基于高温高压电频谱实验的煤层含水饱和度评价方法  

Water saturation evaluation method for coal seams based on complex resistivity spectrum experiments under high temperature and high pressure

作　　者：黄航 许巍[1,2] 魏然 HUANG Hang;XU Wei;WEI Ran(College of Geophysics and Petroleum Resources,Yangtze University,Wuhan,Hubei 430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan,Hubei 430100,China)

机构地区：[1]长江大学地球物理与石油资源学院,湖北武汉430100 [2]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100

出　　处：《石油地球物理勘探》2023年第1期145-151,共7页Oil Geophysical Prospecting

基　　金：油气资源与探测国家重点实验室开放基金项目“油气储层电频谱探测特性及导电机理研究”(PRP/open-1704);油气资源与勘探技术教育部重点实验室开放基金项目“基于岩心复电阻率频谱的油气评价方法研究”(K2018-12)联合资助。

摘　　要：在应用地球物理领域,复电阻率频谱技术在寻找金属矿藏和解决水文地质问题等方面得到了广泛应用,但关于煤样复电阻率的频散机理和含水饱和度评价方法尚待进一步研究。文中选用河南焦作地区煤样开展高温、高压条件下的复电阻率频谱测量,研究了不同温度、压力及含水饱和度条件下煤样的复电阻率频散特征。研究结果表明,煤样复电阻率频谱中界面极化频率与压力、含水饱和度均呈明显的线性负相关关系,与温度呈幂函数负相关关系,而煤样复电阻率频谱频散度与温度、压力及含水饱和度均呈明显的线性关系。研究结果为定量评价温度、压力及含水饱和度对煤样复电阻率频散特征的影响提供了实验基础,为高温、高压条件下煤层含水饱和度的定量评价提供了理论模型。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.

关 键 词：高温高压 复电阻率 界面极化频率 激发极化 煤层含水饱和度 

分 类 号：P631[天文地球—地质矿产勘探]