Abstract:Many years,prospecting practice showed that Jizhong depression,Jinan area and Tang yin fault depression of Taihangshan piedmont depression are complex oil/gas accumulational zone where the source rocks are in Palaeogene and Carboniferous-Permian and main body of reservoirs are buried-hill reservoirs taking the form of "source in young formation and reservoir in old formation" and "source both in young and in old formation and reservoir in old formation".The Jidong depression has been in the epoch of deep buried-hill exploration in recent years,10 paleo-buried-hills are discovered in the northeast of Jidong by using gravimetric,magnetic,electric and seismic exploration data and 5 buried-hills have been drilled,among which 2 buried-hills have gained industrial gas stream and 2 buried-hills have obtained low-productivity gas stream;Large-scale buried-hills of "source in young formation and reservoir in old formation and reservoir in old formationXinglonggongbei and Gu’an buried hills have been discovered separately in Baxian depression and Lang?Gu depression.The paper expounded the size of gas reservoirs of Matou and Hancun buried-hills that have gained low-productivity gas stream and their source rocks mainly are Carboniferous-Permi-an coal measures,put forward the geologic and geophysical bases why did these two large-scale buried - hills of "source in young formation and reservoir in old formation"-Xinglonggongbei and Gu’an buried hills exist and their oil-bearing prospect and proposed corresponding suggestion on the oil/gas exploration issues how to further know and define above mentioned paleo-buried-hills.The authors considered that the region could become exploration battlefield achieved strategic breakthrough and surprised success.