川西坳陷侏罗系沉积环境

The sedimentary environment of Jurassic depression in the west of Sichuan

川西坳陷侏罗系天然气富集主要受岩相控制。经侏罗系岩性、岩石组合、沉积韵律和古生物分布等综合分析 ,认为该区早侏罗世—中侏罗世早期沉积环境以常年湖、沼泽和泛滥平原为主 ,中侏罗世晚期以泛滥平原、时令湖为主 ,间夹间歇湖 ,晚侏罗世早期以时令湖为主 ,晚侏罗世晚期则以泛滥平原、洪积扇和间歇湖、时令湖为主。

The natural gas enrichment of Jurassic depression in the west of Sichuan is mainly controlled by lithofacies. The sedimentary environment of early period in early Juraepochmiddle Juraepoch in this area is mainly considered as permanent lake, marsh and flood plain, the sedimentary environment of later period in middle Juraepoch is mainly considered as flood plain and season lake with intermittent lake, early period in later Juraepoch as season lake, and later period in later period in later Juraepoch as flood plain, diluvial segment, intermittent lake and season lake. This achievement has certain guidable effect for natural gas exploration of Jurassic in the west of Sichuan.