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GEOREF RECORD

Seismic definition of detachment and basement-involved structures beneath Absaroka Range, western Big Horn Basin, Wyoming

Marvin D. Brittenham and Bruce H. Tadewald
Seismic definition of detachment and basement-involved structures beneath Absaroka Range, western Big Horn Basin, Wyoming (in AAPG Rocky Mountain Section meeting, Anonymous)
AAPG Bulletin (May 1985) 69 (5): 844

Abstract

The subsurface structure of the western margin of the Big Horn basin is obscured by the Absaroka Volcanic Supergroup (Eocene). This volcanic-volcaniclastic sequence, in many places more than 5,000 ft (1,500 m) thick, is dissected into an extremely rugged terrain. This steep terrain and presence of surface volcanic rocks had in the past discouraged petroleum exploration. Recent seismic data, as represented by two lines, have extended the known western limits of the basin far under the volcanic-volcaniclastic rocks of the Absaroka Range. The Cody platform, an uplifted and eastward-tilted platform containing surface anticlines and associated oil fields such as Oregon Basin, Grass Creek, Little Buffalo Basin, and Hamilton Dome, extends under the eastern third of the range where other similar anticlines have been defined. As shown by an east-west seismic line traversing the North Fork Shoshone River, the northern area of the platform is dominated by structures radiating from the giant Sunlight volcanic center. This line shows that prospective sedimentary rocks and potential structural traps exist as far west as Yellowstone National Park. New evidence relating to detachment faulting in Mesozoic rocks is illustrated by a north-south portable seismic line through the South Fork Shoshone River valley and Carter Mountain. This line demonstrates that thrust faults exposed on either side of the valley are not traces of the same fault or a window in the "South Fork thrust fault." The new term "Carter Mountain fault" is proposed for the southern fault trace and "South Fork fault" is retained for the northern fault trace. The seismic data presented show excellent quality in spite of difficult portable operations and complex velocity problems. The area shows promise for future discovery of giant oil fields characteristic of the Big Horn basin.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 69
Serial Issue: 5
Title: Seismic definition of detachment and basement-involved structures beneath Absaroka Range, western Big Horn Basin, Wyoming
Title: AAPG Rocky Mountain Section meeting
Author(s): Brittenham, Marvin D.Tadewald, Bruce H.
Author(s): Anonymous
Affiliation: Snyder Oil Co., Denver, CO, United States
Pages: 844
Published: 198505
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: AAPG Rocky Mountain Section meeting
Meeting location: Denver, CO, USA, United States
Meeting date: 19850602June 2-5, 1985
Summary: Y
Accession Number: 1986-035328
Categories: Economic geology, geology of energy sources
Document Type: Serial Conference document
Bibliographic Level: Analytic
N43°30'00" - N45°00'00", W110°15'00" - W109°00'00"
N43°47'60" - N45°00'00", W111°02'60" - W108°34'60"
Secondary Affiliation: Consultant, Eagle, CO, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1986
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