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*

doi:10.7605/gdlxb.2016.02.011

摘要/Abstract

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。

关键词: 沉积格局, 时空演化, 沉积充填型式, 砂层组, 戴南组, 古近系, 深凹带, 高邮凹陷

Abstract: With the comprehensive methods of drilling,well logging,seismic interpretation,test and analysis and other data,the main types of sedimentary facies of the Member 1 of Paleogene Dainan Formation in the deep sag of Gaoyou sag were identified,and the sedimentary patterns and spatiotemporal evolution of the sand group hierarchy were summarized. The results show that the sedimentary facies of the Member 1 of Dainan Formation includes delta,fan delta,nearshore subaqueous fan and sublacustrine fan;what??s more,there are beachbars and isolated sandbodies formed by events in shallow and semi-deep lake. In the Member 1 of Dainan Formation depositional period,deltas developed in the northern slope zone of the deep sag,which were dominated by delta front subfacies;a series of small fan deltas developed in the southern step-fault zone;nearshore subaqueous fans developed in parts of Xiaoliuzhuang and Zhouzhuang areas;beach bars and isolated sandbodies formed by events occurred in the shallow and semi-deep lake in Lianmengzhuang area;sublacustrine fans developed in the center of each sub-sag.The tectonic activities of Zhen②-1 fault,Zhen②-2 fault,Hanliu fault and the comb-shape fault troughs formed by Wu① fault,and the transformation of water environment from(weak)oxidizing to reducing jointly control the sedimentary pattern of the Member 1 of Dainan Formation. The depositional filling of the Member 1 of Dainan Formation can be divided into three stages:Retrogradation in the third sub-member,aggradation in the second sub-member,and retrogradation with subsequant aggradation and retrogradation in the first sub-member.The water depth and sedimentary filling processes of Shaobo sub-sag,Fanchuan sub-sag and Liuwushe sub-sag vary regularly from early to late and are slightly different in the three areas.

中图分类号:

P512.2

袁静,董道涛,宋璠,梁绘媛,梁兵,李鹤永,马英俊,. 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*[J]. 古地理学报, 2016, 18(2): 147-160.

Yuan Jing　Dong Daotao　Song Fan　Liang Huiyuan Liang Bing　Li Heyong　Ma Yingjun. Sedimentary patterns and spatiotemporal evolution of the Member 1of Paleogene Dainan Formation in deep sag of Gaoyou sag,Subei Basin[J]. JOPC, 2016, 18(2): 147-160.

http://www.gdlxb.cn/CN/Y2016/V18/I2/147

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