Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Two-dimensional NMR relaxometry study of pore space characteristics of carbonate rocks from a Permian aquifer
Autor Schoenfelder, W.; Gläser, H.-R.; Mitreiter, I.; Stallmach, F.;
Journal / Serie Journal of Applied Geophysics
Erscheinungsjahr 2008
Department HDG;
Band/Volume 65
Heft 1
Sprache englisch;
Keywords Carbonate rock; Porosity classification; Tortuosity; NMR; Mercury intrusion porosimetry
Abstract Limestones and karstified limestones (dolostones) from a Permian aquifer in Central Germany were studied by 1H 2D NMR relaxometry and PFG NMR diffusometry, aiming at a non-destructive characterization of the pore space. Information concerning pore size distribution and water diffusion were in accord for different samples of each type of rock, but differed fundamentally between limestones and dolostones.The results of the 2D relaxometry measurements revealed a ratio of surface relaxation times T1/T2 of about 2 for the limestones and about 4.5 for the dolostones, mirroring the different content of iron and manganese in the solid pore walls. In consideration of thin section interpretation, the corresponding fraction in the T1-T2 relaxation time distributions was attributed to interparticle porosity. Porosity of large vugs is clearly displayed by relaxation times longer than 1 s in the dolostones only. A third fraction of the total water-saturated pore space in the dolostones, which is clearly displayed in the 2D relaxation time distributions at the smallest relaxation times and a T1/T2 ratio of about 12, is attributed to intrafossil porosity. The porosity classification, basing on non-destructive NMR experiments, is verified by mercury intrusion porosimetry and thin section interpretation.
ID 1423
dauerhafte UFZ-Verlinkung http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=1423
Schoenfelder, W., Gläser, H.-R., Mitreiter, I., Stallmach, F. (2008):
Two-dimensional NMR relaxometry study of pore space characteristics of carbonate rocks from a Permian aquifer
J. Appl. Geophys. 65 (1), 21 - 29