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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The Mahogany Subsalt Discovery;
A Unique Hydrocarbon Play, Offshore Louisiana
By
1Phillips Petroleum
2Anadarko Petroleum
3Amoco Production Research, Tulsa, Oklahoma
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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