Abstract:Dongpu Sag is a continental faulted lake basin in the southwest of Bohai Bay Basin.The sedimentary evolution of the basin in the Paleogene is significantly affected by frequent tectonic activities.In this paper, through the study of ancient Sha-he-jie formation conglomerate characteristics of clastic rock, especially the basin edge, and analyzd the characteristic of the different tectonic transformation time of sediment type change, cleared sedimentary response of faulting in different periods: basin formed Lanliao fracture activity, small things on both sides of the content source type difference, form is relatively single, give priority to with Mesozoic clastic rock;With the increase of frequent tectonic activity and the basin area,Wenxi, Weixi, Guanchen, Mazhai, Machang and San-chun-ji fault activities in the Sha-san-xia, such as lake basin water deepened, and multiple settlement center, things on both sides of the change of sedimentary system and material sources, gravel composition displayed on the provenance of clastic rocks, upper palaeozoic carbonate rocks and lower palaeozoic era, the Mesozoic volcanic rocks and the archean erathem basement metamorphic rocks increases gradually, on the east side of material proportion, upper palaeozoic increases;The activities of the placanticline fault and the Yellow River fault in the middle of sha-san resulted in significant north-south differences, multi-source mixing and the highest complexity of gravel composition. Due to the fault activities in the northern part of the second shahe period, such as Wendong, Weidong and Wen-ming-zhai, the subsidence range of the eastern sag increased, and the Paleozoic clastic rocks and lower Paleozoic carbonate rocks above the gravel composition of the near-source materials in the east side were mainly Paleozoic clastic rocks and lower Paleozoic carbonate rocks. The change of sediments directly reflects the strength of tectonic activities in each period, and records the evolution history of the basin, which is of great significance for understanding the development of reservoir sand bodies and the distribution of hydrocarbon source rocks under the influence of synsedimentary fault activities.