Item talk:Q313030
From geokb
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"abstract": "Permeability is one of the most crucial properties governing fluid flow in methane hydrate reservoirs. This paper presents a comprehensive permeability analysis of hydrate-bearing sandy silt pressure-cored from Green Canyon Block 955 (GC 955) in the deep-water Gulf of Mexico. We developed an experimental protocol to systematically characterize the transport and petrophysical properties in pressure cores. The in situ effective permeability ranges from 0.1 md (1.0 \u00d7 10\u221216\u2009m2) to 2.4 md (2.4 \u00d7 10\u221215\u2009m2) in these natural sandy silts cores with hydrate occupying 83%\u201393% of the pore space. When hydrate dissociates from these cores, the measured intrinsic permeability (k0) is 0.3 md (3.0 \u00d7 10\u221216\u2009m2) to 9.3 md (9.3 \u00d7 10\u221215\u2009m2); these results are affected by fines migration during hydrate dissociation. We analyzed samples reconstituted from these sandy silts and found\u00a0k0\u00a0to range from \u223c12 md (\u223c1.2 \u00d7 10\u221214\u2009m2) to \u223c41 md (\u223c4.1 \u00d7 10\u221214\u2009m2). The water relative permeabilities (krw) of GC 955 pressure cores are large relative to other natural pressure cores from offshore Japan, offshore India, and onshore Alaska. These\u00a0krw\u00a0values are also higher than predicted by current conceptual relative permeability models where hydrate fills the pores or coats the grains of the sediments. This fundamental conundrum requires further study. Our work provides essential parameters to reservoir simulation models seeking to predict hydrate formation in geological systems, evaluate the gas production potential, and explore the best way to produce this energy resource in sandy silt reservoirs.",
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