Its structure is quite complex, fault block well developed, lithology complex, formation water salinity variable and oil zones universally exhibit low resistivity.

其油藏结构复杂、断块发育、岩性与水性复杂多变，同时油层低阻现象普遍。

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The rotor of bulb tubular hydro generating unit adopts cantilever structure. The whole machine was installed under water with low rotation speed and more magnetic poles.

灯泡贯流式水轮发电机转子采用悬臂式结构，整个机组安装在水里，机组转速低，磁极对数多，励磁回路发生接地的故障机率较大，而产生的后果严重。

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Because of complex pore structure in low permeability sandstone reservoir, it was quite difficult to identify oil or water layer and evaluate reservoir using normal methods.

低渗透砂岩油藏因其孔隙结构复杂，利用常规方法进行油水层识别和储层评价难度较大。

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