天然气勘探与开发2023，Vol.46Issue(4)：80-90,11.DOI:10.12055/gaskk.issn.1673-3177.2023.04.008
川中高磨地区中二叠统栖霞组天然气成藏条件及过程
Geological conditions and process of gas accumulation in Middle Permian Qixia Formation,Gaoshiti-Moxi area,central Sichuan Basin
白晓亮 1陈燕萍 2彭思桥 1王尉 1李堃宇 1王伟 2苏桂萍1
作者信息
- 1. 中国石油西南油气田公司勘探开发研究院
- 2. 油气藏地质及开发工程国家重点实验室·成都理工大学
- 折叠
摘要
Abstract
The exploration for the Middle Permian Qixia Formation,an important successor to the Cambrian producing formations,has made great breakthroughs in recent years in the Gaoshiti-Moxi area of central Sichuan Basin.Based on core thin-section observation,natural gas geochemical analysis,and fluid inclusion thermometric analysis,the geological conditions for hydrocarbon accumulation in the Formation were discussed.Meanwhile,coupling with the restoration of regional burial-thermal evolution history,the main factors controlling the hy-drocarbon accumulation were identified,and the reservoir evolution process was revealed.The results indicate that the Qixia Formation has good geological conditions for hydrocarbon accumulation.(i)the Qixia Formation dolomite reservoirs contain pores,vugs and fractures,with multi-stage superimposed thin layers vertically.(ii)Natural gas is mainly supplied by the high-quality source rocks of the Lower Cam-brian,partially by some source rocks of the Middle Permian,and by certain source rocks of the Silurian Longmaxi Formation(mainly in the southern part of the study area).(iii)The E-W strike-slip faults serve as favorable pathways for the vertical migration of natural gas,commu-nicating the source rocks and reservoir rocks to favor the gas accumulation.(iv)The gas reservoirs of the Qixia Formation are currently lith-ologic reservoirs under the tectonic setting.These reservoirs have undergone an evolution process from the Indosinian oil paleo-reservoir to the Yanshan gas paleo-reservoir and then to the present gas reservoir.In this process,the study area did not suffer remarkable adjustment and transformation,and reflects in-situ enrichment and efficient accumulation of gas.关键词
川中高磨地区/油气成藏条件/成藏过程/中二叠世/栖霞组/油气充注期次Key words
Gaoshiti-Moxi area of central Sichuan Basin/Hydrocarbon accumulation condition/Accumulation process/Middle Perm-ian/Qixia Formation/Hydrocarbon charging phase引用本文复制引用
白晓亮,陈燕萍,彭思桥,王尉,李堃宇,王伟,苏桂萍..川中高磨地区中二叠统栖霞组天然气成藏条件及过程[J].天然气勘探与开发,2023,46(4):80-90,11.
