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  被引量:1

Fluid inclusion and hydrocarbon-charging episodes in the Permian Maokou Formation,southern Sichuan Basin

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作  者:李跃杰 谢静平[2] 袁海锋[1] 高兆龙 汪晓星[3] 阳聪 Li Yuejie;Xie Jingping;Yuan Haifeng;Gao Zhaolong;Wang Xiaoxing;Yang Cong(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;Exploration Division,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China)

机构地区:[1]油气藏地质及开发工程国家重点实验室·成都理工大学,四川省成都市610059 [2]中国石油西南油气田公司勘探开发研究院 [3]中国石油西南油气田公司勘探事业部

出  处:《天然气勘探与开发》2023年第4期69-79,共11页Natural Gas Exploration and Development

基  金: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)。

摘  要:蜀南(四川盆地南部地区)是历经半个多世纪勘探与开发的老工业气区,该区中二叠统茅口组具有储层类型多、气藏小而多且分布复杂等特征。本次研究基于流体包裹体均一温度与盐度测试分析方法、激光拉曼的分析技术,结合岩石岩相特征,明确蜀南地区茅口组包裹体发育与分布特征,以及油气充注期次,确定油气成藏时间。研究结果表明:①蜀南地区茅口组存在4期油气充注,分别发生在古油藏、古油气藏、古气藏的形成时期,以及晚期构造运动导致的气藏调整阶段;②第Ⅰ期油气充注时包裹体均一温度集中分布在95~113℃,为液态烃充注,充注时间为上三叠统须家河组沉积末期,是古油藏形成时期;③第Ⅱ期油气充注时包裹体均一温度集中分布在121~135℃,为液态烃与少量气态烃充注,充注时间为早侏罗世时期,是古油气藏形成时期;④第Ⅲ期油气充注时包裹体均一温度分布集中分布在160~195℃,为气态烃与少量液态烃充注,充注时间为中晚侏罗世—晚白垩世时期,为古气藏的形成时期;⑤第Ⅳ期油气充注时包裹体均一温度集中分布在135~160℃,充注时间为新近纪至今,气烃充注主要为喜马拉雅期构造抬升导致古气藏发生调整,为现今气藏的形成阶段,其包裹体均一温度低于第Ⅲ期油气充注时的温度。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 formi

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 

分 类 号:P618.13[天文地球—矿床学]

 

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