Buried Hill Structure and its Oil Accumulation in Machang Region,Dongpu Depression

According to interpreting seismic cross sections,four structural patterns of buried hill are put forward,they are step-like horst buried hill,asymmetry half-horst buried hill,tilt asymmetry half-horst buried hill and high range asymmetry half-horst buried hill.Thus the top face topography of block buried hill can be summarized as:the southern part is high,wide and gentle,while the northern part is low,narrow and steep.The oil accumulation of buried hills in Machang reign are also discussed integrated by strata and production data.Because abundant cracks formed by weathering and erosion,terrain height formed by tectonic tilting and the functions of oil-gas migration channel and sealing which the cutting faults play,buried hill reservoir can be recognized as the advantaged reservoir for petroleum exploration.