双侧向测井物理模拟实验仪器

介绍了根据电磁场相似理论建立的一套室内双侧则井缩比物理模型。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，步进电机度系统和微机三部分组成，地面电路包括主电流道、反馈环路、电流测量道、两道电矸测量道以及校验验道。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。

Experimental Instrument for Physical Analogy of Dual Laterolog

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.