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Michael Fehler - One of the best experts on this subject based on the ideXlab platform.
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the effect of crack orientation on the Nonlinear Interaction of a p wave with an s wave
Geophysical Research Letters, 2016Co-Authors: James A Tencate, Alison Malcolm, Xuan Feng, Michael FehlerAbstract:Cracks, joints, fluids, and other pore-scale structures have long been hypothesized to be the cause of the large elastic Nonlinearity observed in rocks. It is difficult to definitively say which pore-scale features are most important, however, because of the difficulty in isolating the source of the Nonlinear Interaction. In this work, we focus on the influence of cracks on the recorded Nonlinear signal and in particular on how the orientation of microcracks changes the strength of the Nonlinear Interaction. We do this by studying the effect of orientation on the measurements in a rock with anisotropy correlated with the presence and alignment of microcracks. We measure the Nonlinear response via the traveltime delay induced in a low-amplitude P wave probe by a high-amplitude S wave pump. We find evidence that crack orientation has a significant effect on the Nonlinear signal.
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characterizing the Nonlinear Interaction of s and p waves in a rock sample
Journal of Applied Physics, 2015Co-Authors: Thomas Gallot, Alison Malcolm, Thomas L Szabo, Daniel R Burns, Stephen Brown, Michael FehlerAbstract:The Nonlinear elastic response of rocks is known to be caused by the rocks' microstructure, particularly cracks and fluids. This paper presents a method for characterizing the Nonlinearity of rocks in a laboratory scale experiment with a unique configuration. This configuration has been designed to open up the possibility of using the Nonlinear characterization of rocks as an imaging tool in the field. In our experiment, we study the Nonlinear Interaction of two traveling waves: a low-amplitude 500 kHz P-wave probe and a high-amplitude 50 kHz S-wave pump in a room-dry 15 × 15 × 3 cm slab of Berea sandstone. Changes in the arrival time of the P-wave probe as it passes through the perturbation created by the traveling S-wave pump were recorded. Waveforms were time gated to simulate a semi-infinite medium. The shear wave phase relative to the P-wave probe signal was varied with resultant changes in the P-wave probe arrival time of up to 100 ns, corresponding to a change in elastic properties of 0.2%. In orde...
Alison Malcolm - One of the best experts on this subject based on the ideXlab platform.
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the effect of crack orientation on the Nonlinear Interaction of a p wave with an s wave
Geophysical Research Letters, 2016Co-Authors: James A Tencate, Alison Malcolm, Xuan Feng, Michael FehlerAbstract:Cracks, joints, fluids, and other pore-scale structures have long been hypothesized to be the cause of the large elastic Nonlinearity observed in rocks. It is difficult to definitively say which pore-scale features are most important, however, because of the difficulty in isolating the source of the Nonlinear Interaction. In this work, we focus on the influence of cracks on the recorded Nonlinear signal and in particular on how the orientation of microcracks changes the strength of the Nonlinear Interaction. We do this by studying the effect of orientation on the measurements in a rock with anisotropy correlated with the presence and alignment of microcracks. We measure the Nonlinear response via the traveltime delay induced in a low-amplitude P wave probe by a high-amplitude S wave pump. We find evidence that crack orientation has a significant effect on the Nonlinear signal.
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characterizing the Nonlinear Interaction of s and p waves in a rock sample
Journal of Applied Physics, 2015Co-Authors: Thomas Gallot, Alison Malcolm, Thomas L Szabo, Daniel R Burns, Stephen Brown, Michael FehlerAbstract:The Nonlinear elastic response of rocks is known to be caused by the rocks' microstructure, particularly cracks and fluids. This paper presents a method for characterizing the Nonlinearity of rocks in a laboratory scale experiment with a unique configuration. This configuration has been designed to open up the possibility of using the Nonlinear characterization of rocks as an imaging tool in the field. In our experiment, we study the Nonlinear Interaction of two traveling waves: a low-amplitude 500 kHz P-wave probe and a high-amplitude 50 kHz S-wave pump in a room-dry 15 × 15 × 3 cm slab of Berea sandstone. Changes in the arrival time of the P-wave probe as it passes through the perturbation created by the traveling S-wave pump were recorded. Waveforms were time gated to simulate a semi-infinite medium. The shear wave phase relative to the P-wave probe signal was varied with resultant changes in the P-wave probe arrival time of up to 100 ns, corresponding to a change in elastic properties of 0.2%. In orde...
