Methane hydrate-bearing sediments: Pore habit and implications

Type Article
Date 2020-06
Language English
Author(s) Terzariol MarcoORCID1, Park Junghee2, Castro Gloria M.2, Santamarina J. Carlos2
Affiliation(s) 1 : IFREMER, Geosciences Marines, LAD, Plouzane, France
2 : Earth Science and Engineering, Building 5, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Source Marine And Petroleum Geology (0264-8172) (Elsevier BV), 2020-06 , Vol. 116 , P. 104302 (11p.)
DOI 10.1016/j.marpetgeo.2020.104302
WOS© Times Cited 39
Keyword(s) Hydrate accumulation database, Gas production, Methane hydrate pore habit, Revised soil classification system

Hydrate-bearing sediments are relevant to the organic carbon cycle, seafloor instability, and as a potential energy resource. Sediment characteristics affect hydrate formation, gas migration and recovery strategies. We combine the physics of granular materials with robust compaction models to estimate effective stress and capillary pressure in order to anticipate the pore habit of methane hydrates as a function of the sediment characteristics and depth. Then, we compare these results to an extensive database of worldwide hydrate accumulations compiled from published studies. Results highlight the critical role of fines on sediments mechanical and flow properties, hydrate pore habit and potential production strategies. The vast majority of hydrate accumulations (92% of the sites) are found in fines-controlled sediments at a vertical effective stress between σ′z = 400 kPa and 4 MPa, where grain-displacive hydrate pore habit prevails in the form of segregated lenses and nodules. While permeation-based gas recovery by depressurization is favored in clean-coarse sediments, gas recovery from fines-controlled sediments could benefit from enhanced transmissivity along gas-driven fractures created by thermal stimulation.

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