珠江口盆地西部珠江组潮流砂脊的分布、形态和水动力机制

综合地震、钻井及测井资料，运用层序地层学理论，研究认为珠江口盆地西部珠江组一段上部泥质粉砂岩低阻油层砂体为潮流砂脊砂体，对潮流砂脊的形态与平面展布特征进行了研究，探讨了潮流砂脊的水动力特点与形成机制，并在珠江组一段上部识别出四期水道，分析了潮流水道的分布及井震特征。指出水道内潮流砂脊构造-岩性圈闭和水道侧向遮挡构造-岩性圈闭两种有利的潮流砂脊隐蔽圈闭。

Distribution,geometry and hydrodynamic mechanism of tidal sand ridges in the Zhujiang Formation,the western Zhujiangkou Basin

An integration of seism ic，drilling and logging datawith sequence stratigraphic theories reveals that the oil-bearing argillaceous siltstones of low-resistivity at the upper part of the firstmember of the Zhujiang Formation in western Zhujiangkou Basin are tidal sand ridges.This paper studies their geometry and planar distribution，and discusses their hydrodynam ic features and form ingmechanism.Four stages ofwater channels are identified in the upper part of the firstmember of the Zhujiang Formation，and their distribution aswell as logging and seism ic characteristics are also analyzed.It is suggested that there are two kinds of potential subtle traps:intrachannel tidal sand ridge structural-stratigraphic traps and channel lateral-sealing structural-stratigraphic traps.