Abstract：Late in the 1980's，Lujing depression (also called Mamuwusu depression)became a target of oil/gas exploration. In 1995，the industrial oil/gas stream was first gained at well Er-l,which proved that the depression has the conditions of oil/gas generation and accumulation. But the succeeding drillings (Er-2 and Er-3) have lost. In order to explore the next exploration direction in the region，starting with the structural and sedimentary evolution of the depression,the paper centered on study of characteristics of oil-generated strata，sedimentary fades of reservoir and favorable oil/gas accumutation area. Early-Middle Jurassic Dashankou Group and Cretaceous Mamuwusu Group are main oil-generated rock formation;Early Cretaceous Erjina Group is good reservoir;Early and Middle Yanshan-Movement-formed various local structural traps are capable of being oil/gas accumulated sites;Taoxi lower swell,Ma No.2 and Ma No.3 structural belts are favorable oil/gas accumulation zones. The paper suggested that the region has good oil/gas prospect.
