Removal of Doppler effects from marine vibrator OBN seismic

Chen, Qi; Hilterman, Fred

doi:10.1190/segam2016-13873434.1

Cited by 7 publications

(19 citation statements)

References 7 publications

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“…If we ignore the shot sampling issue and no interpolation is done in equation 4 (reducing S to a simple identity operator), we obtain Figure 3c, where strong aliasing artifacts are present (Figure 3d shows the difference between Figure 3c and Figure 3b). Similar effects have been reported by Qi and Hilterman (2016). Note that the phase of events with the fastest apparent velocities matches those from the "ideal" answer, while it does not for the slowest ones where the Doppler effect is the strongest.…”

Section: Deconvolution/interpolation For Aliasing Mitigationsupporting

confidence: 83%

“…We call C1D the convolution operator with the 1D sweep. As shown by Qi and Hilterman (2016), the simple correlation of the 1D sweep with the recorded NIMS data generates phase errors, due to the Doppler effect, that need to corrected for. In theory, the correlation of the 2D sweep with the recorded data should yield phase-corrected traces.…”

Section: Deconvolution/interpolation For Aliasing Mitigationmentioning

confidence: 99%

“…Several authors (Dragoset, 1988;Hampson and Jakubowicz 1995;Qi and Hilterman, 2016;Asgedom et al, 2019) have studied the Doppler effect associated with nonimpulsive moving sources (NIMS) and proposed methods to correct for it. In this paper we consider a 2D OBN acquisition geometry where only the source displacement must be accounted for.…”

Section: Introductionmentioning

confidence: 99%

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Processing of Non-Impulsive Moving Sources data for structural and 4D imaging: illustrations on SEAM models

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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Marine vibrator sources offer many advantages for seismic acquisitions compared to classical airguns (Laws et al, 2019). The first advantage is a reduced environmental footprint, emitting only the required frequencies together with a significant reduction of the instantaneous peak energy due to an increased emission time. It can also emit very repeatable and specially tailored signals to favor specific frequency bands. One specificity of marine vibrators is that they emit for few seconds while the source vessel is in motion, which results in recorded data affected by the Doppler effect. The Doppler effect is a function of both the boat speed and the apparent velocity of the seismic events. We investigate pre-processing steps to mitigate the Doppler effect and analyze its impact for 3D and 4D imaging.

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Section: Deconvolution/interpolation For Aliasing Mitigationsupporting

confidence: 83%

Section: Deconvolution/interpolation For Aliasing Mitigationmentioning

confidence: 99%

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Processing of Non-Impulsive Moving Sources data for structural and 4D imaging: illustrations on SEAM models

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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“…As in Dragoset (1988), Qi and Hilterman (2016) and Secker (2022), the Doppler-shift-induced phase dispersion is derived by comparing the phase of the two scenarios: (1) data collected with a moving source and subsequently affected by source motion ( 12) and (2) data collected with a stationary source and hence, unaffected by source motion (13). So that the received signal from the stationary source, 𝑟 s , may be compared to that of the received signal from the moving source, 𝑟 m , a time alignment of 𝑟 s to 𝑟 m is performed yielding…”

Section: Theory Of the Doppler-shift-induced Phase Dispersion From So...mentioning

confidence: 99%

“…where 𝜈 0 and 𝜈 1 refer to the starting and ending frequency of the linear sweep and 𝑇 to the period of the sweep. The same equation as in Qi and Hilterman (2016), is obtained by rearranging (18) for 𝑡 and then substituting into (17) thus yielding (19),…”

Section: Theory Of the Doppler-shift-induced Phase Dispersion From So...mentioning

confidence: 99%

Marine vibrator source motion correction for strictly monotonic sweeps

Secker,

Mascomere,

Robin

2024

Geophysical Prospecting

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Marine vibrators represent an alternative seismic source technology that could come to market in the near future. A key challenge related to marine vibrator seismic data is the effect that phase dispersion from source motion has on the signal during transmission. As such, the recorded moving vibrator data will benefit from being phase corrected, so that the data appear as if they had been shot with a stationary source. This transformation is called the source motion correction. Previous source motion corrections used either specific dephasing operators for specific sweep types or pre‐correlation methods for any sweep type. A source motion correction dephasing operator has been derived, demonstrated and applied to real seismic data collected during a Marine Vibrator Joint Industry Project field trial of an array of marine vibrators. This dephasing operator has been made more general so that any strictly monotonic sweep through time may be used for this correction regardless of sweep type (e.g. linear or exponential). Moreover, the correction uses the pilot sweep as a direct input, measuring from it, the instantaneous frequency which can then be used to build the dephasing operator. This new more general form brings two key advantages over previous dephasing operator corrections: (1) Non‐analytically defined sweeps can now be source motion corrected, and (2) even when an analytically defined sweep (e.g. linear) is used, the transmitted sweep from the marine vibrator can vary from the theoretical input sweep; this correction can account for these changes. Furthermore, given that this source motion correction is a dephasing operator, it can be applied pre‐ or post‐correlation of the raw data with the pilot sweep, thus allowing greater flexibility in the processing. Lastly, some previously derived source motion corrections based on dephasing operators contained errors in their derivation; this new derivation addresses these errors resulting in an improved correction.

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