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Estimation of Residual Pore Water Content in Hydrate-Bearing Sediments at Temperatures below and above 0 °C by NMRстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Bukhanov Boris, Chuvilin Evgeny, Mukhametdinova Aliya, Sokolova Natalia, Afonin Mikhail, Istomin Vladimir
- Журнал: Energy and Fuels
- Год издания: 2022
- Издательство: American Chemical Society
- Местоположение издательства: United States
- DOI: 10.1021/acs.energyfuels.2c03089
- Аннотация: Natural gas hydrates are considered as a high-potential source of unconventional hydrocarbons. Economically viable and environmentally safe production of gas sequestered in hydrates requires estimating the amount of liquid pore water that resides in hydrate-bearing sediments, including one in permafrost. In this work, we present results of estimating the content of residual pore water in gas hydrate reservoirs using nuclearmagnetic resonance relaxometry on a low-field NMR rock analyzer with a designed high-pressure core holder at pressures up to 8.0 MPa. The measurements are conducted on artificial samples of fine sand with inclusions of kaolinite and montmorillonite clay. The NMR results reveal thepresence of liquid pore water in all hydrate-bearing samples, with its content decreasing under increasing gas pressure and cooling. The content ofresidual pore water approaches the calculated amount of nonclathrated water, the minimum for hydrate-bearing media, in samples exposed torepeated heating−cooling cycles. Results confirm that samples with higher percentages of clay (especially montmorillonite) contain more residual pore water, which varies from <0.2 wt % in pure sand to 5.0 or 6.8 wt % (at −5.5 and +2.5 °C, respectively) in a mixture of sand with 25 wt % of montmorillonite clay. It is also noted that the content of residual water is sensitive to initial moisture content and residual ice content in permafrost hydrate-bearing reservoirs.
- Добавил в систему: Чувилин Евгений Михайлович