Flooding the topography: Wave‐equation datuming of land data with rugged acquisition topography

Bevc, Dimitri

doi:10.1190/1.1885634

Cited by 29 publications

(33 citation statements)

References 6 publications

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“…Berryhill (1979Berryhill ( , 1984 fi rst presented the concept of wave equation datuming. Yilmaz and Lucas (1986), Schneidier et al (1995), Bevc (1997), and Yang et al (1999) also made many useful attempts on the technique of wave equation datuming. Other methods, such as the "zero-velocity layer" method (presented by Beasley and Lynn;1992).…”

Section: Introductionmentioning

confidence: 96%

Prestack Gaussian beam depth migration under complex surface conditions

Yue

Zhang³

et al. 2010

Appl. Geophys.

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In areas with a complex surface, the acquisition and processing of seismic data is a great challenge. Although elevation-static corrections can be used to eliminate the infl uences of topography, the distortions of seismic wavefields caused by simple vertical time shifts still greatly degrade the quality of the migrated images. Ray-based migration methods which can extrapolate and image the wavefi elds directly from the rugged topography are effi cient ways to solve the problems mentioned above. In this paper, we carry out a study of prestack Gaussian beam depth migration under complex surface conditions. We modify the slant stack formula in order to contain the information of surface elevations and get an improved method with more accuracy by compositing local plane-wave components directly from the complex surface. First, we introduce the basic rules and computational procedures of conventional Gaussian beam migration. Then, we give the original method of Gaussian beam migration under complex surface conditions and an improved method in this paper. Finally, we validate the effectiveness of the improved method with trials of model and real data.

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Section: Introductionmentioning

confidence: 96%

Prestack Gaussian beam depth migration under complex surface conditions

Yue

Zhang³

et al. 2010

Appl. Geophys.

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“…Wavefield continuation is a better solution for complex near surface static problems. However, conventional wavefield continuation is based on a flat surface and isn't suitable for rough topography situations (Shtivelman andCanning, 1988: Yilmaz andLucas, 1986;Schneider et al, 1995;Bevc, 1997).…”

Section: Introductionmentioning

confidence: 99%

Wavefield continuation datuming using a near surface model

Cui

et al. 2007

Appl. Geophys.

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When topography and low velocity zone differences vary greatly, conventional vertical static time shifts will cause wavefield distortion and influence wave equation seismic imaging for seismic data acquired on a complex near surface. In this paper, we propose an approach to datum correction that combines a joint tomography inversion with wavefield continuation to solve the static problem for seismic data on rugged acquisition topography. First, the near surface model is obtained by refracted wave tomography inversion. Second, the wavefield of sources and receivers are continued downward and upward to accomplish datum correction starting from a flat surface and locating the datum above topography. Based on the reciprocal theorem, Huygens' and Fresnel principles, the location of sources and receivers, and regarding the recorded data on the surface as a secondary emission, the sources and receivers are upward-continued to the datum above topography respectively. Thus, the datum correction using joint tomography inversion and wavefield continuation with the condition of a complex near surface is accomplished.

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“…Rough topography is very common, and we have to deal with it during the acquisition, processing and interpretation of seismic data (Neuberg and Pointer 2000;Bean et al 2008;Lan and Zhang 2011;Lan et al 2012;Bevc 2012). How to accurately describe the geological model with undulating interfaces is very important for solving the seismic wave propagation.…”

Section: Introductionmentioning

confidence: 99%

Ray tracing of turning wave in elliptically anisotropic media with an irregular surface

Zhang

Bai

et al. 2017

Earthq Sci

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Seismic ray tracing in anisotropic media with irregular surface is crucial for the exploration of the fine crustal structure. Elliptically anisotropic medium is the type of anisotropic media with only four independent elastic parameters. Usually, this medium can be described by only the vertical phase velocity and the horizontal phase velocity for seismic wave propagation. Model parameterization in this study is described by flexible triangular grids, which is beneficial for the description of irregular surface with high degree of approximation. Both the vertical and horizontal phase velocities are defined in the triangular grids, respectively, which are used for the description of phase velocity distribution everywhere in the model by linear interpolation. We develop a shooting ray tracing method of turning wave in the elliptically anisotropic media with irregular surface. Runge-Kutta method is applied to solve the partial differential equation of seismic ray in elliptically anisotropic media. Linearly modified method is used for adjusting emergent phase angles in the shooting scheme. Numerical tests demonstrate that ray paths coincide well with analytical trajectories in transversely homogeneous elliptically anisotropic media. Seismic ray tracing results in transversely inhomogeneous elliptically anisotropic media demonstrate that our method is effective for further first-arrival tomography in elliptically anisotropic media with an irregular surface.

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Flooding the topography: Wave‐equation datuming of land data with rugged acquisition topography

Cited by 29 publications

References 6 publications

Prestack Gaussian beam depth migration under complex surface conditions

Prestack Gaussian beam depth migration under complex surface conditions

Wavefield continuation datuming using a near surface model

Ray tracing of turning wave in elliptically anisotropic media with an irregular surface

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