箕状断陷湖盆缓坡带层序地层格架内成岩特征研究——以东营凹陷南部缓坡带沙河街组为例  

Diagenesis within the sequence stratigraphic framework in the ramp zone of the half-graben fault lake basin:An example from the Shahejie Formation in the southern ramp zone of the Dongying depression,Shandong

作　　者：董永志[1] 田景春[2] 张世平[1] 谭先锋[2] 孟万斌[2] 

机构地区：[1]河南省地矿局第二水文地质工程地质队,河南郑州450000 [2]成都理工大学油气藏地质与开发工程国家重点实验室,四川成都610059

出　　处：《沉积与特提斯地质》2008年第3期46-51,共6页Sedimentary Geology and Tethyan Geology

摘　　要：东营凹陷在沙河街组沉积期为北陡南缓的箕状断陷湖盆。通过钻井岩心、测井、薄片及扫描电镜分析,在断陷湖盆的南缓坡带古近系沙河街组中识别出了冲积扇、河流、三角洲和湖泊沉积体系,以及滨浅湖砂坝和缓坡远端浊积扇沉积相。建立了东营凹陷南部缓坡带层序地层格架及层序演化模式。在此基础上,详细研究了层序地层格架内的成岩作用特征。层序地层格架内主要成岩作用类型有压实作用、压溶作用、溶解作用等,成岩阶段为早成岩A、B期,晚成岩A、B期。层序地层格架内发育了碳酸盐胶结、石英次生加大、高岭石胶结和泥岩压实四种成岩相。The Dongying depression was once a half-graben fault lake basin being steep in the north and gentle in the south during the deposition of the Shahejie Formation. The studies of cores, well logs, thin sections and SEM result in the recognition of the alluvial fan, river, delta, littoral and shallow lacustrine sandbar, distal turbidite fan and lacustrine depositional systems in the Palaeogene Shahejie Formation in the southern ramp zone of the Dongying depression, and construction of the sequence stratigraphic framework and its evolutionary model for the southern ramp zone of the Dongying depression. The emphasis is laid on the diagenesis within the sequence stratigraphic framework, including compaction, pressure solution and dissolution. The diagenetic stages contain Stages A and B of the early diagenesis, and Stages A and B of the late diagenesis. The diagenetic facies consist of carbonate cementation,quartz secondary enlargement, kaolinite cementation and mudstone compaction diagenetic facies.

关 键 词：箕状断陷 缓坡 层序地层格架 成岩作用 成岩阶段 成岩相 

分 类 号：TE121.3[石油与天然气工程—油气勘探]