Imaging improvement by prestack signal enhancement

Buzlukov, Vadim; Landa, Evgeny

doi:10.1111/1365-2478.12047

Cited by 28 publications

(5 citation statements)

References 11 publications

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“…Also, MF can be considered as a method for wavefield analysis, which reliably estimates wavefront parameters of each seismic event at each imaging point (Hubral, 1983; Landa et al., 1999). These attributes have broad applications in seismic imaging and interpretation (Berkovitch et al., 2012; Buzlukov & Landa, 2013; Chang, Hu, et al., 2019; Elhaj et al., 2014; Landa et al., 2009, 2013; Schoepp et al., 2015).…”

Section: Review Of Multifocusing Methodsmentioning

confidence: 99%

High‐resolution 2.5D multifocusing imaging of a crooked seismic profile in a crystalline rock environment: Results from the Larder Lake area, Ontario, Canada

Fam

Naghizadeh

Smith

et al. 2022

Geophysical Prospecting

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A high‐resolution seismic reflection transect was acquired over a hard‐rock geological setting along an existing roadway in the Larder Lake area of the Superior Craton of Canada for the Metal Earth project in 2017. This profile, as well as other Metal earth transects, primarily aims to enhance the knowledge and to better understand the subsurface geology of the Abitibi Greenstone Belt within the Canadian Shield. The complex geological settings of the study area as well as the tribulations caused by the survey geometry have made the imaging and velocity field estimation more challenging. A recently introduced 2.5D multifocusing stacking method is one potential solution for processing crooked‐line seismic data with a poor signal‐to‐noise ratio. The 2.5D multifocusing approach offers more realistic modelling of the zero‐offset wavefield by explicitly accounting for the midpoint dispersion and cross‐dip effects. The main practical problem of the 2.5D multifocusing implementation is the simultaneous determination of the optimal wavefield parameters for each image point and time location. We address this optimization problem using a multidimensional constrained differential evolution global optimization algorithm, as this improves the efficiency and accuracy of the estimation. We have also designed an efficient processing sequence for multifocusing seismic imaging. The performance of the 2.5D multifocusing procedure has been examined on a synthetic model, generated using the same real acquisition geometry. Numerical tests demonstrate that the 2.5D multifocusing technique can produce a more focused stack with the primary reflections appearing at their poststack correct locations, and the procedure can also provide reliable estimates of interface dips. Due to the importance and difficulty of imaging the data, several conventional and advanced processing strategies have been attempted on the transect, specifically: 2D phase‐shift time migration of a dip moveout corrected stack; 2D prestack Kirchhoff time migration; swath 3D poststack migration; and our 2.5D multifocusing imaging algorithm. We found that applying the 2.5D multifocusing stacking algorithm followed by a poststack time migration approach improved the resolution of the image significantly compared to all the conventional and advanced methods and identified new reflections. The 2.5D multifocusing method also focused the steeply dipping reflections more coherently, which resolved ambiguities in geological architecture by understanding the location and continuity of structures. The method also accurately extracts 3D structural information and results in an improved signal‐to‐noise ratio.

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Section: Review Of Multifocusing Methodsmentioning

confidence: 99%

High‐resolution 2.5D multifocusing imaging of a crooked seismic profile in a crystalline rock environment: Results from the Larder Lake area, Ontario, Canada

Fam

Naghizadeh

Smith

et al. 2022

Geophysical Prospecting

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“…A more sophisticated approach called nonlinear beam forming (NLBF) is based on estimation of actual local moveout directly from the data followed by stacking along estimated trajectories . NLBF consists of two steps: estimation of the unknown coefficients (prestack kinematic attributes) using semblance optimization and weighted summation of seismic events along the estimated surfaces similar to CRS or multifocusing techniques (Baykulov and Gajewski, 2009;Berkovitch et al, 2011;Buzlukov and Landa, 2013). In this study we demonstrate supergrouping and nonlinear beamforming on synthetic and challenging land seismic data from the Saudi Arabia.…”

Section: Introductionmentioning

confidence: 90%

Enhancing Challenging Prestack Data Using Local Summation Approaches

Dmitriev¹,

Bakulin²,

Silvestrov³

et al. 2018

Proceedings

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For high-channel count and single-sensor seismic data many processing steps requiring estimation of prestack parameters become more challenging due to the low signal-to-noise ratio of the data. Conventional processing algorithms involve estimation of velocities, statics and surface consistent scalars and operators, and need good prestack data quality, which is rarely the case for land seismic data acquired in arid desert environments of Saudi Arabia with a complex near surface. We present two methods for prestack seismic signal enhancement based on mixing neighboring traces. The first method called supergrouping performs local summation of traces using a global normal moveout correction to align reflected signal. The second approach, called nonlinear beamforming (NLBF), is a data-driven procedure to estimate local moveout directly from the data. We demonstrate the signal enhancement ability of these procedures on synthetic and challenging land seismic data from Saudi Arabia.

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“…Imaging structural complexities in the near surface (top 1 km) of the Carosue Basin are of critical importance for exploration and, consequently, time imaging has to be replaced by depth imaging techniques to accommodate for the lateral velocity variations of the subsurface (Buzlukov & Landa, 2013). Lateral velocity variations are often associated with complex geology and the depth migration algorithm has the ability to accommodate such features, including steep dips (Yilmaz, 2001).…”

Section: Seismic Data Imagingmentioning

confidence: 99%

Pre‐stack depth imaging techniques for the delineation of the Carosue Dam gold deposit, Western Australia

Ziramov

Young²,

Kinkela³

et al. 2023

Geophysical Prospecting

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In this study, we explore the latest generation of seismic imaging algorithms (migration) that have been successful in the oil and gas exploration industry and apply them in the more challenging hard rock environment. Seismic migration is a crucial processing step required to build an accurate image of the Earth's subsurface. The seismic method applied in a hard rock environment has a specific set of challenges: complex geological settings often comprised of steeply dipping interfaces and heterogeneities (faults, fracture zones, thrusts, etc.); spatially variable zones of alteration, low intrinsic signal‐to‐noise ratio; complex near‐surface conditions (the weathered overburden has a very high contrast in seismic properties with base formations). Here, we present how a dense source–receiver 3D grid in combination with the latest pre‐stack depth imaging techniques can image the geology with a remarkable level of detail and to depths as shallow as the top of fresh rock. We also propose a comprehensive velocity model building strategy applied specifically to the Carosue Dam deposit, Western Australia, which is mainly characterized by volcaniclastic and volcanic rocks within the Carosue Basin disrupted by a complex system of gold‐bearing faults. To arrive at an optimized velocity model for pre‐stack depth imaging, we combine drillhole data with tomographic refinement. Excellent correlation between resultant seismic images and refraction tomography, vertical seismic profiling and drillholes can be attributed to the integrated velocity model building workflow used for depth migration.

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Imaging improvement by prestack signal enhancement

Cited by 28 publications

References 11 publications

High‐resolution 2.5D multifocusing imaging of a crooked seismic profile in a crystalline rock environment: Results from the Larder Lake area, Ontario, Canada

High‐resolution 2.5D multifocusing imaging of a crooked seismic profile in a crystalline rock environment: Results from the Larder Lake area, Ontario, Canada

Enhancing Challenging Prestack Data Using Local Summation Approaches

Pre‐stack depth imaging techniques for the delineation of the Carosue Dam gold deposit, Western Australia

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