Residual static correction method and residual static correction system for forward first break traveltime

The invention provides a residual static correction method and a residual static correction system for forward first break traveltime. The residual static correction method comprises the following steps of: performing first break picking on acquired seismic data to generate a first first-break time between each of excitation points and each of receiving points; generating a horizontal datum planestatic correction amount according to a near-surface velocity model generated by performing tomographic inversion on the seismic data; performing ray tracing on the near-surface velocity model to generate a second first-break time between each of the excitation points and each of the receiving points; generating the residual static correction amount of each excitation point and the residual staticcorrection amount of each receiving point by using a Gauss-Seidel iterative according to each first first-break time and each second first-break time; and adding the horizontal datum plane static correction amount with the re