In heavy oil, not only the absolute concentrations but also the ratio indicators of neutral nitrogen compounds are too low to distinguish the oil migration path.
重质油中，无论是中性含氮化合物的绝对浓度或是其比值指标都降低，严重影响了原油运移途径的判别。
Analysis of the results suggest that poststack depth migration has more advantages in improving S/N ratio, resolution and image effect than poststack time migration and prestack time migration.
对比分析了叠前深度偏移、叠后时间偏移和叠前时间偏移结果，分析表明，叠前深度偏移技术能较好地改善该区复杂构造的成像质量，提高资料的信噪比和分辨率。
In this paper, four different ratio groups of concrete specimens are tested, using NEL method which is based on ion diffusion and electrical migration.
配制四组不同混凝土配合比的试件，采用基于离子扩散和电迁移提出的NEL法对饱盐混凝土试件的氯离子扩散系数进行测定。
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