Earthquake identification method for low-sequence fault under high stratigraphic dip angle condition

The invention relates to the technical field of oilfield development, in particular to an earthquake identification method for a low-sequence fault under the condition of a high stratigraphic dip angle. The method comprises the following steps: performing frequency division diffusion filtering processing on post-stack seismic data; carrying out gradient characteristic attribute calculation on the processed seismic data to obtain horizontal, vertical and diagonal gradient data of the seismic data; performing dip angle attribute calculation on the seismic data to obtain dip angle data of the seismic data; judging whether the stratum is inclined or not and the inclination direction of the stratum according to the inclination angle data, and performing gradient replacement according to different conditions; dividing the seismic image into a stable event and a non-stable event, performing gradient correction on the gradient data after gradient replacement according to different conditions, and constructing a struc