dc.contributor.author | Niu, Qifei | |
dc.contributor.author | Zhang, Chi | |
dc.date.accessioned | 2019-11-15T17:25:29Z | |
dc.date.available | 2019-11-15T17:25:29Z | |
dc.date.issued | 2017-11-23 | |
dc.identifier.citation | Qifei Niu, Chi Zhang, Joint inversion of NMR and SIP data to estimate pore size distribution of geomaterials, Geophysical Journal International, Volume 212, Issue 3, March 2018, Pages 1791–1805, https://doi.org/10.1093/gji/ggx501 | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/29774 | |
dc.description.abstract | There are growing interests in using geophysical tools to characterize the microstructure of
geomaterials because of the non-invasive nature and the applicability in field. In these applications,
multiple types of geophysical data sets are usually processed separately, which
may be inadequate to constrain the key feature of target variables. Therefore, simultaneous
processing of multiple data sets could potentially improve the resolution. In this study, we
propose a method to estimate pore size distribution by joint inversion of nuclear magnetic
resonance (NMR) T2 relaxation and spectral induced polarization (SIP) spectra. The petrophysical
relation between NMR T2 relaxation time and SIP relaxation time is incorporated in
a nonlinear least squares problem formulation, which is solved using Gauss–Newton method.
The joint inversion scheme is applied to a synthetic sample and a Berea sandstone sample. The
jointly estimated pore size distributions are very close to the true model and results from other
experimental method. Even when the knowledge of the petrophysical models of the sample is
incomplete, the joint inversion can still capture the main features of the pore size distribution of
the samples, including the general shape and relative peak positions of the distribution curves.
It is also found from the numerical example that the surface relaxivity of the sample could be
extracted with the joint inversion of NMR and SIP data if the diffusion coefficient of the ions
in the electrical double layer is known. Comparing to individual inversions, the joint inversion
could improve the resolution of the estimated pore size distribution because of the addition of
extra data sets. The proposed approach might constitute a first step towards a comprehensive
joint inversion that can extract the full pore geometry information of a geomaterial from NMR
and SIP data. | en_US |
dc.publisher | Oxford University Press | en_US |
dc.rights | © The Author(s) 2017. Published by Oxford University Press on behalf of The Royal Astronomical Society. | en_US |
dc.subject | electrical properties | en_US |
dc.subject | magnetic properties | en_US |
dc.subject | microstructure | en_US |
dc.subject | hydrogeophysics | en_US |
dc.subject | Joint Inversion | en_US |
dc.title | Joint inversion of NMR and SIP data to estimate pore size distribution of geomaterials | en_US |
dc.type | Article | en_US |
kusw.kuauthor | Zhang, Chi | |
kusw.kuauthor | Niu, Qifei | |
kusw.kudepartment | Geology | en_US |
dc.identifier.doi | 10.1093/gji/ggx501 | en_US |
kusw.oaversion | Scholarly/refereed, author accepted manuscript | en_US |
kusw.oapolicy | This item meets KU Open Access policy criteria. | en_US |
dc.rights.accessrights | openAccess | en_US |