Identification method and application of concealed fault recognition in Wangji area of Biyang sag

Located in the northern slope belt of Biyang sag, Wangji area is an inherited nose structural belt and has a complex fracture system in the area, the fault block reservoir of the concealed faults has no obvious characteristics in the conventional surface interpretation section, and the trap is difficult to be identified. Based on the whole understanding of structural characteristics of Wangji area, from the perspective of seismic identification, the concealed faults in Wangji area are classified as small faults in the upper subsection of He-3, faults in the lower subsection of He-3 and detachment faults. By using drilling data and combining structural steering filtering, coherence and frequency division techniques, the precision of concealed fault identification was effectively improved, and a number of fault block traps controlled by concealed faults were found.