| 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。 |
| 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 |
| DOI： |
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| 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 |
| DONG Yong-zhi, TIAN Jing-chun, ZHANG Shi-ping, TAN Xian-feng, MENG Wan-bin |
(1. No.2 Hydrogeological and Engineering Geological Party, Henan Bureau of Geology and Mineral Resources, Zhengzhou 450000, Henan, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China) |
| Abstract: |
| 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. |
| Key words: half-graben depression ramp sequence stratigraphic framework diagenesis diagenetic stage diagenetic facies |
