Comparison of 2MHz and 12MHz NMR Rock Core Analysis

This technical note presents a comparison between 2MHz and 12MHz Nuclear Magnetic Resonance (NMR) rock core analysis systems. It outlines the historical context of NMR laboratory analysis, which has predominantly utilized 2MHz instruments for over two decades, primarily for calibrating well logs. However, advancements in NMR technology have led to a shift towards higher frequency systems, specifically the 12MHz GeoSpec, which offers significant advantages in sensitivity and measurement speed. The study conducted by the University of Oklahoma’s Mewbourne School of Petroleum and Geological Engineering compares the NMR responses of various rock samples using both systems. The findings indicate that the 12MHz system captures approximately 15 times more NMR signal, resulting in a higher signal-to-noise ratio (SNR) and improved resolution in T2 spectra. The note also discusses the implications of these findings for porosity measurements and the creation of 2D correlation maps, emphasizing the benefits of using the 12MHz GeoSpec for enhanced data quality and analysis efficiency.