Interferometric redatuming by multidimensional deconvolution

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Abstract

Seismic reflection imaging is a popular method to image, characterize and monitor the Earth's subsurface. In this method, seismic signals are sent into the subsurface and their reflections are collected. Strong heterogeneities in upper sections of the subsurface often pose a problem for imaging deeper sections. To overcome these problems, it has been proposed to place receivers in a horizontal, deviated or vertical borehole and to turn these receivers into virtual sources by seismic interferometry. In this thesis, the correlation-based formalism that undergirds seismic interferometry is replaced by multidimensional deconvolution, yielding several important advantages. It is shown that multidimensional deconvolution improves the radiation pattern of the generated virtual sources and that it removes undesired artifacts. A range of applications is being discussed, including the retrieval of signals from background noise, subsalt imaging and reservoir monitoring.