Tuesday, June 23, 2009 9:55 PM CDT
COLUMN: Applying existing technologies to store CO2
By DIANA YATES, University of Illinois News Bureau, Life Sciences Editor
What is the process by which carbon dioxide is sequestered underground?
There are actually three forms of geologic sequestration being studied by the Illinois State Geological Survey: 1) enhanced oil recovery, where carbon dioxide (CO2) is injected into depleted oil fields to aid in the recovery of oil left in place; 2) coal bed methane recovery, where CO2 is injected into coal seams to displace methane, which can be recovered and used; and 3) storage in deep saline formations, where the CO2 is injected into deep porous rocks. The CO2 is then trapped in pore spaces and kept in place by relatively impermeable rocks directly above. In Illinois, as well as nationally, deep saline reservoirs have the greatest storage potential.
How is a suitable site for carbon sequestration found?
Really, there are two criteria: suitable geology, and knowing you have suitable geology. In Illinois, we have suitable geology, and thanks to the work of the Illinois State Geological Survey, we know it.
The Illinois Basin, a geologic structure that underlies Illinois, southwestern Indiana, and western Kentucky, is well-suited to permanently sequester large quantities of CO2 in deep saline formations. The Mount Simon Sandstone, the target sequestration formation, is a thick layer of porous sandstone underlying much of the state. The Mount Simon is between 4,500 and 6,500 feet beneath the surface and ranges from 1,000 to 1,700 feet thick. The Eau Claire Shale is a 300- to 500-foot-thick, relatively impermeable shale that is directly above the Mount Simon and acts as a seal or caprock.
How much CO2 will be injected into the ground each year?
At the Illinois Basin–Decatur Project, funded by the U.S. Department of Energy, the ISGS is partnering with Schlumberger Carbon Services and the Archer Daniels Midland Company to sequester 1 million metric tons of CO2 over a three-year period at ADM’s ethanol production facility in Decatur. When it is operational, FutureGen could sequester up to 1 million tons per year.
Has this technology been proven to work on such a large scale?
The Sleipner project in the North Sea of Norway has been injecting 1 million tons of CO2 per year since 1995. Additional large-scale projects are either under way or planned throughout the U.S. and around the world. Both FutureGen and the Illinois Basin–Decatur Project will demonstrate sequestration at a large-scale. What we learn from these projects will be used to inform larger commercial projects as they come on line.
Can injecting liquid carbon dioxide into the ground cause earthquakes?
Earthquakes occur when pressure is released along two rock faces. The injection of CO2 is highly unlikely to cause an earthquake, unless it were to be directly injected along a fault plane. Geophysical surveys are run before injection starts to detect and avoid such faults.
Could liquid carbon dioxide migrate, escape from the ground or get into aquifers?
The Illinois Environmental Protection Agency requires that underground sources of drinking water be protected. All sequestration projects are subject to regulation under the Safe Drinking Water Act. The Mount Simon formation is more than a mile below groundwater used as a drinking source. Three major seals, or impermeable rock units, occur between the Mount Simon Sandstone and the surface throughout the Illinois Basin. These seals act as multiple barriers for the movement of CO2 once sequestered.
Do you have confidence that this technology will work?
Geologic sequestration utilizes experience from several existing industries including oil and gas production, natural gas storage, and enhanced oil recovery.
For example, natural gas has been stored underground at more than 30 locations across Illinois without leakage since the 1960s. We are applying these technologies to a new purpose: storing carbon dioxide. Every effort is being made to ensure that sequestration is safe and effective, and the work we are doing now will help us answer this question.
Dr. William W. Shilts, a graduate of DePauw, Miami of Ohio, and Syracuse universities, was named executive director of the Institute of Natural Resource Sustainability on July 1, 2008. The institute, which comprises the Illinois State Geological Survey, Illinois Natural History Survey, Illinois State Water Survey, and the Illinois Sustainable Technology Center, has wide-ranging research and service programs in ground- and surface-water resources, climate, energy and mineral resources, ecosystems, invasive species, three-dimensional geologic mapping, and environmental geology. The INRS provides objective scientific information to state and federal agencies, units of local government, industry, and the public. Dr. Shilts is also adjunct professor with the University of Illinois, the University of Quebec and Illinois State University.
Add your comments
Not already registered? Then click Here.
Comment policy:
JG-TC.com encourages readers to engage in civil conversation with their neighbors. Comments that are submitted are not posted to the site immediately. They go into a queue to be moderated and may take several hours to be reviewed. Comments posted on Saturday may not be reviewed until Sunday afternoon.
In order to keep the page a set width, long lines (mostly long links) will be chopped. Try putting spaces in your links or consider using tinyurl.com to make a smaller link that you can include.
We will never edit or alter your comments, but we do reserve the right to remove comments that violate our code of conduct.
No comment may contain:
* Potentially libelous statements; such as accusing somebody of a crime, defamation of character, or statements that can harm somebody's reputation.
* Obscene, explicit, or racist language.
* Personal attacks, insults, threats, harassment or inciting violence.
* Commercial product promotions.
If you have any questions, please contact our moderator.
|
|
|
|
|
fisherman52 wrote on Jun 24, 2009 2:49 AM:
God developed and implemented the Carbon Capture And Sequestration system on Earth!
He captured the carbon dioxide, the mercury, the arsenic, the lead and many of the other hazardous chemicals and bound them up in a matrix that we call coal! He bound up this matrix in such a way so that the materials he put into it would stay sequestered forever! He took that matrix and buried most of it, so it would be well below the life zone of Earth. Locked away forever.
He knew the planet would produce more carbon dioxide than the plants could ever recycle. He knew the mercury would contribute to autism in his children. He knew that arsenic caused death and that lead would cause nerve damage and learning disabilities. He knew if he buried it, it would make it more difficult for us to use it to screw up his creation!
And here we are today, digging up what he has covered up, releasing the poisons he so lovingly protected us from, releasing them into death and destruction in his world! Releasing them into the life zones of his creation!
God invented the sequestration concept, why do we have to keep digging up his work and bringing the pollution back into our lives!
I wonder why the trains that haul the wonderful fuel Clean Coal Advertising coal from the mines to the generator plants don't burn cheap Clean Coal Advertising coal instead of Refined Diesel Oil? They must be willing to spend the extra money for some reason! It couldn't be that the Federal Government quit believing the Clean Coal Advertising scam a long time ago could it? "