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Techniques de traitement des données sismiques OBC dans le domaine tau-p 2D-3D

Abstract : The following PhD thesis deals with methods of water-layer multiple attenuation in OBC (Ocean Bottom Cable) data. These multiples are created by the reverberation of primary arrivals in the water column. The multiples have a strong negative impact on the final structural image obtained from OBC processing.

In this document, we propose a new methodology for multiple attenuation by developing a new PZ summation algorithm in the (Tau,p) domain.
We start by expressing the hydrophone and geophone measurements in the plane wave domain.
We show that these measurements can be expressed in terms of primary and water-layer multiple arrivals.
These expressions allow us to establish a new algorithm based on the physics of wave propagation in elastic media.

The new algorithm also takes into account the properties of OBC acquisitions such as geophone coupling and orientation, impulse response of the sensors and noise characteristics.
The new algorithm was first validated on synthetic data and then applied on a real 2D dataset as one step of a processing workflow.
This processing sequence results in attenuation of water-layer multiples and noise, thus improving image quality in comparison with standard processing approaches. Finally, we extend the processing methodology to 3D datasets through the 3D(,p) transform.
This application is not straightforward and necessitates additional steps in the workflow because, in this context, 3D data interpolation becomes crucial.
The final results of the 3D methodology show an important improvement of data quality in comparison with the standard processing sequences.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00204530
Contributor : Jean-Michel Vanpé <>
Submitted on : Monday, January 14, 2008 - 5:04:08 PM
Last modification on : Friday, September 6, 2019 - 3:00:06 PM
Long-term archiving on: : Thursday, September 27, 2012 - 2:15:17 PM

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  • HAL Id : tel-00204530, version 1

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Citation

Mohamed Tahar Amine Soudani. Techniques de traitement des données sismiques OBC dans le domaine tau-p 2D-3D. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00204530⟩

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