In Search of the Primary Wavefield: Demultiple and Deghosting Applied to East Coast Marine Data

GeoConvention 2016, Expanded Abstract
Richard Bale and Keith Wilkinson

Marine seismic data from the East Coast of Canada can pose processing challenges due to shallow water depth and hard water bottoms. We discuss two important steps that are necessary to obtain a broadband primary wavefield in these environments: multiple attenuation and deghosting. Our multiple attenuation, based upon the technique referred to as “Model-based Water Layer Demultiple”, uses a two-pass methodology to ensure both source-and receiver-side peg-legs are treated correctly. Our deghosting method is applicable to variable depth of receiver below the sea surface. We illustrate application of both demultiple and deghosting on data acquired in the Flemish Pass area of East Coast Canadian waters.