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常规电测井一般通过测量供电电极的电流和测量电极之间的电位差来计算围岩的视电阻率并划分地层界面,而忽略了对电流参数的利用。本文基于欧姆定律,通过供电电极电流的变化定性分析其周围岩矿石电阻的变化,进而用电流强度变化曲线识别地层属性。理论分析和试验结果表明,供电电极电流大小取决于电极的接触电阻,而视电阻率大小取决两个测量电极之间或供电与测量电极之间介质的电阻率总和,因此,电流比视电阻率对地层的灵敏度要高一些。绘制电流强度测井曲线可以准确划分地层层位,确定地层厚度,且不增加成本。
Conventional electrical logging generally calculates the apparent resistivity of surrounding rock and divides the formation interface by measuring the current between the supply electrode and the measuring electrode, ignoring the use of current parameters. Based on Ohm’s law, this paper qualitatively analyzes the change of resistance of rocks and rocks by the change of the current of the power supply electrode, and then identifies the formation property by the curve of current intensity. The theoretical analysis and experimental results show that the magnitude of the current supplied to the electrode depends on the contact resistance of the electrode and the apparent resistivity depends on the sum of the resistivities of the media between the two measuring electrodes or between the power supply and the measuring electrode. The sensitivity of the formation is higher. Drawing a current intensity log can accurately divide the formation horizon and determine the thickness of the formation without increasing costs.