COMPARING NMR RESPONSES IN A WELLBORE OF DIFFERENT RADIAL DEPTHS OF INVESTIGATION

摘要

A method for detecting hydrocarbon-bearing zones or fines invasion in a formation penetrated by a wellbore includes acquiring at least two nuclear magnetic resonance measurements, each of the at least two nuclear magnetic resonance measurements acquired from a volume of investigation at a different radial depth from the wellbore; and determining whether the formation bears hydrocarbons or the occurence of fines invasion by comparing the at least two nuclear magnetic resonance measurements.