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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.
Deepwater channel, as the main reservoir of deepwater oil and gas exploration, is of great significance to the exploration and development of deepwater oil and gas fields.Based on drilling and 3D seismic data, the study on the structure of Upper Miocene deepwater channel in Congo fan basin Internal filling period, structure and evolution characteristics were analyzed.From the point of view of sequence stratigraphy, the watercourses in the study area were divided into watercourses and watercourse complexes formed in multiple different levels of sequence frameworks The detailed description of the times and components of watercourses inside the cut valley shows that the bottom of the watercourses in the study area are bottom-up, slump filling, erosion watercourses, watercourses, natural dikes and abandoned watercourses 6 The sedimentary microfacies show a gradual decrease of fluid energy. The tertiary aqueduct complex is formed in a complex multi-stage erosion-filling process. It is affected by sea level changes, slope gradient and gravity flow rheology, and longitudinal evolution It can be divided into five stages of initial erosion, initial filling, accretion filling, late filling and waterway abandonment. In each stage, the filling structure and waterway plan Changes appear regularly.