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CHAPTER 2

NMR Well Logging

The technique of NMR well logging is a commercial service that identifies and quantifies the nature of fluids occupying the pore space of rock formations in the vicinity around a bore hole. It is based on NMR relaxation and diffusion measurements with special-purpose sensors that are lowered into boreholes and are capable of making measurements on samples located completely outside the apparatus. The sensors for these inside-out measurements are built to withstand the extreme environmental conditions (temperature, pressure and shock) and incorporate all the essential components for an NMR measurement, including permanent magnet, rf transmitter, receiver and other necessary electronics. The chapter gives an overview of the technique and its applications. It includes a discussion of the various hardware configurations and measurement techniques that have been specifically developed for this application and addresses challenges related to calibration and data inversion. There is also a brief summary of the underlying physics of diffusion and relaxation in porous media and in complex fluids that connects the measured NMR quantities to the essential petrophysical quantities of interest. Representative logging examples are used to illustrate the wide-ranging applications of NMR well logging.

Print publication date: 27 Oct 2015
Copyright year: 2016
Print ISBN: 978-1-84973-915-3
PDF eISBN: 978-1-78262-809-5
ePub eISBN: 978-1-78262-745-6
Citation:
From the book series:
New Developments in NMR