High-efficiency and precision VSP wavefield separation method via DCT
نویسندگان
چکیده
Abstract The processing efficiency of the widely used time-space (t-x) domain vertical seismic profiling (VSP) wavefield separation methods (such as median and singular value decomposition filtering) via one-dimensional discrete Fourier transform (DFT) depends on method (or algorithm with parameter) total number samples in input VSP data. Once is determined, its set cannot be optimized. Although popular frequency-wavenumber (f-k) two-dimensional DFT has higher than t-x methods, precision susceptible to spatial alias Gibbs effects. For improvements, we introduced cosine (DCT) operation into for first time, proposed a high-efficiency frequency-space (f-x) DCT, which can optimized using effective bandwidth cutoff frequency Based relationship between combined their operations one step (referred DCT–DFT) further enhancement, thereby designing f-x DCT–DFT. Theory analysis synthetic field data examples show that highly efficient precise, three-dimensional (3D)-VSP separation, especially large distributed acoustic sensing (DAS)-VSP
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ژورنال
عنوان ژورنال: Journal of Geophysics and Engineering
سال: 2022
ISSN: ['1742-2140', '1742-2132']
DOI: https://doi.org/10.1093/jge/gxac010