HR: 0800h
AN: MR11A-0916    [Abstracts]
TI: Calibration of Mobile NMR Instruments in Respect to Porosity and Pore Size Distribution of Drill Cores
AU: * Arnold, J
EM: j.arnold@geophysik.rwth-aachen.de
AF: Applied Geophysics, Aachen Technical University - RWTH, Aachen, 52065 Germany
AU: Anferova, S
EM: sanferova@mc.rwth-aachen.de
AF: Technical Chemistry and Macromolecular Chemistry, Aachen Technical University - RWTH, Aachen, 52056 Germany
AU: Anferov, V
EM: vanferov@mc.rwth-aachen.de
AF: Technical Chemistry and Macromolecular Chemistry, Aachen Technical University - RWTH, Aachen, 52056 Germany
AU: Pechnig, R
EM: r.pechnig@geophysik.rwth-aachen.de
AF: Applied Geophysics, Aachen Technical University - RWTH, Aachen, 52065 Germany
AU: Bluemich, B
EM: bluemich@mc.rwth-aachen.de
AF: Technical Chemistry and Macromolecular Chemistry, Aachen Technical University - RWTH, Aachen, 52056 Germany
AU: Clauser, C
EM: c.clauser@geophysik.rwth-aachen.de
AF: Applied Geophysics, Aachen Technical University - RWTH, Aachen, 52065 Germany
AB: The focus of our research is set on the calibration of two different and new developed light weight mobile NMR scanning systems: (1) the NMR-MOUSE and (2) the HALBACH device for measuring porosity and pore size distribution of different drill cores recovered from the International Ocean Drilling Program (IODP). Further goals are to adapt current NMR processing techniques, the development of new measurement routines, and to evaluate precision and accuracy of this method. Transverse relaxation on water-saturated drill cores were measured using a CPMG sequence. A regularized Laplace transform analysis based on the UPEN program yields the distribution of transverse relaxation times. The signal amplitudes and the integrals of distribution correlate directly to the core porosity. The main advantage of our mobile NMR scanning systems compared to conventional methods is their small size and weight, which is particularly attractive for the shipboard use and on any drilling platform envisioned for IODP. Both tools, the NMR-MOUSE and the HALBACH scanner are suitable for routine measurements of porosity and pore-size distribution of drill core sections. In contrast to the NMR-MOUSE, the HALBACH tool has a sufficiently homogeneous magnetic field and is more sensitive. It can determine porosities as low as 3 %. While the NMR-MOUSE can be applied on core sections of any geometry, the Halbach tool is especially designed for the size of standard drill cores recovered from the deep sea ocean floor by the IODP. Combined with a mobile NMR spectrometer and special software for porosity and pore size distribution measurements, both light and mobile devices are particularly attractive for the use on research vessels and logging platforms and thus alow to determine prosity and permeability on very fresh material.
DE: 5114 Permeability and porosity
DE: 5139 Transport properties
DE: 5194 Instruments and techniques
DE: 3929 NMR, Mossbauer spectroscopy, and other magnetic techniques
SC: Mineral and Rock Physics [MR]
MN: 2004 AGU Fall Meeting