陆架边缘三角洲的研究现状及其意义

陆架边缘三角洲主要发育于陆架和陆坡之间，由物源越过陆架坡折快速在陆坡堆积而形成，物源因素是其生长进积的主要因素。由于陆架边缘三角洲在陆架边缘附近具有最大的沉降速率因而使得其在平面主要呈弓形或新月形状，纵向剖面上向海和向陆各出现一个楔形斜坡体。加强对陆架边缘三角洲的研究，对于寻找深海陆坡低位扇，进而寻找有利油层储集体具有重要意义。

Study Situation of Shelf-Margin Delta and Its Significance

A shelf-margin delta is mainly built up between shelf and slope, where sediments pass across the shelf break and settle down quickly to form the delta. Plentiful sediment supply is the dominant factor of the rapid deltaic progradation. Owing to the maximum sedimentation rate, the shelf-margin delta close to the shelf break is generally bow-shaped or crescent in form, and in the longitudinal section, a wedge slope body is formed both in the landward and seaward directions. It is significant to enhance the research of shelf-margin delta in order to look for lowstand fans on the deep slope and then for favorable oil reservoirs.