川东卧新双地区天然气特征及上三叠统须家河组天然气来源
发布时间：2018-10-18 18:14
【摘要】：天然气来源分析是一个重要的石油地质问题,直接关系到勘探决策。四川盆地川东地区须家河组勘探和开发相对滞后,基础地质研究的欠缺导致卧新双地区须家河组天然气的来源一直存在争议。天然气组分及碳同位素分析结果表明:卧新双地区须家河组天然气具有甲烷含量较低、重烃含量较高、干燥系数较低等特点;天然气中甲烷碳同位素值δ~(13)C_1-40‰,具有δ~(13)C_3δ~(13)C_2δ~(13)C_1的特征;须家河组天然气为干酪根初次裂解的陆相油型气和混合气;须家河组天然气目前主要处于成熟-高成熟的湿气阶段。卧新双地区须家河组暗色泥岩较为发育,有机地球化学分析结果表明:须家河组泥岩主要以Ⅱ1和Ⅱ2型干酪根为主,具有较高的有机碳含量和氯仿沥青"A"含量,总体具有较好的生烃能力,泥岩中有机质处于成熟-高成熟的湿气阶段。卧新双地区须家河组天然气成熟度与烃源岩成熟度相当,结合须家河组天然气组分特征、同位素特征及成因类型等与下伏石炭系、茅口组、龙潭组、长兴组、飞仙关组、嘉陵江组及雷口坡组天然气存在明显区别,推测该区须家河组天然气主要为自生气。
[Abstract]:Natural gas source analysis is an important petroleum geological problem, which is directly related to exploration decision. The exploration and development of Xujiahe formation in East Sichuan Basin is relatively lagging behind, and the lack of basic geological research has led to the controversy over the source of natural gas of Xujiahe formation in Huxinshuang area. The results of natural gas composition and carbon isotope analysis show that the natural gas of Xujiahe formation in Huxinshuang area has the characteristics of lower methane content, higher heavy hydrocarbon content and lower drying coefficient, and the methane carbon isotope value 未 ~ (13) C ~ (1-40 鈥，
本文编号：2279966
[Abstract]:Natural gas source analysis is an important petroleum geological problem, which is directly related to exploration decision. The exploration and development of Xujiahe formation in East Sichuan Basin is relatively lagging behind, and the lack of basic geological research has led to the controversy over the source of natural gas of Xujiahe formation in Huxinshuang area. The results of natural gas composition and carbon isotope analysis show that the natural gas of Xujiahe formation in Huxinshuang area has the characteristics of lower methane content, higher heavy hydrocarbon content and lower drying coefficient, and the methane carbon isotope value 未 ~ (13) C ~ (1-40 鈥，
本文编号：2279966
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