Technical Paper: Seismic Re-Processing and Q-FWI Model Building to Optimise AVO and Resolution in the Shallow Wisting Discovery

Society: EAGE
Paper Number: Tu A11 01
Presentation Date: 2018
 

Abstract

The Wisting discovery in the south-west Barents Sea is a laboratory for geophysical studies due to its shallow reservoir and complex geological history. This discovery is constantly highlighting aspects of conventional seismic processing that require new approaches and technologies to allow AVO to be preserved and understood. Previous studies at the Wisting discovery have highlighted the importance of imaging in the depth domain with an accurate earth model for AVO preservation, including accounting for absorption within the imaging itself. In addition, AVO studies over the discovery have highlighted shortcomings with conventionally acquired and processed seismic datasets; The lack of near angles has made AVO studies over the discovery challenging and the AVO extracted from the seismic has not matched the modelled AVO at well locations. Following on from the recommendations of the previous AVO studies, OMV and partners initiated a reprocessing project that would focus on combining all previous experience with the Wisting seismic data. This paper describes the FWI model building and time reprocessing performed, and how we tailored the processing and QC to optimize the AVO response in the shallow section.

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