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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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