Petroleum Engineering
Impedance Spectroscopy for Assessing the Wetting Conditions of Reservoir Rocks
The wetting conditions of reservoir rocks influence important reservoir characteristics like
relative permeabilities, residual oil or water saturation. In this project we studied, if Impedance
Spectroscopy (IS) can provide a characterization of the wetting state.
We first examined numerical model systems of water filled connected pores considering the
electrical double layer at the fluid rock interface. The resulting understanding of the system
was used to design an experimental study, conducted on a reference system of sintered
borosilicate samples. These experiments were conducted in parallel with measurements on
reservoir rocks, which conclude our study.
Both the numerical simulation and the measurements on synthetic samples show that qualitative
wettability information can be derived from IS data for sufficiently fine pored rock with
low saline pore water. The presence of IS effects in low saline environments can be confirmed
for reservoir rocks, allowing for an application e.g. in the context of “low salinity flooding”,
even though not for high salinity reservoir conditions.
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