摘要：

东濮凹陷西洼南段老第三系属地堑型湖盆沉积，主要发育河流相、三角洲相、冲积扇相、扇三角洲相以及湖泊相。两条边界断层，尤其是西侧长垣断层的活动性控制着该区的岩相古地理格局：断层活动强烈时，湖盆水域扩大，湖水加深，主要发育扇三角洲、三角洲及深湖－半深湖沉积；断层活动减弱时，水体变浅或干涸，湖盆被充填，主要发育冲积扇或河流相沉积。

Abstract:

The Palaeogene system in the Southern west sag of the Dongpu Depression consists of riftlacustrine deposits and developed with fluvial, delta, alluvial, fandelta and lacustrine facies. The lithofacies paleogeographic features of the district are controlled by activity of two boundary faults, especially the Changyuan fault at the western side. A strong movement of the faults results in increasing in basin size and water depth, and developing fandelta, delta and deep-semideep lake facies. A weak movement of the faults results in shallowing and filling of the lake basin, and developing alluvial fan and fluvial facies.