Types of Buried Hill and Its Hydrocarbon Accumulation in Jizhong Depression

On the basis of buried hill classification methods and geological background of buried hill formation and causes,buried hills could be divided into landform buried hill and tectonic buried hill in Jizhong Depression, and could be further divided into 10 subtypes. Buried hill in Jizhong Depression was formed in special structural background and was combined into Raoyang-style and Baxian-style in space. Different types of buried hills have different distribution laws and reservoir conditions. Four kinds of buried hill reservoirs, such as single-cut type, step-fault-type, slope- type and erosion- type are developed,in which single-cut type is the most developed buried hill reservoir, step-fault type and slope-style is in the second place, erosional form is the poorest.