Phillips Petroleum Company, in partnership with Anadarko Petroleum Corporation and Amoco Production Company, have 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' of water to a depth of 16,500' and tested both oil and gas below an allochthonous salt sheet. The well flowed 7,256 BO and 9,900 MCFGPD on a 32/64" choke at 7,063# FTP. The #2 delineation well (OCS-G- 12008) was drilled from the same surface location to a depth of 19,101" MD (18,572' TVD). A different zone in this well was tested during July 1994 and flowed 4,366 BO and 5,315 MCFGPD on a 20/64" choke at 6,287# FTP. These flow rates suggest that high sustainable 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 spudded during September, 1994.

Limited geological and geophysical interpretations of the structural and 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 well log imaging. Unique log responses in some sands will be examined using new pay confirmation techniques. 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 directly below the salt, which contributes to the understanding of lateral variations at the base of the allochthonous salt.

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