Wettability literature survey. Part 3: The effects of wettability on the electrical properties of porous media

Journal Article · Mon Dec 01 04:00:00 EST 1986 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/13934-PA· OSTI ID:6828213

Anderson, W G

This paper examines the effects of wettability on the Archie saturation exponent and the formation factor, which are determined experimentally in cores. These parameters are important in the investigation of the hydrocarbon saturation of a formation by use of resistivity data obtained from well logging. The Archie saturation exponent, n, typically has a value of about 2 in water-wet formations and cleaned cores, while in native-state, non-water-wet cores and formations it is generally larger than 2. In uniformly oil-wet cores with low brine saturations, n can reach values of 10 or more. The exponent is higher in oil-wet cores at low saturations because a portion of the brine is trapped or isolated in dendritic fingers where it is unable to contribute to electrical conductivity. If a cleaned water-wet core is used to measure n and the reservoir is actually oil-wet, interstitial water will be underestimated during logging. No definite conclusions can be drawn about the effects of wettability on the formation factor. However, the wettability of clays in a core is likely to affect this parameter.

• Research Organization: Conoco Inc.
• OSTI ID: 6828213
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 39:13; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
BRINES
CLAYS
DATA ANALYSIS
DRILL CORES
ELECTRIC CONDUCTIVITY
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
GEOLOGIC DEPOSITS
GROUND WATER
HYDROCARBONS
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
MATERIALS
MINERAL RESOURCES
OIL SATURATION
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
POROUS MATERIALS
RESERVOIR ROCK
RESISTIVITY LOGGING
RESOURCES
ROCK-FLUID INTERACTIONS
SATURATION
WATER
WELL LOGGING
WETTABILITY