Examinando por Autor "Paniagua, Juan Guillermo"

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    Ítem
    Attenuation of reverse time migration artifacts using Laguerre-Gauss filtering
    (European Association of Geoscientists and Engineers, EAGE, 2017-06-12) Paniagua, Juan Guillermo; Lucia Quintero M, O.; Paniagua, Juan Guillermo; Lucia Quintero M, O.; Universidad EAFIT. Departamento de Ciencias; Modelado Matemático
    Low-frequency artifacts appear in seismic images obtained by reverse time migration with the zero-lag crosscorrelation imaging condition due to the unwanted correlation of diving waves, head waves and backscattered waves. These artifacts can hide important details in the image and different methods have been proposed to attenuate or reduce them. The Laplacian filtering is the common post-processing technique to reduce the artifacts, but it increases the high-frequency noise in the image. Paniagua and Sierra-Sosa (2016) proposed the use of the Laguerre-Gauss spatial filtering (LGSF) to reduce the artifacts and enhance subsurface structures in the seismic image.\\ In this work, we describe the performance of the LGSF and demonstrate the good behavior of this postprocessing technique through synthetic examples. We used the original and different smoothed velocity models to show the capabilities of the LGSF and the results obtained in presence of small changes in the images. We demonstrate that despite the smoothed velocity models the LGSF preserves well the reflections with their true locations and significantly attenuates the low-frequency noise.
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    Ítem
    The continuous wavelet transform in the extraction of information from wavefields
    (Sociedade Brasileira de Geofisica, 2019-08-19) Montoya O.L.Q.; Paniagua, Juan Guillermo; Universidad EAFIT. Escuela de Ciencias; Modelado Matemático
    Artifacts in reverse time migration (RTM) are low spatial frequency noise that appears due to the undesired correlation of head waves