苏北盆地高邮凹陷深凹带古近系戴南组一段沉积格局与时空演化

发布时间：2018-03-07 15:25

本文选题：沉积格局　切入点：时空演化　出处：《古地理学报》2016年02期 　论文类型：期刊论文

【摘要】：以苏北盆地高邮凹陷深凹带古近系戴南组一段为研究对象,综合运用钻井、录井、测井、地震解释和测试分析等手段,识别其主要沉积相类型,总结其砂层组级别的沉积格局与时空演化。结果表明:研究区戴一段主要发育三角洲相、扇三角洲相、近岸水下扇相和湖相等沉积相类型,且在滨浅湖区发育滩坝和非深水事件成因砂体。戴一段沉积时期,三角洲主要分布在深凹带北部,主体为前缘亚相;南部断阶带发育一系列小型孤立扇三角洲;肖刘庄和周庄局部地区发育近岸水下扇;联盟庄地区浅湖相带多个砂层组发育滩坝和非深水事件砂体;湖底扇主要分布在一亚段各次凹中心。真2-1和真2-2断层、汉留断层以及吴1断层形成的梳状断槽等的构造活动,从(弱)氧化水环境为主、演化至各次凹中心以还原水环境为主的水体环境演变等因素,影响并控制着深凹带戴一段沉积格局。高邮凹陷深凹带戴一段沉积充填分为3个阶段:三亚段为明显的退积型式,二亚段呈加积充填型式,一亚段为退积—进积—退积充填型式;邵伯、樊川和刘五舍3个次凹水深和沉积充填过程呈现略有差异的规律性变化。
[Abstract]:Taking the first member of Dainan formation of Paleogene in the deep depression of Gaoyou depression in northern Jiangsu Basin as the research object, the main sedimentary facies types are identified by means of drilling, logging, logging, seismic interpretation and test analysis. The sedimentary pattern and spatiotemporal evolution of the sandbeds are summarized. The results show that the delta facies, fan delta facies, near-shore underwater fan facies and lake equivalent sedimentary facies are mainly developed in Dai section of the study area. The delta is mainly distributed in the northern part of the deep concave zone, the main body is the front subfacies, and a series of small isolated fan deltas are developed in the southern fault terrace. The nearshore subaqueous fan is developed in some areas of Xiaoliuzhuang and Zhouzhuang, the sandy formations of shallow lacustrine facies belt in Xianzhuang area develop beach, dam and non-deep-water event sand bodies, and the sublacustrine fan is mainly distributed in various concave centers of the first submember, true 2-1 and true 2-2 faults. The tectonic activity of the comb-like faulted troughs formed by the Hanliu fault and the Wu 1 fault evolved from the (weak) oxidizing water environment to the evolution of the water environment with the reduced water environment at the center of each depression. The sedimentary pattern of the first section of the deep concave zone in Gaoyou depression is influenced and controlled. The depositional filling of the first section of the deep concave zone in Gaoyou depression is divided into three stages: the Sanya formation is an obvious retrogradation type, and the second submember is an accretion filling type. The first submember is retrogradation, precession and retrogradation filling, and Shaobo, Fanchuan and Liuwushe have slightly different water depth and sedimentary filling process.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石化胜利油田公司;中国石化江苏油田公司;
【基金】：中国石化科技攻关项目(编号:P13125)资助~~
【分类号】：P618.13

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