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电法测井有很高的分辨率,但是它的探测半径仅限于井孔周围;井-地电位技术虽然可以探测到足够大的范围,但是它的分辨率却受到很大的限制,特别是对于油水分布或者结构复杂的储层。本文试图通过井-地电位技术和井间电位技术的联合来研究地下储层油水分布范围。具体方法是,采用井-地电位技术研究油水分布在在横向上的展布情况,利用井间电位技术研究油水储层在垂向上的分布,然后采用井间电位结果标定井地电位结果,两者结合提高纵向分辨率,从而确定剩余油的三维空间分布。研究中通过研究注水初期数值模拟结果与水淹期数值模拟结果之差,求取剩余油分布范围。有限差分方法数值模拟表明:井-地电位技术与井间电位技术联合方法可以有效地确定剩余油分布。
Electro-Logging has high resolution, but its detection radius is limited to around the borehole; well-ground potential technology can detect a large enough range, but its resolution is greatly limited, especially For oil and water distribution or complex reservoir. This paper attempts to study the distribution of oil and water in underground reservoirs by combining the well-ground potential technique with the crosswell potential technique. The specific method is to study the distribution of oil and water in the horizontal direction by using the well-ground potential technique, study the vertical distribution of the oil-water reservoir by using the crosswell potential technique, and then calibrate the well-ground potential result by using the cross-well potential result. In combination with increasing the vertical resolution, the remaining three-dimensional spatial distribution of oil is determined. In the study, the difference between the numerical simulation results in the initial stage of water flooding and the numerical simulation results in the flooding stage was studied to determine the remaining oil distribution range. The finite difference method numerical simulation shows that the combination of well-ground potential technique and cross-well potential technique can effectively determine the residual oil distribution.