Some salient issues in vibrator data processing

Wason, Cameron B.; Potts, Mark J.

doi:10.1190/1.1894300

Cited by 3 publications

(2 citation statements)

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“…Experience with Vibroseis has shown that the ground coupling plays an important role in source signal distortion. Downhole measurements (Errico, Savelli and Flores 1981;Wason and Potts 1984) have confirmed this. As a result of these distortions the Vibroseis signal becomes asymmetrical after correlation.…”

Section: Introductionsupporting

confidence: 72%

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Signal Adjustment of Vibroseis and Impulsive Source Data*

Brötz

Marschall

Knecht

1987

Geophysical Prospecting

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In certain areas continuous Vibroseis profiling is not possible due to varying terrain conditions. Impulsive sources can be used to maintain continuous coverage. While this technique keeps the coverage at the desired level, for the processing of the actual data there is the problem of using different sources resulting in different source wavelets. In addition, the effect of the free surface is different for these two energy sources.The approach to these problems consists of a minimum-phase transformation of the two-sided Vibroseis data by removal of the anticipation component of the autocorrelation of the filtered sweep and a minimum-phase transformation of the impulsive source data by replacement of the recording filter operator with its minimum-phase correspondent. Therefore, after this transformation, both datasets show causal wavelets and a conventional deconvolution (spike or predictive) may be used. After stacking, a zero-phase transformation can be performed resulting in traces well suited for computing pseudo-acoustic impedance logs or for application of complex seismic trace analysis. The solution is also applicable to pure Vibroseis data, thereby eliminating the need for a special Vibroseis deconvolution.The processing steps described above are demonstrated on synthetic and actual data. The transformation operators used are two-sided recursive (TSR) shaping filters.After application of the above adjustment procedure, remaining signal distortions can be removed by modifying only the phase spectrum or both the amplitude and phase spectra. It can be shown that an arbitrary distortion defined in the frequency domain, i.e., a distortion of the amplitude and phase spectrum, is noticeable in the time section as a two-sided signal.

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Section: Introductionsupporting

confidence: 72%

“…To return to (8), Wood, Heiser, Treitel and Riley (1978) implemented a nonrecursive approach to debubble marine source wavelets. Instead of the forward and backward recursion they applied a two-sided Wiener inverse filter.…”

Section: (A) Vibroseis Datamentioning

confidence: 99%

Signal Adjustment of Vibroseis and Impulsive Source Data*

Brötz

Marschall

Knecht

1987

Geophysical Prospecting

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Experimental Analysis of the Polarity of Vibrator and Impulsive Source Data

Wason¹,

Brook²,

Meister³

1988

Exploration Geophysics

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Seismic data processing: Current industry practice and new directions

Schultz¹

1985

GEOPHYSICS

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The last ten years have seen an evolution in the state of the art for seismic data processing on a number of fronts. Data transformations investigated have made some types of analyses much more straightforward. Deconvolution has become a sophisticated process which includes statistical, model‐based, and deterministic methods. Vibroseis® processing has led to a greater understanding of the statistical limitations in recovery of the wave‐field amplitude from sign‐bit recording, and the deconvolution of Vibroseis data has improved. Multichannel filtering and analysis in transform domains have resulted in increasingly effective tools for noise reduction and signal enhancement. In statics analysis, surface consistency as a constraint remains a standard, and refraction analysis has become popular as a means of preconditioning data for residual statics estimation. Advances in stacking methodology have come mainly from addressing three effects: ray bending through lateral velocity variations, complex structure, and source‐receiver azimuth variations. Recently many techniques of interpretation processing have been introduced with the goal of improving the estimate of earth properties, rather than generating a stacked or imaged section of higher fidelity. The interaction among related disciplines has increased and this serves to amplify the effectiveness of each discipline because they are now developing in less isolation.

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Some salient issues in vibrator data processing

Cited by 3 publications

References 0 publications

Signal Adjustment of Vibroseis and Impulsive Source Data*

Signal Adjustment of Vibroseis and Impulsive Source Data*

Experimental Analysis of the Polarity of Vibrator and Impulsive Source Data

Seismic data processing: Current industry practice and new directions

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