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Estimation of Velocity-Depth Models for 3D Structural Targets - a Case Study from the North SeaNormal access

Authors: O. Yilmaz, J. Rutledge, O. Sandvin, P. Farmer and R. Roberts
Event name: 57th EAGE Conference and Exhibition
Session: Migration II
Publication date: 29 May 1995
DOI: 10.3997/2214-4609.201409253
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 265.53Kb )
Price: € 20

Summary:
Three-dimensianal seismic data from the North Sea were analyzed to obtain an accurate depth structure map of the top Rotliegendes formation in the survey area. This required estimation of a 3-D velocity-depth model above the Zechstein diapiric formation and removal of its deleterious effect on the underlying Permian Bands of Rotliegendes and deeper targets. We used coherency inversion based on 3-D-prestaclc traveltime inversion to estimate lager velocities and 3-D poststack depth migration to delineate reflector geometries. We also want to use 3-D prestack depth migration and analyze image gathers to estimate a vetocity-depth model and verify it for the substratum which includes the Zechstein and underlying formations.


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