含黏土矿物岩心电频散特性实验研究
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摘要
为研究黏土矿物对岩石电阻率频散的影响关系,制作4种共16块人工柱塞状岩心,分别为纯砂岩,含蒙脱石、高岭石、伊利石3种黏土矿物砂岩。对其真空加压饱和2.5×10~3 mg/L的CaCl_2溶液,利用煤油驱替改变含水饱和度并进行电阻率频谱测量。分析岩心的电频散与含水饱和度、孔隙度、温度、黏土矿物种类及含量的关系,利用薄膜极化假说解释了含黏土矿物岩心异于常规的电频散现象,为电阻率频谱测井解决非常规复杂油气藏问题提供理论依据。
In order to study the effect of clay minerals on resistivity dispersion of rock,16 plungeshaped artificial cores were made.The lithology of these cores are pure sandstones,sandstones with montmorillonite,kaolinite and illite,respectively.These cores were saturated with 2.5×10~3 mg/L CaCl_2 solution.In order to measure the resistivity spectrum(measured by the 4294 A impedance analyzer)under different water saturation conditions,kerosene was used to displace the water in the core.Based on experiment,the relationship between the electric frequency dispersion of cores and water saturation,porosity,temperature,especially the types and content of clay minerals were analyzed in this paper,and the abnormal electric dispersion characteristics of the cores with clay mineral were also explained by the film polarization hypothesis.This study provides a theoretical basis for complex resistivity logging to solve unconventional and complex reservoir problems.
In order to study the effect of clay minerals on resistivity dispersion of rock,16 plungeshaped artificial cores were made.The lithology of these cores are pure sandstones,sandstones with montmorillonite,kaolinite and illite,respectively.These cores were saturated with 2.5×10~3 mg/L CaCl_2 solution.In order to measure the resistivity spectrum(measured by the 4294 A impedance analyzer)under different water saturation conditions,kerosene was used to displace the water in the core.Based on experiment,the relationship between the electric frequency dispersion of cores and water saturation,porosity,temperature,especially the types and content of clay minerals were analyzed in this paper,and the abnormal electric dispersion characteristics of the cores with clay mineral were also explained by the film polarization hypothesis.This study provides a theoretical basis for complex resistivity logging to solve unconventional and complex reservoir problems.
引文
[1]李建军,邓少贵,范宜仁.岩石复电阻率影响因素研究[C]∥中国石油天然气集团公司测井重点实验室学术会议,2004.
[2]肖占山,徐世浙,罗延钟,等.岩石复电阻率频散特性的机理研究[J].浙江大学学报(理学版),2006,33(5):584-587.
[3]关继腾,程媛媛,于华.利用等效电路模型研究泥质砂岩复电阻率频散特性[J].测井技术,2011,35(6):512-517.
[4]李建军,范宜仁,邓少贵.泥质砂岩电容率影响因素分析[J].测井技术,2005,29(6):499-501.
[5]王谦.含水泥质砂岩激发极化效应的微观机理及数值模拟研究[D].东营:中国石油大学,2010.
[6]邓少贵,边瑞雪,范宜仁,等.岩石电阻率频散及其对阿尔奇参数影响实验研究[J].石油地球物理勘探,1998,33(6):782-786.
[2]肖占山,徐世浙,罗延钟,等.岩石复电阻率频散特性的机理研究[J].浙江大学学报(理学版),2006,33(5):584-587.
[3]关继腾,程媛媛,于华.利用等效电路模型研究泥质砂岩复电阻率频散特性[J].测井技术,2011,35(6):512-517.
[4]李建军,范宜仁,邓少贵.泥质砂岩电容率影响因素分析[J].测井技术,2005,29(6):499-501.
[5]王谦.含水泥质砂岩激发极化效应的微观机理及数值模拟研究[D].东营:中国石油大学,2010.
[6]邓少贵,边瑞雪,范宜仁,等.岩石电阻率频散及其对阿尔奇参数影响实验研究[J].石油地球物理勘探,1998,33(6):782-786.