Deghosting via Warping

We present a new method to remove ghost signal from conventional streamer marine data. The method assumes that each ghost component of the recorded signal is a deformed version of the desired signal, which is free of ghost recorded energy. The free of ghost signal can be transformed into each ghost component by applying a shift in time and a proper amplitude scaling, forming an equation system where it is the unknown vector. The transformations involved in the solution of this system, are carried out by a warping algorithm. The construction of warping operators comprises the computation of traveltime and amplitude for each reflected wave. We applied the method in a deep-water 2D line from the pre-salt area in Brazil. In this case, we use a NMO approximation for time-shift calculation and do not apply any amplitude scaling. The results are compared with those obtained without the deghosting and show considerable gains in the bandwidth, promoting outstanding benefits in the imaging and inversion.