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Collaborating Authors
Results
Aperiodic wavefield signal apparition: Dealiased simultaneous source separation
van Manen, Dirk-Jan (ETH Zürich, Seismic Apparition GmbH) | Robertsson, Johan O. A. (ETH Zürich, Seismic Apparition GmbH) | Eggenberger, Kurt (Seismic Apparition GmbH) | Andersson, Fredrik (Lund University) | Amundsen, Lasse (NTNU Trondheim)
Cyclic convolution in the spatial frequency domain is used to generalise the signal apparition concept to the case of aperiodic variations in the source activation parameters. The separation is formulated as a leastsquares reconstruction in the frequency-wavenumber (f k) domain. The methodology is used in combination with normal Figure 1: Left (a): Conventional acquisition: all signal energy moveout correction to de-alias the sim-source separation and sits inside a signal cone (yellow) bounded by the propagation enables shooting on position in sim-source acquisition.
ABSTRACT Marine seismic data are distorted by ghosts as waves propagating upwards reflect downwards from the sea surface. Ghosts appear both on the source-side as well as on the receiver-side. However, whereas the receiver-side ghost problem has been studied in detail and many different solutions have been proposed and implemented commercially, the source-side ghost problem has remained largely "unsolved" with few satisfactory commercial solutions available. In this paper we propose a radically new and simple method to remove sea-surface ghosts that relies on using sources at different depths but not at the same lateral positions. The new method promises to be particularly suitable for 3D applications on sparse or incomplete acquisition geometries. Presentation Date: Tuesday, October 18, 2016 Start Time: 4:10:00 PM Location: 163/165 Presentation Type: ORAL