A Comprehensive Anisotropic Velocity Model Building Case Study - Tengiz Full Azimuth Land TTI PSDM

Tengiz field is an oil and gas field located in northwestern Kazakhstan, next to the Caspian sea. The carbonate reservoir lies below a complex overburden consisting of Kungurian salt with a wide-varying scale of anhydrites. The seismic image at the reservoir level suffers from noise and multiple contamination caused by poor illumination and velocity errors. In this paper we present a TTI PSDM model building workflow tailored to address these problems. Aided by a recently acquired high-fold full-azimuth seismic survey and the latest imaging technology, we are able to address many of these challenges and produce an improved image for future development of the field.