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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Application of Sequence Stratigraphic Approach to Integrated Field Management
Processes: East Fault Block, Hawkins Field, Wood County, Texas
By
Exxon Company, U.S.A., Houston
An integrated sequence stratigraphic/engineering
study of the Woodbine reservoir
in
the East Fault Block of the Hawkins Field
was undertaken to optimize depletion and
operating strategies and profitability of a
unique immiscible gas
drive
/gravity drainage
EOR project in a complex fluvially
dominated memoir system. Specific study
objectives were to reduce future development drilling requirements, improve success
and performance of all future well
workovers, and maximize EOR reserves
recovery through enhanced depletion and
operating strategies. The study objectives
were achieved through a two-phase iterative
and integrated work process: 1) delineation and mapping of
reservoir
geometries and continues, and 2) integration
of production
data with the sequence stratigraphic
framework of the
reservoir
.
The 500-foot-thick Woodbine reservoir
is
divisible into two fluvially dominated sequence
sets. The lower sequence set is characterized
by sand-prone, high-frequency
sequences marked by multistory, laterally
extensive lowstand channels, overlain by
thin, laterally discontinuous flood-plain
mudstones of the transgressive systems
tract. The sequences of the upper sequence
set contain thinner, laterally discontinuous
lowstand channels and are dominated by
fine-grained floodplain deposits of the
transgressive systems tract. The sequences
display an overall retrogradational stacking
arrangement marked by a progressive upward decrease in overall
reservoir
net/gross
and lateral continuity and a corresponding
increase in thickness and continuity of the
flood-plain mudstone components.
Integration of production data with the sequence
stratigraphic framework resulted in
identification of complex flow unit geometries,
and documentation of the movement
of fluid contacts through tortuous reservoir
pathways over time. Significant results
were achieved in all aspects of production
operations, including a major reduction in
development drilling requirements and a
dramatic increase in well workover success
rates and performance. EOR project profitability
has been increased by improved
reserves recovery, accelerated oil production,
and reduced operating costs.
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