GeoSpec models for routine measurements of relaxation distributions generally operate at 2MHz, in order to reduce artefacts caused by ferromagnetic material in the samples, and to mimic the operation of the NMR logging tools. Higher field versions are also available for special applications. GeoSpec instruments are available in three different magnet sizes, to accommodate cores of different diameter from 1” up to full core.
All GeoSpec2 models are equipped with Q-Sense, Oxford Instruments’ ground-breaking new technology for improved signal-to-noise and ultra-short echo times – both features essential for accurate measurements on tight rocks and shales.
All GeoSpec models are fully integrated with specialist core analysis software from Green Imaging Technologies, which takes full control of the instrument hardware and automatically generates BVI, FFI, CBW, effective porosity, T1 and T2 cut-off values and NMR permeability. Further hardware and software options are available, exclusively on the GeoSpec range, to measure capillary pressure (Pc) using the patented GIT-CAP technique. This technique allows Pc measurements to be made in a fraction of the time taken by traditional centrifuge and porous plate techniques, and with many more data points, thus allowing more accurate prediction of additional parameters such as pore throat distributions, wettability and relative permeability.