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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Application of
3-D
Seismic on Morrow Channel
Sandstones, Second Wind and Jace Fields,
Cheyenne and Kiowa Counties, Colorado
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By
Union Pacific Resources, Fort Worth, Texas
Two 3-D
seismic surveys have been
shot by Union Pacific Resources (UPRC)
to extend fields producing from Pennsylvanian
Morrow channel sands. The
target fields were Jace and Second Wind,
both located near the Colorado-Kansas
border in a Morrow channels consisting
of fluvial valley-fill sandstone and
shales which have incised into the underlying
lower Morrow carbonates. This
shale-sand and carbonate interface provides
sufficient acoustic contrast to
make the incisions interpretable on 2-D
seismic data. The sinuous nature of the
valleys, the erratic Morrow structure
and the distribution of the 2-D data are
interpretive challenges that are significantly
reduced by the
3-D
seismic data.
The Jace and Second Wind surveys
had full-fold coverage of 5 square miles
and 2.8 square miles, respectively. The
surveys had similar acquisition parameters
resulting in 20-fold subsurface
data using 75 by 75-foot bin size. At Jace,
the 3-D
survey indicated an absence of
channel where 2-D data had shown potential
valley incision, thus saving UPRC from drilling several dry holes.
At Second Wind, the
3-D
interpretation
clearly defined the limits and geometry
of the valley and uncovered a complex
series of fault blocks cutting the valley.
The subsequent drilling encountered a
thick channel sandstone at the predicted
structural elevation.
In the Morrow Stateline trend, 3-D
seismic data has proven its ability to
provide a more accurate "picture" of the
Morrow valley geometry, therefore, reducing
the risk of near-miss non-sand
valley wells. Many of the Morrow structural
complications, particularly the
tracking of faults and their influence on
the valley system, are more clearly understood
on a
3-D
data set.
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