Correction to: VSP polarization angles determination: Wysin-1 processing case study

Zaręba, Mateusz; Danek, Tomasz

doi:10.1007/s11600-019-00277-3

Cited by 2 publications

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“…Accuracy of back-azimuth estimation can be enhanced by e.g., signal conditioning or stacking. In the case of the 3C geophones string in a vertical borehole, horizontal components can be stacked in order to increase the efficiency of the back-azimuth estimation by decreasing random interferences and increasing the S/N, providing that orientation correction has been already applied (Klemperer 1987;Zaręba and Danek 2019). Nevertheless, errors in back-azimuth estimation should be statistically analyzed to provide an assessment of azimuth uncertainty (Christoffersson et al 1988).…”

Section: Station-event Back-azimuth Estimationmentioning

confidence: 99%

“…Therefore, to be able to determine the position of registered events of unknown locations, a calibration has to be done beforehand (e.g. Becquey and Dubesset 1990;Zaręba and Danek 2019). In order to determine the tool string rotation, a record of some events with known locations can be used, usually, the perforation shots (Maxwell 2014).…”

Section: Determining the Orientation Of Geophonesmentioning

confidence: 99%

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Untitled

2021

Publs. Inst. Geophys. P.A.S.

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Section: Station-event Back-azimuth Estimationmentioning

confidence: 99%

Section: Determining the Orientation Of Geophonesmentioning

confidence: 99%

Untitled

2021

Publs. Inst. Geophys. P.A.S.

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A Novel Method for Determining Geophone Orientations From Zero-Offset VSP Data Constrained by Scalar Field

Yang

Zhou

et al. 2022

Front. Earth Sci.

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In vertical seismic profile (VSP) acquisition, the orientation of the three-component geophones in a borehole is often not aligned due to random rotation of the wireline receiver array. Knowing the geophone orientation is crucial for rotating the waveforms back to the position where the geophones are assumed to be aligned. This procedure is critical in three-component VSP data processing as it provides the correct wavefields for subsequent VSP data imaging and inversion. For zero-offset or near zero-offset VSP measurements, the direct P-wave propagates nearly vertically, and the horizontal geophones receive only a small fraction of the direct P-wave energy. The first-arrival in the horizontal component data is often of low signal-to-noise ratio (SNR). As a result, it is difficult to apply conventional first-arrival–based methods for obtaining accurate geophone orientations. On the other hand, a seismic event comprising individual waveform would achieve maximum correlation if all corresponding geophones are aligned. The geometric characteristics, that is, the slope and continuity of a seismic event in the vector wavefield are the same with those of the modules of the vector wavefield. The latter, also known as the scalar wavefield, can be used for scanning geophone orientations based on waveform correlation. In this study, we propose to use the scalar field to extract the slope of seismic events. The orientation of the individual geophone was calculated with the constraint of the slope. We use both synthetic and field data to demonstrate the effectiveness and applicability of the proposed method. The results show that the new method can provide wavefields of horizontal component VSP data with much higher accuracy and resolution.

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Correction to: VSP polarization angles determination: Wysin-1 processing case study

Cited by 2 publications

References 0 publications

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A Novel Method for Determining Geophone Orientations From Zero-Offset VSP Data Constrained by Scalar Field

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