Characterization of pore microgeometry by nmr diffusion measurements

P. N. Tutijnjian, H. J. Vinegar, J. A. Ferris, G. J. Nesbitt

Research output: Contribution to conferencePaperpeer-review

5 Scopus citations

Abstract

lH Pulsed-Field Gradient NMR has been used to measure the restricted diffusion coefficient of water in Bentheim sandstone. The low q condition (q is proportional to gS where g is the gradient strength and 6 is its duration) is essential for diffraction-based interferences to be minimized and for simple exponential fitting of NMR signals to accurately calculate in situ diffusion coefficients. Deviations from non linear behavior at high q values estimate the mean interpore distance. The short time behavior of the restricted diffusion coefficient yields the surface-to-volume ratio of the pore space, while the long time behavior estimates the tortuosity and the average pore size. NMR-based average pore size, interpore distance and surface-to-volume ratio are combined with grain size distribution and mercury capillary pressure data to more fully characterize the pore microgeometry in Bentheim sandstone.

Original languageEnglish
StatePublished - 1 Jan 1993
Externally publishedYes
EventSPWLA 34th Annual Logging Symposium - Calgary, Canada
Duration: 13 Jun 199316 Jun 1993

Conference

ConferenceSPWLA 34th Annual Logging Symposium
Country/TerritoryCanada
CityCalgary
Period13/06/9316/06/93

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

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