by David McClellan -
Sep 3rd, 2008
Vast deposits of oil shale in the American west are being eyed for development to reduce reliance on foreign sources of oil and bring down the price of fuel. A recent report Dr. Adam Brandt at the University of California Berkeley, as reported by greencarcongress, tallies the environmental cost.
Here's the bottom line: oil shale releases 21% to 47% more greenhouse gases (GHG) than conventional oil production, consumes scarce water resources and threatens grounwater flow and quality.
The analysis assumes the oil is extracted from shale using the in-situ conversion process (ICP) developed by Royal Dutch Shell. The process works by literally heating the Earth to depths of 1000 feet for two or more years with massive electric heaters inserted into the ground. The extraction process is so energy intensive that it produces only 1.2 to 1.6 times more energy than it consumes, so it might be thought of as energy conversion as much as it is energy production.
Despite these questionable trade-offs and environmental risks, Dick Kempthorne, Secretary of the Interior Department, recently announced proposed regulations for developing shale in three western states and has given oil companies six leases for demonstration projects.
The US has bountiful supplies of oil shale, 60% to 70% of the world's deposits. It's estimated that our shale holds three times as much oil as all of Saudi Arabia and for that reason has long been considered a potentially enormous oil supply waiting for the right time, the right technology and the right price. A recent Rand study says extraction isn't profitable unless oil is selling for $70 to $95 per barrel although Shell has said it could be competitive at $30/bbl. With oil around $120/bbl now, it should be economically competitive and with Americans very unhappy about the price of gasoline, expect increasing political pressure to tap the shale reserves. The current battle over offshore drilling is a precursor of a much bigger fight.
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