A new rock electrical dispersion characteristic parameter dispersion rate P is constructed based on physical mechanism of rock electrical parameters dispersion characteristics. By comparing the electric dispersion experimental analysis of reservoir rocks and artificial rock samples under simulated reservoir conditions, the response relationship between the dispersion rate P and the reservoir parameters such as saturation, porosity, permeability and cation exchange capacity Qv is established. The research shows that the dispersion rate P has a good linear relationship with water saturation and porosity. The dispersion rate P has a good power-law relationship with the permeability and cation exchange capacity Qv. Compared with the modulus dispersion rate PZ and the real part dispersion rate PR, the phase dispersion rate Pφ and the imaginary part dispersion rate PL can characterize the electrical dispersion of the rock better. The dispersion rate P and reservoir parameters have good correlation and indication, and can be used as reservoir evaluation parameters for resistivity spectrum logging.
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