Reprocessed 2D seismic data has been re-interpreted post drilling of the Waimanu-1 well within PEP 38773, operated by Greymouth Gas Taranaki Limited. The reprocessed data has resulted in new time structure maps for several key horizons in the vicinity of the Terrace-1 and Waimanu-1 wells. These resulting time structure maps are consistent with well results. The Eocene reservoir units are encountered deeper in Waimanu-1 than in Terrace-1. The Terrace-Waimanu structure shows only minimal closure to the southwest on the new time structure maps. But this may, in part, be due to velocity effects that create a relative pull-up effect toward the south or southeast. Revision of regional velocity models may result in improved confidence in structural interpretations.