琼东南盆地深水重力流沉积旋回演化规律与形成机理

深水重力流沉积体系包含了块体搬运沉积体系与水道-堤岸体系，传统理论并未考虑二者之间的相互转化，存在研究不足。本申请拟引入旋回地层学的研究方法，以琼东南盆地的深水区为研究靶区，从沉积体系相互转化着手，将块体搬运沉积体系与水道-堤岸沉积体系纳入一个整体——沉积旋回进行研究。以最新采集的2D/3D 高分辨率地震、测井、综合录井数据及沉积物样品测试数据为研究资料，通过地震沉积学与旋回地层学的方法与技术，获得在海平面变化主控因素控制、物源供给充足、深水沉积环境中的重力流沉积与演化规律，阐明四级海平面变化（500-100 ka）对深水重力流沉积的控制作用，建立一个与完整四级海平面变化周期对应的深水重力流沉积旋回模型，为深水油气勘探与开发、海底不稳定性及海洋地质灾害研究提供理论基础与科学依据。

The mass transport deposits and channel leveed deposits are composed the deep-water deposits. There is a lack of overlooking the transformation between two systems in the previous research. Our proposal will aim at the transformation between two gravity flow deposit systems in the deep-water region of Qiongdongnan Basin, South China Sea. The highlights include adopting the cyclostratigraphy and building a sediment cycle from the mass transport deposits to channel-levee systems. Based on the newest 2D and 3D seismic data, deep-water drilled wells data, well logging data and sediment core, deposition and evolution of gravity flow which was formed within the adequate supply source deep-water sedimentary environment controlled by sea-level changes, will be built by the analysis of the seismic sedimentology and cyclostratigraphy. A model corresponding to completed sea-level change cycle will be established by analyzing the relationship of the different gravity flows with the relative sea-level changes of 500-100 ka scale. The result of this study will provide theoretical foundation and scientific basis for the exploration and development of deep-water oil&gas, studies on the seafloor instability and marine geological disasters.