摘要
在现代沉积学和层序地层学理论的指导下,综合利用沉积环境标志、露头剖面、岩芯、录井、测井、地震和古生物等资料,通过层序界面的识别和划分,认为鄂尔多斯盆地东南部侏罗系划分为6个三级沉积层序更为合理。根据侏罗系旋回特征和体系域的发育情况,分析了沉积旋回的边界及演化特征和层序对侏罗系生储盖配置关系的控制作用。认为主要储层位于延安组底部的第一个长期旋回LSC2中,是位于水进体系域(TST)的河道亚相砂岩,盖层则是位于水进体系域之上的河道泛滥平原沉积的泥岩,与三叠系层序中的生油岩构成下生上储式组合,与侏罗系层序中河道间泛滥平原亚相的泥质沉积形成自生自储式组合。
Guided by the principles of modern sedimentology and sequence stratigraphy and based on comprehensively analysis of depositional environment indicators,outcrop sections,lithologies,well logs,seismic and paleontological data,the Jurassic in the southeastern of Ordos Basin is divided into six third order sedimentary sequences separated by recognizable sequence boundaries.The characteristics of sedimentary cycles and evolution of systems tract,as well as the implications for source rock and reservoir development,are discussed.The main reservoirs locate the first long time cycle LSC2 of Yan＇an Formation base.They are channel subfacies sandstone of transgressive systematic range.Cap rock is mudstone of channels floodplain sedimentary above transgressive systematic range,and hydrocarbon source rock in Triassic formation constitute below-generation and above-storage,and mudstone sedimentary of interchannel floodplain subfacies in Jurassic formation form self-generation and self-storage hydrocarbon accumulation.
出处
《地层学杂志》
CSCD
北大核心
2010年第2期212-218,共7页
Journal of Stratigraphy
