东濮凹陷文西断裂带沙三段层序地层与沉积体系

通过对东濮凹陷文西断裂带层序类型、体系域类型的研究表明，沙三段形成于半干旱气候条件下的深湖-半深湖陆源碎屑和盐湖沉积。主要沉积体系包括河流-三角洲体系、深湖-半深湖砂、泥沉积和盐湖沉积。湖进体系域水体加深，以半深湖-深湖和浊流沉积广泛发育为特征。高位体系域地层横向分布稳定。湖退体系域发育以进积为主的准层序组。储集砂体主要分布在湖退体系域，其中层序Ⅰ，Ⅱ和Ⅲ湖退体系域发育的水下分流水道、河口砂坝、前缘席状砂以及远砂坝为最重要的储集单元。

Depesitional system and sequence stratigraphy of the third member of Shahejie Formation in Wenxi fracture belt,Dongpu Depression

The research of types of the sequence and system tract of Wenxi fracture belt in Dongpu Depression shows that the third member of Shahejie Formation was the terrigenous lacustrine detrital deposit formed in deep and half-deep salt lake under the semiarid climate.The major deposit system is composed of fluvial-delta system,deep and half-deep lacustrine sand and mud deposit and salt lake deposit.In transgressive system tracts,the water is getting deep characterized by widespread developed half-deep or deep lacustrine and turbidite deposit.The reservoir sand is steady in the lateral in high stand systems tracts.Transgressive quasi-sequence group is developed mainly in regressive system tracts.The reservoir sand mainly distributes in the regressive systems tracts.Among these,subaqueous distributary channel,distributary mouth bar,front sand sheet and distal bar are the most important reservoir unit.