| 渤海湾盆地辽东湾坳陷古近系沙一段、沙二段重力流沉积及其油气勘探意义* |
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| 引用本文： | 刘磊,陈洪德,钟怡江,徐长贵,魏鹏,黄馨瑶,彭思雨.渤海湾盆地辽东湾坳陷古近系沙一段、沙二段重力流沉积及其油气勘探意义*[J].古地理学报,2017,19(5):807-818. |
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| 作者姓名： | 刘磊 陈洪德 钟怡江 徐长贵 魏鹏 黄馨瑶 彭思雨 |
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| 作者单位： | 1.成都理工大学沉积地质研究院,四川成都 610059;2.油气藏地质及开发工程国家重点实验室,成都理工大学,四川成都 610059;3.中海石油(中国)有限公司天津分公司,天津 300452 |
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| 基金项目： | Co-funded by the Project of China Geological Survey(No.1212011220762)and the Project of Tianjin Branch of CNOOC China Ltd.(No. CCL2013TJXSBS1880) |
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| 摘 要： | 针对辽东湾坳陷断拗早期阶段,即沙河街组二段、沙河街组一段沉积时期,岩心中识别出的大量重力流沉积,利用岩心的沉积特征、测录井数据及重力流沉积理论,将该时期重力流沉积划分为浊流沉积、砂质碎屑流沉积、滑动与滑塌沉积三大类。该时期重力流沉积主要发育于三角洲前缘,触发机制为古地震和重力双重作用,主要控制因素为物源供给。结合不同重力流砂体的叠置关系、连井剖面、分布位置及前人研究成果,建立了该时期三角洲前缘重力流发育模式,并将其分为: 滑塌根部、斜坡中间和盆地平原3个相带。通过对各类重力流砂体储集层物性的分析可知,分布于斜坡中间部位的砂质碎屑流沉积及近源浊流沉积具有良好的储集条件。综合分析认为: 沙二段沉积时期三角洲前缘的重力流砂体规模及厚度较沙一段沉积时期更大,同时具备良好的生、储、盖、运条件,对油气勘探具有重要的意义。
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| 关 键 词： | 沙河街组 重力流 发育模式 砂质碎屑流 浊流 辽东湾坳陷 渤海湾盆地 |
| 收稿时间： | 07 March 2017 |
Gravity-flow deposits in the Members 1 and 2 of Paleogene Shahejie Formation and their significance for oil-gas exploration in Liaodong Bay Depression,Bohai Bay Basin |
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| Liu Lei,Chen Hongde,Zhong Yijiang,Xu Changgui,Wei Peng,Huang Xinyao,Peng Siyu.Gravity-flow deposits in the Members 1 and 2 of Paleogene Shahejie Formation and their significance for oil-gas exploration in Liaodong Bay Depression,Bohai Bay Basin[J].Journal of Palaeogeography,2017,19(5):807-818. |
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| Authors: | Liu Lei Chen Hongde Zhong Yijiang Xu Changgui Wei Peng Huang Xinyao Peng Siyu |
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| Institution: | 1.Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059 Sichuan;3.Tianjin Branch of CNOOC,Tianjin 300452 |
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| Abstract: | Various gravity-flow deposits have been identified, using cores of the Liaodong Bay Depression in the early stage of faulted-depression phase, which consists of the Members 1 and 2 of Shahejie Formation. Gravity-flow deposits as documented in this study can be divided into turbidities,sandy debrites and slumps and slides based on sedimentary characteristics of cores,logging information and sediment gravity flow theory. These gravity-flow deposits in this period were developed in delta fronts in the Members 1 and 2 of Shahejie Formation which were triggered by paleoearthquakes and gravity. The sediment supply represents the most important controlling factor. With reference to previous studies,and superimposion,distributing locations and connecting-well sections of different gravity-flow deposits,this study establishes the depositional model of gravity flow in delta fronts at the early stage of faulted-depression phase,which can be divided into three facies belts: Slump-root belt,middle-slope belt,and basin plain belt. Based on the analysis of reservoir properties of different gravity-flow deposits,sandy debrites flow and near-source turbidities distributed in middle zone of slope,represtent favorable reservoir for hydrocarbon exploration. The scale of gravity-flow sandbodies in delta front of the Member 2 of Shahejie Formatiom is shown to be larger than that of Member 1. These sandbodies have a good condition of source,reservoir,cap and migration of hydrocarbon accumulation,which has the significance for oil and gas exploration. |
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| Keywords: | Shahejie Formation gravity flow development model sandy debris flow turbidity current Liaodong Bay Depression Bohai Bay Basin |
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