Time-dependent electrical parameters of rock-solution systems. Part I

Conference · Thu Apr 21 04:00:00 EST 1977

OSTI ID:7099574

Weed, H C; Piwinskii, A J; Keller, P

The electrical conductivity of 25.4 mm diameter cylindrical cores of sedimentary and igneous rocks was measured at a frequency of 1 kHz under ambient conditions after saturation in tap water and in 0.1 M NaCl solution. Between measurements, each rock was stored in contact with its own separate solution which at the start of the experiment was either tap water or 0.1 M NaCl solution. Eighteen rocks having porosities between 0.07 and 42 percent were investigated; ten were sedimentary, eight were igneous. All solution conductivities were measured employing a dip cell. The time dependence of the conductivity was investigated as well as the range of validity of Archie's Law. The Formation Factor and conductivity of rock specimens and their reacting solutions display time-dependent behavior up to 8000 hours. The Formation Factor and electrical conductivity depend on the salinity of the pore fluid, the rock porosity and permeability, and the clay minerals present in the rock.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7099574
• Report Number(s): UCRL-79013(Pt.1); CONF-770609-1
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
152002* -- Geothermal Data & Theory-- Properties of Minerals & Rocks
152003 -- Geothermal Data & Theory-- Rock-Water-Gas Interactions
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHLORIDES
CHLORINE COMPOUNDS
CLAYS
DISPERSIONS
DRILL CORES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FREQUENCY RANGE
HALIDES
HALOGEN COMPOUNDS
IGNEOUS ROCKS
KHZ RANGE
MINERALS
MIXTURES
PERMEABILITY
PHYSICAL PROPERTIES
POROSITY
ROCKS
SEDIMENTARY ROCKS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
TIME DEPENDENCE
WATER SATURATION