Normal moveout correction (NMO) distortion area automatic identification and removal method based on forward modeling

The invention belongs to the technical field of oil and gas field exploration, and discloses a NMO tensile distortion area automatic identification and cutting method based on forward modeling, and the method comprises the steps: obtaining an elastic parameter of a CMP gather underground medium through well data, and building a medium model; carrying out AVO forward modeling on the medium model based on a Zoeppritz equation, and simulating to obtain a forward modeling AVO gather which is consistent with a CMP gather wave field feature and does not contain a normal time difference; performing correlation analysis on the forward modeling gather and the CMP gather; and identifying the region of which the correlation is lower than a threshold value as a seriously distorted region and removing the seriously distorted region. According to the invention, NMO distortion resection processing and forward modeling are combined, and a set of feasible method for automatically identifying and resection a distortion area by