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Ultra-low frequency phase assessment for broadband data

EAGE - European Association of Geoscientists and Engineers, May, 2016
Feng Yang | Ronan Sablon | Robert Soubaras
©2016 EAGE

Reliable low frequency content and phase alignment are critical for broadband seismic inversion and the prediction of reservoir properties. However, currently there is a lack of tools for ultra-low frequency (less than 5 Hz) quality and phase assessment. A focusing metric in the impedance domain is proposed to assess the ultra-low frequency phase alignment. The method has been applied on a real broadband dataset for the assessment of the residual phase correction process and the conclusion is validated by using well information.

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Use of ambient noise to enhance the low frequencies of seismic migration images

EAGE - European Association of Geoscientists and Engineers, May, 2016
Benoit De Cacqueray | Julien Cotton | Florian Duret | Cecile Berron | Eric Forgues
©2016 EAGE

For seismic exploration (i.e. reservoir geophysics), retrieval of body waves appears promising, especially at low frequencies (below 3 Hz) where seismic vibrators reach a limit. These low frequencies are of interest for velocity model building (Baeten et al. 2013) and for broadband seismic inversion (Kneller et al. 2014). Here we demonstrate an example of body wave retrieval using ambient noise correlation in the context of seismic monitoring. The result of the ambient noise correlation is correctly arranged to produce noise-induced shot point gathers at each sensor positions. The noise-induced migrated image is compared and then combined with the image obtained by migrating the conventional active shot point gathers generated by vibroseismic sources (Cotton et al, 2014). In so doing, we considerably broaden the image spectrum toward the low frequencies.

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Ultra-low frequency phase assessment for broadband data

EAGE - European Association of Geoscientists and Engineers, May, 2016
Feng Yang | Ronan Sablon | Robert Soubaras
©2016 EAGE

Reliable low frequency content and phase alignment are critical for broadband seismic inversion and the prediction of reservoir properties. However, currently there is a lack of tools for ultra-low frequency (less than 5 Hz) quality and phase assessment. A focusing metric in the impedance domain is proposed to assess the ultra-low frequency phase alignment. The method has been applied on a real broadband dataset for the assessment of the residual phase correction process and the conclusion is validated by using well information.

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Customization of Preconditioning and Inversion processes for broadband data. A case study from the Campos Basin, Brasil.

EAGE workshop/forum/local conference, May, 2016
Ekaterina Kneller
©2016 EAGE

The use of broadband data in reservoir characterization has proven advantages. However, the whole workflow should be reviewed and renewed in order to get all the advantages of broadband data.

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Quantitative Interpretation - Broadband Data Uplift

EAGE workshop/forum/local conference, May, 2016
Loic Michel | Ronan Sablon
©2016 EAGE

Using pre-stack model-based inversion we will analyze the impact of marine seismic acquisition and processing on our ability to predict elastic parameters.

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