Water saturation evaluation method for coal seams based on complex resistivity spectrum experiments under high temperature and high pressure
HUANG Hang1, XU Wei1,2, WEI Ran1
1. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China; 2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China
Abstract：In the field of applied geophysics, complex resistivity spectrum technology has been widely used in exploring metal deposits and solving hydrogeological problems. However, the dispersion mechanism of coal complex resistivity and the evaluation methods of water saturation need to be further studied. In this paper, coal samples from Jiaozuo area of Henan Province are selected, so as to measure the complex resistivity spectrum under high temperature and high pressure. Furthermore, the dispersion characteristics of coal complex resistivity are analyzed under different temperatures, pressure, and water saturation. The study results show that the interfacial polarization frequency of the coal complex resistivity spectrum has a significantly linear negative correlation with pressure and water saturation and is negatively correlated with temperature in terms of its power function. In addition, the dispersion of the coal complex resistivity spectrum is remarkably correlated linearly with tempera-ture, pressure, and water saturation. The study results provide an experimental basis for quantitatively evaluating the influence of temperature, pressure, and water saturation on the dispersion characteristics of coal complex resistivity and offer a theoretical model for quantitatively evaluating the water saturation of coal seams under high temperature and high pressure.
黄航, 许巍, 魏然. 基于高温高压电频谱实验的煤层含水饱和度评价方法[J]. 石油地球物理勘探, 2023, 58(1): 145-151.
HUANG Hang, XU Wei, WEI Ran. Water saturation evaluation method for coal seams based on complex resistivity spectrum experiments under high temperature and high pressure. Oil Geophysical Prospecting, 2023, 58(1): 145-151.
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