塔里木盆地石炭系层序地层划分及演化

Sequence stratigraphic division and evolution of Carboniferous in Tarim Basin

运用层序地层研究的理论及方法,针对塔里木盆地石炭系东河砂岩开展层序地层研究,探讨在塔里木盆地利用露头—钻井—地震资料为基础的综合层序地层解释方法技术,识别层序边界,建立地层格架。通过野外露头观察、钻井资料分析及地震剖面综合解释方法技术,在石炭系识别出了6个层序。重点对觉马—赛克区东河砂岩段层序进行分析,认为该段是一个穿时岩性地层单元,跨3个层序,即C-SQ1,C-SQ2,C-SQ3,其主体相当各层序的低位—海进域(TST),为一套海岸上超砂岩沉积,是今后的重点勘探目标。

Sequence stratigraphic studies have been carried out in the Carboniferous Donghe sandstones in the Tarim Basin based on the theories and methodologies of sequence stratigraphy.An integrated technique for sequence stratigraphic interpretation has been discussed by means of outcrop,drilling and seismic data.The technique can be used to identify sequence boundaries and establish stratigraphic frameworks.Through field outcrop observation,drilling data analyses and seismic profile interpretation,we have identified 6 sequences in the Carboniferous.The Donghe sandstone sequence in Juema-Saike region is a diachronous lithostratigraphic unit including 3 sequences： C-SQ1,C-SQ2 and C-SQ3.The main part of the sequence is equivalent to TST.The sandstones consist of coastal onlap deposits and are the key targets for future explorations.