Study On Fault System Of Beier Depression

By anatomy and collation to faults in different structural layer in Beier depression, 4 types of fault are identified, these are early extended faults, middle strike-slip faults, early extended and middle strike-slip faults active in a long time, and early extended faults, middle strike-slip and later reversed faults active in a long time. Three divided fault system are early extended fault system, middle strike-slip fault system and later reversed fault system. According to basin evolution and fault activity, it's considered that Beier depression was original chasmic stage in K1t and K1n1, fault deformation become stronger and local fault control sediment, as extended depression basin; in K1n2 especilly at the end of K1n was the period of deformation and great extension of fault, as typical fault-depression basin; in K1d, fault-depression decreased, part fault control sediment, and it almost stopped in K1d2, as extended fault-depression basin; in K1y, fault become strike-slip shear deformation, as depression basin; since K2q, local fault reversed and deformed, becoming depression basin characterized by local reversion.By anatomy to reservoir, the accumulation for sudeerte is oil from connected source-reservoir migrate along the strike of fault and then migrate laterally to buried hill; for Beixi slope area, oil out of kitchen migrate long distance and accumulated by antithetic fault screened; for Huoduomoer K1n formation, oil from the boundary of kitchen migrate along sandbody in short distance and accumulated by trunk boundary fault screened; for Beizhong K1n formation, oil inside kitchen migrate laterally to arch and accumulate; for K1d formaton in Beier depression, reversed faults regulate oil from K1n migrate to K1d to accumulate as secondary reservoir.