The Mythologies of NMR Log Calibration

By September 29, 2014Technical Meetings

Dr. Paul Basan was born at Union city, Tennessee on January 8, 1943 and grew up in Southern Indiana.  He received a Bachelors degree in geology from Indiana University in 1965, and then served 2 years in the US Army as a chemical, biological, and radiological officer.  After military service, Paul completed his Masters degree in carbonate sedimentology at the State University of New York, Binghamton, in 1970.

Subsequently, in 1974, he received a doctorate in paleo-ecology and ichnology from the University of  Georgia. Dr. Paul is presently Director at Reservoir Rock Typing ((K) Ltd where is works on NMR log acquisitions parameters, LQC and data interpretation.  He also manages and works on reservoir characterisation projects that include rock typing.  Additionally, Paul is the owner/instructor for the PetroSkills NMR petrophysics course.

Dr. Paul’s technical activities, over the last 42  years, varied from sedimentology and petrophysics to drilling engineering and formation damage.  His interest in NMR technology, which dates back to 1992, resulted in global catalogues for NMR response, protocols for NMR core analysis, and the development of  NMR log analysis software.  Today, Paul not only works to guide the technical direction of Corex, but also conducts projects and acts NMR advisor for several oil companies.


NMR core analysis data has multiple applications that support both formation evaluation and reservoir characterisation.  Log calibration is one of the applications; providing a benchmark for predicting rock types is another.  This presentation concentrates on the common misconceptions surrounding the validation of NMR log data.

Myth 1. All NMR logs require core for calibration. 

Myth 2. Laboratory T2 cutoffs provide the necessary value for NMR log calibration. 

Myth 3. NMR log calibration always requires reservoir-condition core analysis.

Myth 4. It is not important to include log data in core calibration projects. 

Myth 5.Knowing the quality of NMR log is not essential the before spending money on NMR core calibration.

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