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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: From 2 Dimensional to 3 Dimensional: Modeling
the Western Gulf of Mexico Using Recently Acquired Long Offset Seismic
and Gravity Data
Parsons, M.1, Price, A.1, Bain, J.1,
Mulcahy, S.1, and Pawlowski, R.1
ABSTRACT
The subsurface of the western Gulf of Mexico
is a complex geological environment that has been evoking recent strong interest
from the petroleum industry. In an effort to image deeper structures, and
to better understand the geological setting, long offset seismic and marine
gravity data have recently been acquired throughout this area for the period
mid 2003 to present.
In the seismic processing of the initially acquired
lines, 2 dimensional gravity data was used to improve seismic modeling and
imaging of salt. This proved to be valuable in the Pre-Stack Depth Migration
phase of processing, so that when a network of seismic and gravity lines
had been acquired a 3 dimensional earth model was created for the area of
interest. Thus such a model was used in assessing 3 dimensional shapes - particularly
salt.
The complex nature of this area encompasses
sutured salt canopies, hidden salt roots and evacuated/welded basins. The
ability to model these features using gravity, in both a forward modeling
and inversion mode, prior to the Pre-Stack Depth Migration process saves
valuable time and money in the seismic processing sequence.
Insight is also gained into deeper features
such as basement structure and crustal composition. Throughout the 3 dimensional
modeling and the 2 dimensional seismic interpretation phases, geophysicists
working on the project had access to both gravity and seismic data. Integration
and interaction throughout the process was crucial in obtaining a better
understanding of the Western Gulf.
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