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本文在三极梯度法的基础上提出了一种寻找高阻油气藏的直流电阻率勘探方法──三极剖面法。该方法是在地面上布设测量电极，一个供电电极置于无穷远处，另一个供电电极和两个测量电极始终保持一个固定的距离，沿测线逐点移动进行视电阻率测量。理论分析和实际的水槽模拟实验表明：该方法和三极梯度法一样，能够有效地消除各种干扰，突出油气藏异常，圈定其边界位置。该法还能利用老油气区众多油气井及探井套管作电极，对老区深层油气藏或高阻屏蔽层下面的油气藏进行预测。
Based on the three-pole gradient method, this paper presents a method of prospecting for DC resistivity of high-resistivity reservoirs ─ ─ Tripole Profile Method. In this method, measuring electrodes are laid on the ground. One power supply electrode is placed at infinity. The other power supply electrode and the two measuring electrodes are always kept at a fixed distance, and the apparent resistivity is measured point by point along the measuring line. Theoretical analysis and actual sink simulation show that this method, like the three-pole gradient method, can effectively eliminate all kinds of disturbances, highlight the abnormalities of reservoirs and delineate their boundary positions. The method can also use the many oil and gas wells in the old oil and gas wells and exploration wells as the electrode to predict the reservoirs under the deep reservoirs or high-resistance shields in the old areas.