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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Jolliet Field Development, Structure,
and Stratigraphy - A Deep Water Milestone,
Green Canyon, Gulf of Mexico,
Offshore Louisiana
By
The Jolliet Field is believed to be the first development
in the offshore U.S. Gulf of Mexico to exploit a major
reverse fault
trap. With the world's first tension leg well
platform (TLWP) set in 1760 ft. (536 m.) of water on the
upper continental slope, the field has also set a water depth
record for a production platform.
The field's multiple stacked reservoirs consist of unconsolidated
Pleistocene lowstand fan grain flow, debris flow,
and turbidite deposits. Regionally, the area is structurally
dominated by four major salt diapirs. The field is structurally
complicated by an underlying salt ridge, a major syndepositional
reverse fault
, and late normal faults.
Reverse fault
documentation includes 3-D seismic
interpretation, repeated paleontological markers, prediction
and correlation of up to 3000 ft. (914 m.) of repeated pay
section, as well as slope stability computer modeling. One
well repeated 18 of 23 known reservoir sands in the subthrust. However, syndepositional movement along the
fault
created an expanded subthrust section relative to the
paleohigh of the overthrust section.
A structural model is presented suggesting that the
reverse fault
developed at the toe of a major salt flank
growth
fault
. The
fault
was initiated during the Lower
Pleistocene as the sediment slope was diapirically oversteepened.
The resultant failure surface was cylindrically
constrained by salt at its lateral limits and by higher density
Pliocene shale at depth. This model is supported by slope
stability computer modeling using realistic sediment
strengths, densities, and pore pressure gradients.
Unnumbered Figure. GC 184 Jolliet Field Structure Section.
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