问答题 翻译：Further out from the borehole, the displacement of the formation fluids by the mud filtrates is less and less complete, resulting in a transition from mud filtrate saturation to original formation water saturation. This zone is referred to as the transition or invaded zone.

问答题 翻译：Measuring (gauging) and testing crude oil in the field is not a typical repetitive operation.

问答题 翻译：Formation fluid or pore pressures are frequently classified into three categories, subnormal, normal and abnormal.