【摘要】 东濮凹陷北部渐新统沙河街组三段和一段蒸发岩(岩盐、石膏)发育,与生油岩等共生的含盐系地层厚逾千米,通过对该凹陷及邻区的中-新生代构造沉积地层的分析,以及对盐类的沉积特征、成盐期的古地理、古气候的分析,认为本区的蒸发岩是深水沉积,分层卤水是盐湖介质存在和盐类沉积的基本形式。盐湖水以高纯氯化物卤水为主,其来源为地层深部热卤水。东濮凹陷盐类沉积时的古气候与渤海湾地区其它盆地一致。由于凹陷的快速下沉,深水的陆源碎屑的沉积岩和暗色泥页岩发育。本文探讨了蒸发岩与沉积的关系,认为深水成因蒸发岩与生油岩形成的条件一致,可形成大量的质量较好的生油岩。更多还原

【Abstract】 There are rich evaporites (salt and gypsum predominantly) in oligocene Sahejie Formation in the northern part of the Dongpu depression. The thickness of the evaparite series coexisting with source-rock is more than 1,000 meters. Investigating the Mesozoic-Cenozoic structure of Dongpu Depression and neighboring area, the characteristics of sedimentation evaporites and paleo-clinrate and so on, the authors suggest that evaporites were deposited in deep water basin, and layered solution was the basic form of the salt lake water and mechanism of salt deposit. The brine was predominantly chloride brine, which came from the deep part of earth crust. The period of evaporite formation was thought to be not a completely dry climate, but a half-dry one. The relationships between evaporites and source-rock are described. The authors conclude that the environment in the specific salt lake was good-for both evaporites and source-rock, and a large amount source-rock can be found in the evaporite series.更多还原