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一、引言 在地层与地层、井壁与地层之间由于电化学作用在井内和地层中产生了自然电场。自然电位测井是用置于井筒内的点电极测出的自然电位曲线来划分油水层及确定地层水电阻率等。在油田开发时将大量淡水注入地层,地层水淹后矿化度下降,自然电位曲线幅度降低,因此在调整井测井解释时如何划分薄油层和水淹层已成为油田开发中急待解
I. INTRODUCTION Natural electric fields are generated in the well and in the formation due to the electrochemical action between the formation and the formation, between the wall and the formation. Natural potential logging is the natural potential curve measured by the point electrode placed in the wellbore to divide the oil-water layer and determine the formation water resistivity. When a large amount of fresh water is injected into the formation during oilfield development, the degree of salinity decreases and the natural potential curve decreases. Therefore, how to divide thin oil layers and water flooded layers when adjusting well logging interpretation has become an urgent problem in oilfield development