A method for converted wave receiver statics correction in the CRG domain

Guevara, Saul E.; Margrave, Gary F.; Isaac, Helen

doi:10.1190/segam2015-5906814.1

Cited by 4 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first one requires a known shear velocity model, usually obtained by direct measurements (borehole data, refraction, Rayleigh wave inversion). The second one assumes a surface consistent model, as in the statics correction methods available for acoustic wave processing (Guevara et al, 2015). However, the surface consistent assumption is not always valid, and, in the case of PS-CW, it causes error during processing.…”

Section: Introductionmentioning

confidence: 99%

A raypath-consistent receiver correction in PS converted wave processing through seismic interferometry: New application for tropical zones

Salamanca

2019

Universitas Scientiarum

View full text Add to dashboard Cite

The estimation of static corrections is an issue still unsolved for PS converted wave processing. Due to the PS converted wave usually arriving at the surface at non-zero angles, the surface consistent approach is no longer valid, and corrections become non-stationary, i.e. the correction is not static. Seismic interferometry is used in receiver gathers transformed to the radial domain to estimate functions that contain the delay caused by the weathered layer, considering the emergence angle of the PS converted wave. Inverse filters, derived from these functions, are applied by convolution to the raw traces to supply traces corrected for weathering layer effects. Seismic interferometry was satisfactorily tested in two synthetic models and then applied to a 2C seismic line from the Llanos Basin (Colombia). This is the first application of the technique in Colombia, initially developed for permafrost zones, with different assumptions and surface complexity; and it resulted in an improved PS converted wave image.

show abstract

Section: Introductionmentioning

confidence: 99%

A raypath-consistent receiver correction in PS converted wave processing through seismic interferometry: New application for tropical zones

Salamanca

2019

Universitas Scientiarum

View full text Add to dashboard Cite

show abstract

“…Arguably more justifiable are approaches which analyse horizon-timing differences on common-receiver-gathers (CRGs) (Cary and Eaton, 1993), or methods using PPS and SSS refractions (Houston et al, 1989;Liu and Wei, 2008). More recent areas of study include a technique based on correlation of adjacent CRGs (Guevara et al, 2015); ray-path interferometry via the radial trace or Tau-p domains (e.g. Henley, 2014;Cova et al, 2015); and inversion of surface-wave dispersion data (e.g.…”

mentioning

confidence: 99%

Resolution enhancement in shallow 3D-PS seismic reflection

Strong¹

View full text Add to dashboard Cite

This thesis aims to advance methodology for acquiring and processing 3D multicomponent seismic data for shallow (< 300 m) exploration targets. The primary focus is to improve seismic resolution, and hence geological interpretation, for coal-scale targets.The coal industry is a significant contributor to the energy security and economy of Australia and the world. Conventional P-wave seismic methods are widely used in this industry, providing economic, safety and environmental benefits. There is potential for expanding these benefits by including multicomponent procedures. In this thesis, the primary focus is on converted-wave (PS) reflection, which is a logical extension to the standard approach. This has theoretical potential to provide extra geological information. It has also been proposed that there may be resolution advantages for shallower targets such as coal.A valuable starting point for understanding resolution in shallow P and PS reflection is via visco-elastic finite-difference simulation. This provides a useful indication of the reflection response of different targets, and can include the influence of different processing flows. For typical coal-scale environments, modelling with reasonable anelasticity assumptions suggests that PS resolution is unlikely to be superior to P resolution, even with idealised acquisition and processing. In real-world situations, achieving good PS resolution may be even more challenging. There are a number of factors across the acquisition and processing flow which incrementally influence resolution.Survey design is intrinsically more complex for PS surveys than for P, primarily because of ray-path asymmetry. In addition, phase and amplitude effects require careful analysis, and finite-difference modelling provides a useful tool. Such modelling suggests that for shallow surveys in particular, it may be possible to incorporate longer relative offsets, compared to the petroleum scale. An examination of bin fold, and offset/azimuth distribution, suggests that the natural bin size of a PS survey is mostly dependent on the receiver spacing, and is generally larger than for P waves. This favours the use of higher receiver densities for multicomponent surveys. These observations can be more important at the shallow scale, again because of greater ray-path asymmetry and potentially higher V P /V S value.One of the most critical steps in the shallow PS processing sequence is correcting for the S-wave receiver statics. Three relatively conventional approaches have been evaluated. A surface-consistent inversion approach has been shown to fail for shallow targets, or in the presence of strong noise. For our 3D data set, PPS refraction analysis provided the preferred solution. In other cases where PPS refractions are poorly defined, our robust statistical approach may be useful for determining short-wavelength statics, although additional long-wavelength control would then be needed.ii In exploration seismology, surface waves are commonly considered to be noise. However, the d...

show abstract

Statics correction methods for 3D converted-wave (PS) seismic reflection

Strong

Hearn

2017

Exploration Geophysics

View full text Add to dashboard Cite

A method for converted wave receiver statics correction in the CRG domain

Cited by 4 publications

References 5 publications

A raypath-consistent receiver correction in PS converted wave processing through seismic interferometry: New application for tropical zones

A raypath-consistent receiver correction in PS converted wave processing through seismic interferometry: New application for tropical zones

Resolution enhancement in shallow 3D-PS seismic reflection

Statics correction methods for 3D converted-wave (PS) seismic reflection

Contact Info

Product

Resources

About