用数值模拟法开展裂缝型储层电阻率控制因素研究  

A study of the Controlling Factors on the Resistivity of Fractured Reservoir Using the Numerical Simulation

作　　者：张兆辉[1] 高楚桥[2] 高永德 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]长江大学地球物理与石油资源学院,湖北荆州434023 [3]中海油南海西部研究院,广东湛江524057

出　　处：《天然气地球科学》2014年第2期252-258,共7页Natural Gas Geoscience

基　　金：国家重点基础研究发展计划"973"项目(编号:2012CB214804)资助

摘　　要：裂缝型储层导电机理复杂,电阻率影响因素众多。基于双侧向测井原理,通过构建合理的地质模型,理论模拟裂缝全含水、全含油时岩石电阻率,并对各种影响因素逐一进行分析,这些因素主要包括地层水电阻率、基质电阻率、裂缝倾角、裂缝宽度、基质孔隙度及M值等,进一步探讨了各因素对储层电阻率的影响程度。结果表明:①岩石电阻率随着基质电阻率的增大而增大,且裂缝全含油岩石电阻率的增大率要高于裂缝全含水的情况;随着基质电阻率的增大,流体性质对岩石电阻率的影响程度也增大。②固定基质电阻率,岩石电阻率随着地层水电阻率和裂缝倾角的增大而增大,随着裂缝宽度的增大而减小,且对裂缝全含水岩石电阻率的影响程度要高于裂缝全含油情况;地层水电阻率和裂缝倾角越小、裂缝宽度越宽,流体性质对岩石电阻率的影响越大。③基质电阻率由阿尔奇公式确定,岩石电阻率随着基质孔隙度的增大而减小,随着M值的增大而增大,且对裂缝全含油岩石的影响程度要高于裂缝全含水的情况;基质孔隙度越小、M值越大,流体性质对岩石电阻率的影响越大。④M值、基质电阻率对岩石电阻率的影响最大,其次是裂缝倾角与裂缝宽度,而地层水电阻率的影响最小。Many factors affects the resistivity of fractured reservoir, and the reservoir conductive mechanism is complex. Based on the dual laterolog principle,through the construction of reasonable geological model, the resistivity of water saturated fractured rock and oil saturated fractured rock was simulated theoretical- ly,and the factors are analyzed. The factors include resistivity of formation water, resistivity of matrix, fracture dip, fracture width, porosity of matrix, M value, and so on. At last, the affecting degree to resistivi- ty of reservoir is discussed. The simulated results showed that： （1）With the increasing of the resistivity of matrix,the resistivity of reservoir gradually increases,and the increasing degree of oil saturated fractured rock is bigger than that of the water saturated fractured rock. The affecting degree of fluid properties for the resistivity of reservoir increases gradually with the increase of the resistivity of matrix. （2）The resistiv ity of matrix is fixed. With the increasing of the resistivity of formation water and fracture dip, the resistivi- ty of reservoir gradually increases, but for the fracture width, the condition is opposite. The affecting degree of water saturated fractured rock is bigger than that of the oil saturated fractured rock, and the affecting degree of fluid properties for the resistivity of reservoir increases gradually with the reduction of the resis tivity of formation water and fracture dip and the increasing of fracture width. （3）The resistivity of matrix was determined by archie formula. With the increasing of the porosity of matrix,the resistivity of reservoir gradually reduced, but for the M value,the condition is opposite. The affecting degree of oil saturated frac- tured rock is bigger than that of the water saturated fractured rock, and the affecting degree of fluid proper- ties for the resistivity of reservoir increases gradually with the reduction of the porosity of matrix and in- creasing of M value. （4）The affecting degree of M

关 键 词：裂缝型储层 地质模型 理论模拟 电阻率 

分 类 号：TE132.14[石油与天然气工程—油气勘探]