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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Ship Shoal 113 and South Pelto 20 Fields:
Detection of Subtle Traps Utilizing 3-D Technology
and Detailed Development Geologic Practices
By
Murphy Exploration and Production Company, New Orleans, LA
Ship Shoal Block
113 Field and
South Pelto
Block
20 Field are located
about 100 miles southwest of New Orleans,
Louisiana in 30' to 50' of water. To
date, over 374 wells have yielded 144
million BO and 446 BCFG from Lower
Pleistocene through Upper Miocene
sands (2,000' to 15,000'). Production is
primarily from complexly-faulted structural
traps (domal and interdomal) associated
with episodic salt movement
throughout Late Miocene to Pleistocene
time.
Detection of these fields was based on gravity data. Development of the field evolved to include the integration of all well information into fair to good quality 2-D seismic data and ultimately into state-of-the-art 3-D seismic survey which was acquired in April, 1988 (Ship Shoal) and January, 1991 (South Pelto).
Through December, 1991, 26 wells had been drilled in Ship Shoal 113 and South Pelto 20 Fields based on the 3-43 interpretation with a 92% success rate. All wells were amplitude supported and were primarily structural traps. With amplitude supported prospects waning, a comprehensive effort was undertaken, utilizing an interactive 3-D workstation to detect subtle non-amplitude related structural traps along the flanks of these salt domes.
In November, 1991, the Ship Shoal
Block
113 "N-2" well was successfully
drilled and completed in a subtle salt
overhang play, with no amplitude support. The well encountered 85' net oil in
two Upper Pliocene sands prior to penetrating
salt. Subsequently, five salt
flank locations were drilled in these
fields (four were successful). Additional domal tests will be drilled in the upcoming year.
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