Measurement of the trapped water can give information past water conditions in the subsurface.
Resistivity from oil-water inclusions (ROI™)
CSIRO's ROI™ technique has many advantages for the petroleum industry.
13 December 2005 | Updated 14 October 2011
Resistivity from oil-water inclusions (ROI™) is a technique used to determine water saturation in oil reservoirs.
The advantages of using ROI™ are:
it excludes fluid contamination from filtrate
it excludes spurious resistivities from groundwater flows
water resistivities can be obtained in areas where water samples cannot be taken.
CSIRO uses ROI™ to observe:
Background and technical information
In the ROI™ technique inclusions of oil and water are frozen and the melting temperature of the water part is measured to determine the resistivity of water in the reservoir at the time of accumulation of oil.
Resistivity from oil-water inclusions is a technique used to determine water saturation in oil reservoirs.
Depending on the age and fill history of hydrocarbons in the reservoir this provides a useful guide to the resistivity of irreducible water, a critical parameter used to determine water saturation in the reservoir.
Learn more about CSIRO's work in Energy from Oil & Gas.
ROI™ is a registered trademark of CSIRO Australia.