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EXPERIMENTAL STUDY ON THE DISPERSION OF COMPLEX RESISTIVITY
The fracture can be a good channel for oil and gas migration, which has a great influence on the permeability of the reservoir. Therefore, it is of great significance to identify fractures and get the characterization parameters and physical properties of fractured reservoirs for the prediction of oil and gas production. In this paper, we used three groups of rock samples to study the relationship between water saturation Sw and complex resistivity of homogeneous and fractured rock samples at middle and low frequency(100-10KHz). The electrical and dielectric properties of the fractured rock are compared and analyzed. In this study, we used water saturation Sw, the resistance increase rate IR and the change rate of dielectric constant Ie to draw a picture. The experimental results show that there is no dispersion in the IR-Sw curve of the homogeneous rock sample, and there is a certain dispersion in the Ie-Sw curve. Fractured rock sample: the wider the fracture width, the higher the dispersion degree of IR-Sw and Ie-Sw, and the higher the dispersion point of IR corresponds to the water saturation value (Swc), that is, the faster the dispersion is achieved in the evaporation process; the greater the fracture density, the greater the dispersion of IR-Sw and Ie-Sw at 100Hz and 1KHz; when the fracture width is the same, with the increase of fracture angle ? (0 °< 90 °), the greater the dispersion of IR-Sw and Ie-Sw. Through the study of fractured rocks, it can provide theoretical and experimental support for the research and development of multi-frequency complex resistivity logging tool, and then improve the reliability of oil-bearing reservoir identification and quantitative evaluation of oil saturation of fractured reservoirs.
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Author(s):
Baozhi Pan, Ruhan A, Yuhang Guo, Lihua Zhang, Boyang Wei and Weiyi Zhou
Company(s):
Jilin University
Year:
2020
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