关键词: 洪积扇, 冲积扇, 勘探前景, 断层控制, 志留系, 油田, 岩性圈闭, 潜山油藏, 推覆体, 断块油藏

Abstract: There are two characteristics in the Silurian buried hill oil pool and Cretaceous alluvial fan pool in Yaerxia Oilfield: (1) Both the buried hill and alluvial fan are resulted from the Y-509 fault,which are a pair of coexisting geologic bodies. When the basin boundery was controled by the fault, the coexisting geologic bodies were distributed along both sides of the fault as alluvial fan groups and their mountain chains, which is a favorable zone for the hydrocarbon exploration. (2) The alluvial fan which have developed for a long period is the fluvial deposits in a smaller area with great thick-ness,well-developed sandbodies, and variation in lithology.Therefore,it formed a reef-like and stacked lithologic trap which is rich in hydrocarbon in the alluvial fan apron. This kind of trap can be explorated as an important locality prior to other areas.