=== Auxiliary Material ===
Preferential Mode of Gas Invasion in Sediments: Grain-Scale Mechanistic Model of Coupled Multiphase Fluid Flow and Sediment Mechanics.<
>A. K. Jain and R. Juanes. ''Journal of Geophysical Research'', '''114''', B08101 (2009), doi:10.1029/2008JB006002. ([[attachment:publications/jain_juanes_jgr_2009.pdf|pdf|&do=get]])
This movie shows the
propagation of a fracture during gas invasion into fine-grained
media, as predicted by our grain-scale model. The grains,
assumed to be spherical, are shown in yellow. The initial
configuration is obtained by settling the particles and
compacting them to a desired confining stress. Initially, the
pack is filled with brine. At time 0, gas invades a pore at the
bottom of the sample. From the initial configuration, the gas
pressure is allowed to increase. It can invade the pores either
by overcoming the capillary entry pressure, or by moving the
grains. Pores that have been invaded by gas are denoted with a
blue circle. The maroon lines indicate compressive forces
between grains. This network of compressive forces changes
drastically with the evolution of the fracture. The green lines
indicate tension between grains, caused by capillary forces
that hold the grains together. The network of tension forces
also changes with time, as the gas invades into the sediment.
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