High resolution sequence stratigraphy of the second member of Xujiahe Formation in Tongnan area, central Sichuan Basin
Online published: 2013-02-20
Guided by the sedimentology and high resolution sequence stratigraphy theory, in combination with the data of outcrop profile, drilling core and well logging, this paper studied the high resolution sequence stratigraphy of the second member of Xujiahe Formation in the central Sichuan Basin. On the basis of recognition of different levels sequence interfaces and the types of lake flooding surface, Xujiahe Formation can be divided into two middle-term base level cyclical sequences （MSC） and four short-term base level cyclical sequences （SSC）. Among the short-term base level cyclical sequences （SSC）, we identified two cyclical structures, which are asymmetry form deepening upwards （A form） and symmetric form deepening upwards then getting shallow again（C form）. Making the short-term base level cycle as the time unit, the ancient geographical characteristics and evolution of the second member of Xujiahe Formation were discussed in detail, and the influence of lateral migration of drainage line on the sedimentary facies was analyzed.
CHEN Keyang , YANG Wei , WU Qingling , FAN Xingcai , LI Lailin , LIU Zhenkuan . High resolution sequence stratigraphy of the second member of Xujiahe Formation in Tongnan area, central Sichuan Basin[J]. Lithologic Reservoirs, 2013 , 25(1) : 45 -50 . DOI: 10.3969/j.issn.1673-8926.2013.01.010
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