一种套管井测井方法，用于评价套管外注水泥作业。最常用的是水泥胶结测井。
A well log runs in a cased hole to evaluate the cement job behind the casing. The cement-bond log is the most common.
自然伽马测井测量的是地层总的自然伽马放射性，是套管井测井的一种最基本的方法。
What natural gamma well logging measured is total natural gamma radioactivity in layer, and it is a kind of most basic method in casing pipe well logging.
自然伽马测井是套管井测井中一种最基本的方法。它以地层自然放射性为基础，测井时用伽马射线探测器沿井眼进行测量。地层中的自然伽马放射性不是一成不变的。
Natural gamma logging is a kind of most basic methods of well logging in cased Wells which measure with gamma ray detector along well during logging.
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