Using surface multiples to estimate primaries by sparse inversion from blended data |
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| Authors: | GJA Van Groenestijn DJ Verschuur |
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| Institution: | 1. ExxonMobil Upstream Research Co., PO Box 2189, Houston, TX 77252‐2189, USA;2. Delft University of Technology, PO Box 5046, 2600 GA Delft, the Netherlands |
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| Abstract: | For data acquired with conventional acquisition techniques, surface multiples are usually considered as noise events that obscure the primaries. However, in this paper we demonstrate that for the situation of blended acquisition, meaning that different sources are shooting in a time‐overlapping fashion, multiples can be used to ‘deblend’ the seismic measurements. We utilize the recently introduced estimation of primaries by sparse inversion (EPSI) methodology, in which the primary impulse responses are considered to be the unknowns in a large‐scale inversion process. With some modifications the estimation of primaries by sparse inversion method can be used for blended seismic data. As output this process gives unblended primary impulse responses with point sources and receivers at the surface, which can be used directly in traditional imaging schemes. It turns out that extra information is needed to improve on the deblending of events that do not have much associated multiple energy in the data, such as steep events at large offsets. We demonstrate that this information can be brought in during acquisition and during processing. The methodology is illustrated on 2D synthetic data. |
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| Keywords: | Deblending Primaries Multiples Sparse inversion |
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