On the source-frequency dependence of fracture-orientation estimates from shear-wave transmission experiments

Santos, Leo K.; Figueiredo, José J. S. de; Omoboya, Bode; Schleicher, Jörg; Stewart, Robert R.; Dyaur, Nikolay

doi:10.1016/j.jappgeo.2014.12.018

Cited by 18 publications

(13 citation statements)

References 15 publications

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“…; Santos et al . ). From the experimental point of view, it is impossible to validate by comparing the theoretical results with results obtained from the measurements conducted on natural materials like geomaterial (soils, rocks).…”

Section: Laboratory Experimentsmentioning

confidence: 97%

“…; Santos et al . ). Corresponding to the theories, the geometry of cracks takes the ideal circular form (penny‐shaped cracks), whereas the distribution of cracks is uniform in space.…”

Section: Laboratory Experimentsmentioning

confidence: 97%

“…In different contributions, the synthetic sample is constructed from epoxy resin matrix (Santos et al . ), sand bonded by epoxy (Rathore et al . ; Tillotson et al .…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…; Santos et al . ) trying to verify the validity of these theories. Although it is extremely difficult to interpret the measured data conducted on natural materials due to its infinite knowledge parameters (cracks size, shape, and spatial distribution), the validation was usually carried out on synthetic medium in which damage parameters can be better controlled.…”

Section: Introductionmentioning

confidence: 99%

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P‐ and S‐wave anisotropy to characterise and quantify damage in media: laboratory experiment using synthetic sample with aligned microcracks

Baba

Hoxha

2017

Geophysical Prospecting

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Damage characterisation in solid media is studied in this work through ultrasonic measurements. A synthetic three‐dimensional printed sample including a system of horizontally aligned microcracks is used. In contrast to other manual fabrication methods presented in the literature, the construction process considered here ensures a better control and accuracy of size, shape, and spatial distribution of the microcrack network in the synthetic sample. The acoustic measurements were conducted through a specific device using triple acoustic sensors, which allows capturing at each incident direction three wave modes. The evolution of the ultrasonic velocities with respect to incident angle accounted for the damage‐induced anisotropy. The experimental results are then compared with some well‐known effective media theories in order to discuss their potential use for the following studies. Finally, we highlighted and compared the accuracy of these theories used for inversion procedure to quantify damage in the medium.

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Section: Laboratory Experimentsmentioning

confidence: 97%

“…; Santos et al . ). Corresponding to the theories, the geometry of cracks takes the ideal circular form (penny‐shaped cracks), whereas the distribution of cracks is uniform in space.…”

Section: Laboratory Experimentsmentioning

confidence: 97%

“…In different contributions, the synthetic sample is constructed from epoxy resin matrix (Santos et al . ), sand bonded by epoxy (Rathore et al . ; Tillotson et al .…”

Section: Laboratory Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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P‐ and S‐wave anisotropy to characterise and quantify damage in media: laboratory experiment using synthetic sample with aligned microcracks

Baba

Hoxha

2017

Geophysical Prospecting

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“…() and Santos et al . () constructed anisotropic samples with elongated cracks positioned in such a way to create different regions where within each region, the cracks shown the same orientation, but the latter changed from region to region. They showed the importance of S‐wave birefringence to find the fracture preferential direction in fractured media with different fracture orientations.…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of effective anisotropic crack theories in variable crack aspect ratio medium

Henriques

Figueiredo

Santos

et al. 2017

Geophysical Prospecting

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A B S T R A C TPhysical modelling of cracked/fractured media using downscaled laboratory experiments has been used with great success as a useful alternative for understanding the effect of anisotropy in the hydrocarbon reservoir characterization and in the crustal and mantle seismology. The main goal of this work was to experimentally verify the predictions of effective elastic parameters in anisotropic cracked media by Hudson and Eshelby-Cheng's effective medium models. For this purpose, we carried out ultrasonic measurements on synthetic anisotropic samples with low crack densities and different aspect ratios. Twelve samples were prepared with two different crack densities, 5% and 8%. Three samples for each crack density presented cracks with only one crack aspect ratio, whereas other three samples for each crack density presented cracks with three different aspect ratios in their composition. It results in samples with aspect ratio values varying from 0.13 to 0.26. All the cracked samples were simulated by penny-shaped rubber inclusions in a homogeneous isotropic matrix made with epoxy resin. Moreover, an isotropic sample for reference was constructed with epoxy resin only. Regarding velocity predictions performed by the theoretical models, Eshelby-Cheng shows a better fit when compared with the experimental results for samples with single and mix crack aspect ratio (for both crack densities). From velocity values, our comparisons were also performed in terms of the ε, γ , and δ parameters (Thomsen parameters). The results show that Eshelby-Cheng effective medium model fits better with the measurements of ε and γ parameters for crack samples with only one type of crack aspect ratio.

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Acoustic Measurements on Synthetic Fractured Samples Made Using FDM 3D Printing Technology

et al. 2021

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This paper presents the acoustic measurements results on synthetic samples containing a system of oriented disc-shaped cracks simulating a fractured medium. An effective model for such media is a model with a transversely isotropic symmetry system under the condition that the host medium is isotropic. FDM 3D printing technology with molten plastic thread was used to form synthetic samples. The results of the recorded acoustic measurements have shown the occurrence of anisotropy of the host medium due to horizontal layering of plastic threads. In the case of printing internal cracks using this technology, the samples contain inhomogeneities due to the greater sintering of plastic threads around the cracks. It was also shown that the use of SLA technology (printing from liquid photopolymer) potentially avoids the indicated effects, but requires developing the technique for printing samples with cracks. Acoustic measurements on the sample without cracks formed by this technique confirmed its isotropy.

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On the source-frequency dependence of fracture-orientation estimates from shear-wave transmission experiments

Cited by 18 publications

References 15 publications

P‐ and S‐wave anisotropy to characterise and quantify damage in media: laboratory experiment using synthetic sample with aligned microcracks

P‐ and S‐wave anisotropy to characterise and quantify damage in media: laboratory experiment using synthetic sample with aligned microcracks

Experimental verification of effective anisotropic crack theories in variable crack aspect ratio medium

Acoustic Measurements on Synthetic Fractured Samples Made Using FDM 3D Printing Technology

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