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Technical Abstract

Non-linear scanning tomography for velocity model building in seismic-obscured area

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A new non-linear tomographic inversion based method is put forward to resolve large velocity errors associated with complex geology which can cause poor imaging or migration artifacts. We propose to first create a series of trial-velocities from initial velocity by varying the values inside poor imaging zone. Migrations are followed using these trial velocities. The second stage involves CIG picking on these migrated gathers/stacks with tight constraint to ensure reliable picks. These CIG picks are then de-migrated to invariants with their corresponding trial velocities to form a set of invariants as the input to non-linear tomographic inversion.
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Publications

SEG - Society of Exploration Geophysicists

Authors

Zongying Gong, Xiaodong Wu, Yunung Nina Lin, CGG; Nick Benfield, and Juan Pi Alperin, Shell

Month

October

Copyright

© 2018 SEG