天然气勘探与开发2023，Vol.46Issue(4)：69-79,11.DOI:10.12055/gaskk.issn.1673-3177.2023.04.007
蜀南地区二叠系茅口组流体包裹体特征与油气充注期次分析
Fluid inclusion and hydrocarbon-charging episodes in the Permian Maokou Formation,southern Sichuan Basin
摘要
Abstract
In southern Sichuan Basin,an old gas base with exploration and development for more than half a century,the Permian Maokou Formation is characterized by numerous reservoir types and multiple small gas reservoirs with complex distribution.After the measurement of both homogenization temperature and salinity in fluid inclusion together with the laser Raman analysis,the inclusion development and distribution and the hydrocarbon-charging episodes in this Middle Permian Maokou Formation were figured out to determine reservoir-forming time based on petrographic characteristics.Results show that(i)this formation has experienced four charging episodes,namely,Episode I to form ancient oil reservoirs,Episode II to generate ancient oil and gas reservoirs,Episode III to grow up ancient gas reservoirs,and Episode IV to adjust gas reservoirs resulted from late tectonism;(ii)in Episode I,the homoge-nization temperature of fluid inclusion was mainly between 95℃and 113℃,suggesting the charging of liquid hydrocarbon.And the charging time should be at the end of the deposition of Xujiahe Formation,which was the forming time of ancient oil reservoirs;(iii)in Episode II,the homogenization temperature changed from 121℃to 135℃,suggesting the charging of both liquid hydrocarbon and a little gaseous hydrocarbon.And the charging time should be in the early Jurassic,which was also the forming period of ancient oil and gas reservoirs;(iv)in Episode III,the temperature ranged from 160℃to 195℃,suggesting the charging of both gaseous hydro-carbon and a little liquid hydrocarbon.And the charging time should be in the middle-late Jurassic to late Cretaceous,which was the forming time of ancient gas reservoirs;and(v)in Episode IV,the temperature was between 135℃and 160℃,apparently lower than that in Episode II,suggesting the charging of gaseous hydrocarbon.This charging has started since Neoproterozoic.And as a result of the adjustment of ancient gas reservoirs due to Himalayan tectonic uplift,Episode IV corresponds to the forming time of present gas reservoirs.关键词
蜀南地区/茅口组/流体包裹体/油气充注期次/成藏年代Key words
Southern Sichuan Basin/Maokou Formation/Fluid inclusion/Hydrocarbon-charging episode/Reservoir-forming time引用本文复制引用
李跃杰,谢静平,袁海锋,高兆龙,汪晓星,阳聪..蜀南地区二叠系茅口组流体包裹体特征与油气充注期次分析[J].天然气勘探与开发,2023,46(4):69-79,11.基金项目
国家自然科学基金项目"川中磨溪构造寒武系龙王庙组多期流体充注的地球化学特征与油气成藏过程"资助项目(编号:41572133). （编号:41572133）
