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。
It has been proved that this method of migration has a lot of merits - high signal to noise ratio, no arc noise of migration and the high speed of calculation.
实线证明这种偏移具有讯噪比高、无偏移弧噪声和运算速度高等特点。
There is abundant precursory information of VP/VS ratio, seismogenic gap and seismic migration after1993 for analysis.
年以后波速比、孕震空区、地震迁移等可供分析的前兆信息很丰富。
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。
This paper USES the data from China Household Income Project (CHIP, 2002) to study the relationship between the ratio of rural non-agricultural labor and rural-urban migration.
本文使用CHIP(2002)的数据研究中国农村非农劳动力就业比例与农村劳动力向城市转移之间的对应关系。
The natural gas in the Ordovician of the central-eastern part of the basin is divided into four migration fields by using the data of carbon isotopic ratio in methane.
利用甲烷碳同位素资料将盆地中东部奥陶系天然气划分出四个运移场。
The natural gas in the Ordovician of the central-eastern part of the basin is divided into four migration fields by using the data of carbon isotopic ratio in methane.
利用甲烷碳同位素资料将盆地中东部奥陶系天然气划分出四个运移场。
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