variable density logging

• 变密度测井

variable density logging的用法和样例：

例句

1. The density logger consists of a radiation source.
   密度测井仪包括辐射源。
2. In this paper, a new-style Gama Ray Spectrometry is developed, that is mainly used in natural Gama Ray Spectrometry Logging Instrument and Lithology Density Logging Instrument.
   本文设计了一种新型的伽马能谱仪，主要应用于自然伽马能谱测井和岩性密度测井。