Effective suppression of spurious events when generating reflected P- and PS-wave data using seismic interferometry

Abstract

Seismic interferometry is a technique for generating new seismic responses by cross-correlating seismic observations at different receiver locations that is gaining popularity for imaging and monitoring subsurface structures below a complex overburden. In seismic interferometry, extracting an exact response is an important issue. The energy of a stationary zone contributes to the collection of correct events, but the energy of a nonstationary zone causes spurious events. The cross-correlation gather has both stationary energy and nonstationary energy. If the nonstationary energy in the cross-correlation gather is not canceled out during stacking, it introduces spurious events in the stacked result. In this study, we present a simple and effective method for suppressing the spurious events that occur during the generation of virtual source data by using f-k filtering with edge muting. In a test using synthetic multicomponent data created under the geometry of the Ocean Bottom Cable survey, the proposed method successfully suppressed spurious events in multicomponent interferometric data. (C) 2014 Elsevier B.V. All rights reserved.