一种普查勘探油气藏的间接型电阻率法──三极剖面法

Trielectrode profiling method: an indirect DC resistivity method for hydrocarbon resources reconnaissance

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。

Trielectrode profiling method, whick is a DC resistivity method for locatinghigh-resistance hydrocarbon reservoir, is put forward on the basis of trielectrodegradient method. In this new method, all electrodes are planted on ground surface.To speak exactly, one power supply electrode is planted at 'infinite far' point, andthe another one keeps a constant distance with observation electrodes M and N(They move along survey line one station by one station in resistivity observation).Theoretical analysis and water trough modeling show that as is seen in trielectrodegradient method, the new method removes effectively various noises, highlightsanomaly relating to hydrocarbon reservoir, and locates reserv0ir boundary. In addition, by using the new method in old oil fields, people can use multitudinous borehole casing pipes as electrodes to predict both deep hydrocarbon reservoir and thereservoirs which underlie high-resistance shielding beds.