Geochemical characteristics and origin of natural gases from terrestrial strata in Yuanba area of the Northeastern Sichuan Basin(川东北元坝地区陆相气地球化学特征及来源)
川东北元坝地区近年来在上三叠统须家河组(T3x)及中下侏罗统千佛崖组(J2q)和自流井组(J1z)陆相地层发现工业性气藏.它们的化学成分和碳同位素组成存在明显差别，具有不同的成因和来源.须家河组天然气烷烃中以甲烷为主，干燥系数在0. 96以上.其上、下部地层天然气碳同位素组成变化显著，T3x3~5气层乙烷碳同位素较重，δ13C2值（-25.2‰~-20.7‰）均大于-26‰，为典型的高-过成熟煤型气；而T3x1~2天然气δ13C2值大多数小于-28‰，主要在-32‰~-28‰，具有高-过成熟煤型气与过成熟油型气混合气的特点.J1z地层天然气干燥系数大都在0. 95以上，δ13C2值在-28....
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Zhejiang University Press
2014-07-01
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| Series: | Zhejiang Daxue xuebao. Lixue ban |
| Subjects: | |
| Online Access: | https://doi.org/10.3785/j.issn.1008-9497.2014.04.020 |