Removing rugged‐topography scattering effects in surface seismic data

Yun, Yun; Wu, Ru hyphen; Shan, Shan; Guan, Humin

doi:10.1190/1.1821050

Cited by 8 publications

(3 citation statements)

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“…In order to overcome the back-scattered noise and to follow-up on some recent papers (Ernst et al, 2002;Guan et al, 2000;Fu et al, 1999), an alternative strategy is hereby introduced for the elimination or attenu-ation of noise events. Such events are estimated via modeling, by means of a solution for finite elements of the acoustic wave equation and further elimination by data subtraction.…”

Section: Introductionmentioning

confidence: 99%

06/02038 Attenuation of the seismic dispersion associated to foothills topography: application to real data

Montes

Quintana

Céspedes

et al. 2006

Fuel and Energy Abstracts

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L and seismic data is contaminated commonly with coherent and high amplitude back-scattered noise generated from roughness in the surface topography; these events make generally the key information on deeper layers unclear. In Colombian foothill areas with rough topography and high lateral velocity variation, this noise has been difficult to attenuate. Conventional methods aimed at this purpose usually yield unsatisfactory results. We present a strategy based in prediction and subtraction of the unwanted waves. Assuming knowledge of the source wavelet and the shallow velocity model we use a finite-element solution of the acoustic wave equation to model the back-scattered noise; this modeled response is then subtracted from the prestack data, resulting in a noticeable attenuation of noise in field seismograms. The method was applied to prestack real data from colombian foothills in order to observe the enhancement in seismic records, planning in a close future to show results on stacked data. Comúnmente, los datos sísmicos adquiridos en tierra están contaminados por ruido coherente y dispersivo de gran amplitud generado a partir de las rugosidades de la topografía, que opaca la información proveniente de las capas más profundas. En las zonas de piedemonte en Colombia, con topografía agreste y alta variación lateral de velocidad, este ruido ha sido difícil de atenuar. Los métodos convencionales para atacar este tipo de problemas usualmente dan resultados poco satisfactorios. Con el propósito de contribuir a la solución del problema, presentamos una estrategia basada en la predicción y remoción de las ondas no deseadas. Conocidos la ondícula de la fuente y el modelo de velocidad de las capas someras, se simula el comportamiento de la onda acústica mediante un algoritmo en elementos finitos para reproducir la respuesta de estas capas. Posteriormente, sustraemos tal respuesta de los datos preapilados, obteniendo una atenuación sustancial del ruido en los registros de campo. El método se aplicó a datos preapilados del piedemonte colombiano a fin de observar una mejoría de la imagen en los registros sísmicos, planeando en un futuro cercano mostrar resultados en secciones apiladas.

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Section: Introductionmentioning

confidence: 99%

06/02038 Attenuation of the seismic dispersion associated to foothills topography: application to real data

Montes

Quintana

Céspedes

et al. 2006

Fuel and Energy Abstracts

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“…Fortunately some approaches have been developed to attenuate the effect of the rugged surface. Fu, L.(1999) gave a method to remove rugged-topography scattering effects in surface seismic data. Wiggins, S. M. etc (1997) discussed the topography effect in tomographic inversion .…”

Section: Introductionmentioning

confidence: 99%

2‐D finite element acoustic wave modeling including rugged topography

Ke¹,

Zhao²,

Cai³

et al. 2001

SEG Technical Program Expanded Abstracts 2001

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The problems induced by rugged topography in seismic data processing has attracted geophysicist's more and more attention in recent years. Some approaches about the S/N ratio, static correction, wave-equation datuming , stack and migration have achieved in order to attenuate the effect of the rugged surface. But there are still some problems needed to be further researched, such as seismic numerical modeling. By the means of seismic numerical modeling, we can investigate the wave generation and propagation in detail and obtain numerical seismic gathers or section for validation of seismic data processing and seismic data interpretation. In this paper, we employ the finite element method based on hybrid element technique and develop a boundary condition and a corner condition to simulate the acoustic wave propagation numerically. The hybrid element technique uses both of the triangular and rectangular elements to dissect the computational area with rugged surface and extend the mass and stiffness matrices of triangular element to those of rectangular element in form for computational unity. In order to eliminate the boundary reflection on the boundary and at corner better, we introduce a boundary condition which contains a parameter, the incident angle, and develop a corner condition which considers both of the up or down going wave and left or right going wave. Very encouraging results have been obtained on theoretical and real models .

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“…Recent approaches have been considered to tackle this problem (Ernst et al, 2002;Guan et al, 2000;Fu et al, 1999;Campman et al, 2003), a strategy in the same direction was presented before, getting appreciable noise attenuation on shots (Montes et al, 2003). The main goal is to predict and subtract the noise from contaminated data, the back-scattered noise prediction is accomplished in a wave theoretical fashion by finite-element, acoustic wave-equation modeling.…”

Section: Introductionmentioning

confidence: 99%

Modeling and removal of back‐scattered noise from rough topography in land seismic data

Montes¹,

Pérez²

2003

SEG Technical Program Expanded Abstracts 2003

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The seismic records of Colombian foothills are usually noisy and contaminated by coherent and high amplitude back-scattered associated with roughness topography, which obscure reflectors from deeper layers. To remove this back-scattered noise, filters have been applied getting satisfactory results for smooth topography and short offsets, but in general conventional methods yield unsatisfactory results. We applied an approach based in prediction and subtraction of the unwanted noise to attenuate it.The extracted source signature of each record and the shallow velocity model were input to the finite element software to model the acoustic wave equation, obtaining the back-scattered noise in each record. Each output was subtracted from its corresponding record, attenuating noticeably the noise. The procedure was applied in the shots records of a foothill seismic line providing an improved image of the stacked section after time processing. The software had been previously tested on synthetic data giving promising results. 70 Los registros del área del piedemonte colombiano están generalmente contaminados con ruido de gran amplitud asociado a la topografía, que oscurecen los reflectores de interés. Este ruido se intenta eliminar mediante filtros, lo cual funciona para topografía suave y offsets más cercanos, pero en general los métodos convencionales suministran resultados desalentadores. Hemos aplicado un método basado en la predicción y sustracción de este ruido con el fin de atenuarlo.La ondícula extraída de cada registro y el modelo de la capa somera, son alimentados a un programa hecho en elementos finitos que modela el comportamiento de la onda acústica y suministra la respuesta de la capa somera. Cada salida se sustrae de su correspondiente registro de donde se extrajo la ondícula, logrando un registro y una atenuación notable en él.Este procedimiento se aplicó a una línea sísmica de piedemonte, obteniéndose una mejor imagen de la sección apilada. El programa había sido previamente probado en datos sintéticos suministrando resultados promisorios.

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Removing rugged‐topography scattering effects in surface seismic data

Cited by 8 publications

References 0 publications

06/02038 Attenuation of the seismic dispersion associated to foothills topography: application to real data

06/02038 Attenuation of the seismic dispersion associated to foothills topography: application to real data

2‐D finite element acoustic wave modeling including rugged topography

Modeling and removal of back‐scattered noise from rough topography in land seismic data

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