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黄河三角洲前缘粉砂分布于河口外中部,三角洲侧缘或分流间湾黏土质粉砂分布于三角洲前缘粉砂体的两侧。分流改道时新的分流河口大多分布在老叶瓣三角洲侧缘或分流间湾位置。这样,年轻的三角洲前缘粉砂覆盖在老三角洲侧缘或分流间湾黏土质粉砂之上,与此同时,年轻的三角洲侧缘或分流间湾黏土质粉砂覆盖在老三角洲前缘粉砂之上,形成规律性的叠覆层序。在观察钻孔岩心时,正确判断某一层的沉积环境,追踪其物质来历,即判断是从哪一条分流河道搬运来的物质形成的,该分流河道的活动年代就是该层形成的年代。
The leading edge of the Yellow River Delta silt is located in the central part of the mouth of the estuary. The margins of the delta or shoal bay clay silt are distributed on both sides of the delta front silt body. The new diversion estuary at the diversion diversion most of the distribution in the old leaf delta side edge or shunt bay position. In this way, young delta front silt covers the margins of the old delta or shunt bay clay silt, while young delta margins or shoal bay clay silt cover the front of the Old Delta Above the sand, a regular overlying sequence is formed. When observing the borehole core, the sedimentary environment of a certain layer is correctly judged and its material origin is tracked. That is, it is determined from which distributary channel it is transported from. The age of this distributary channel is the age at which this layer was formed.