Ground-Truth Validation of T2 Estimates From Steady-State Surface NMR

Matthew P. Griffiths; Denys Grombacher; Seyyed Reza Mashhadi; Jakob Juul Larsen

doi:10.1029/2024GL112094

Ground-Truth Validation of T₂ Estimates From Steady-State Surface NMR

Matthew P. Griffiths^*, Denys Grombacher, Seyyed Reza Mashhadi, Jakob Juul Larsen

^*Corresponding author af dette arbejde

Institut for Geoscience
WATEC, Centre for Water Technology - WATEC Aarhus University Centre for Water Technology, C.F. Møllers Allé 4
Institut for Elektro- og Computerteknologi - Signal Processing and Machine learning - Edison
WATEC, Centre for Water Technology - WATEC Aarhus University Centre for Water Technology, Finlandsgade

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

Abstract

Steady-state sequences are a new protocol for surface nuclear magnetic resonance (NMR), that can yield high quality data in a short time. In addition to faster acquisition, steady-state surface NMR purports to measure the transverse relaxation time (Formula presented.), which is correlated with hydrogeological parameters like pore-size. This is in contrast to the effective transverse relaxation time (Formula presented.) associated with standard single pulse measurements, which may or may not be correlated with pore-size. While previous studies suggest that steady-state measurements have enhanced sensitivity to (Formula presented.), a ground-truth validation has not yet been done. We compare steady-state surface NMR results against borehole NMR logs at four locations. For relaxation regimes of (Formula presented.) > 10 ms, (Formula presented.) profiles from steady-state data are in excellent agreement with borehole measurements, provided the assumption of homogeneous horizontal layers is valid. Even in more complex geological environments, steady-state surface NMR delivers representative estimates of (Formula presented.).

Originalsprog	Engelsk
Artikelnummer	e2024GL112094
Tidsskrift	Geophysical Research Letters
Vol/bind	51
Nummer	24
ISSN	0094-8276
DOI	https://doi.org/10.1029/2024GL112094
Status	Udgivet - 28 dec. 2024

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10.1029/2024GL112094Licens: CC BY

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abstract = "Steady-state sequences are a new protocol for surface nuclear magnetic resonance (NMR), that can yield high quality data in a short time. In addition to faster acquisition, steady-state surface NMR purports to measure the transverse relaxation time (Formula presented.), which is correlated with hydrogeological parameters like pore-size. This is in contrast to the effective transverse relaxation time (Formula presented.) associated with standard single pulse measurements, which may or may not be correlated with pore-size. While previous studies suggest that steady-state measurements have enhanced sensitivity to (Formula presented.), a ground-truth validation has not yet been done. We compare steady-state surface NMR results against borehole NMR logs at four locations. For relaxation regimes of (Formula presented.) > 10 ms, (Formula presented.) profiles from steady-state data are in excellent agreement with borehole measurements, provided the assumption of homogeneous horizontal layers is valid. Even in more complex geological environments, steady-state surface NMR delivers representative estimates of (Formula presented.).",

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AU - Griffiths, Matthew P.

AU - Grombacher, Denys

AU - Mashhadi, Seyyed Reza

AU - Larsen, Jakob Juul

PY - 2024/12/28

Y1 - 2024/12/28

N2 - Steady-state sequences are a new protocol for surface nuclear magnetic resonance (NMR), that can yield high quality data in a short time. In addition to faster acquisition, steady-state surface NMR purports to measure the transverse relaxation time (Formula presented.), which is correlated with hydrogeological parameters like pore-size. This is in contrast to the effective transverse relaxation time (Formula presented.) associated with standard single pulse measurements, which may or may not be correlated with pore-size. While previous studies suggest that steady-state measurements have enhanced sensitivity to (Formula presented.), a ground-truth validation has not yet been done. We compare steady-state surface NMR results against borehole NMR logs at four locations. For relaxation regimes of (Formula presented.) > 10 ms, (Formula presented.) profiles from steady-state data are in excellent agreement with borehole measurements, provided the assumption of homogeneous horizontal layers is valid. Even in more complex geological environments, steady-state surface NMR delivers representative estimates of (Formula presented.).

AB - Steady-state sequences are a new protocol for surface nuclear magnetic resonance (NMR), that can yield high quality data in a short time. In addition to faster acquisition, steady-state surface NMR purports to measure the transverse relaxation time (Formula presented.), which is correlated with hydrogeological parameters like pore-size. This is in contrast to the effective transverse relaxation time (Formula presented.) associated with standard single pulse measurements, which may or may not be correlated with pore-size. While previous studies suggest that steady-state measurements have enhanced sensitivity to (Formula presented.), a ground-truth validation has not yet been done. We compare steady-state surface NMR results against borehole NMR logs at four locations. For relaxation regimes of (Formula presented.) > 10 ms, (Formula presented.) profiles from steady-state data are in excellent agreement with borehole measurements, provided the assumption of homogeneous horizontal layers is valid. Even in more complex geological environments, steady-state surface NMR delivers representative estimates of (Formula presented.).

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