Systems and methods for enhancing low-frequency content in...

G - Physics – 01 – V

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G01V 1/00 (2006.01)

Patent

CA 2633917

This invention relates in general to vibroseis and, more specifically, but not by way of limitation, to the enhancement and/or signal strength optimization of low frequency content of seismic signals for use in surveying boreholes and/or subsurface earth formations. In embodiments of the present invention, physical properties of a seismic vibrator may be analyzed and used to provide for determination of a driving force necessary to drive a reaction mass to produce a sweep signal with enhanced low frequency content for injection into the ground for vibroseis. In certain aspects, the physical properties may be considered independent of any geophysical properties related to operation of the seismic vibrator.

L~invention concerne d~une façon générale la vibrosismique et plus particulièrement, mais pas exclusivement, l~accentuation et/ou l~optimisation de l~intensité de signal de composantes basses fréquences de signaux sismiques destinés à être utilisés dans l~étude de trous de forage et/ou de formations terrestres souterraines. Dans des modes de réalisation de l~invention, des propriétés physiques d~un vibreur sismique peuvent être analysées et utilisées pour déterminer une force d~entraînement requise pour entraîner une masse de réaction et générer ainsi un signal de balayage à composantes basses fréquences accentuées destiné à être injecté dans le sol pour réaliser l~acquisition vibrosismique. Selon certains aspects, les propriétés physiques peuvent être considérées indépendantes des propriétés géophysiques relatives au fonctionnement du vibreur sismique.

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