古地理学报2017，Vol.19Issue(5)：807-818,12.DOI:10.7605/gdlxb.2017.05.063
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
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
摘要
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.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Key words
Shahejie Formation/gravity flow/development model/sandy debris flow/turbidity current/Liaodong Bay Depression/Bohai Bay Basin分类
天文与地球科学引用本文复制引用
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):807-818,12.基金项目
中国地质调查局项目(编号:1212011220762)及中海油天津分公司项目(编号:CCL2013TJXSBS1880)联合资助.[Co-funded by the Project of China Geological Survey(No.1212011220762) and the Project of Tianjin Branch of CNOOC China Ltd.(No.CCL2013TJXSBS1880)] （编号:1212011220762）
