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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
1Petroleum Consultant, 1511 18th Avenue East, Seattle, Washington 98112;
e-mail: [email protected]
2Kansas Geological Survey, 1930 Constant Ave., Lawrence, Kansas 66047-3726.reservoir
characterization
study.
ABSTRACT
carbonates
in erosional highs immediately beneath a
regional unconformity. Production comes from depths of around 4400 ft (1342 m) in
partially dolomitized shelf deposits. A detailed
reservoir
characterization
/simulation
study, recently performed as part of a Department of Energy
Reservoir
Class Oil Field
Demonstration Project, has led to important revision in explanations for observed patterns
of production. Cores recovered from three new data wells identify three main facies:
spicule-rich wackestone-packstone, echinoderm wackestone/packstone/grainstone, and
dolomitic mudstone-wackestone.
Reservoir
quality is highest in spicule-rich
wackestone/packstones but is subject to a very high degree of vertical heterogeneity due
to facies interbedding, silicification, and variable natural fracturing. The oil
reservoir
is underlain by an active aquifer, which helps maintain
reservoir
pressure but supports
significant water production.
Reservoir
simulation, using public-domain, PC-based
software, suggests that infill drilling is an efficient approach to enhanced recovery.
Recent drilling directed by simulation results has shown considerable success in improving
field production rates. Results from the Schaben field demonstration project are likely to
have wide application for independent oil and exploration companies in western Kansas.
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