--> Abstract: Jolliet Field Revisited: Producibility of Upper Slope Turbidites in Green Canyon 184, by D. Brannon, A. Chedburn, W. J. Schneider, and M. Sheedlo; #90987 (1993).

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BRANNON, DAN, ANDREW CHEDBURN, * WILLIAM J. SCHNEIDER, and MARK SHEEDLO, CONOCO, Inc., Lafayette, LA

ABSTRACT: Jolliet Field Revisited: Producibility of Upper Slope Turbidites in Green Canyon 184

Jolliet field (Green Canyon 184) reservoirs are mid- to upper-Pleistocene intraslope turbidites complicated by rapid depositon, sea level fluctuations, salt movement, and structural complexities. Seven exploratory wells integrated with 3-d seismic coverage allowed for geological and geophysical description of the reservoirs. Engineering characterization of the reservoirs prior to development was based on well log analysis, sidewall and whole core data, and DSTs. Subsequent drilling of 20 development

wells provided additional data and improved the geological description of the reservoirs.

Production began from the field in November 1989. High initial rates with rapid declines were characteristic of the reservoirs, especially in the subthrust and faulted east flank. this behavior is attributed to reservoir compartmentalization and the lack of aquifer support. Completions in the less faulted western flank have been much better performers. Produced oils have been variable in API gravity, with a range of 20 to 60 degree gravity, and some oils are paraffinic.

Notable technical successes included the predrilling of 20 development wells under time and under budget, the installation of the first tension leg well platform in the Gulf of Mexico, a water depth record for a production platform (1760 feet), gravel packs of fine grained zones, and the use of selective completions. Significant concerns include the poor performance of some reservoirs and the production of paraffin. Operational changes for future projects might include longer gravel packed DST's from more zones, the capability to use early production to guide development (if economically possible), and early involvement of facilities personnel.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.