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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Gulf of Mexico Turbidite Prospects: Outcrop and
Modern Analogs for Tahoe and Ram Powell
Fields
By
Shell Research
Reservoir
characterization and delineation
are critical in early prospect
evaluation and
field
development. Reservoirs
dominated by thin-bedded deposits
with subordinate channels are
particularly problematic because logs
and conventional 3-D seismic cannot
resolve the detailed
reservoir
architectures
and rock properties that are necessary
for accurate
reservoir
evaluation
and simulation. Reservoirs of this type
have been penetrated as both primary
and secondary objectives throughout
the Gulf of Mexico. In particular, the
Viosca Knoll Area in the eastern Gulf of
Mexico contains multiple Miocene and
Pliocene thin-bedded reservoirs.
The approach used to model these
reservoirs, where there is limited "hard
data to help resolve reservoir
internal
features and continuity, involves: 1) detailed
core and high-resolution log
evaluations to establish stacking patterns,
permeability and porosity distributions,
and net/gross; 2) analog outcrop
studies and high-resolution seismic
data over a shallowly buried channel-levee
system to establish conceptual
models of deposition, specific information
on vertical and lateral facies relationships,
and bed length distributions;
3) use of deterministic and probabilistic
techniques to construct the
reservoir
architecture and then to assign detailed
rock properties from core to individual
layers and; 4) detailed
simulations
for
well test design and production performance
predictions that preserve the geologic
and petrophysical detail. Analog
studies, depositional models, core data,
architectural models, and comparison of
predicted and actual
field
results are
presented. Tahoe
Field
and the Ram/
Powell prospect in Viosca Knoll will be
briefly described to illustrate the
method, predictions, and
reservoir
potential.
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