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Geochemical characterization of gases from the Mississippian Barnett Shale, Fort Worth Basin, Texas

Norelis D. Rodriguez and R. Paul Philp
Geochemical characterization of gases from the Mississippian Barnett Shale, Fort Worth Basin, Texas
AAPG Bulletin (November 2010) 94 (11): 1641-1656

Abstract

Molecular and isotopic compositions of 51 gas and 7 condensate samples produced from the Barnett Shale were determined by gas chromatography-isotope ratio mass spectrometry to investigate their origin and maturity at the time of generation. Additionally, two hydrous pyrolysis experiments were performed to calibrate maturity values predicted for gas generation. Molecular and carbon and hydrogen isotopic compositions of the gases indicate that gas produced from the Barnett is thermogenic. To estimate generation maturity, additional analyses were performed on the condensates and available core samples. Diamondoid indices combined with vitrinite reflectance (R (sub o) ) measurements, isotopic and molecular composition, and hydrous pyrolysis experiments suggest that gas produced from the Barnett Shale was generated within the condensate-wet gas window (1.3-2.0% R (sub o) ) at a later stage than hydrocarbons accumulated in shallower reservoirs. The origin of the gas is thermogenic, probably derived from both kerogen cracking and secondary cracking of previously generated nonmigrated hydrocarbons. Additionally, the occurrence of a methane isotope reversal in group 1 gases corroborates that in-situ oil or gas cracking is occurring in the easternmost part of the study area.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 94
Serial Issue: 11
Title: Geochemical characterization of gases from the Mississippian Barnett Shale, Fort Worth Basin, Texas
Affiliation: Chevron Energy Technology Company, Houston, TX, United States
Pages: 1641-1656
Published: 201011
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 28
Accession Number: 2010-091029
Categories: Economic geology, geology of energy sourcesIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. chart, 7 tables, sketch maps
N33°00'00" - N33°27'00", W97°54'00" - W97°24'00"
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N32°34'60" - N33°00'00", W98°04'60" - W97°40'00"
N32°30'00" - N33°00'00", W97°37'00" - W97°04'60"
N32°08'60" - N32°34'60", W97°37'00" - W97°05'60"
Secondary Affiliation: University of Oklahoma, 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
Update Code: 201049
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