低密度井眼流体会对补偿中子孔隙度测井产生井眼挖掘效应，使视孔隙度值低于真孔隙度，且井眼流体密度越小，井眼尺寸越大，地层孔隙度越大，井眼挖掘效应越明显。
The low density drilling fluid has borehole excavation effect on compensated neutron porosity logging, and by this way apparent porosity is lower than the true value.
被视做原子核中基本组成粒子的中子或质子。
NEUTRON or PROTON viewed as a fundamental constituent PARTICLE within the atomic NUCLEUS.
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