Research On Evolvement Of Buried Hills And Favourable Reservoir Distribution In J₃b In Beier Depression

By use of geological data such as Seismic,well logging ,lithology, produce testing etc. ,the structure characteristic is studied and the evolving process of buried hills is reversed ,the results show that there exist three kinds buried hills: the early formed palaeogeomorphology ,the medium-term formed distortion and temporaneous buried hills controlled by temporaneous faults .The early formed palaeogeomorphology develops in the north and south of SuDeerte Buried Hills Belt, the distortion mainly covers in the centre of the belts and the temporaneous exists in the HuoDuomoer structural belt.The fracture-hole double medium porosity mode develops distinctly in the research area, fracture and secondary bole-hole are the most important reservoir type and accumulating space for oil. The fracture is dominated by faults, while the effective fracture(relative to reservoir)is controlled by the faults which was active lately(K₁Y₃ ).The fractal theory is tried to predict the whole distribution of fracture and where the favorable effective fracture developed are the base-connected slip fault belts developed at the end of K₁Y. the corrosion reservoir is related with the exposure time and the palaeogeomorphology. The uplift in north and south part of the buried hills belts is significantly and exposed with a long term on the surface , this means the corrosible reservoir can develop best in this place;the west slope of Beier depression was exposed until K₁N₂ deposited, therefore ,the secondary bole-hole can develop better here.