Sedimentary patterns and spatiotemporal evolution of the Member 1of Paleogene Dainan Formation in deep sag of Gaoyou sag,Subei Basin
Yuan Jing1 ，Dong Daotao1， Song Fan1， Liang Huiyuan2， Liang Bing3， Li Heyong3， Ma Yingjun3
1 School of Geosciences, China University of Petroleum(East China),Qingdao 266580,Shandong 2 Shengli Oilfield Company,SINOPEC,Dongying 257000,Shandong 3 Jiangsu Oilfield Company,SINOPEC,Yangzhou 225012,Jiangsu
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.
. 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.
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