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Enhancing coherency analysis for fault detection and mapping using 3D diffraction imaging

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Open access
Authors
Vermeulen, J.
Gurevich, Boris
Urosevic, Milovan
Landa, E.
Date
2006
Type
Conference Paper

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Vermeulen, J. and Gurevich, B. and Urosevic, M. and Landa, E. 2006. Enhancing coherency analysis for fault detection and mapping using 3D diffraction imaging, in Proceedings of the International Exposition and 76th Annual Meeting, Oct 1-6 2006, pp. 1108-1112. New Orleans, Louisiana: SEG.
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Society of Exploration Geophysicists - SEG International Exposition and 76tth Annual Meeting 2006, SEG 2006
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WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
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Use of this publication is subject to SEG terms of use and conditions at https://seg.org/Terms-of-Use

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Abstract

Automatic detection of geological discontinuities such as small throw faults, and pinch-outs is an important problem in the interpretation of 3D seismic data. This is commonly done using coherency analysis. However coherency may be affected by noise, which may create false anomalies. We propose a new interpretation workflow for the detection and mapping of faults, which enhances the coherency-type analysis with identification and detection of diffractions produced by the discontinuities. The algorithm utilizes migrated and unmigrated stacked seismic volumes and the cube of stacking (NMO) velocities. Tests on a simple 2.5 D model show that the method is capable in detecting and mapping of faults below seismic resolution.