Multiple prediction through inversion: A fully data‐driven concept for surface‐related multiple attenuation

Wang, Yanghua

doi:10.1190/1.1707074

Cited by 28 publications

(4 citation statements)

References 12 publications

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“…As marked in Figure 8a, the most difficult part of multiple attenuation is where the refraction wave just starts appearing. Figure 8b displays the shot record after free surface multiple attenuation, using a multiple prediction through the inversion (MPI) method presented by Wang [2004Wang [ , 2007. The real shot record is generated by a point source, but Figure 8c is an equivalent line source shot gather, after partial compensation as follows.…”

Section: Free Surface Multiple Attenuationmentioning

confidence: 99%

Reflection seismic waveform tomography

Wang¹,

Rao²

2009

J. Geophys. Res.

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110

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[1] In seismic waveform tomography, if using reflection data with limited source-receiver offsets, it is difficult to reconstruct the deep part of the subsurface velocity model. We present two approaches to tackle this problem: layer stripping and weighted updating. In a layer-stripping procedure, we replace the top portion of seismic data with synthetics generated from the previous-layer inversion and make the current inversion focus on the minimization of the data misfit corresponding to the deep part of the model. To improve efficiency, we use only sparsely sampled frequency data in the deeper-layer inversions, unlike the first-layer inversion where we use densely sampled frequency data as usual. The sparsely sampled frequencies together have the full wave number coverage for effective imaging. Combined use of dense and sparse sampling in frequency is a compromise between resolution and efficiency, as it reduces the number of iterations needed in layer-stripping inversion while still producing a good image. In the second scheme, we apply depth-dependent weights to model updates in order to improve the convergence in an iterative solution. The weighting is inversely proportional to the ray density variation along the depth and is mathematically equivalent to the application of an inverse Hessian matrix which sharpens the gradient vector for model updating. For real seismic data, we transfer point source shot records to line source records, by partial amplitude compensation and phase adjusting, before inputting it to the waveform tomography. We perform traveltime inversion to generate a reliable layered velocity model and then waveform tomography to produce a high-resolution image of the subsurface model through frequency domain iteration.

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Section: Free Surface Multiple Attenuationmentioning

confidence: 99%

Reflection seismic waveform tomography

Wang¹,

Rao²

2009

J. Geophys. Res.

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110

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“…Since multiples are undesirable, a large variety of methods has been developed to detect, predict and attenuate them since late 1940s based on the properties of multiples [22,23]. The first property of primaries is that multiples tend to have more moveout than primaries [24,25,26,27]. Secondly, multiples have more curvature than primaries [28,29,25,30,31].…”

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confidence: 99%

Land Seismic Multiples Detection and Attenuation In Bornu-Chad Basin, Nigeria

Umoetok¹,

Uko

Tamunobereton-ari

et al. 2020

Pakistan Journal of Geology

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Three dimensional (3D) seismic survey was acquired and processed in Bornu-Chad basin, Nigeria with the aim of detecting and attenuating multiples to aid proper imaging of the subsurface. The 25.5km2 volume was processed using SeisUp processing software on a 32-Node Cluster Infrastructure (CI) hardware. Considering the imaging objectives and depth of interest of 1.2s-4.5s, the minimum, middle and maximum offsets were set at 500-2300m, 2500-4300m and 4500-7300m respectively. Since the study area comprised of dry open land and swampy Lake Chad, vibroseis and dynamite sources were used respectively. Charge depth was 0m (surface) for vibroseis and 25m dynamite. The dataset was first pre-conditioned, normalized, regularized before application of demultiple process. The detection and demultiple processes based on multiple characteristics of periodicity and velocity discrimination were applied as the multiples have comparable velocity with the primaries. The near-surface reverberations and short-period multiples were attenuated using predictive deconvolution and radon transform algorithms. High resolution radon was performed on post-migrated common-mid-point (CMP) gathers and stacked with 1kmx1km target line velocities. Internal multiples were detected and attenuated using data-driven methodology of extended internal multiple prediction (XIMP). Multiples detected were short, long period and interbed multiples on all frequencies ranges of 0 -90Hz but useful seismic frequency range was between 20Hz and 70Hz. The frequencies and amplitudes of the primaries and multiples were very comparable, therefore great care was taken in the attenuation processes. The results of this work has produced better seismic section for interpretation of subsurface geology in the study area.

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“…Hence, multiple attenuation is a critical step in data pre-processing before waveform tomography ). We use the so-called multiple prediction through inversion (MPI) method (Wang 2004(Wang , 2007 to remove strong multiple reflections, so as to reduce the nonlinearity of the inverse problem, which is defined by data fitting.…”

Section: Physical Modelling Seismic Datamentioning

confidence: 99%

Reflection seismic waveform tomography of physical modelling data

et al. 2016

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Waveform tomography is commonly tested using numerically generated synthetic seismic data, before the method is applied to field seismic data. However, there are often noticeable differences between idealized synthetic data and real field data, and many factors in the field data, such as noise, irregular source/receiver geometry, affect the inversion solutions. For exploring the potential of reflection seismic waveform tomography, we presented a more realistic test than the synthetic data test, by applying it to physical modelling data, to reconstruct a laboratorial model with complex velocity variation. First, we provided a formulation of the perfectly matched layer absorbing boundary condition, associated with the second-order acoustic wave equation, in order to suppress artificial reflections from subsurface model boundaries in seismic waveform simulation and tomography. Then, we demonstrated the successful implementation of a layer-striping inversion scheme applicable to reflection seismic waveform tomography. Finally, we confirmed the effectiveness of frequency grouping, rather than a single frequency at each iteration, a strategy specifically for the frequency-domain waveform tomography.

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Multiple prediction through inversion: A fully data‐driven concept for surface‐related multiple attenuation

Cited by 28 publications

References 12 publications

Reflection seismic waveform tomography

Reflection seismic waveform tomography

Land Seismic Multiples Detection and Attenuation In Bornu-Chad Basin, Nigeria

Reflection seismic waveform tomography of physical modelling data

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