We have developed an enhanced methodology for creating a 3D seismic migration volume from a set of 2D seismic lines. The key challenge is to interpolate coarsely spaced 2D seismic lines into a dense 3D seismic volume before performing a post-stack migration. This requires interpolation across distances far in excess of standard seismic interpolation approaches’ limitations. Building a geologic time model which essentially consists of a dense set of automatically generated geological time horizons and using them to guide the interpolation is a practical approach to address the coarse sampling issue. Successful application of the enhanced methodology to a data example from the North Sea demonstrates its effectiveness.