Kirchhoff beam migration method in a complex topography

摘要

The present invention discloses a Kirchhoff beam migration method in a complex topography. The Kirchhoff beam migration method includes the following steps for entering relevant parameter files, migration speed model and seismic records; dividing the seismic recordings of each shot into a plurality of different time domain data volumes with a window center as a core and then decomposing the data into plane waves; patterning radii from strike points in different directions, and calculating the corresponding information of the grid nodes in the context of a radial sectional beam for storing each ray; drawing radii from the center of the window in different directions, and calculating the corresponding information of the grid nodes in the context of a radial sectional beam for storing each ray; selecting the beam from the shot points and the center of the window for calculating the imagery; and accumulating imaging results from all beam pairs to obtain the migration imaging results. According to the Kirchhoff beam migration method, beam coverage in a shallow model is enhanced, as well as the imaging quality of the Kirchhoff beam migration method in a shallow structure of a complex topography model .