Bedrock buried hill reservoirs in Beier Depression belong to tight reservoirs with low to ultralow porosity and low to ultralow permeability

and have structural fractures as the main reservoir spaces.Mapping of these structural fractures is the premise and guarantee for looking for high quality reservoirs and improve exploration success rate.According to the top structural form of bedrock and distribution of basement faults in Beier Depression

we mapped two types of structural fractures by using curvature method and finite element numerical simulation method.One is fracture related to folds and the other is fracture related to faults.The fold-related fracture on top of the bedrock in Beier Depression are distributed mainly along strike

and are located in east of well Bei302-Bei13 and BeiD4 of west Beixi sub-depression

periphery of well Huo10 and Bei42 to Bei16 of Beizhong fault-uplift zone

and periphery of well Xi13-Xi5-De8 of Beizhong sub-depression.The fault-related fractures are mainly distributed in the southwest and central of Beixi sub-depression

periphery of well Bei30 of Beizhong fault-uplift zone

and periphery of well De8-Xi5.Cores observation shows that curvature-controlled dissolution fractures are common on top of the bedrock in well Bei16

which coincides with fracture prediction results.