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The AAPG/Datapages Combined Publications Database

Southeast Asia Petroleum Exploration Society (SEAPEX)

Abstract


Proceedings of the South East Asia Petroleum Exploration Society Volume VIII, 1988
Pages 37-46

VSP Guided Reprocessing and Inversion of Surface Previous HitSeismicNext Hit Data

R. Gir, Dominique Pajot, Serge Des Ligneris

Abstract

Surface Previous HitseismicNext Hit data is usually processed in isolation from either log or borehole Previous HitseismicNext Hit data. As a result, there is often an inconsistency between these data sets. To improve the quality of the surface Previous HitseismicNext Hit data, VSP guided reprocessing is performed on an interactive workstation. This paper presents the method of residual reprocessing of surface Previous HitseismicNext Hit data and application of the technique to Real Data from offshore South-East-Asia.

In example 1, a weighted average Previous HitphaseNext Hit rotation of 46 degrees has been applied to the Previous HitseismicNext Hit data to reconcile the surface Previous HitseismicNext Hit with logs and VSP data at the well location. The gas/oil contact that was barely visible on the original Previous HitseismicNext Hit is better defined in the reprocessed Previous HitseismicNext Hit data. Also, the oil/water contact is enhanced and its lateral continuity better defined.

In example 2, residual reprocessing using a 60 degree Previous HitphaseNext Hit rotation is applied to the data to restore zero Previous HitphaseNext Hit prior to 2- D Previous HitseismicNext Hit inversion processing. The validity of the results predicted by the inversion is proved by the agreement obtained away from the reference well, between the Previous HitseismicTop derived acoustic impedance traces and acoustic impedance logs from two additional wells.


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