In a water flooded sandstone oilfield, keeping a reasonable formation pressure is important for both the development effect and the total development benefit.
对于注水开发砂岩油田，保持合理的地层压力既关系到油田开发效果，又影响到油田开发总体效益。
So that a large amount of low-mature oil was generated and subsequently migrated into sandstone belt with first secondary porosity created by the formation water released from clays.
这样，大量低成熟石油能够生成，并随着粘土释放出的层间水运移到砂岩的第一次生孔隙密集在中。
The alterations in the formation of the phreatic water oxidation sandstone type uranium deposits can be divided into two types.
酸碱度和氧化还原电位是对砂岩型铀矿后生蚀变水溶液中铀溶解和沉淀有较大影响的两个因素。
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