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根据钻孔的沉积相序将长江三角洲分为三角洲主体、三角洲南翼和北翼等 3个基本的地层分区 ,鉴于两翼前缘和后缘的相序具有很大差异 ,因而两翼均划分出前缘和后缘 2个亚区。地层结构的不同决定了与沉积层有关的潜在环境问题和灾害的分布 ,三角洲南翼和北翼的后缘为地面沉降发育区和潜在发育区 ,北翼的前缘为地下海水入侵的潜在发育区 ,三角洲主体是污染江水的潜在渗滤区 ,现今河口为底辟构造潜在发育区
According to the sedimentary facies sequence of the boreholes, the Yangtze River Delta is divided into three basic stratigraphic subdivisions such as the delta main body, the south wing of the delta and the north wing. Because of the great difference in the phase sequence between the leading and trailing edges of the two wings, And rear edge of 2 sub-regions. The differences in stratigraphic structure determine potential environmental issues and disasters associated with the sediments. The trailing edges of the southern and northern flanks of the delta are land subsidence and potential development zones. The leading edge of the north flank is potential for marine water intrusion The main body of the delta and delta are the potential infiltration areas that pollute the river water. Currently, estuaries are the potential developmental areas for the diapir