双侧向测井物理模拟实验仪器

Experimental Instrument for Physical Analogy of Dual Laterolog

柯式镇等：双侧向测并物理模拟实验仪器，测井技术，１９９６（４）２０，２８２～２８６。介绍了根据电磁场相似理论建立的一套室内双侧向测井缩比物理模型。该模型包括模型井和模拟实验仪器两大部分。其中模拟实验仪器由地面电路，步进电机深度系统和微机三部分组成。地面电路包括主电流道、屏蔽电流道、反馈环路、电流测量道、两道电压测量道以及校验道。整套仪器的工作均在微机的控制之下进行，通过测量主电流和两监督电极中点的电位而获得被测地层的电阻率。

A scale model for DLL physical analogy is constructed in a laboratry according to the similarity theory of electromagnetic field. The scale model has two parts: a scale model formation and a simulated testing instrument which is composed of a surface instrument, a depth survey system with stepper motor and a microcomputer. The surface instrument contains main current channel, bucking current channel, feedback loop, current measurement channel, two votage measurement channels and checking channel. Under the control of micro-computer, the resistivity of the formation measured is derived from the main current and the midpoint potential of the two monitor electrodes.