Aliased Groundroll Reconstruction Using Gradients
N. Allouche, P. Ras and A. Özbek
Event name: 77th EAGE Conference and Exhibition 2015
Session: Seismic Acquisition - Land and Marine
Publication date: 01 June 2015
Info: Extended abstract, PDF ( 1.71Mb )
Price: € 20
Land seismic acquisition requires a dense receiver grid in order to deal with groundroll. Relaxing the spatial sampling requirement will help reduce the field effort and improve the efficiency of the seismic acquisition. In this paper, we show that the spatial sampling interval can be increased by up to 3 times Nyquist when the vertical wavefield and its spatial gradients are used for wavefield reconstruction. To test this approach, a field data set was acquired where spatial gradients were estimated by differencing the response between two geophones. These field data are decimated and subsequently reconstructed to a dense spatial grid using a matching pursuit based method. The results are discussed and evaluated to assess the order of aliasing that can be recovered when gradients are used.