Study on Sequence Stratigraphy of Deep Water Sediments in Youjiang Basin
TIAN Jing chun CHEN Hong de PENG Jun QIN Jian xiong HOU Zhong jian (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059)
Nowadays the research of sequence stratigraphy has become a hot spot problem in geology. But, it is very difficult to use the sequence stratigraphy theory to divide the sequence of deep water basin sedimentary layer, this is because that the lithologic\|character of deep water basin sedimentary layer is very monotonous. In study area, from Devonian Period to Triassic Period the strata of the deep water basin sediments are very well developed which included turbidite and siliceous\|mudstone sediment. So the paper discussed in detail the sequence characteristics of deep water basin sedimentary layer. The results showed that the sequence boundary surface characteristic of turbidite sediments was obvious,which displayd that the surface was irregular and the bottom of LST sandstones developed many different erosion surface, etc, and the sequence evolution of turbidite was related to the turbidite fan′s evolution. The sequence division of siliceous\|mudstone sediment can be identified through the analyses of content proportion and origin of mudstone.