Geochemistry of Eagle Ford group source rocks and oils from the first shot field area, Texas

By:  and 
Edited by: Ursula Hammes

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Abstract

Total organic carbon, Rock-Eval pyrolysis, and vitrinite reflectance analyses performed on Eagle Ford Group core and cuttings samples from the First Shot field area, Texas demonstrate these samples have sufficient quantity, quality, and maturity of organic matter to have generated oil. Furthermore, gas chromatography and biomarker analyses performed on Eagle Ford Group oils and source rock extracts as well as weight percent sulfur analyses on the oils indicate the source rock facies for most of the oils are fairly similar. Specifically, these source rock facies vary in lithology from shales to marls, contain elevated levels of sulfur, and were deposited in a marine environment under anoxic conditions. It is these First Shot Eagle Ford source facies that have generated the oils in the First Shot Field. However, in contrast to the generally similar source rock facies and organic matter, maturity varies from early oil window to late oil window in the study area, and these maturity variations have a pronounced effect on both the source rock and oil characteristics. Finally, most of the oils appear to have been generated locally and have not experienced long distance migration. 

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Geochemistry of Eagle Ford group source rocks and oils from the first shot field area, Texas
Year Published 2010
Language English
Publisher Gulf Coast Association of Geological Societies
Contributing office(s) Central Energy Resources Science Center
Description 17 p.
Larger Work Type Conference Paper
Larger Work Title Gulf Coast Association of Geological Societies Transactions
First page 217
Last page 234
Conference Title Gulf Coast Association of Geological Societies 60th Annual Convention
Conference Location San Antonio, Texas
Conference Date October 10-12 2010
Country United States
State Texas
Online Only (Y/N) N
Additional Online Files (Y/N) N