Study on fault associated crack development characteristics and simulation experiment about the buried hill reservoir in the Beier Sag, Hailer Basin

The discovery of the buried hill reservoir in the bedrock of the Hailar Basin has broadened the exploration areas of the peripheral oil fields of Daqing oil field. The crack is one of the main reservoir space of the buried hill reservoir in the bedrock of the Beier Sag. To find out the development characteristics and distribution rules of the buried hill cracks, based on a lot of the core observation data, the author studied the development characteristics of the crack such as the types, density, width as well as filling period and development characteristics of the bedrock faults. It is concluded that there were three types faults which were early extensional faults, early extensional middle tensional-shear long-term active faults and early extensional middle tensional-shear late inverse long-term active faults. Their geometry characteristics, distance of the fault and the imaging logging data indicate that the crack is mainly formed in the process of the fracture structure, and the multi stages of fault act