Author Identifier

Alireza Keshavarz

ORCID : 0000-0002-8091-961X

Stefan Iglauer

ORCID : 0000-0002-8080-1590

Document Type

Journal Article

Publication Title

The Journal of Physical Chemistry C

Publisher

American Chemical Society Publications

School

School of Engineering / Centre for Sustainable Energy and Resources

RAS ID

36315

Funders

Edith Cowan University - Open Access Support Scheme 2021

Higher Education of Pakistan Ministry

Dawood University

Comments

Abbasi, G. R., Al-Yaseri, A., Isah, A., Keshavarz, A., & Iglauer, S. (2021). Influence of rock wettability on THF hydrate saturation and distribution in sandstones. The Journal of Physical Chemistry C, 125(31), 17323-17332. https://doi.org/10.1021/acs.jpcc.1c03940

Abstract

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

DOI

10.1021/acs.jpcc.1c03940

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Share

 
COinS