当地层水含盐量较高时，水的体积光电吸收指数与油(气)的体积光电吸收指数相差较大。
When salinity of formation water is rather high, the volumetric photoelectric absorption index of water and that of oil (gas) are quite different.
光电效应是光电吸收截面指数（PEF）测井的测量原理，PEF测井用来划分岩性。
The photoelectric effect is the principle behind the PEF log, which identifies lithology.
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