以下为句子列表：
英文: The sonic logging is applied to the correction of density logs in condition of less distortion of compensated sonic logs; the density logging is used to the correction of logs in the case of severe distortion of sonic and density logs.
中文: 前者主要应用在补偿声波失真较小情况下密度测井曲线的校正，后者应用于声波、密度都出现严重失真情况下的曲线校正。
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