摘要
电阻率各向异性是影响煤储层电法勘探的重要因素,针对煤样复电阻率各向异性的参数评价,对焦作地区煤矿储层沿平行和垂直层理方向分别钻取了煤样,并在高温高压条件下测量得到了相应的复电阻率频谱。为了定量分析温度、压力对煤样复电阻率各向异性的影响,建立了煤样不同方向频散参数(界面极化频率、模值频散度、弛豫时间)与温度压力的对应关系,电阻率各向异性系数与温度、压力的对应关系。结果表明:平行层理方向频散参数均与温度、压力呈现良好的线性关系,垂直层理方向频散参数的线性关系不如平行层理方向好;任意方向煤样频散与温度、压力的响应关系都可以用弛豫时间来定量评价;随温度升高各向异性系数增大,随压力增大各向异性系数变化不明显。研究结果可为更精确地定量评价温度、压力对煤储层电各向异性的影响提供实验基础和理论参考。
Resistivity anisotropy is an important factor affecting the electrical exploration of coal reservoirs.According to the parameter evaluation of coal sample complex resistivity anisotropy,coal samples were drilled along the parallel and vertical bedding directions of coal reservoirs in Jiaozuo area,and the corresponding complex resistivity spectrum was measured under the condition of high temperature and high pressure.In order to quantitatively analyze the influence of temperature and pressure on the complex resistivity anisotropy of coal samples,the corresponding relationship between the dispersion parameters in different directions(interface polarization frequency,modulus dispersion and relaxation time)and temperature and pressure,and the corresponding relationship between the resistivity anisotropy coefficient and temperature and pressure were established.The result show that the dispersion parameters in the direction of parallel bedding have a good linear relationship with temperature and pressure,and the linear relationship of the dispersion parameter in the direction of vertical bedding is worse than that in the direction of parallel bedding.The response of dispersion to temperature and pressure and pressure in any direction can be quantitatively evaluated by relaxation time.The anisotropy coefficient increases with the increase of temperature,but the anisotropy coefficient does not change significantly with the increase of pressure.The research result make up for the shortage of complex resistivity dispersion data in coal resistivity anisotropy experiment under high temperature and high pressure conditions,and provide experimental basis and theoretical reference for more accurate quantitative evaluation of the influence of temperature and pressure on the electrical anisotropy of coal reservoir.
作者
段威
许巍
刘俊博
胡宇博
黄航
DUAN Wei;XU Wei;LIU Jun-bo;HU Yu-bo;HUANG Hang(School of Geophysics and Oil Resources,Yangtze University,Wuhan 430100,China;Key Laboratory of Exploration Technology for Oil and Gas Resources,Yangtze University,Wuhan 430100,China)
出处
《科学技术与工程》
北大核心
2022年第21期9223-9230,共8页
Science Technology and Engineering
基金
油气资源与探测国家重点实验室开放基金(PRP/open-1704)
湖北省教育厅青年人才项目(Q20171304)。
关键词
复电阻率
电阻率各向异性
高温高压
界面极化频率
complex resistivity
resistivity anisotropy
high temperature and high pressure
interface polarization frequency
