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- Title
一川西北地区ST3 井泥盆系油气地球化学特征及来源.
- Authors
魏国齐; 董才源; 谢增业; 李剑; 国建英; 张璐; 杨春龙; 戴鑫
- Abstract
Based on analysis of geochemical characteristics of the Devonian asphalt and natural gas in well ST3, characteristics of the oil and gas of the Devonian were compared with relative source rocks. Combined with geological evidence, the source of the Devonian oil and gas in well ST3 were identified. The following are the results: Saturated hydrocarbon distribution of Devonian asphalt in well ST3 has double peaks and the Pr/Ph ratio is 0.56. C23 is the main peak of the tricyclic terpane distribution, and C30 hopanoid is the main peak of the pentacyclic triterpane. The Ts/Tm content is 0.82. The C31 ~ C35 hopane series is complete and the distribution declines. Gammacerane is high in abundance. Pregnane is rich in abundance. C27 regular sterane takes advantage in regular sterane content. The Devonian natural gas of well ST3 is dry gas, mainly composed of hydrocarbons. The content of methane is 94.42% and 96.96%, while the content of C2H6 and C3H8 is small. The drying coefficient is high. The non-hydrocarbon gas content is very low, in which the H2 S content is only 0.01 ~ 0.022 g/cm3. The average carbon isotope of CH4 and C2H6 is -31.9% and -28.5% respectively. The hydrogen isotope of methane is -139% and -138%. The comparisons show that the Devonian oil and gas in well ST3 were mainly derived from the mudstone of the Qiongzhusi Formation, while the Lower Permian marble is an important supplement.
- Subjects
GAS wells; OIL wells; HYDROGEN isotopes; ALKANES; CARBON isotopes; ANALYTICAL geochemistry; DEUTERIUM
- Publication
Journal of China University of Petroleum, 2019, Vol 43, Issue 4, p31
- ISSN
1673-5005
- Publication type
Article
- DOI
10.3969/j.issn.1673-5005.2019.04.004