Cenozoic Tectonic Phases and Their Representing Shapes in Songnan Sag, Qiongdongnan Basin
Received date: 2009-06-10
Revised date: 2009-08-19
Online published: 2010-04-10
The Songnan sag, as the most active tectonic sag in Cenozoic in Qiongdongnan basin，is a typical sample of deepwater exploration of large-and middle-oil and gas fields. In this paper, based on detailed interpretation of trunk seismic profiles and description of structural-sedimentary shapes，four structural phases in Songnan sag were divided, i.e. whole sag rifting phase within Eocene to early stage of early Oligocene, partial rifting phase during late stage of early Oligocene to late Oligocene, integral subsidence phase in late stage of late Oligocene to Miocene, Neotectonic phase during middle Miocene to Quaternary. We also discussed the basic feature of each phases and origin of important structural\|sedimentary appearance. Since the second tectonic phase, the basement faults had ceased with except of F2 fault (corresponding to early Yacheng era to late Oligecene), and new fault system toward sag was formed. And the regional subsidence had started since T61 sedimentary interface or 1st member of Lingshui Fm，or even more earlier，but stopped after T60 sedimentary interface. It is not structurally quiet during middle Miocene to Quaternary, suggesting that the new tectonic activity would dominate the evolution of sag at last phase. These tectonic phases to oil and gas exploration were also discussed.
Key words： Qiongdongnan basin; Songnan sag; Tectonic phases; Neotectonic activity.
YU Jun-Feng, SUN Zhi-Peng, ZHU Ji-Tian . Cenozoic Tectonic Phases and Their Representing Shapes in Songnan Sag, Qiongdongnan Basin[J]. Natural Gas Geoscience, 2010 , 21(2) : 281 -288 . DOI: 10.11764/j.issn.1672-1926.2010.02.281
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