摘要
根据沉积和生物特征可以确认东营凹陷沙一段中的特殊岩性段沉积在滩坝－泻湖体系内．按构成岩性可将滩坝分为砂质和碳酸盐两类．它们的出现反映了凹陷内沙一期相对湖水位上升速率、供屑速率、气候、沉积基底地形等综合背景条件．在演化上，碳酸盐沉积的全面终止意味着滩坝－泻湖体系的终止，终止的根本原因是相对湖水位较大幅度上升所导致的河流注屑速率下降．该沉积体系被认为是湖进体系域的主要构成部分，而且很可能没有典型凝聚层与之伴生．
In the light of sedimentology and biology, the specially lithologic section in Member 1 of the Shahejie Formation is proved to have been deposited in a barrier-lagoon system. The barrier can be lithologically divided as sandy and carbonate types, and the latter itself is also built up within the lagoon. The occurrence of the system reflects a condition integrated with relative lake-level rising rate, clasts supply rate, climate and depositional basement topography in Member 1 period. The overall cease of the carbonate precipitation is signified to the withering-away of the system, and is resulted essentially from the low-rate sediment supply by rivers to the lake as the relative lake-level rises up near the source of the rivers. The package therefore, can be regarded as the major part of the transgressive systems tract and is very likely to possess no typical condensed section accompanied with in the strata.
出处
《地球科学（中国地质大学学报）》
EI
CSCD
北大核心
1998年第1期21-26,T001,共6页
Earth Science-Journal of China University of Geosciences
基金
八五胜利油田横向协作项目
关键词
滩坝-泻湖
凝聚层
东营凹陷
沉积体系
层序发育
barrier-lagoon
relative lake-level
sediment supply rate
condensed section
Dongying Sag.
