A laboratory study of inelastic deformation and localization was conducted to evaluate microseismicity and fracture in fluid-saturated rock. Plane strain compression experiments were performed on oil- and water-saturated Berea sandstone under dry, drained, undrained, and quasi-unjacketed conditions. Parameters associated with the elastic and inelastic material response were accurately measured and used in a constitutive model to predict localization of deformation under the drained and undrained conditions. Acoustic emission (AE) activity was recorded and the onset of inelastic response in fluid-saturated rock, similar to dry rock, coincided with an increase in AE rate. Fracture initiation and propagation were successfully monitored by AE locations. Clustering of AE events and the start of inhomogeneous deformation inferred from displacement measurements are shown to be well correlated with the model prediction of the onset of localized deformation under various rock-fluid interaction conditions.
|Original language||English (US)|
|Journal||International Journal of Rock Mechanics and Mining Sciences|
|State||Published - Oct 2020|
Bibliographical noteFunding Information:
Partial support was provided by DOE grant DE-FE0002020 founded through the American Recovery and Reinvestment Act and UMN Undergraduate Research Opportunities Program (UROP). The authors would like to thank James Meyer and Chu-Shu Kao for the assistance with the experiments. The insightful comments of Yves Guéguen and an anonymous reviewer are appreciated.
© 2020 Elsevier Ltd
- Acoustic emission
- Fluid-saturated rock