Applications of Nuclear Magnetism Logging to Formation Evaluation

摘要: The nuclear magnetism log (NML) indicates the portion of fluids in porous rock that are free to flow. Thus, estimation permeability has been a major area NML application. other uses, however. In this paper, principles reviewed and examples three nonpermeability applications shown. can be used measure residual oil after nearwellbore region investigated by is flushed treated mud filtrate; distinguish producible water from heavy where salinities too low for confident resistivity interpretation; reduce ambiguity resulting shaliness identification gasbearing zones use density/neutron combination. Accuracy confidence interpretation enhanced reprocessing data digitally recorded when run. This particularly important low-level signals noise or interpret accurately decay rapidly. basis reviewed, signal displays shown each discussed.