Mechanical and Acoustic Response of Laboratory Fault-valve Media to Fluid Injections
Description:
The underlying mechanism of fluid-solid interactions remains elusive in the fault-valve systems. Here, we design a new experimental apparatus that enables us to both visualize and listen to the fluid transport and its interplay with granular assemblies within artificial fault-valve media. This setup, featuring regions of alternating permeability, allows us to explore compaction and dilation behaviors that emerge under fluid injection flow. Our research seeks to unravel two primary questions: 1) how does fluid flow interact with porous media and barriers? 2) how to reveal those interactions from acoustic and pressure measurements? Our investigations suggest the following findings: 1) hydraulic transient is observed after/during compaction, which accelerates dilation and is regulated by barrier opening; 2) active acoustic measurements are capable of detecting changes associated with compaction and dilation processes; 3) passive acoustic measurements, conducted at varying injection rates, indicate that the occurrence rate of acoustic emissions is influenced by changes in pore fluid pressure. These direct observations offer a deeper understanding of fluid dynamics in fault zones and their potential to trigger seismic activities.
Session: Mechanistic Insights into Fluid-induced Earthquakes from the Laboratory to the Field - II
Type: Oral
Date: 4/15/2025
Presentation Time: 05:30 PM (local time)
Presenting Author: Congcong
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Congcong Yuan Presenting Author Corresponding Author cy547@cornell.edu Cornell University |
Angus Bell angusthebell@gmail.com University of Massachusetts, Lowell |
Lluís Saló-Salgado lsalo@fas.harvard.edu Harvard University |
Yujing Du yujingdu@g.harvard.edu Harvard University |
Marine Denolle mdenolle@uw.edu University of Washington |
Lizhi Xiao xiaolizhi@cup.edu.cn China University of Petroleum |
David Weitz weitz@seas.harvard.edu Harvard University |
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Mechanical and Acoustic Response of Laboratory Fault-valve Media to Fluid Injections
Session
Mechanistic Insights into Fluid-induced Earthquakes from the Laboratory to the Field