Pool features and hydrocarbon distribution of the buried hills in the eastern sag of Liaohe depression,China

The Ciyutuo,Sanjiepao and Youyangou buried hills are collateral transfer zones and are distributed along NE direction structural belts in the eastern sag the Liaohe depression.The first and third members of Cenozoic Shahejie Formation and the Jurassic are the main source rocks of the buried hill pools.The reservoir rocks are Archaean granite, Lower Paleozoic carbonate rocks,Mesozoic sand rock and volcanic rock and fracture,solution cavities and pores are the major preserving spaces.The cap rocks are the Shahejie Formation,Mesozoic and Lower Paleozoic mudstone and the Fangshenpao Formation volcanic rock.The buried hill pools can be divided into hill-top type and inside-hill type.The hydrocarbon pools are basically distributed close to the fractural belts near source rocks.The cap rocks are the important condition of the oil and gas pools.The buried hills make the complex oil-gas accumulation belts.