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| 自然伽马测井 | |||
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| 天然伽马射线测井 | |||
| 自然伽马测井沿孔壁测量岩层的自然 γ 射线强度,以研究岩层划分和地层对比等的测井方法 | |||
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natural gamma ray log : 5 phrases in 3 subjects |
| Drilling | 1 |
| Geophysics | 3 |
| Oil / petroleum | 1 |
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