A new fault identification method for complex zones around the buried hill in Southwestern Bozhong Sag

Conventional fault identification methods (e.g.coherence, variance and edge detection) mainly rely on isochronous stratal slice.As for inner buried hills, however, these conventional methods can hardly provide the reliable identification results for they are characterized by large burial depth, low signal-to-noise ratio, high-dip formation and complex fault.In this paper, a new fault identification method based on dip coherence analysis was proposed based on adaptive median filtering and coherence analysis.The core of this method is to take the attribute cube of stratigraphic dip and azimuth as the direction constraint to the calculation of coherence cube so as to obtain dominant coherence cubes with stratigraphic direction, while establishing the coherence slice based on stratigraphic dip so as to highlight the faults of all levels.The advantage of this method is that it deepens the coherence analysis, overcomes the limitation of the original coherence calculation and solves the inaccuracy of the horizontal isochronal slice inside buried hill.The calculation results of actual data show that this method is simple and feasible and can effectively identify large, medium and small faults in high-dip complex zones, and its fault identification accuracy is significantly higher than that of conventional coherence cube method.