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 language | English |
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State | Published - 1 Jan 1993 |
Externally published | Yes |
Event | SPWLA 34th Annual Logging Symposium - Calgary, Canada Duration: 13 Jun 1993 → 16 Jun 1993 |
Conference
Conference | SPWLA 34th Annual Logging Symposium |
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Country/Territory | Canada |
City | Calgary |
Period | 13/06/93 → 16/06/93 |
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Energy Engineering and Power Technology