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The basins that produce the nation’s
natural gas are surprisingly deep. Many contain sedimentary columns that
are 30,000 feet or more in depth. However, less than 1 percent of all
wells drilled have penetrated below 15,000 feet drilling depth.
Nonetheless, in 1998, "deep" reservoirs (arbitrarily defined as
occurring more than 15,000 feet below the surface) accounted for 7
percent of domestic production. The National Petroleum Council projects
this share will grow to 12 percent by 2010.
NETL sponsors the assessment of deep gas
resources in order to help identify the technological barriers that
limit deep gas exploration. As has been proven in the low-permeability
resources program, basic information on resource volumes and nature can
lead to industry’s acceptance of the viability of frontier resources and
spur industry development, testing, and utilization of advanced
technologies.
Recently, much of the Program’s work with
the United States Geological Survey (USGS) has focused on updating the
1995 assessments of deep, basin-centered accumulations. Work is focused
on the Hanna, Anadarko, Arkoma, Cook Inlet, Holbrook, Columbia, Warrior,
Los Angeles, Alaska interior, Colville, and Gulf Coast basins, as well
as the Snake River downwarp, Willamette-Puget trough, and Salton trough.
NETL is also sponsoring USGS work to
better understand the following: 1) the potential nature of deep
undiscovered conventional plays in the Gulf of Mexico, 2) improved
methods for identifying potentially productive zones in basin-centered
accumulations, 3) review of the gas expulsion behavior of different
kerogen types and oil from deep source rocks, and 4) the deep Cotton
Valley gas trend of the Louisiana-Mississippi salt basins.
NETL supports efforts to advance an understanding of deep gas environments and
to develop new technologies that can reduce deep drilling costs and bolster
drilling efficiencies dramatically. These efforts comprise the Deep Trek Program.
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