Chapter 8: NMR Log Quality Control

Quality control is essential to obtain accurate information for the NMR logs. A system of tool integrity and log quality indicators is used to ensure the highest level of data quality. The NMR log quality control procedure, in general, includes calibration, verification (before survey and after survey), operational setup, log recording, display of quality indicators, and a final quality check. The first part of this chapter examines quality control and is divided into five sections: concepts and definitions needed to understand the log quality assurance discussion, calibration and verification, quality control during logging, logging quality display, and post-logging quality check.