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深水水道体系是近年来在白云-荔湾凹陷东缘珠江组上段深海泥岩背景中新发现的大型深水沉积体系,但是其沉积特征、沉积过程与主控因素尚不清楚.综合利用大量二维、三维地震数据以及钻井、测井资料,揭示了白云-荔湾凹陷东缘珠江组大型深水水道体系的沉积要素构成、外部几何形态、内部充填结构及其沉积演化.在此基础上,进一步探讨了物源供给、陆架坡折带、古地貌对深水水道体系的控制作用,明确了其主控因素,提出了“源貌共控”的成因机制.研究表明珠江组大型深水水道体系由水道、天然堤和朵叶3种沉积要素构成,并以水道为主体.从北至南可依次细分为白云凹陷段、南部隆起段和荔湾凹陷段,其中白云凹陷段以侵蚀型水道为主,南部隆起段以侵蚀-加积型水道为主,荔湾凹陷段以加积型水道为主,在空间上构成了重力流流体能量逐级递减的“三级水道”充填演化特征.3个分段水道内部均可识别出两期水道事件,且充填样式各具特征.珠江组深水水道体系的发育与展布受北部珠江三角洲体系、陆架坡折带和限制性地貌3大因素共同控制.
The deepwater channel system is a newly discovered large-scale deep-water sedimentary system recently discovered in the background of the deep-sea mudstone in the upper part of the Pearl River Formation in the Baiyun-Liwan Sag, but its sedimentary characteristics, depositional processes and main controlling factors are still unclear. Comprehensive utilization of a large number of 2D and 3D Seismic data and drilling and well logging data reveal the sedimentary elements, external geometry, internal filling structure and sedimentary evolution of the Zhujiang Formation large-scale deepwater water system in the eastern margin of Baiyun-Liwan Sag.On the basis of this, Supply, the continental slope break belt and paleogeomorphology to the deepwater waterway system, the main controlling factors are clarified, and the genesis mechanism of “source and topography common control” is put forward.The research shows that the large deepwater waterway system in the Pearl River Group consists of watercourse, The dike and the leaf are composed of three kinds of sedimentary elements and are mainly watercourses, and can be subdivided into the Baiyun sag, the southern uplift and the Liwan sag in turn from north to south, of which the Baiyun sag is dominated by erosive channels and the southern uplift The section is dominated by erosion-accretion type aqueduct. In Liwan Depression, the accretion type aqueduct is the main part, and the “tertiary water ”The evolution of the filling characteristics of the three sections of the waterway can be identified within the two phases of watercourse events, and filling patterns have different characteristics of the Pearl River Group deepwater water system development and distribution by the North Pearl River Delta system, continental shelf slope break and limit Geomorphology 3 major factors common control.