层序地层学在东海陆架盆地的应用现状

Applications of Sequence Stratigraphic Analysis in the East China Sea Shelf Basin

本文从研究方法的角度，总结了近年来对东海陆架盆地层序地层研究的部分成果。（１）确定和完善了瓯江凹陷和西湖凹陷的层序格架。（２）分析了这两个凹陷中主要油气目的层段的体系域发育情况，即在瓯江凹陷中分析了盆地发育初期（Ｔ６°￣Ｔ５°）两个层序的体系域发育情况，以及Ｔ５°￣Ｔ３°中海相层序的体系域发育情况；在西湖凹陷中分析了海陆过渡相层序（Ｔ３＾４￣Ｔ３°）和陆相层序（Ｔ３°￣Ｔ２＾４）的体系域发育情况。

Some positive results of sequence stratigraphic analysis in the East China Sea Shelf Basin are elaborated in this paper. (1)Confirm and perfect sequence boundaries of Qujiang and Xihu Troughs. (2)Analyse the systems tracts of some sequences that may have oil/gas, that is, the systems trades of sequences (T6°-T5°)at the beginning of basin and marine sedimentary sequences (T5°-T3°)in Oujiang Trough ; the systems tracts of transitional sedimentary sequences (T3~4-T3°,)and Alluvial and lacustrine sediments sequences (T3°-T2~4)in Xihu Trough. Summarized the relationship between systems tracts with oil/gas that had already been found in Xihu Trough. Recommend the possible position of non-structural trap, offer important data for petroleu.m prospecting.