--> ABSTRACT: The Mahogany Subsalt Discovery: A Unique Hydrocarbon Play, Offshore Louisiana, by Holly Harrison, Dwight "Clint" Moore, Peggy Hodgkins; #91020 (1995).
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The Mahogany Subsalt Discovery: A Unique Hydrocarbon Play, Offshore Louisiana

Holly Harrison, Dwight "Previous HitClintTop" Moore, Peggy Hodgkins

Phillips Petroleum Company, in partnership with Anadarko Petroleum Corporation and Amoco Production Company, announced a significant discovery at the Mahogany subsalt prospect, located on Ship Shoal Blocks 349 and 359. Offshore Gulf of Mexico. The Mahogany #1 (OCS-G-12008) was drilled in 375^prime of water to a depth of 16,500^prime and tested both oil and gas below an allochthonous salt sheet. The well flowed 7,256 BOPD and 9.9 MMCFD on a 32/64^Prime choke at 7,063 PSI FTP. The #2 delineation well (OCS-G-12008) was drilled from the same surface location to a depth of 19,101^prime MD (18,572^prime TVD). A different zone in this well was tested in July, 1994 and flowed 4366 BO and 5.315 MMCFD on a 20/64^Prime choke at 6,287 PSI FTP. These flow rates suggest that high susta nable production rates can be expected and they are confirmed by rock property studies and detailed well log analysis. A third well (OCS-G-12010 #2) was spud in September, 1994.

Limited geological and geophysical interpretations of the structural/stratigraphic framework at Mahogany will be previewed along with the overall impact of the discovery for subsalt exploration in the Gulf of Mexico. Depositional environments and reservoir parameters in productive sandstone intervals have been defined using whole core and well log imaging. Structural and rheological aspects of the thick salt sill will be addressed using selected examples of rotary sidewall cores and data on an anomalous "gumbo" shale immediately below the salt which contributes to the understanding of lateral variations at the base of the allochthonous salt.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995