Method and device for enhancing reflection information based on pre-stack time migration

The method for enhancing reflection information based on pre-stack time migration comprises the following steps: (1) seismic data and a speed model are input, and imaging parameters are set; (2) data preparation calculation is performed on each input seismic channel before imaging; (3) travel time calculation and amplitude weighting are carried out on all imaging points, for each imaging point, the radius of a Fresnel zone is calculated, the radius of the Fresnel zone is multiplied by a proportionality coefficient to serve as an imaging area, the proportionality coefficient can be controlled through input parameters, mesh generation is carried out on the imaging area, the size and range of a generation mesh are controlled through the input parameters, imaging results on the generation points are calculated respectively, and the imaging results on the generation points are collected together to serve as the imaging result of the imaging point; and (4) calculation in the step (3) is performed on all input chann