Determination of water or residual oil saturation in earth formations independent of lithology
A method for determining the residual oil saturation of subsurface earth formations traversed by a borehole, substantially independent of salinity contrasts and lithology is described comprising steps of: traversing a borehole with a logging instrument to obtain first measurements functionally related to the electric permittivity of the formations surrounding the borehole, wherein the electric permittivity is functionally related to the reservoir porosity, water filled porosity, hydrocarbon filled porosity and rock matrix; injecting into the formations an oil miscible solution to displace substantially all the residual fluids contained in the measured formations; injecting into the formations a sufficient amount of water to render the measured formations substantially one hundred percent water saturated; traversing the borehole with a logging instrument to obtain second measurements functionally related to the electric permittivity of the measured formations, wherein the electric permittivity is functionally related to the reservoir porosity, water filled porosity and rock matrix; and combining the first and the second measurements to determine the residual oil saturation for the measured formations substantially independent of salinity contrasts and lithology.
- Assignee:
- Western Atlas International, Inc., Houston, TX
- Patent Number(s):
- US 4700140
- OSTI ID:
- 6003232
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
020300 -- Petroleum-- Drilling & Production
ELECTRIC LOGGING
ENERGY SOURCES
ENHANCED RECOVERY
EQUIPMENT
EXPLORATORY WELLS
FLUID INJECTION
FOSSIL FUELS
FUELS
MEASURING METHODS
MISCIBLE-PHASE DISPLACEMENT
OIL SATURATION
OIL WELLS
PETROLEUM
POROSITY
RECOVERY
RESERVOIR ROCK
RESIDUAL PETROLEUM
SATURATION
STIMULATION
WATER SATURATION
WELL LOGGING
WELL LOGGING EQUIPMENT
WELL STIMULATION
WELLS