Sedimentary features and controlling factors of the gravity flows in submarine fan of Middle Miocene in the Qiongdongnan Basin
Received date: 2015-04-08
Revised date: 2015-10-27
Online published: 2016-02-10
Previous research showed that shelf slope break zone in Qiongdongnan Basin was formed at the end of Miocene,while paleoslope was developed in the northern Basin at the earlymiddle period of the Miocene.Based on the analysis of the relationship of Miocene slope break zone,regional sea level,delta,and gravity flows,sedimentary features and controlling factors of the gravity flows were concluded with drilling and seismic data.The research showed that sedimentary,fault and flexure slope breaks were developed in the northern Basin at the earlymiddle period of the Miocene,and sedimentary break zone had an important effect on the distribution of the gravity flows.When regional sea level falling at 10.5Ma,Ledong Sag and Lingshui Sag developed largescale and sandrich submarine fans,which could be divided into two periods.Lingshui Sag developed early submarine fans,where turbidite channels moved quickly with large number and weak incision.Ledong Sag developed terminal submarine fans,where turbidite channels distributed stably with smaller amount and strong incision,and lobes bodies' morphology appeared flabellate.Turbidite channels and lobes bodies of submarine fans were the favorable sedimentary units.
Xie Yuhong,Fan Caiwei,Zhou Jiaxiong,Zhang Yingzhao,Tan Jiancai,Ren Keying . Sedimentary features and controlling factors of the gravity flows in submarine fan of Middle Miocene in the Qiongdongnan Basin[J]. Natural Gas Geoscience, 2016 , 27(2) : 220 -228 . DOI: 10.11764/j.issn.16721926.2016.02.0220
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