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Continuous Data Processing for Comprehensive and Effective Reflection Seismic Survey.

Blouin, Martin; Gloaguen, Erwan (2014). Continuous Data Processing for Comprehensive and Effective Reflection Seismic Survey. In: Symposium on the Application of Geophysics to Engineering and Environmental Problems - SAGEEP 2014, 16-20 mars 2014, Boston, États-Unis.

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Résumé

The development of vibrating sources and landstreamers in the last few decades favored a building interest for reflection seismic in near-surface characterization. The Geological Survey of Canada (GSC) extensively tested environmental and geotechnical applications of high-resolution shear-wave profiling across Canada and well demonstrated the great potential of the method to image the stratigraphy in unconsolidated environments. Moreover, recent developments of truck-tractable seismic source generating pure S-wave as well as P-wave has allowed the method to become more versatile for different geological contexts and field conditions. As the tools become more accurate and easy to manipulate, the cost-effectiveness, the reliability and the ability to cover greater distance per day significantly increased. However, environmental assessment requires small shot intervals and several 3C geophones leading to huge data sets. The possibility for adequate real-time QC and on-site decision-making becomes trickier with looking solely at raw data. However, inferring the processing parameters on calibrating areas at the beginning of a survey would permit to optimized them “on the fly” in order to furnish a real-time stacked section to the QC. We built a Python based algorithm allowing the data processing as the acquisition takes place. A graphical user interface prompts the user for geometry parameters, desired flow steps and processing algorithms parameters (e.g. nmo velocity ranges). Multiple stacked sections can be displayed using different parameters as a predefined shot increment is reached. The input processing variables can be modified during the acquisition process to adjust to lithological variations or soft a priori information. In partnership with MBMS Solution, a Quebec geophysical consulting firm that built a seismic reflection acquisition system, the processing routine was tested in the area of Chaudière, Québec, Canada. First insight shows that the real-time processing permits to increase efficiency both in terms of data acquisition and data processing.

Type de document: (NON SPÉCIFIÉ)
Mots-clés libres: seismic reflection; seismic processing ; landstreamer; vibrating source
Centre: Centre Eau Terre Environnement
Date de dépôt: 13 déc. 2016 20:55
Dernière modification: 13 déc. 2016 20:55
URI: http://espace.inrs.ca/id/eprint/3544

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