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Slope-break types and sequence stratigraphic styles of the Oligocene Lingshui Formation in Qiongdongnan Basin,South China Sea
Author(s): 
Pages: 473-479
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  slope-break zonesequence stratigraphyLingshui FormationOligoceneQiongdongnan BasinSouth China Sea;
Abstract: Based on the theories of sedimentology ,sequence stratigraphy and petroleum geology ,this paper identified two types of slope-break including fault slope-break and flexure slope-break on the basis of sequence framework of the Oligo-cene Lingshui Formation in Qiongdongnan Basin .We also documented the features of each slope-break and their control and influence on the sedimentary systems .Two kinds of sequence styles including single fault half graben-like type and step fault type are recognized in the Lingshui Formation .The former sequence style commonly occurs in a half graben ba-sin with one main boundary fault and can be divided into a margin steep slope zone ,a deep center zone and a margin gen-tle slope zone .While the later sequence style mainly develops in a basin under the joint control of one main boundary fault and many secondary faults parallel with the boundary fault .This paper also studied the distribution of each sequence style and its inner structure characteristics .The results indicate that the sandbodies of low system tract and high system tract are the favorable targets for future hydrocarbon exploration .
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