gamma-gamma methods
应用岩心地面自然伽马曲线与测井自然伽马曲线对比法对岩心进行归位，进而对岩心样品进行深度校正，在很大程度上提高了岩心资料的准确性。
Contrasting core ground gamma curve with logging gamma curve locate the core, and then emend the depth of the core sample, which improve veracity of the core data.
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