Full Waveform Modelling for Subsurface Characterization with Converted-Wave Seismic Reflection: Residual PP Removal on PS Component Using F-K Filter

Abstract

The application of converted-wave seismic method in hydrocarbon exploration has increased significantly. Since the conventional seismic ceases to provide an adequate image in complex geology area and it often provides an ambiguous bright spot response. The main principle is that an incident P-wave produces reflected and converted P and SV wave on an interface. Converted-wave seismic uses the multicomponent receiver that records both of vertical component and horizontal component. The vertical component is assumed to correspond to the compressional PP wave and the horizontal correspond to the PS converted-wave. In this and previous research (Viony and Triyoso, 2018), a synthetic seismic data with the shallow gas and the salt dome model are constructed by the full-waveform modelling. The purpose of this study is to improve the imaging quality on the PS section and the PS AVO curve due to the existence of the residual PP events on the horizontal data in the previous study (Viony and Triyoso, 2018). The PS gather has been NMO corrected by the PP velocity. Therefore, the residual PP reflections are well-corrected and the PS reflections are under-corrected. To obtain the more reliable PS data, the residual PP reflections have been removed by rejecting the well-corrected data in f-k filtering process. The results of this study present that the imaging quality and the AVO of the filtered PS is better and more reliable than the un-filtered PS in the previous study (Viony and Triyoso, 2018).