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羌塘盆地鄂纵错地区上三叠统储层流体包裹体研究
断块油气田
2018年 25卷 第01期
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Title
Fluid inclusion analysis for Ezongcuo Area of Upper Triassic Formation in Qiangtang Basin
单位
中国地质调查局成都地质调查中心，四川 成都 610081
国土资源部沉积盆地与油气资源重点实验室，四川 成都 610081
西藏区域地质调查大队，西藏 拉萨 851400
Organization
Chengdu Center, China Geological Survey, Chengdu 610081, China
Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land and Resources, Chengdu 610081, China
Regional Geological Survey of Tibet, Lhasa 851400, China
摘要
对鄂纵错地区羌资6井上三叠统储集层样品进行包裹体镜下显微观察、荧光分析和均一温度、盐度测量，结合埋藏史研究，结果表明：研究区发生过4期油气充注，第1期成藏时间为中侏罗世中期（168.1~162.5 Ma）；第2期成藏时间为中侏罗世中期到晚侏罗世晚期（162.5~145.3 Ma）；第3期成藏时间为晚侏罗世晚期到早白垩世早期（145.3~139.6 Ma）；第4期成藏时间为中新世中期（16.3~9.6 Ma）。第1期为少量低成熟度油充注，第2和第3期为较高成熟度油气充注，第4期为凝析油和天然气充注，其中，第2和第3期是该区上三叠统地层最主要的成藏期。
Abstract
In this research, fluid inclusion samples from QZ-6 of the Upper Triassic Formation in the Ezongcuo Area of Qiangtang Basin have been analyzed to measure the fluorescent indicator, the occurrence, homogenization temperature and salinity. The result indicates that there are four times of thermal fluid flow. By burial historical curves, the four large scale processes of hydrocarbon generation, migration and accumulation happened sequentially in the Middle Middle Jurassic period(168.1￣162.5 Ma), the Middle Middle Jurassic period to the Late Late Jurassic period(162.5￣145.3 Ma), the Late Late Jurassic period to Early Early Cretaceous period(145.3￣139.6 Ma) and the Middle Miocene(16.3￣9.6 Ma). The first period is a little low maturity oil filling, the second and the third are high maturity oil and gas injection, and the fourth period is condensate oil and gas injection. The second and the third periods are the most important accumulation periods of the Upper Triassic in this area.
关键词：
上三叠统;
流体包裹体;
油气成藏;
鄂纵错地区;
羌塘盆地
;
Keywords:
Upper Triassic;
fluid inclusion;
hydrocarbon accumulation;
Ezongcuo Area;
Qiangtang Basin
;
DOI
10.6056/dkyqt201801011
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