Spatial sampling determination method meeting pre-stack migration requirement

The invention discloses a spatial sampling determination method meeting the pre-stack migration requirement and belongs to the field of geophysical exploration. The spatial sampling determination method meeting the pre-stack migration requirement comprises the steps that the root-mean-square speed is obtained according to seismic data of earthquakes in the past, the highest frequency of a calculation area is obtained according to the processed known seismic data of the earthquakes in the past, the dip angle of an oblique reflecting stratum is obtained according to known geological data or seismic interpretation data measured in the past, the spatial sampling interval of the oblique stratum is determined according to the dip angle, the expected highest frequency and the root-mean-square speed of an overlying stratum, the diffracted wave dynamic correction time difference is calculated, and the differential of the anti-wave time obtained after dynamic correction to the spatial sampling interval is obtained, and the spatial sampling interval is determined according to the spatial sampling theorem. According to the spatial sampling determination method meeting the pre-stack migration requirement, the spatial sampling interval can be determined by combining the dip angle of the oblique stratum and the root-mean-square speed with the expectable highest frequency of an effective signal needing to be protected, and the requirement for pre-stack migration imaging is met.