Wavefield Separation of Multicomponent Land Seismic Data Using Spatial Wavefield Gradients
C. Van Renterghem, C. Schmelzbach and J.O.A. Robertsson
Event name: 78th EAGE Conference and Exhibition 2016
Session: Multi-component Seismic Data Processing
Publication date: 31 May 2016
Info: Extended abstract, PDF ( 1.31Mb )
Price: € 20
Land seismic recordings at the Earth’s surface register the sum of the upgoing, downgoing reflected and downgoing mode-converted wavefields. However, for true amplitude and phase imaging and subsurface characterization, records of the upgoing wavefield only are desired. We present an approach to isolate the upgoing wavefield for individual densely spaced receiver groups based on the elastodynamic representation theorem. We make use of spatial wavefield gradient estimates derived from multicomponent sensor groups, which allows approximating the wavefield separation expressions with compact filters. Our method does not make any assumption regarding single or isolated arrivals. Compared to the traditional approach of multicomponent data interpretation, which assumes vertical wave propagation, our approach incorporating spatial wavefield gradient estimates significantly improves the separation results up to incidence angles of around 25° and 50° for the horizontal and vertical components, respectively.