Thomas Gallot - One of the best experts on this subject based on the ideXlab platform.
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characterizing the Nonlinear Interaction of s and p waves in a rock sample
Journal of Applied Physics, 2015Co-Authors: Thomas Gallot, Alison Malcolm, Thomas L Szabo, Daniel R Burns, Stephen Brown, Michael FehlerAbstract:The Nonlinear elastic response of rocks is known to be caused by the rocks' microstructure, particularly cracks and fluids. This paper presents a method for characterizing the Nonlinearity of rocks in a laboratory scale experiment with a unique configuration. This configuration has been designed to open up the possibility of using the Nonlinear characterization of rocks as an imaging tool in the field. In our experiment, we study the Nonlinear Interaction of two traveling waves: a low-amplitude 500 kHz P-wave probe and a high-amplitude 50 kHz S-wave pump in a room-dry 15 × 15 × 3 cm slab of Berea sandstone. Changes in the arrival time of the P-wave probe as it passes through the perturbation created by the traveling S-wave pump were recorded. Waveforms were time gated to simulate a semi-infinite medium. The shear wave phase relative to the P-wave probe signal was varied with resultant changes in the P-wave probe arrival time of up to 100 ns, corresponding to a change in elastic properties of 0.2%. In orde...
Stephen Brown - One of the best experts on this subject based on the ideXlab platform.
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characterizing the Nonlinear Interaction of s and p waves in a rock sample
Journal of Applied Physics, 2015Co-Authors: Thomas Gallot, Alison Malcolm, Thomas L Szabo, Daniel R Burns, Stephen Brown, Michael FehlerAbstract:The Nonlinear elastic response of rocks is known to be caused by the rocks' microstructure, particularly cracks and fluids. This paper presents a method for characterizing the Nonlinearity of rocks in a laboratory scale experiment with a unique configuration. This configuration has been designed to open up the possibility of using the Nonlinear characterization of rocks as an imaging tool in the field. In our experiment, we study the Nonlinear Interaction of two traveling waves: a low-amplitude 500 kHz P-wave probe and a high-amplitude 50 kHz S-wave pump in a room-dry 15 × 15 × 3 cm slab of Berea sandstone. Changes in the arrival time of the P-wave probe as it passes through the perturbation created by the traveling S-wave pump were recorded. Waveforms were time gated to simulate a semi-infinite medium. The shear wave phase relative to the P-wave probe signal was varied with resultant changes in the P-wave probe arrival time of up to 100 ns, corresponding to a change in elastic properties of 0.2%. In orde...
Daniel R Burns - One of the best experts on this subject based on the ideXlab platform.
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characterizing the Nonlinear Interaction of s and p waves in a rock sample
Journal of Applied Physics, 2015Co-Authors: Thomas Gallot, Alison Malcolm, Thomas L Szabo, Daniel R Burns, Stephen Brown, Michael FehlerAbstract:The Nonlinear elastic response of rocks is known to be caused by the rocks' microstructure, particularly cracks and fluids. This paper presents a method for characterizing the Nonlinearity of rocks in a laboratory scale experiment with a unique configuration. This configuration has been designed to open up the possibility of using the Nonlinear characterization of rocks as an imaging tool in the field. In our experiment, we study the Nonlinear Interaction of two traveling waves: a low-amplitude 500 kHz P-wave probe and a high-amplitude 50 kHz S-wave pump in a room-dry 15 × 15 × 3 cm slab of Berea sandstone. Changes in the arrival time of the P-wave probe as it passes through the perturbation created by the traveling S-wave pump were recorded. Waveforms were time gated to simulate a semi-infinite medium. The shear wave phase relative to the P-wave probe signal was varied with resultant changes in the P-wave probe arrival time of up to 100 ns, corresponding to a change in elastic properties of 0.2%. In orde...
