Induced polarization in hydrocarbon-saturated sands and sandstones: experimental study and general effective medium modeling
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چکیده
We have studied the induced polarization (IP) response of multiphase porous systems by conducting complex resistivity (CR) frequency-domain IP measurements for sands and sandstones samples containing salt water in pores and those whose unsaturated pores were filled with synthetic oil. The results of our study show that the oil saturated sands and sandstone samples are characterized by a significant IP response. We used a generalized effectivemedium theory of induced polarization (GEMTIP) model to analyze the IP parameters of the measured responses. A conceptual GEMTIP model of polarizing clusters is proposed to explain the observed IP phenomena. Our studies confirm earlier geophysical experiments with the application of the IP method for hydrocarbon (HC) exploration.
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