vGas
Hydrates form at low temperatures and high pressures. (USGS)
vThey
form as the cement in pore spaces and in layers and nodules of pure
hydrate. They also have the
capacity to fill sediment pore space and reduce permeability, which acts
as a seal for gas traps. (USGS)
vIn
permafrost areas, methane hydrates form when heat from the Earth’s
core cooks buried organic matter, releasing methane. The gas percolates
up through the sediments until it reaches a zone where the combination
of pressure and temperatures favor the formation of hydrates. (Goho)
vThose
found in marine sediments are formed when bacteria generate methane
from breaking down organic matter in low oxygen environments.
(Goho & O’Driscoll) These bacteria are usually found at pressures
greater than 1000 atmospheres and depths between 300-400 meters and 2500
meters. (Industry & O’Driscoll)
