Especially emphasizes that siderite has no apparent effect on formation resistivity.
特别强调指出局部发育的菱铁矿对该区地层电阻率无明显影响。
In step invasion formation, when the ratio of invasion resistivity to formation resistivity is less than 0.
阶跃侵入地层中，侵入带电阻率与地层电阻率比值小于0。
A new spontaneous potential log model for the case when formation resistivity is not piece - wise constant was introduced.
针对非均质地层中电阻率非分块常数，提出一个新的自然电位测井模型。
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