【摘要】 深水水道作为深水油气勘探的主力储层,其内部结构及演化特征的研究对于深水油气田勘探和开发都具有非常重要的意义.基于钻井及3D地震资料,对刚果扇盆地上中新世深水水道的内部充填期次、结构和演化特征进行了分析.从层序地层学的角度出发,将研究区内的水道划分为多个不同级别层序格架内形成的水道单体和水道复合体,从而对切谷内部的水道期次和组成特征进行精细表述.研究表明,研究区内水道单体自下而上发育底部滞留、滑塌充填、侵蚀水道、加积水道、天然堤和废弃水道6种沉积微相类型,整体表现为流体能量逐步降低的过程;三级水道复合体形成于复杂的多期侵蚀-充填过程,受到海平面变化、坡度及重力流流变学特征的影响,纵向演化可划分为初始侵蚀、初始充填、加积充填、后期充填和水道废弃5个阶段,各阶段切谷内充填结构和水道平面展布特征呈现有规律的变化.更多还原

【Abstract】 Deep-water channels are recognized as the very important hydrocarbon reservoir types in the oil industry.The research on the filling structure and evolution of deep water channel is very important for deep-water oil & gas exploration and development.In this paper,based on the well and 3D seismic data,the epoch,structure and evolution of Upper Miocene deep water channel in Congo Fan basin is analyzed.For the purposes of describing the internal architecture clearly,we divided the channels system into different grade channel complex and individual channel,which based on their sequence stratigraphic setting.Individual channel is mainly composed by 6 microfacies.From bottom to up,there are basal lags,slumps,eroded channels,stacked channels,levee,abandoned channels,which is the process of fluid energy gradually reducing;the 3th channel complex in the research area formed in a multi-stage process of erosion and filling.It can be divided into five evolution stages,including initial erosion stage,the initial filling stage,the stacking-filling stage,the later filling stage and the abandon stage.The different stages show the different filling architecture and distribution of 3th channel complex,which is controlled by the sea-level changes,the slope gradient and the rheological properties of gravity flow.更多还原