减沙效益低值区的治理度小于15%时，基本没有减沙效益。
When control degree in the low benefit zone is less than 15%, there is almost no sediment reduction benefit.
能谱测量的低值区范围与已知油田在本区的面积重合率达75%。
The low value range of Y-ray spectrometry covers 75% of the area of known oil field.
这些应力的低值区，非常有利于矿液和油气的运移、聚集和成藏。
In these regions the state of lower stress is favorable for the migration, accumulation and precipitation of mineral liquids and oil gas.
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