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本文通过水槽模型模拟实验，提出了基于直流电阻率测试原理的地－井工作方式的三极（A极、M极和N极）梯度装置的测量方法。所谓地－井工作方式的三极梯度法，就是把一个供电电极A置于探井附近的地面上，而将另一供电电极B布置在“无穷远”处（约为井深的5～10倍），两个测量电机M、N保持固定距离在探井中逐点移动，测量出视电阻率值。该方法可根据油气藏的高阻特性，采用梯度异常分析，探测油气藏方位及边界。实验结果证明：它不仅能够有效地消除来自井何及地层中的各种干扰，而且较井－地工作方式的三极梯度法更有利于突出小块油气异常，可用于寻找分布面积仅为零点几到几个平方千米的小型高阻油气藏。在开发阶段可用来确定采空区附近的残余油及其赋存方位。
In this paper, through the simulation experiment of sink model, the measurement method of three-pole (A-pole, M-pole and N-pole) gradient device based on DC resistivity test is proposed. The terrestrial gradient method of so-called ground-well operation means that one power supply electrode A is placed on the ground near the exploration well and the other power supply electrode B is arranged at “infinity” (about 5 to 10 times the well depth) , Two measuring motors M, N maintain a fixed distance in the exploration wells by point to move, measured apparent resistivity value. According to the high resistivity of the reservoir, this method uses gradient anomaly analysis to detect the orientation and boundary of the reservoir. The experimental results show that it not only can effectively eliminate all kinds of interference from wells and formations, but also is more conducive to highlight the small hydrocarbon anomalies than the three-pole gradient method of well-ground working method. It can be used to find the distribution area of only zero A few to a few square kilometers of small high-resistance oil and gas reservoirs. In the development stage can be used to determine the residual oil near the goaf and its storage orientation.