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Seismic Characterisation of Mud-rich Sediments - Application to Seal Risk
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fourth EAGE Shale Workshop, Apr 2014, Volume 2014, p.1 - 5
Abstract
This study demonstrates the possibility of using seismic attributes for texture detection and leakage risk assessment in mud-rich seal units. Single attributes are insufficient to generate comprehensive insights to leakage risk. The proposed multiple attribute approach significantly increases seal characterisation efficiency by taking into account several important factors which increase leakage risk, and also using conditioning attributes as a platform for the calculation of other attributes. In addition, seismically-derived risk attribute (so-called Seal Risk Factor “SRF”) showed robust correspondence to the lithologies within the seismic volume. High seismic SRFs were often a good approximation for volumes containing a higher percentage of coarser-grained and distorted sediments, and vice versa. We believe that this is the first attempt at quantitative 3D seal risk characterisation in mud-rich sediments. Its application on modern seismic surveys can save days of processing/mapping time and can reduce exploration risk by basing decisions on seal texture and their proven link to leakage elements.
Our approach has been applied to regional seals in a case study from West Africa.