Dipolar NMR relaxation of adsorbates on surfaces of controlled wettability

作     者：Siegfried Stapf Igor Shikhov Christoph Arns Bulat Gizatullin Carlos Mattea Siegfried Stapf;Igor Shikhov;Christoph Arns;Bulat Gizatullin;Carlos Mattea

作者机构：Department of Technical Physics IIUniversity of Technology IlmenauPO Box 10056598684IlmenauGermany School of Minerals and Energy Resources EngineeringUniversity of New South WalesSydneyNSW2052Australia 

出 版 物：《Magnetic Resonance Letters》 (磁共振快报（英文）)

年 卷 期：2023年第3卷第3期

页      面：220-231,I0003页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：the Deutsche Forschungsgemeinschaft(STA 511/15-1 and STA 511/15-2)is gratefully acknowledged 

主　　题：Rocks Wettability Relaxometry NMR DNP Oil 

摘      要：In reservoir rocks,the term“ageingrefers to extended exposition to crude oil;a typically water-wet sandstone will then gradually become oil-wet as a consequence of the deposition of insoluble fractions of oil onto the surface *** have been aged artificially by subjecting them to a bitumen solution at elevated temperature in order to achieve comparable surface properties for three different types of rock:Bentheimer,Berea Buff and Liege *** saturated and aromatic model compounds as proxies for crude oil,the nuclear magnetic resonance(NMR)relaxation dispersion in native and aged rocks was compared and correlated to the properties of paramagnetic impurities in these rock *** liquids were found to follow the same trend as deuterated and naturally occurring oil components,suggesting they can be used as suitable tracers for wettability studies since the ^(19)F nucleus is absent in natural *** combining electron paramagnetic resonance(EPR)and dynamic nuclear polarization(DNP)it becomes possible to identify and quantify the origin of the dominating relaxation processes between native and aged rocks,providing an alternative approach to assess wettability in natural rocks.