Genesis 4D Project — Design and Execution Overview
Bernard Regel1, Tom Hudson1, John Bretches2, Phil Inderwiesen3, Pat Condon4, James Rickett4, and Frank Descant5
1ChevronTexaco North America Upstream Exploration and Production Company, 935 Gravier St., New Orleans, Louisiana 70112
2ChevronTexaco Energy Technology Company, 1500 Louisiana, Houston, Texas 77002
3ChevronTexaco Energy Technology Company, 4800 Fournace Place, Bellaire, Texas 77401-2324
4ChevronTexaco Energy Technology Company, 6001 Bollinger Canyon Rd., San Ramon, California 94583-2324
5ChevronTexaco Overseas Petroleum, Avenda Lenine #77, Caixa Postal 2950, Luanda, Angola
The Genesis Field, located in deep-water Gulf of Mexico, 150 miles southwest of New Orleans, is a combination of stacked structural and stratigraphic traps on the east flank of a faulted, salt cored ridge. The field consists of over-pressured, under-consolidated, Pliocene to Pleistocene aged turbidite reservoirs, at sub-sea depths between 11,000 to 15,000 feet. Most of the reservoirs contain under-saturated, moderate GOR (1000:1 to 2000:1) oils. Since first production in 1999, over 100 MMBOE have been produced.
The rock properties and seismic response of the reservoirs make Genesis an excellent field for the application of time-lapse 4D seismic as a tool to exploit reservoir changes over time. The 4D survey goals were to provide a better understanding of reservoir changes with time and optimize the management of the field. Improved management of the field was to be accomplished through identification of by-passed reserves, better selection and positioning of sidetrack targets, and more accurate reserve estimates. Targeted reserves would be lower risk and have lower cost per barrel as a result of the 4D survey.
The history of ChevronTexaco's first 4D survey in the deep-water Gulf of Mexico will be presented chronologically from technical and economic feasibility studies, through survey design, acquisition, and processing. Designing and completing a time-lapse seismic survey for maximum repeatability with real-world constraints was a difficult challenge and the lessons learned are presented.
This project is a technical and economic success made possible by the multi-functional intra- and inter-company personnel working together as a team. Communication was excellent throughout the entire project. The goal to deliver a high quality product in a safe and timely manner was accomplished.
AAPG Search and Discovery Article #90080©2005 GCAGS 55th Annual Convention, New Orleans, Louisiana