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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Regional Geology
of Deep Water Salt Architecture, Offshore Gulf of Mexico
Chowdhury, Abu1 and Lopez-Mora,
Simon1
ABSTRACT
A pre-stack depth migration project was undertaken
to better image the deep-water salt and associated geology of the Gulf of
Mexico. A regional 100,000 kilometers of 3.2-kilometer by 3.2 kilometer grid,
2 dimensional seismic data was used. One hundred and ninety deep-water wells
were integrated with the seismic stacking velocities to create a velocity
model with which to migrate the sediments. The top salt was picked using
both the sediment velocity migration and the mapped time data. The subjacent
sections were then migrated with salt velocity in an attempt to image base
salt that was subsequently interpreted from seismic character, regional geology
and flatness of common image gathers. Integrated into the interpretation
was: the mapped base salt from time data, multiples of the water bottom and
top salt to distinguish from real events, and cross-line interpretation picks
that were posted in the depth domain.
The pre-stack, depth-migrated data reveal thick
salt canopies up to 6 kilometers associated with fold belts in Alaminos Canyon,
Keathley Canyon and southern Garden Banks. They are very massive with generally
gently dipping bases. In contrast, the salt bodies of eastern Walker ridge
and southeastern Green Canyon show steep dips. The salt further east in the
Atwater Fold Belt generally dips gently. The salt body architecture commonly
varies from back ramp rooted to deflated autochthons or allochthons. Northward,
in relatively shallow water, salt generally varies in thickness from 0.5
to 3 kilometers. Many show association with shallow decollement surfaces
that can be traced updip into the shelf areas.
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