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

Strong, Shaun; Hearn, Steve

doi:10.1071/eg15115

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…The history of seismic refraction data analysis can be traced back to the 1920s [6]. Seismic refraction data analysis tasks include deconvolution [24], dynamic correction [25], static correction [26,27], speed analysis [28], and migration [29]. Picking first arrivals [19] is an important pre-processing stage for these tasks.…”

Section: Related Workmentioning

confidence: 99%

First-Arrival Travel Times Picking through Sliding Windows and Fuzzy C-Means

2019

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First-arrival picking is a critical step in seismic data processing. This paper proposes the first-arrival picking through sliding windows and fuzzy c-means (FPSF) algorithm with two stages. The first stage detects a range using sliding windows on vertical and horizontal directions. The second stage obtains the first-arrival travel times from the range using fuzzy c-means coupled with particle swarm optimization. Results on both noisy and preprocessed field data show that the FPSF algorithm is more accurate than classical methods.

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Section: Related Workmentioning

confidence: 99%

First-Arrival Travel Times Picking through Sliding Windows and Fuzzy C-Means

2019

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“…A number of S-wave statics methods have previously been investigated for this survey (Strong and Hearn, 2016). These include PPS refraction statics, and a statistical method call robust statics which tends to only correct for medium and short wavelength variations.…”

Section: S-wave Velocities and Staticsmentioning

confidence: 99%

Application of Interferometric MASW to a 3D-3C Seismic Survey

Strong

Hearn

2016

ASEG Extended Abstracts

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Multichannel analysis of seismic surface waves (MASW) is well developed for shallow geotechnical applications. The technique has received much less attention in 3D reflection. The primary goal of this investigation is to develop an improved methodology for extracting S-wave receiver statics in 3D converted-wave (PS) reflection surveys. The main challenge of using MASW in this context is the increased receiver spacing. To overcome this we need to include multiple sources in each dispersion analysis. Unfortunately, adding more sources increases the chance that the dispersion image will be degraded due to lateral near-surface variations. We present a methodology which incorporates interferometry into the MASW method (IMASW). This effectively repositions sources at receiver locations, reducing the region over which lateral variations can contribute to the data. Application of this approach to a 3D-3C trial dataset provides an alternate approach for determining the S-wave receiver statics solution for converted-wave reflection surveys.

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“…Chapter 5 described several other S-wave statics methods investigated for this survey (Strong and Hearn, 2016a). These include PPS refraction statics, and a statistical method (referred to as Robust statics) which tends to only correct for medium and short wavelength variations.…”

Section: S-wave Velocities and Staticsmentioning

confidence: 99%

“…The content of this chapter has been published in Exploration Geophysics, (Strong and Hearn, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Resolution enhancement in shallow 3D-PS seismic reflection

Strong¹

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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...

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

Cited by 4 publications

References 18 publications

First-Arrival Travel Times Picking through Sliding Windows and Fuzzy C-Means

First-Arrival Travel Times Picking through Sliding Windows and Fuzzy C-Means

Application of Interferometric MASW to a 3D-3C Seismic Survey

Resolution enhancement in shallow 3D-PS seismic reflection

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