HR: 1330h
AN: H22C-0943    [PDF]
TI: Experimental/Laboratory Study of Zeta and Streaming Potentials at In Situ Conditions
AU: * Reppert, P M
EM: reppert@erl.mit.edu
AF: Massachusetts Institute of Technology, Earth resources Laboratory E34-462 42 Carleton Street, Cambridge, MA 02142 United States
AU: Morgan, F D
EM: morgan@erl.mit.edu
AF: Massachusetts Institute of Technology, Earth resources Laboratory E34-462 42 Carleton Street, Cambridge, MA 02142 United States
AB: Streaming Potentials and zeta potentials were measured at equilibrium conditions, while at elevated temperatures of 23-200 degrees C and pressures of 20 MPa, on intact rock samples of Fontainebleau Sandstone, Berea Sandstone, and Westerly Granite. The techniques for achieving and measuring streaming potentials at equilibrium conditions, while at elevated temperatures and pressures is presented. The streaming potential coupling coefficient for Fontainebleau sandstone decreased in magnitude from 195 nV/Pa at 23 degrees C to 33 nV/Pa at 160 degrees C before rising to 41 nV/Pa at 200 degrees C. The Berea Sandstone coupling coefficient decreased in magnitude from 100 nV/Pa at 23 degrees C to 23 nV/Pa at 160 degrees C and then increased in magnitude to 100 nV/Pa at 200 degrees C. The Westerly Granite coupling coefficient increased in magnitude from 23 nV/Pa at 40 degrees C to 68 nV/Pa at 120 degrees C, then decreased in magnitude to 43 nV/Pa at 160 degrees C and then increased in magnitude to 50 nV/Pa at 200 degrees C. The Fontainebleau Sandstone zeta potential changes in magnitude by approximately 0.036 mV/C degrees between 23C degrees and 120 degrees C. At 120C degrees the slope changes in magnitude to 0.15 mV/degree C and stays at that average slope until 200 degrees C is reached. The Berea Sandstone zeta potentials increased in magnitude in the region between 23-160 degrees C with a change in magnitude of 0.044 mV/degrees C, the region hotter then 160 degrees C changes in magnitude by 3.8 mV/degrees C. The Westerly Granite zeta potential changes in magnitude by 0.095 mv/degree C which then changes to 0.25 mv/degree C at 110 degrees C.
DE: 1832 Groundwater transport
DE: 1866 Soil moisture
DE: 1894 Instruments and techniques
DE: 3947 Surfaces and interfaces
DE: 5199 General or miscellaneous
SC: Hydrology [H]
MN: 2003 Fall Meeting