TY - GEN
T1 - A review of frictional sliding on brine-penetrated faults in salt
AU - Niemeijer, André
AU - van den Ende, Martijn
AU - Spiers, Chris
AU - Marone, Chris
PY - 2022/7/5
Y1 - 2022/7/5
N2 - We review and discuss experimental observations of the frictional sliding ofporous, fluid saturated faults in salt. In previous work, granular salt has been used almostexclusively as an analogue for quartz under hydrothermal conditions due to its high solubilityat room temperature. However, the frictional behavior of salt itself is of interest, sincelocalized frictional or frictional-viscous shear might occur at low effective stresses, such asthose expected if migrating brine permeates localized zones during salt tectonics or aftercavern abandonment. Results from slide-hold-slide experiments, performed at roomtemperature and an effective normal stress of 1, 2.5 and 5 MPa, show that porous/granularfaults in salt regain strength within hours. Slip-dependent weakening, velocity-weakening andstick-slip behavior were observed during sliding at constant velocity, implying significantpotential for unstable, localized deformation under fluid-saturated conditions. The resultsdemonstrate that localized frictional or frictional-viscous shear of salt could occur in fluidpermeated zones at interfaces between lithologies, is potentially unstable and might providepathways for fluid expulsion.
AB - We review and discuss experimental observations of the frictional sliding ofporous, fluid saturated faults in salt. In previous work, granular salt has been used almostexclusively as an analogue for quartz under hydrothermal conditions due to its high solubilityat room temperature. However, the frictional behavior of salt itself is of interest, sincelocalized frictional or frictional-viscous shear might occur at low effective stresses, such asthose expected if migrating brine permeates localized zones during salt tectonics or aftercavern abandonment. Results from slide-hold-slide experiments, performed at roomtemperature and an effective normal stress of 1, 2.5 and 5 MPa, show that porous/granularfaults in salt regain strength within hours. Slip-dependent weakening, velocity-weakening andstick-slip behavior were observed during sliding at constant velocity, implying significantpotential for unstable, localized deformation under fluid-saturated conditions. The resultsdemonstrate that localized frictional or frictional-viscous shear of salt could occur in fluidpermeated zones at interfaces between lithologies, is potentially unstable and might providepathways for fluid expulsion.
U2 - 10.1201/9781003295808-4
DO - 10.1201/9781003295808-4
M3 - Conference contribution
SN - 9781032282206
SP - 38
EP - 45
BT - The Mechanical Behavior of Salt X
A2 - Bresser, J.H.P. de
A2 - Drury, M.R.
A2 - Fokker, P. A.
A2 - Gazzani, M.
A2 - Hangx, S.J.T.
A2 - Niemeijer, A.R.
A2 - Spiers, C.J.
PB - CRC Press
CY - London
T2 - 10th Conference on the Mechanical Behavior of Salt
Y2 - 6 July 2022 through 8 July 2022
ER -