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Zero-Offset Sections with a Deblurring Filter in the Time DomainNormal access

Authors: S. Feng, O. Yilmaz and Y. Chen
Event name: First EAGE/SBGf Workshop on Least-Squares Migration
Session: Theory and Implementation I
Publication date: 27 November 2018
DOI: 10.3997/2214-4609.201802942
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 979.48Kb )
Price: € 20

Summary:
We present a velocity independent workflow for constructing a zero-offset reflection section that preserves most of the reflections and diffractions. This workflow constructs a migration image volume by prestack time migration (PSTM) using a series of constant-velocity models. A deblurring filter for each constant-velocity model is applied to each time migration image to get a deblurred image volume. In order to preserve all events in the image volume, each deblurred image panel is demigrated and then summed over the velocity axis. The resulting demigration section is equivalent to a zero-offset reflection section. Compared with the workflow without deblurring filter, the composite zero-offset reflection section has higher resolution. A more accurate estimate of the velocity distribution can be obtained from this workflow using time-migration velocity analysis, which can then used as the velocity model to migrate the zero-offset section. Numerical tests are used to validate the effectiveness of this method with 3D synthetic data.


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