海底峡谷的侵蚀—沉积作用将诱发含烃流体渗漏，并导致水合物矿藏经历破坏-改造-再稳定的动态过程，二者的相关性是一个较为普遍的现象。珠江口盆地海底峡谷群的发育区域是我国首个海域水合物钻探区，然而峡谷群形成演化影响下的水合物分布及动态成藏过程还有待深入研究。基于岩心-测井-地震资料，采用地质-地球物理-数值模拟综合研究的方法，以峡谷群的形态和沉积建造为切入点，刻画峡谷群与有利沉积体分布和水合物产出的配置关系，分析峡谷群对水合物矿藏的破坏；解剖峡谷群与含烃流体渗漏之间的耦合关联和响应机制。将不同尺度下数值模拟结果与水合物钻探结果进行对比，通过查明稳定带底界的迁移，讨论含水合物层厚度和水合物饱和度的变化，揭示峡谷群侵蚀—沉积作用控制下的水合物动态成藏过程，深化该区水合物的成藏机理。研究成果对于南海北部陆坡相似背景下的水合物勘探具有借鉴和指导意义，同时也将为南海北部水合物资源的远景评价提供科学依据。

Erosion and sedimentation of submarine canyons could cause the leakage of hydrocarbon-baring fluids, and furthermore make the hydrates suffering dynamic adjustment from the destruction to reformation to re-stabilization. The relationships between submarine canyons and marine hydrates have been documented around the world. The submarine canyons system (SCS) in the Pearl River Mouth Basin as the first area for marine hydrate exploration in China was drilled in 2007. However, the distribution and dynamic accumulation of hydrates affected by submarine canyons in the Pearl River Mouth Basin are still unclear. Resorted to geological-geophysical analysis and numerical simulation on the basis of core samples, logging and seismic data, though describing the morphological features and internal architectures of the SCS, this study will reveal the erosion and sedimentation of the SCS. By coupling the distribution of the SCS, favorable depositional system and hydrates, the destruction exerted by the SCS on the hydrates and the resulting leakage of hydrocarbon-bearing fluids would be discussed. Through simulating hydrates accumulation and comparing with the drilling results, this study will find out the key parameters including migrations of the base of hydrate stability zones and the variations of the thickness of hydrate-bearing layer and hydrates saturation. Eventually, the dynamic accumulation of hydrates dominated by the erosion and sedimentation of the SCS would be built up, helping deepen the understanding of the accumulation mechanism of hydrates in the study area. The results will not only enrich the researches on accumulation of marine hydrates developed in the canyons context, but also provide definite references for the prospective evaluation of hydrate in the northern continental slope of the South China Sea.