approach, developed at Schlumberger-Doll Research Center, in which a sharp-boundary technique with closed polygons is used to work around the intrinsic limitations of smooth-regularized inversion algorithms, in the presence of near-vertical resistivity inhomogeneities near the mudline.