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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
ABSTRACT: Using Basin Scale Understanding to Guide Infill Development in a Mature Gas Field, Wamsutter Field, Wyoming
Laura A. Banfield, William A. Hill, Robert Lieber, Tony McClain, Noel McInnis,
Lee McRae, Robert Marksteiner, Kristian Meisling, Rick Tobin, and Jon Vaitl
BP America, 501 Westlake Park Blvd., Houston, Texas 77005
ABSTRACT
Wamsutter Field is a supergiant tight gas accumulation located in the eastern
Green
River Basin of Wyoming. Over the past two years, a regional characterization
project
has focused on developing a broader understanding of the basin as a way to
improve
future field development. The hypothesis was that, by understanding the structural,
stratigraphic, and petroleum systems framework within the basin, by improving
the
quality of the well
log database, through normalization, and by integrating
consistent
and up-to-date production data, insights would be gained into controls on reservoir
productivity
that could be used to optimize the future infill drilling program.
Project results indicate that structure is a more significant controlling
factor on this
dominantly stratigraphic trap than previously realized. Height on structure
at the time
of migration and also within the modern structural configuration is an important
control
on production. The current petroleum systems model has charge occurring significantly
earlier than previously thought and into rocks that were much better reservoir
quality
than the modern day range of 0.001-0.1 millidarcies. Finally, establishment
of a
chronostratigraphic framework has supported development of productivity relationships
with three main sand body types
: shoreface, estuarine deltaic and tidal, and
fluvial,
allowing characterization of the sand-body
types
relative to higher versus
lower
productivity and storage capacity.
Improved understanding of reservoir productivity has enabled division of the
field
into segments characterized by common geologic attributes with similar risk
profiles.
This field-wide understanding of risk has created the opportunity to consider
various
development strategies, with respect to infill drilling spacing, well
pad size,
and infill
drilling pace, to match more optimally the risk profiles in the different segments.