关键词: 珠三坳陷, 沉降速率, 沉降中心, 构造演化, 沉积充填

Abstract: The back-stripping analysis of Tertiary subsidence history in Zhusan depression shows that its subsidence feature is closely related to the structural evolution and depression sedimentation of Pearl River Mouth basin. In the early Oligocene, the subsidence of Zhusan depression was mainly controlled by tectonic movement with big value of subsidence rate and rift filled by the lake, being in stage of fault and source rock development. In the late Oligocene, the depression entered into stage of fault and depression, controlled by tectonic movement and subsidence after rift, slowing the subsidence rate, shaping regional reservoir body with multi-set sand-shale sediments. By the end of Oligocene, the subsidence rate was increased, forming better regional muddy cap rocks in this area.

Key words: Zhusan basin, subsidence rate, subsidence center, structural evolution, sedimentation, filling