Zero-Offset Modelling and Simulated Migration by One-Way Wavefront Construction

P263 Zero-offset modelling and simulated migration by one-way wavefront construction Abstract 1 Assuming a zero-offset configuration of sources/receivers we present an approach to forward modelling based on a one-way wavefront construction process progressing upward from a selected target reflector. Subsequent simulation of migration amplitudes along this target reflector yields reliable estimates of amplitudes from a zero-offset depth migration and a quick (but less accurate) indication of small-offset depth migration amplitudes. The one-way wavefront construction process is based on theory permitting quantities related to the two-way wave propagation (accumulated reflection/transmission coefficients geometric spreading and phase shift due to caustics) to be