Eigenstructure‐based coherence computations as an aid to 3-D structural and stratigraphic mapping

Gersztenkorn, Adam; Marfurt, Kurt J.

doi:10.1190/1.1444651

Cited by 490 publications

(108 citation statements)

References 6 publications

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“…12 äåìîíñòðèðóåò ìíîaeåñòâî ðàäèàëü-íûõ íàðóøåíèé âîêðóã ñîëÿíîãî øòîêà, õîðî-øî âèäèìûõ íà ãîðèçîíòàëüíîì ñðåçå êóáà êî-ãåðåíòíîñòè ñåéñìè÷åñêîãî èçîáðàaeåíèÿ [Gersztenkorn, Marfurt, 1999]. Êàê ïðàâèëî, âáëèçè ñîëÿíîãî òåëà îíè îðòîãîíàëüíû êîíòóðó äèà-ïèðà.…”

Section: ïðåäñòàâëåíî ÷ëåíîì ðåäêîëëåãèè â í ïèëèïåíêîunclassified

Adequate velocity model as a basis for effective seismic imaging when mapping hydrocarbon traps associated with salt domes

Tiapkina

Tiapkin

Okrepkyj

2017

Geofizicheskiy Zhurnal

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Section: ïðåäñòàâëåíî ÷ëåíîì ðåäêîëëåãèè â í ïèëèïåíêîunclassified

Adequate velocity model as a basis for effective seismic imaging when mapping hydrocarbon traps associated with salt domes

Tiapkina

Tiapkin

Okrepkyj

2017

Geofizicheskiy Zhurnal

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“…For example, Dalley et al (1989), Marfurt and Kirlin (2000), Marfurt (2006), and Perez and Marfurt (2008), respectively, conducted in-depth research on the estimation of apparent dips and, at the same time, provided a measure for the magnitude of changes in reflector dip and azimuth across a discontinuity. Perona et al(1990), Bahorich and Farmer (1995), Luo et al(1996), Gerstzenkorn andMarfurt (1999), Marfurt and Kirlin (2000), AlDossary and Marfurt (2004), Lu et al (2005), AlDossary and Marfurt (2006), and Gulunay et al (2007) developed quantitative estimates of coherence at reflection discontinuities. However, all of these estimates are made from full frequency band seismic data, in which noise reduces the reliability of the estimates due to low signal-to-noise-ratio (SNR).…”

Section: Introductionmentioning

confidence: 97%

Structure-oriented edge-preserving smoothing based on accurate estimation of orientation and edges

Wang

Chen

Xu³

et al. 2009

Appl. Geophys.

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In this paper, we present a new method for reducing seismic noise while preserving structural and stratigraphic discontinuities. Structure-oriented edge-preserving smoothing requires information such as the local orientation and edge of the reflections. The information is usually estimated from seismic data with full frequency bandwidth. When the data has a very low signal to noise ratio (SNR), the noise usually reduces the estimation accuracy. For seismic data with extremely low SNR, the dominant frequency has higher SNR than other frequencies, so it can provide orientation and edge information more reliably than other frequencies. Orientation and edge are usually described in terms of apparent reflection dips and coherence differences, respectively. When frequency changes, both dip and coherence difference change more slowly than the seismogram itself. For this reason, dip and coherence estimated from dominant frequency data can approximately represent those of other frequency data. Ricker wavelet are widely used in seismic modeling. The Marr wavelet has the same shape as Ricker wavelets in both time and frequency domains, so the Marr wavelet transform is selected to divide seismic data into several frequency bands. Reflection apparent dip as well as the edge information can be obtained by scanning the dominant frequency data. This information can be used to selectively smooth the frequency bands (dominant, low, and high frequencies) separately by structure-oriented edge-preserving smoothing technology. The ultimate noise-suppressed seismic data is the combination of the smoothed frequency band data. Application to synthetic and real data shows the method can effectively reduce noise, preserve edges, improve trackable reflection continuity, and maintain useful information in seismic data.

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“…Hence, we compare its performance with a multichannel coherence method, the eigenstructure-based algorithm (Gersztenkorn and Marfurt, 1999). Figure 3b shows a synthetic seismic profile.…”

Section: Fault and Fracture Detectionmentioning

confidence: 99%

Seismic characterization of a carbonate reservoir in Tarim Basin

Liu

Wang

2017

GEOPHYSICS

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Seismic characterization of carbonate reservoirs is a challenging task for geophysicists because of their special depositional environment and complex interior structures. We developed a case study of the seismic characterization of a karstified carbonate reservoir in the Tarim Basin, western China. The characterization procedure is sequential and includes fault and fracture detection, seismic facies classification, seismic impedance inversion, and lithofacies classification. We presented a dipsteered coherence algorithm for detecting faults and karst fractures in the carbonate reservoir. Incorporating the dip information improves the performance and robustness. We applied normalized seismic segments, rather than the amplitude values, as the input to seismic facies classification, so as to reduce the impact of strong amplitudes, such as karst fractures, and to enable the analysis of weak amplitudes in the background strata. For the impedance inversion, we adopted a Fourier integral method for fast simulation in the stochastic inversion in this karstified carbonate reservoir. The algorithm honors the lateral variation based on the seismic trace similarity, instead of the lateral variogram that is commonly used in stochastic inversion. We conducted lithofacies classification, in which we used seismic coherence as a prior knowledge, so as to honor the fracture-associated local lithofacies with dolomitization and to distinguish it from limestone without dolomitization. Based on reservoir characterization described above, we determined three drilling wells for potential oil/gas exploration.

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Eigenstructure‐based coherence computations as an aid to 3-D structural and stratigraphic mapping

Cited by 490 publications

References 6 publications

Adequate velocity model as a basis for effective seismic imaging when mapping hydrocarbon traps associated with salt domes

Adequate velocity model as a basis for effective seismic imaging when mapping hydrocarbon traps associated with salt domes

Structure-oriented edge-preserving smoothing based on accurate estimation of orientation and edges

Seismic characterization of a carbonate reservoir in Tarim Basin

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