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GEOREF RECORD

Oil and gas geochemistry and petroleum systems of the Fort Worth Basin

Ronald J. Hill, Daniel M. Jarvie, John Zumberge, Mitchell Henry and Richard M. Pollastro
Oil and gas geochemistry and petroleum systems of the Fort Worth Basin (in Special issue; Barnett Shale, Ronald J. Hill and Daniel M. Jarvie)
AAPG Bulletin (April 2007) 91 (4): 445-473

Abstract

Detailed biomarker and light hydrocarbon geochemistry confirm that the marine Mississippian Barnett Shale is the primary source rock for petroleum in the Fort Worth Basin, north-central Texas, although contributions from other sources are possible. Biomarker data indicate that the main oil-generating Barnett Shale facies is marine and was deposited under dysoxic, strong upwelling, normal salinity conditions. The analysis of two outcrop samples and cuttings from seven wells indicates variability in the Barnett Shale organic facies and a possibility of other oil subfamilies being present. Light hydrocarbon analyses reveal significant terrigenous-sourced condensate input to some reservoirs, resulting in terrigenous and mixed marine-terrigenous light hydrocarbon signatures for many oils. The light hydrocarbon data suggest a secondary, condensate-generating source facies containing terrigenous or mixed terrigenous-marine organic matter. This indication of a secondary source rock that is not revealed by biomarker analysis emphasizes the importance of integrating biomarker and light hydrocarbon data to define petroleum source rocks. Gases in the Fort Worth Basin are thermogenic in origin and appear to be cogenerated with oil from the Barnett Shale, although some gas may also originate by oil cracking. Isotope data indicate minor contribution of biogenic gas. Except for reservoirs in the Pennsylvanian Bend Group, which contain gases spanning the complete range of observed maturities, the gases appear to be stratigraphically segregated, younger reservoirs contain less mature gas, and older reservoirs contain more mature gas. We cannot rule out the possibility that other source units within the Fort Worth Basin, such as the Smithwick Shale, are locally important petroleum sources.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 91
Serial Issue: 4
Title: Oil and gas geochemistry and petroleum systems of the Fort Worth Basin
Title: Special issue; Barnett Shale
Author(s): Hill, Ronald J.Jarvie, Daniel M.Zumberge, JohnHenry, MitchellPollastro, Richard M.
Author(s): Hill, Ronald J.
Author(s): Jarvie, Daniel M.
Affiliation: U. S. Geological Survey, Denver, CO, United States
Affiliation: U. S. Geological Survey, Denver, CO, United States
Pages: 445-473
Published: 200704
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 64
Accession Number: 2007-056651
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, 2 tables, sketch map
Secondary Affiliation: Humble Instruments and Services, USA, United StatesHumble Instruments and Services, USA, United StatesGeoMark Research, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 200730
Program Name: USGSOPNon-USGS publications with USGS authors
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