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Pore‐Scale Controls on the Gas and Water Transport in Hydrate‐Bearing Sediments
Author(s) -
Li Guangyao,
Zhan Liangtong,
Yun Taesup,
Dai Sheng
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl086990
Subject(s) - clathrate hydrate , relative permeability , hydrate , permeability (electromagnetism) , clogging , pore water pressure , wetting , geology , aquifer , soil science , petroleum engineering , mineralogy , geotechnical engineering , porosity , groundwater , materials science , chemistry , membrane , composite material , biochemistry , organic chemistry , archaeology , history
Gas and water flow rates shape the economic feasibility of hydrate deposit exploration. However, pore‐scale controls on the gas and water transport as well as ensued impacts on gas production from hydrate deposits have not been well understood. This study uses 3D pore network modeling to understand the impacts of pore characteristics, hydrate, and hysteresis on two‐phase fluid transport in hydrate‐bearing sediments. The results highlight that drying and wetting are occurring simultaneously in sediments resulting in a nonunique water retention curve. The relative permeability to gas is governed by the coefficient of variance and the connectivity of pore size distribution in sediments. Parameter values for the modified Brook‐Corey relative permeability model are recommended considering preferential hydrate pore clogging habits.