The Palaeocene, Everest Complex, in the UK North Sea Central Graben, contains stratigraphically trapped gas condensate. Shear velocity logs were acquired in several wells. Rock property measurements on core from the Forties and overlying shale allowed anisotropy to be estimated. Comparisons were made between synthetic CMP gathers in a deviated well using measured logs, logs corrected for anisotropy and computed shear logs. AVO anomalies were seen at top and base of gas on both synthetic and real CMP gathers. These AVO responses can be enhanced by offset range stacking. Interpretation of seismic data, specially processed for AVO and calibrated through modelling, has allowed optimal siting of wells and has been a valuable tool in the field development.

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