Studies of fluid transport in porous rocks by echo-planar MRI

P. Mansfield, B. Issa

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Attempts to quantify the permeability constant that appears in Darcy's equation in terms of the porosity, tortuosity and surface area have been made by Kozeny and Carman. These results in turn have been translated by Seevers into expressions involving spin-lattice relaxation times. When this work was done originally in the mid-1960s, NMR imaging and spatially localised T1 maps had not been invented. Therefore, bulk T1 average values were used and it is not surprising to see substantial deviations from predicted permeabilities in bore core material. In this paper we re-examine the Kozeny-Carman and Seevers theories in the light of new techniques development for the localised measurement of both T1 maps and fluid velocity maps. New results show spatially correlated T1 and flow maps obtained from Bentheimer sandstone samples. These are discussed in terms of a localised permeability constant. By this means we show that the relationship between T1 and permeability does not hold at the local level for isolated pixels within a larger specimen.

Original languageEnglish
Pages (from-to)275-278
Number of pages4
JournalMagnetic Resonance Imaging
Volume12
Issue number2
DOIs
Publication statusPublished - 1994
Externally publishedYes

Keywords

  • EPI
  • Fluid transport
  • Porous rocks

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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