阶跃侵入地层中，侵入带电阻率与地层电阻率比值小于0。
In step invasion formation, when the ratio of invasion resistivity to formation resistivity is less than 0.
利用阵列侧向测井提供的4条探测深度不同的曲线，联合反演侵入半径、侵入带电阻率和原状地层电阻率，具有很好的效果。
ALL can provide 4 logs that have different investigation depth. They can be used to inverse invasion radius, invasion zone resistivity and virgin zone resistivity.
为了在油气田开采中准确地判别油气层，根据阿尔奇公式的基本原理，探讨了用真电阻率与侵入带电阻率交会图判别油气层的方法。
According to the principle of Archie equation, this paper puts forword the method using Rt-Ri crossing plot to discriminate oil and gas reservoir.
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