白云凹陷珠江组深水扇砂质碎屑流沉积学特征

珠江口盆地白云凹陷深海水域的珠江组为油气勘探开发新领域，但珠江组厚层块状砂岩储层的成因仍存在很大争议。通过对砂岩储层的物质组分、沉积构造、粒度分布、古地形和古构造背景及地震与测井等资料的综合分析，确定白云凹陷珠江组属于深水扇沉积体系，扇体中广泛发育的厚层块状砂岩为深水扇沉积体系中内－中扇水道的砂质碎屑流沉积充填物。在详细描述砂质碎屑流沉积学特征和识别标志的基础上，确定砂质碎屑流与低位期陆架边缘三角洲前缘砂体与海平面大幅度下降期的某种触发机制作用下发生的重力滑塌和砂崩有关，具备“源-渠-汇”耦合关系的深水扇沉积模式。

Depositional Features of Sandy Debris Flow of Submarine Fan in Zhujiang Formation,Baiyun Sag

The deep-water Zhujiang Formation in Baiyun sag of Pearl River Mouth basin has been a new area for hydrocarbon exploration and development, but there is still much controversy about the genesis of massive sandstone reservoirs. Based on comprehensive analysis of composition, sedimentary structures, grain size distribution, ancient topography as well as seismic and logging data, the Zhujiang Formation was deposited by submarine fan system, and a wide range of thick massive sandstoneswere products of sandy debris flow filling withininner-middle fan channels. According to detailed features and identification signs, the sandy debris flow was related to gravitational slump and sand collapse of sandbodies from the shelf edge delta front triggered by certainmechanism duringsignificant sea-level falling, and then the “Source-Drainage-Sink” coupling model of sandy debris flow deposits in submarine fan was set up.