Geology & Geophysics Editors' Highlights

Acoustic Monitoring of Inelastic Compaction in Porous Limestone

During triaxial compression experiments, acoustic monitoring reveals compaction localization in a high porosity limestone, accompanied by a significant decrease in P-wave velocity.

Source: Journal of Geophysical Research: Solid Earth


By

An understanding of the short- and long-term evolution of carbonate reservoirs hinges upon a fundamental understanding of inelastic compaction of porous limestone. With the development of 4D seismic monitoring, a better understanding of the in situ evolution of elastic wave velocities of porous carbonates during production or carbon dioxide injection is also clearly needed. A new set of high pressure compression experiments by Baud et al. [2017] revealed that inelastic compaction in Saint Maximin limestone was accompanied by abundant acoustic emission activity, capturing strain localization. Microstructural analysis showed grain crushing was the main mechanism of inelastic compaction in the studied limestone. Microcracking reduced P-wave velocity near the onset of inelastic compaction, while porosity reduction resulted in a significant increase in P-wave velocity.

Citation: Baud, P., Schubnel, A., Heap, M., & Rolland, A. [2017]. Inelastic compaction in high-porosity limestone monitored using acoustic emissions. Journal of Geophysical Research: Solid Earth, 122, 9989–10,008. https://doi.org/10.1002/2017JB014627

—André Revil, Editor, JGR: Solid Earth

© 2018. The authors. CC BY-NC-ND 3.0