【摘要】 对于海相沉积盆地而言 ,在一个三级海平面变化周期内形成的层序 ,具有全球可对比性的等时地层单元 ,跨时约 0 .3～ 3Ma。在三维高分辨率地震、岩心和测井解释资料基础之上 ,通过岩石地层旋回特征、可容空间以及层序地层关键界面识别 ,将珠江口盆地渐新世晚期的珠海组二段分为S1和S2 两个三级层序。由于坳陷处于浅海陆棚环境 ,每个层序中的低水位体系域不发育 ,局部以受断层控制的水下峡谷充填为特征。更多还原

【Abstract】 The depositional sequences spanning about 0.3-3 Ma formed within the third-order cycles of eustatic changes in a marine basin are thought to be comparable on a global scale. The Zhujiang River mouth basin studied here is a marginal extensional basin in which a succession of vertically cyclic siliciclastic sediments laid down. The second member of the late Oligocene Zhuhai Formation may be further divided, on the basis of the three-dimensional high-resolution seismic section, drilling core and well logs data in integration with the recognition of stratigraphic cycles, accommodation spaces and key boundaries, into two third-order sequences: S 1 and S 2. These sequences are commonly lack in the lowstand systems tract and locally filled with fault-confined submarine canyon sediments.更多还原