Print this pageGeologic/Geophysical Models and Reservoir Characterization of the Gemini Subsalt Discovery, Deepwater Gulf of Mexico
OGILVIE, JEFFREY S., CLIVE G. SHARMAN, JOHN H. SHINOL, and CHERYL R. ROPP
The Gemini subsalt prospect is located 40 miles southeast of the mouth of the Mississippi Delta in approximately 3300 feet of water. Gemini is a significant Gulf of Mexico deep water natural gas and oil discovery made under joint partnership with Texaco Exploration and Production, Inc. and Chevron U.S.A. Production Company, Inc. Reservoirs sands all lie beneath a tabular salt sheet, making 3D seismic interpretation challenging. Yet, reservoir geometries can be observed from seismic data and integrated with high-resolution logs, analog studies of other similar fields, and detailed core analysis. The sands and their associated anomalies reside near the crest and flank of a large faulted structure. These reservoirs are within a deep water, sand rich, channel-levee system and may be best described as laminated turbidite deposits with significant lateral extent. Two stratigraphically different reservoirs, but with similar thin-bedded characteristics were perforated and tested. One zone tested at 22 MMCFGPD and 3778BOPD, while the other zone tested at 32MMCFGPD and 627BOPD. Exploration and appraisal drilling is underway using further iterations of 3D depth migrations and evolving depositional models.