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本文根据介形类化石、化石韵律性和化石共生组合,认为东营凹陷沙河街组三段上部至沙二段是一套连续的河、湖相沉积。凹陷西部一直是湖盆的沉积中心区;凹陷的东部和中部是不同沉积时的湖盆边缘。湖岸线随19个沉积时环境的变化而摆动。湖盆自东向西逐渐退缩,至沙二段末期湖盆全部淤塞,结束了这一套河、湖相沉积。
According to the association type of fossil, fossil fossil and fossil assemblage, this paper considers that the upper part of the third member of Shahejie Formation in Dongying Depression and the second member of Shahejie Formation are a set of continuous river and lacustrine sediments. The western part of the depression is always the sedimentary center of the lake basin. The eastern and central parts of the depression are the edge of the lake basin when they are deposited differently. The lakeshore line swings with 19 changes in the depositional environment. The lake basin receded gradually from east to west, and all the lake basins were blocked at the end of the second member of Shahejie Formation, ending the deposition of this set of rivers and lakes.