Isotopic reversal ('rollover') in shale gases produced from the Mississippian Barnett and Fayetteville formations

被引：254
|
作者：
Zumberge, John [1 ]
Ferworn, Kevin [1 ]
Brown, Stephen [1 ]
机构：
[1] GeoMark Res LLC, Houston, TX 77095 USA
来源：
MARINE AND PETROLEUM GEOLOGY | 2012年 / 31卷 / 01期
关键词：
Shale gas; Carbon isotopic reversal; Ouachita thrust; FORT-WORTH BASIN; HYDROCARBON GASES; RATIOS; SYSTEM;
D O I：
10.1016/j.marpetgeo.2011.06.009
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Ethane, propane, and carbon dioxide show reversed carbon isotopic maturity trends in natural gas produced from the Barnett and Fayetteville Shales at thermal maturities greater than similar to 1.5% VRE. At this high level of thermal maturity, the iso-butane to n-butane ratio also reverses, suggesting wet gas cracking has occurred, generating more gas molecules in the same volume resulting in overpressure, and increased stabilized production rates in the Barnett. Hydrothermal fluids from the nearby Ouachita Thrust front apparently enhanced the maturity of the Fayetteville and Barnett shales. Water-hydrocarbon reactions at these high maturities may account for the isotopic reversals. (C) 2011 Elsevier Ltd. All rights reserved.
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页码：43 / 52
页数：10
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