Fault zone is a complex three-dimensional geological body with heterogeneous structures which can be divided into unit types with different properties, such as low-permeability slip damage zone and high-permeability induced fracture zone and so on. Controlled by various geological conditions and factors, internal structures of fault zone in different kinds and activity intensity faults, hanging wall and footwall, different depth of growth fault are different, which make faults having dual nature and temporal and spatial differences in transporting and sealing oil and gas: induced fracture zone can be the channel of transporting oil and gas, but slip damage zone has a strong horizontal segregation; Oil and gas horizontal sealing of the lower part of growth fault is obviously stronger than the upper; Oil and gas transporting capacity of fault in early and middle fault activity is stronger than in late and resting stage. Meticulous depiction of internal structure of fault zone inside basin is great significant in analysis the role of fault in the oil and gas migration and accumulation.