Multi-datum based estimation of near-surface full-waveform redatuming operators

Vrolijk, Jan-Willem; Haffinger, P.; Verschuur, Eric

doi:10.1016/j.jappgeo.2012.02.004

Cited by 5 publications

(4 citation statements)

References 24 publications

(25 reference statements)

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“…In this new model in Figure 1(b), it is difficult to identify inner boundaries among the LVL and highvelocity layers. Indeed, further analysis and inversion are required to meet surface-consistent assumptions on vertical raypaths in LVL, that is, corrections of every source/receiver are static or fixed (Dai and Zhang, 2000;Al-Ali and Verschuur, 2006;Vrolijk et al, 2012). The raypaths through the LVL to the permafrost possibly bend away from the vertical if the velocity of the permafrost is not high enough (Yilmaz, 2001).…”

Section: Petrophysical Characteristics Of Permafrostmentioning

confidence: 99%

“…Thus, the function of Z(x) also deviates from the real model. According to the intermediate reference datum method (Dai and Zhang, 2000;Li et al, 2005;Roberto, 2011;Vrolijk et al, 2012), a smooth surface (black dashed line) for computing static corrections can be determined between the high-velocity layer (brown solid line) and the permafrost (red dashed line). The smooth surface, as the upper boundary of a new high-velocity layer, will locate above the permafrost if…”

Section: Key Factors In Long-wavelength Tomostatics On Common Source ...mentioning

confidence: 99%

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An integrated long‐wavelength statics method applied to seismic processing of Tibetan permafrost

Liu

Feng

et al. 2022

Near Surface Geophysics

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Permafrost in high‐altitude regions complicates near‐surface modelling and exacerbates static effects during seismic processing and interpretation, especially in the form of long‐wavelength issues in cases where it extends laterally beyond the length of the seismic wavelength. The long‐wavelength component of static corrections (statics) for permafrost when solved using a single conventional method is prone to seismic imaging artefacts due to limited field layouts and unmet preconditions. The nonlinearity between the velocities and the thickness from low‐velocity near surface to high‐velocity bedrocks ulteriorly complicates near‐surface modelling for long‐wavelength statics by first‐arrival inversion. Combining the advantages of as much long‐wavelength characteristics as possible associated with the permafrost and rugged topography, we estimate an integrated long‐wavelength statics method including tomographic inversion and refraction residual statics. The integrated method can approximate linearized near‐surface modelling through multi‐step processing. An example from the Qiangtang Basin (central Qinghai–Tibet Plateau) suggests that the integrated method is capable of gradual refining complex near‐surface modelling and long‐wavelength statics and eliminates upward‐stretching abnormalities caused by Tibetan permafrost.

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Section: Petrophysical Characteristics Of Permafrostmentioning

confidence: 99%

Section: Key Factors In Long-wavelength Tomostatics On Common Source ...mentioning

confidence: 99%

An integrated long‐wavelength statics method applied to seismic processing of Tibetan permafrost

Liu

Feng

et al. 2022

Near Surface Geophysics

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“…Several methods have been proposed to recover refracted signals by changing the plane of the acquisition geometry (e.g. Schuster and Zhou, 2006;Vrolijk et al, 2012;Wapenaar et al, 2014;Cho et al, 2016). The goal of wave equation datuming and, particularly, of DC, is to extrapolate the recorded data to a virtual datum surface so that refractions can be retrieved as first arrivals.…”

Section: Wave Equation Datuming (Downward Continuation)mentioning

confidence: 99%

Full-waveform inversion of short-offset, band-limited seismic data in the Alboran Basin (SE Iberia)

et al. 2019

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Abstract. We present a high-resolution P-wave velocity model of the sedimentary cover and the uppermost basement to ∼3 km depth obtained by full-waveform inversion of multichannel seismic data acquired with a 6 km long streamer in the Alboran Sea (SE Iberia). The inherent non-linearity of the method, especially for short-offset, band-limited seismic data as this one, is circumvented by applying a data processing or modelling sequence consisting of three steps: (1) data re-datuming by back-propagation of the recorded seismograms to the seafloor; (2) joint refraction and reflection travel-time tomography combining the original and the re-datumed shot gathers; and (3) full-waveform inversion of the original shot gathers using the model obtained by travel-time tomography as initial reference. The final velocity model shows a number of geological structures that cannot be identified in the travel-time tomography models or easily interpreted from seismic reflection images alone. A sharp strong velocity contrast accurately defines the geometry of the top of the basement. Several low-velocity zones that may correspond to the abrupt velocity change across steeply dipping normal faults are observed at the flanks of the basin. A 200–300 m thick, high-velocity layer embedded within lower-velocity sediment may correspond to evaporites deposited during the Messinian crisis. The results confirm that the combination of data re-datuming and joint refraction and reflection travel-time inversion provides reference models that are accurate enough to apply full-waveform inversion to relatively short offset streamer data in deep-water settings starting at a field-data standard low-frequency content of 6 Hz.

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“…2b). Several methods have been proposed to modify the recordings by changing the plane of the acquisition geometry (e.g., Schuster and Zhou, 2006;Vrolijk et al, 2012;Wapenaar et al, 2014;Cho et al, 2016). The goal of Wave Equation Datuming and, particularly, of DC, is to extrapolate the recorded data to a virtual datum surface so that refractions can be retrieved as first arrivals.…”

Section: Wave Equation Datuming (Downward Continuation)mentioning

confidence: 99%

Full waveform inversion of short-offset, band-limited seismic data inthe Alboran basin (SE Iberia)

Gras¹,

Sallarès²,

Dagnino³

et al. 2019

Preprint

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Abstract. We present a high-resolution P-wave velocity model of the sedimentary cover and the uppermost basement until ~ 3 km depth obtained by full-waveform inversion of multichannel seismic data acquired with a 6 km-long streamer in the Alboran Sea (SE Iberia). The inherent non-linearity of the method, especially for short-offset, band-limited seismic data as this one, is circumvented by applying a data processing/modeling sequence consisting of three steps: (1) data re-datuming by back-propagation of the recorded seismograms to the seafloor; (2) joint refraction and reflection travel-time tomography combining the original and the re-datumed shot gathers; and (3) FWI of the original shot gathers using the model obtained by travel-time tomography as initial reference. The final velocity model shows a number of geological structures that cannot be identified in the travel-time tomography models or easily interpreted from seismic reflection images alone. A sharp strong velocity contrast accurately defines the geometry of the top of the basement. Several low-velocity zones that may correspond to the abrupt velocity change across steeply dipping normal faults are observed at the flanks of the basin. A 200–300 m thick, high-velocity layer embedded within lower velocity sediment may correspond to evaporites deposited during the Messinian crisis. The results confirm that the combination of data re-datuming and joint refraction and reflection travel-time inversion provides reference models that are accurate enough to apply full-waveform inversion to relatively short offset streamer data in deep water settings starting at field-data standard low frequency content of 6 Hz.

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Multi-datum based estimation of near-surface full-waveform redatuming operators

Cited by 5 publications

References 24 publications

An integrated long‐wavelength statics method applied to seismic processing of Tibetan permafrost

An integrated long‐wavelength statics method applied to seismic processing of Tibetan permafrost

Full-waveform inversion of short-offset, band-limited seismic data in the Alboran Basin (SE Iberia)

Full waveform inversion of short-offset, band-limited seismic data inthe Alboran basin (SE Iberia)

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