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Deformation and failure of rock samples probed by T1 and T2 relaxation
C H van der Zwaag1, E Veliyulin, T Skjetne
1SINTEF, N-7465 Trondheim, Norway. Claas.v.d.Zwaag@npd.no
Magnetic Resonance Imaging
|July 10, 2003
Abstract:
The objective of the study was to pinpoint the effect of stress induced rock matrix alterations on NMR-wireline-log measurements by means of laboratory T1 and T2 relaxation time measurements. The research activities were subdivided into two major parts: NMR relaxation measurements on a brine saturated outcrop sandstone (Red Wildmoor Sandstone) during uniaxial compressional tests and NMR relaxation measurements on artificial sandstone samples prepared with defined crack patterns. T1-measurements performed on Red Wildmoor samples during compaction showed a decrease in the mean relaxation rate 1/exp