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Title: The Effect of Crack Orientation on the Nonlinear Interaction of a P-wave with an S-wave

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Geophysics Group, Earth and Environmental Sciences Division, Los Alamos National Lab, Los Alamos NM USA
  2. Earth Sciences Department, Memorial University, St John's NL Canada
  3. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge MA USA; Jilin University, Changchun China
  4. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge MA USA
Publication Date:
OSTI Identifier:
1259957
Report Number(s):
LA-UR--15-29525
Journal ID: ISSN 0094-8276
Grant/Contract Number:
AC52-06NA25396; 41430322
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Natural Science Foundation of China
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES nonlinear elasticity; microcrack orientation; imaging; nonlinearity; cracks sandstone