Corrected GPR velocity and attenuation tomography of artifacts due to media anisotropy, borehole trajectory error, and instrumental drifts

Pascale Senechal; Fabrice Hollender; Gilles Bellefleur

doi:10.1117/12.383602

27 April 2000 Corrected GPR velocity and attenuation tomography of artifacts due to media anisotropy, borehole trajectory error, and instrumental drifts

Pascale Senechal, Fabrice Hollender, Gilles Bellefleur

Author Affiliations +

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383602
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

Abstract

Using standard inversion algorithm, velocity and attenuation tomograms can show artifacts which compromise interpretation. These artifacts can be due to errors in borehole trajectory measurements, medium anisotropy, T₀ (initial time) or A₀ (initial amplitude) drifts. In order to cancel these artifacts, the error sources can be introduced as unknown parameters in inversion algorithms (Hollender, 1999). In this paper, we present results obtained with crosshole radar data, recorded in a limestone quarry. Using the appropriate algorithms, all the artifacts have been cancelled and tomograms show clearly subhorizontal structures in agreement with the quarry stratification. In our data set, results do not reveal significant trajectory error, and T₀ and A₀ drifts are low. However, the presence of a velocity and attenuation anisotropy appears clearly on the tomograms. In the case of attenuation tomograms, the high anisotropy rates could be explained by the cumulative effect of the partitioning of energy due to reflection and transmission mechanisms at interfaces, and medium anisotropy.

Citation Download Citation

Pascale Senechal, Fabrice Hollender, and Gilles Bellefleur "Corrected GPR velocity and attenuation tomography of artifacts due to media anisotropy, borehole trajectory error, and instrumental drifts", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383602

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