The resistivity of local flushed zone may be higher than the virgin zone resistivity and a low resistive zone appears in invading zone in the oil formation.

• 淡水钻井液侵入造成井眼周围储层电阻率分布复杂，局部冲洗带电阻率可能要高于原状地层电阻率，从而出现低阻环带特征。