Azimuth extraction gather consistency processing method

The invention provides an azimuth extraction gather consistency processing method. The main process comprises the following steps: pre-stack gathers of seismic data acquired in two different periods are analyzed; the azimuth is calculated by calculating the positions of shot points and receiver points of common-reflection-point seismic gathers acquired in different periods; and the common-reflection-point seismic gathers of the latter period are extracted according to whether the azimuths are consistent or not by taking the data acquired in the former period as a reference gather and the data acquired in the latter period as a monitoring gather, and observation system degradation is performed. Therefore, the azimuths of the common-reflection-point seismic gathers of the seismic data acquired in the former and latter periods are consistent or close, the influence of anisotropy brought by position inconsistency is reduced, and the consistency between the seismic data acquired at two times is improved. The method has the advantage that the waveform of seismic traces is not additionally processed, the influence of aliasing on seismic signals is reduced, the method is accurate and reliable, and the influence of anisotropy on seismic data inconsistency is well solved.