川西前陆盆地侏罗系层序地层

川西前陆盆地休罗系为陆相碎屑岩地层。其中可以识别的层序界面有不整合面、最大湖泛面。最大进积面即为不整合面，而最大退积面则对应于最大湖泛面。根据川西前陆盆地的构造、沉积作用特点，选择进积体系域底界为层序界面，将川西前陆盆地侏罗系划分为8个沉积层序，可以在全盆地进行时比。

JURASSIC SEQUENCE STRATUGRAPHY IN WESTERN SICHUAN FORELAND BASIN,CHINA

The Jurassic in the West Sichuan Foreland Basin is continental detrital sedimentary strata, within which the recognizable sequence boundaries include uncomformity and erosional deposi-lion break, and lake-flooding surface. In order to overcome the limitation of these tow sequence boundaries in the continental strata studies, the authors introduce the concepts of the largest progradational surface and the largest lake-flooding surface. Thelargest progradational surface is just the largest erosional surface or even the unconformity, and the largest retrograding surface is just coupled by the largest lake-flooding surface. Taking the system tracts as the basic consisted units within the sedimentary sequences，in the light of progradational system tracks and retro-grading system tracks，the authors divide the Jurassic of West Sichuan Foreland Basin into 8 sequences, which can be correlaled within the whole basin. Since the progradational system tracks represent the products during the period from weak to strong structural activity, and also because the development of delta sediments is one of the important criteria of the progradational system tracks, so the sequence subdivision scheme is ofsignificance to guide petroleum exploration.