Deformation and failure of rock samples probed by T1 and T2 relaxation |
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| Authors: | van der Zwaag C H Veliyulin E Skjetne T Lothe A E Holt R M Nes O M |
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| Institution: | SINTEF, N-7465 Trondheim, Norway. Claas.v.d.Zwaag@npd.no |
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| 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
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