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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Geology of the
Basin
-
Centered
Gas
Accumulation,
Piceance Basin, Colorado
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By
Williams Production Company
Denver, Colorado
Avery large basin
-
centered
gas
accumulation
in the Williams Fork Formation
of the Mesa Verde Group is currently being
actively developed at 10-acre density.
Ten-acre density is necessary to develop a
reasonable amount of the
gas
-in-place
owing to the very low (microdarcy)
permeability and the highly lenticular
nature of the fluvial sandstone reservoirs.
Within the area of commercial
gas
production,
gas
is produced from a continuously
gas
-saturated interval of 1,500–2,400 feet.
A transition zone of mixed
gas
- and
water-saturated sandstones overlies the
continuously
gas
-saturated interval. Pressure gradients, which
can be as high as 0.8 psi/ft in the lower part of the Williams Fork
in the structurally deeper part of the basin, decrease upward to
hydrostatic gradients near the top of the continuously
gas
-saturated
interval. Pervasive natural fracturing provides sufficient
reservoir permeability to allow commercial production over a
14-township area. This area is continually expanding as a result
of current active
exploration
for this
basin
-
centered
resource.
Overpressuring resulting from the generation of large volumes of
gas
from interbedded coals and carbonaceous
shales may have been important in
fracturing the sandstones. During
maximum burial and peak
gas
generation,
overpressuring may have been maintained
beneath a regionally extensive top seal in
the upper part of the Williams Fork
Formation.
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