4. Data Processing/Signal Processing
Seismic Interferometry with Seismic Background-noise Field Data
Deyan Draganov(1), Kees Wapenaar(1), Wim Mulder(2), Johannes Singer(2) and Arie Verdel(2)
(1) Delft University of Technology, The Netherlands. (2) Shell International E&P, Rijswijk, The Netherlands.
Abstract
Seismic interferometry is the process of creating new seismic records from the crosscorrelation of existing ones. In recent years, several authors from different scientific field developed the theory and applied it to synthetic data. In the seismic (exploration) practise, a very interesting application of seismic interferometry is in the reconstruction of the reflection response at the Earth's surface from seismic background noise. This means that seismic receivers record at the surface the response of the Earth to different sources in the subsurface for a long time and subsequently these recordings are crosscorrelated to reconstruct the Green's function of the subsurface. With field data, the only success until now is in the reconstruction of surface waves arrivals from earthquake coda and microseisms. We applied the seismic interferometry method to seismic background-noise data recorded in a desert area with the aim to reconstruct reflection events. The recording array consisted of 17 3-component geophones arranged in a single line. The specific site was chosen so that during the recording hours the man-made noise will be minimal and that there will be an active reflection survey in the area for comparison of the results. The seismic interferometry result shows inclined and horizontal coherent events. Some of the reconstructed horizontal events align with reflections from the active reflection survey along the same line. This suggests that these events can be interpreted as reconstructed reflections. However, for the moment, we cannot exclude alternative explanations
Last modified: Mon May 22 14:47:19 2006