MULTIPLE PREDICTION USING THE HOMEOMORPHIC-IMAGING TECHNIQUE

A new method for predicting different kinds of multiples and peg-leg r eflections in unstacked seismic data is discussed. The basis for this method is the fact that kinematic properties of multiples can be repre sented as a combination of kinematic properties of primary reflections . The prediction is made using a two-step process. In the first step, the values for the angle of emergence and radius of curvature of the w avefront for primary reflections from 'multiple-generating' interfaces are obtained. These parameters are estimated directly from unstacked data for every source point using the homeomorphic-imaging technique. The second step consists of prediction of multiples from primary refle ctions that satisfy a so-called 'multiple condition'. This condition i s the equality of the absolute values of the angles of emergence calcu lated from the first step. This method is effective even in complex me dia and information on the subsurface geology is not required. The par ameters are estimated directly from the unstacked data and do not requ ire any computational efforts such as in wavefield extrapolation of da ta.