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Carbon Isotope Reversals of Changning‐Weiyuan Region Shale Gas, Sichuan Basin
Author(s) -
CAO Chunhui,
TANG Qingyan,
ZHANG Mingjie,
LV Zonggang
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12306_8
Subject(s) - shale gas , oil shale , geochemistry , earth science , geology , carbon fibers , structural basin , isotopes of carbon , sichuan basin , paleontology , total organic carbon , chemistry , materials science , environmental chemistry , composite number , composite material
Many high yield shale gas areas in the World are discovered carbon isotope reversals: Barnett, Fayetteville (Zumberge et al., 2012), Marcellus (Tilley et al., 2013), Haynesville (Ferworn et al., 2008), Albany shale gas (Gao et al., 2014), Utica shale gas (Xia et al., 1999; Xia et al., 2012; Xia et al., 2013), the Foothills (Tilley et al., 2011), Horn River (Tilley et al., 2013) and Ordos basin shale gas (Wang et al., 2015; Dai et al., 2005). The occurrence probability of carbon isotope reversals in shale gas is far higher than that of conventional gas plays. And, this isotopic abnormal phenomenon has become a typical characteristic of shale gas. Many data show that carbon isotope reversals can be used to indicate the overpressure in shale gas reservoir and shale gas higher yield (Zumberge et al., 2012; Gao et al., 2014; Tilley et al., 2013; Hao et al., 2013). However, isotope reversal occurred both at high and low production area in Marcellus (Madren, 2012). So, there are still different opinions about carbon isotope reversals indicating high yield of shale gas.