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Abstract
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Stress
Regimes in the Gulf Coast, Offshore Louisiana: Data from Well-Bore Breakout
Analysis1 N. A. Yassir and A. Zerwer3 |
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ABSTRACT
Maximum horizontal stress (SHmax)
orientations were mapped for the northern Gulf of Mexico, offshore Louisiana,
using borehole breakouts, which are commonly used by petroleum and drilling
engineers to determine the stress regime for well-bore stability analyses
and reservoir stimulation. The breakout signal is subtle, but indicates
SHmax orientations largely parallel to the strike of the progradational
clastic sedimentary wedge, in a general northeast-southwest direction.
However, significant anomalies exist in the breakout orientations, the
main anomaly being orthogonal to the principal SHmax direction.
These anomalies were attributed to local perturbations around faults and
salt structures and to the effect of the underlying salt. The correspondence
among the orientation of faults, salt intrusions, and SHmax
from breakouts with the strike of the clastic wedge confirms the existence
of stress anisotropy in the northern Gulf of Mexico shelf sediments. Stress
anisotropy is caused by the geometry and orientation of the prograding
wedge and its associated gravity-driven extension.
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