BASIN STRUCTURE FROM TWO-DIMENSIONAL SEISMIC REFLECTION DATA, CRAZY MOUNTAINS BASIN, MONTANA Page: 3 of 39
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Abstract
Some 140 miles of multichannel seismic reflection data, acquired
commercially in the 1970's, were reprocessed by the U.S. Geological Survey in
late 2000 and early 2001 to interpret the subsurface geology of the Crazy
Mountains Basin, an asymmetric Laramide foreland basin located in south-
central Montana. The seismic data indicate that the northwestern basin
margin is controlled by a thrust fault that places basement rocks over a thick
(22,000 feet) sequence of Paleozoic and Mesozoic sedimentary rocks to the
south. From the deep basin trough, Paleozoic through Tertiary rocks slope
gently upward to the south and southeast. The northern boundary of the
basin, which is not imaged well by the seismic data, appears to be folded over
a basement ridge rather than being truncated against a fault plane. Seismic
data along the basin margin to the south indicate that several fault-
controlled basement highs may have been created by thin-skinned tectonics
where a series of shallow thrust faults cut Precambrian, Paleozoic, and early
Mesozoic rocks, whereas, in contrast, Cretaceous and Tertiary strata are
folded. The data are further interpreted to indicate that this fault-bounded
asymmetric basin contains several structures that possibly could trap
hydrocarbons, provided source rocks, reservoirs, and seals are present. In
addition, faults in the deep basin trough may have created enough fracturing
to enhance porosity, thus developing "sweet spots" for hydrocarbons in basin-
centered continuous gas accumulations.iii
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Taylor, David J. BASIN STRUCTURE FROM TWO-DIMENSIONAL SEISMIC REFLECTION DATA, CRAZY MOUNTAINS BASIN, MONTANA, report, August 1, 2003; United States. (https://digital.library.unt.edu/ark:/67531/metadc787681/m1/3/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.