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Migration Velocity Analysis Combining Reflected and Direct Waves in a Crosswell Configuration
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition - Workshops, Jun 2015, Volume 2015, p.1 - 4
Abstract
Summary
Migration Velocity Analysis is classically restricted to reflected wave fields. In Crosswell Seismic Profiling (CSP) configuration, transmitted waves are usually considered. Here, in a CSP configuration, we combine direct and reflected waves in order to perform a Migration Velocity Analysis. The idea is to take advantage of the different illuminations of the subsurface provided by these different wave fields. The velocity update shows that the part related to reflected waves mainly emphasizes zones around reflectors, whereas transmitted waves illuminate the subsurface in a more homogeneous way. We discuss in a heterogeneous faulted model an automatic velocity method, based on different waves, separately or combined.
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