珠江口盆地陆架坡折带海底滑坡及其影响因素

为了解海底滑坡在陆架坡折演化过程中所起的作用并分析影响海底滑坡发育的因素,以最新采集的二维和三维地震资料为基础,综合运用了地貌分析和地震解释技术,通过对滑坡的地貌形态特征及地震响应特征进行详细刻画,在珠江口盆地陆架坡折带新近纪地层中识别出多处海底滑坡,明确了其分布范围并建立了滑坡发育的地质模式。分析认为,珠江口盆地相对海平面变化和流体活动的综合作用是导致研究区海底不稳定的主要因素。海底滑坡发源于海底峡谷的朔源侵蚀,向上陆坡扩展并终止于陆架坡折带。

Submarine slides and influencing factors in the continental shelf break area of the Pearl River Mouth Basin

As oil and gas exploration have gradually advanced to the deep ocean, submarine slides have drawn increasing concern in the study of deep-water deposition processes. To understand the role of slope failures in shelf-break evolution, in this study, we combined geomorphological analysis and seismic interpretation based on newly acquired 2D/3D seismic data. Based on our results, we identified multiple Neogene submarine slides occurring in the continental shelf break area of the Pearl River Mouth Basin and delineated their distributions. This newly understood geological mode indicates that the combined action of relative sea-level change and fluid flow may trigger these slope failures, which were initiated and retrograded upwards from submarine canyon headward erosion, and terminated in the continental shelf break area.