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.
流体含水测井曲线出现异常，曲线幅度变化与流体密度曲线正好相反；
Fluid identification logging curve is abnormal, the curve amplitude change is inversed with the fluid density curve;
流体含水测井曲线出现异常，曲线幅度变化与流体密度曲线正好相反；
Fluid identification logging curve is abnormal, the curve amplitude change is inversed with the fluid density curve;
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