Victoria University

Advanced NMR methodologies in rock core analysis

ResearchArchive/Manakin Repository

Show simple item record

dc.contributor.advisor Galvosas, Petrik
dc.contributor.advisor Dykstra, Robin Liu, Huabing 2016-01-05T03:19:22Z 2016-01-05T03:19:22Z 2015 2015
dc.description.abstract ¹H NMR techniques have gained extensive acceptance in petrophysics for the evaluation of fluid-saturating reservoir rocks. This thesis presents the development of new NMR methods regarding the reserves (determination of pore length scales and surface relaxivities), productivity (estimates of permeability) and recovery of fluids (resolves of saturation evolution) in rocks. Traditionally, pore lengths are evaluated from the ground relaxation eigenmodes of spin-bearing molecules in pore space. This evaluation is not straightforward since it is affected by surface relaxivity. Here, we use an approach to determine pore length from detecting the high relaxation eigenmodes, in which way the eigenvalue spectrum directly scales to the pore size distribution. Based on this, we extend this approach for the use with low-field NMR spectrometers and 2D NMR eigenmode correlation methods. Surface relaxivity can be further extracted from these 2D correlation maps, which is in agreement with an independent NMR measurement. Permeability is generally estimated from surface relaxation via empirical pore-network models. However, for heterogeneous rocks a single (or averaged) permeability value may not be adequate. Therefore, we measure surface relaxation in conjunction with MRI techniques. Permeability profiles can then be obtained from spatially resolved relaxation maps yielding local connectedness between adjacent slices. The results are confirmed by the comparison of brine-permeability measurements. MRI experiments of fluids in rocks at reservoir-like conditions may yield optimized recovery strategies of reservoir fluids. In this context we combine MRI with diffusion-relaxation correlation measurements during flooding intervals. The results provide substantial information, such as flooding front and saturation profiles of immiscible fluids discriminated by fluid type. en_NZ
dc.language.iso en_NZ
dc.publisher Victoria University of Wellington en_NZ
dc.subject NMR en_NZ
dc.subject MRI en_NZ
dc.subject Rock core analysis en_NZ
dc.title Advanced NMR methodologies in rock core analysis en_NZ
dc.type Text en_NZ
vuwschema.contributor.unit School of Chemical and Physical Sciences en_NZ
vuwschema.contributor.unit Macdiarmid Institute for Advanced Materials and Nanotechnology en_NZ
vuwschema.type.vuw Awarded Doctoral Thesis en_NZ Physics en_NZ Victoria University of Wellington en_NZ Doctoral en_NZ Doctor of Philosophy en_NZ
dc.rights.license Author Retains All Rights en_NZ 2015-12-18T02:57:33Z
vuwschema.subject.anzsrcfor 020699 Quantum Physics not elsewhere classified en_NZ
vuwschema.subject.anzsrcseo 850103 Oil and Gas Exploration en_NZ
vuwschema.subject.anzsrctoa 3 APPLIED RESEARCH en_NZ

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ResearchArchive

Advanced Search


My Account