想问一下现在分析化验孔隙度到底有多准？
一般井下孔隙度来源有以下几种，岩心常规分析，压汞，ECS测井等，但是哪一种更准确？原因是什么？
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说一下新问题
了解到有些实验室做分析是用煤油做的孔隙度，这样的话对于常规储层可能能得到实际的有效孔隙度，但是对于致密储层，尤其是现在所提的纳米级孔隙的储层是不是偏低？偏低简直是肯定的，但是偏低多少呢？1%？依据是什么？
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再一个新问题
看到一个资料，说是一般油气分子直径不会大于2nm，而水膜厚度约43nm。
问题是
这个水膜厚度与什么有关？还是不管什么岩性基本都是这么厚的水膜？或者如果是源岩或者有机孔隙的亲油的那种，就可以不考虑水膜？
