Premium
Multiecho scheme advances surface NMR for aquifer characterization
Author(s) -
Grunewald Elliot,
Walsh David
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2013gl057607
Subject(s) - t2 relaxation , characterization (materials science) , logging , aquifer , well logging , nuclear magnetic resonance , relaxation (psychology) , computer science , materials science , geology , biological system , magnetic resonance imaging , physics , geophysics , nanotechnology , groundwater , geotechnical engineering , radiology , medicine , ecology , biology , psychology , social psychology
Surface nuclear magnetic resonance (NMR) is increasingly used as a method to noninvasively characterize aquifers. This technology follows a successful history of NMR logging, applied over decades to estimate hydrocarbon reservoir properties. In contrast to logging, however, surface methods have utilized relatively simple acquisition sequences, from which pore‐scale properties may not be reliably and efficiently estimated. We demonstrate for the first time the capability of sophisticated multiecho measurements to rapidly record a surface NMR response that more directly reflects aquifer characteristics. Specifically, we develop an adaptation of the multipulse Carr‐Purcell‐Meiboom‐Gill (CPMG) sequence, widely used in logging, to measure the T 2 relaxation response in a single scan. We validate this approach in a field surface NMR data set and by direct comparison with an NMR log. Adoption of the CPMG marked a landmark advancement in the history of logging NMR; we have now realized this same advancement in the surface NMR method.