Separation of Seismic Diffraction and Reflection Using Dip Frequency Filtering

Abstract

An existing theory of diffraction imaging from the zero-offset seismic section explains the geometric pattern of the subsurface reflectors. Curvature of diffraction hyperbola is mainly dependent on the velocity of the medium and depth of discontinuous reflector. These diffraction hyperbolas are indication of fault, fracture, and pinch-outs. During the imaging because of choosing incorrect aperture and processing parameters, we might lose the information of diffraction. In this research work, diffraction imaging is performed by separating the diffractions from reflection data. We have developed a new workflow using f-k domain which is called frequency filter for separating only diffraction depending on the dipping angle of reflectors. The validation of method is completed on synthetic seismic reflection data set from one of Malay Basin field. Geological model comprises of a small part of the field which incorporates highly dipping faults and fractures.