ERS120H5 Lecture 12: LEC12
Document Summary
Once formed, oil and gas move through porous rock and are trapped in reservoirs. Slow burial and conversion of organic matter into oil and natural gas. Higher percentage of open pore space = high porosity. Lower percentage of open pore space = low porosity. Original mud with organic material becomes oil shale. High permeability (like sandstone) that can hold oil and gas. Rock of the right shape with low permeability (like shale) that traps oil and gas. Thick petroleum mixed with sand and clay. 2 tons of tar sands = 1 barrel crude oil. 6:1 ratio of energy used to energy produced. Oil or gas that remains in the source rock. Oil shale - very black, smells like petroleum, flammable. Dramatically increases permeability which causes the fluids to come out. Proportion of carbon increases in the residue. Layers of organic material are compressed and heated by burial. Heat and pressure change peat to different coal grades.
