Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Thermal maturity of the Barnett Shale determined from well-log analysis

Hank Zhao, Natalie B. Givens and Brad Curtis
Thermal maturity of the Barnett Shale determined from well-log analysis (in Special issue; Barnett Shale, Ronald J. Hill and Daniel M. Jarvie)
AAPG Bulletin (April 2007) 91 (4): 535-549

Abstract

Intensive development with large-scale fracturing treatments has made the Barnett Shale play (Newark East field) in the Fort Worth Basin the largest shale-gas field in the world. The Mississippian Barnett Shale is an organic-rich, self-sourced reservoir rock. Thermal maturity, thickness, and total organic carbon are the most important geological factors for commercial gas production from this shale formation. The log-derived thermal-maturity index (MI) has been developed in an effort to better understand and predict hydrocarbon phases across the basin. Maturity index was calculated using three types of open-hole logs: neutron porosity, deep resistivity, and density porosity (or bulk density). The derivation of MI is based on the hypotheses that shale gas is generated and stored locally without apparent migration from outside sources, and that the water saturation and the density of generated hydrocarbons decrease with an increase in thermal maturity. Maturity index correlates well with initial gas:oil ratios (GOR) from well production data. Based on this correlation, an empirical relationship has been demonstrated for the Fort Worth Basin. This method is useful in understanding the thermal-maturity levels of Barnett Shale source rock in the gas-generation window. Mapping MI, GOR, and gas heating value from hundreds of wells identifies the various maturity stages and areas of Barnett Shale that generate oil, condensate, wet gas, or dry gas in the Fort Worth Basin.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 91
Serial Issue: 4
Title: Thermal maturity of the Barnett Shale determined from well-log analysis
Title: Special issue; Barnett Shale
Author(s): Zhao, HankGivens, Natalie B.Curtis, Brad
Author(s): Hill, Ronald J.
Author(s): Jarvie, Daniel M.
Affiliation: 3906 Dunwich Drive, Richardson, TX, United States
Affiliation: U. S. Geological Survey, Denver, CO, United States
Pages: 535-549
Published: 200704
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 30
Accession Number: 2007-056655
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, sketch maps
N31°00'00" - N34°00'00", W99°45'00" - W96°30'00"
Secondary Affiliation: Humble Instruments and Services, USA, United StatesEnCana Oil & Gas (USA), USA, United StatesRepublic Energy, 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
Close Modal

or Create an Account

Close Modal
Close Modal