东濮凹陷地质三分性与沙三期沉积古地理

东濮凹陷构造与沉积明显分为2个阶段：沙三段沉积时期和沙二段-东营组沉积时期。沙三段时期，东濮地区发育濮阳湖和东明湖。濮阳湖受兰聊、五星集-六塔断层活动控制，形成深水湖相-浅水盐湖相的暗色泥岩与盐岩、砂岩韵律，是现今油气最丰富的领域，盆内二级断层——杜寨断层、石家集-马寨断层、濮西断层的相继发育控制沉积中心的分布；东明湖是受兰聊断层活动控制的箕状凹陷，因补偿速度快，仅形成浅一半深水的砂泥岩韵律，生油岩发育质量差，现今的西洼南部地区是上述两湖泊的边缘，基本无生油岩发育。沙二段-东营组时期，长垣、黄河、文东、文西等断层强烈活动，形成两洼-隆一斜坡的构造格局，彻底改变了沙三期的沉积古地理，形成多个洼陷和多个沉积中心。

Geological Threefold Division and Sedimentary Palaeogeography in Es3 Period in Dongpu Depression

Tectonics and sedimentary were divided clearly two periods which were Es_3 and Es_2-Ed.In Es_3 period.Puyang lake and Dongming lake were growing in Dongpu area.The Puyang lake was controlled by Lanlao fault activity and Wuxingji-Liuta fault activity,and then dark mudstone and rhythm of salt rock and sandstone of deep lake facies and shallow salt-lake facies were formed.Dark mudstone and rhythm of salt rock and sandstone are the richest oil and gas areas now.The distribution of sedimentary centers was controlled by secondary faults~,growing,such as Duzhai fault,Shijiaji-Mazhai fault and Puxi fault in Dongpu depression.Dongming lake was a half depression which was controlled by Lanlao fault activity.The shallow-half deep water~,rhythm of mudstone and sandstone were formed because of fast compensating velocity,and the growing quality of oil source-rock was poor.There was no oil source-rock in Xiwa south area which was located above two lakes~,boundary.In Es_2-Ed period,structural pattern of two sags-one uplift-one slope was formed because of strong fault activity such as Changhong fault,Huanghe fault,Wendong fault,Wenxi fault,etc.Sedimentary palaeogeography was changed completely.Many sags and many sedimentary centers were formed.