![]() Program, Expedition 372.NMR logging, a subcategory of electromagnetic logging, measures the induced magnet moment of hydrogen nuclei (protons) contained within the fluid-filled pore space of porous media (reservoir rocks). The expedition report, Proceedings of the International Ocean Discovery Information about the drilling and logging operations can beįound in the Operations and Downhole Measurements sections of The scale is logarithmic, and T2 is given both in msec andĪs the log 10 of the time in msec, from 0 to 29 (because this is a KTIM (mD): Permeability from ProVISION (Timur model)Ģ) Files named ' t2dist.dat' contain the T2Įach depth, values of % volume are given for 30 relaxation times (T2) rangingįrom 3 to 3000 msec. The NMR data are presented in two ASCII files:ġ) Files named 'nmr.dat' contain the following 1-D The processing was performed by Schlumberger. In Expedition 372, the caliper log acquired by the NeoScope tool shows where the hole was enlarged and the CMR tool sensor may been more than 1 inch from the borehole wall. Like for other other tools, the caliper measurement can provide a good indication of the NMR data quality, as this is affected when the distance between the tool sensor and the borehole Proceedings of the Society of Professional Well Log Analyst Annual Logging Logging-while-drilling tool in a Gulf of Mexico deepwater development well: Scheibal, J.R., and Hashem, M., 2002, Applications of a new magnetic resonance ![]() Horkowitz, J., Crary, S., Ganesan, K., Heidler, R., Luong,ī., Morley, J., Petricola, M., Prusiecki, C., Speier, P., Poitzsch, M., Occurrence, Distribution, and Detection, American Geophysical Union, ![]() Used to assess gas-hydrate-bearing reservoirs: In Natural Gas Hydrates: See and for a more detailed description of the tool and its applications.Ĭollett, T.S., 2001, Review of well-log analysis techniques Porosity logs (such as density porosity). Indicated by the deviation of the magnetic resonance porosity log from other Within different ranges of T2, such as the bound and free fluid volumes. Processed to give the total pore volume (the total porosity) and pore volumes Is a distribution of T2 times, here given from 1 ms to 5 s. Pores, small pores, and bound in clay minerals, and in methane hydrate), there The decay of this signal is measured as the transverse relaxation time, T2.īecause the formation contains hydrogen in different forms (in water in large Precession of the hydrogen atoms induces a signal in the tool antenna, and The hydrogen atomsĪre then tipped by a short burst from an oscillating magnetic field that isĭesigned so that they precess in resonance in a plane perpendicular to B0. Initially, the hydrogen atoms areĪligned in the direction of a static magnetic field (B0). The proVISION tool used during Expedition 372 measures the nuclear magnetic resonance On the measurement of the relaxation time of the magnetically induced precession of Technology behind this tool is similar to modern wireline nuclear magnetic The measurement of nuclear magnetic resonance (NMR) made by Schlumberger's proVISION tool is summarized here. IODP Expedition 372 Nuclear Magnetic Resonance Data Processing
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