Influence of Rock Wettability on THF Hydrate Saturation and Distribution in Sandstones

Natural gas trapped in hydrate deposits is a potentially enormous source of energy which can principle be extracted from the underground reservoir structures. These reserves also catastrophically release very large quantities greenhouse gases to atmosphere. One key parameter well known strongly influence fluid distribution, saturation, and production rock wettability. However, effect wettability on sediments has not been investigated yet. We thus used nuclear magnetic resonance (NMR) spectrometry measure relaxation times (T2 T1) corresponding surface relaxivity tetrahydrofuran during formation dissociation water- oil-wet Bentheimer sandstones. measured NMR porosities saturations at different temperatures formation/dissociation for both water-wet Significantly higher saturation was observed sandstone (when compared sandstone) all stages dissociation. Furthermore, T2 spectra moved lower domain (before formation) fast (after generally had range due water affinity associated faster demagnetization molecules. results demonstrate that low-field quantify observe behavior geologic sediments. This fundamental information aids development extraction reservoirs assessment potential emissions such into