Hi All
I used to think that if gas fields had not leaked their natural gas then
they should not leak CO2 but I can now see that this argument would be
changed by fracking.
However if the pressure is high enough the density of CO2 is higher than
that of sea water. If you fill a deep sea depression with it and then
cover the CO2 puddle with a material which prevents or greatly slows
diffusion of CO2 to the sea water then most of it should stay put. The
cover could be a layer of liquid with a density intermediate between the
CO2 and sea water and very low miscibility with both. This would allow
it to self repair. We could also stab pipes through it to add more CO2
of to release some in order to offset Lowell Wood's overdue ice age. We
need to look for deep depressions close to where CO2 is being produce or
could be concentrated.
I did suggest this in a previous contribution to the blog quite a while
ago but I think that it sank without trace. This is what we want for
the CO2.
Stephen
Emeritus Professor of Engineering Design
Institute for Energy Systems
School of Engineering
Mayfield Road
University of Edinburgh EH9 3JL
Scotland
Tel +44 131 650 5704
Mobile 07795 203 195
www.see.ed.ac.uk/~shs
On 01/06/2011 21:35, Gregory Benford wrote:
Michael raises the crucial issue: /*Should the oil and gas industry be
relied upon at the geological time scale needed for massive CO2
sequestration?
*/There are measurements Sherry Rowland told me about ~5 years ago,
made by his group at UCI, of the methane content of air across Texas &
Oklahoma. /He found no difference in methane levels in cities vs oil
fields and farms. /
He inferred that many oil wells, including spot drillings that yielded
no oil, but penetrated fairly deeply, were leaking methane into the
air. No one has contradicted this.
That made me forget CCS in such domes. Thus I went back to working on
CROPS, where we know it takes ~1000 years to return to the atmosphere.
Gregory Benford
On Wed, Jun 1, 2011 at 1:25 PM, Michael Hayes <[email protected]
<mailto:[email protected]>> wrote:
Hi Folks,
After reading Greg's post, I have spent some time looking into the
methane release being caused by "Fracking". Here is a link to
a resent film on the subject.
http://www.youtube.com/watch?v=dZe1AeH0Qz8 If you are interested
in the methane issue in general, I encourage you to take the time
to view this film. I do realize that any "media" based documentary
is subject to dispute and debate. However, I bring this to the
group for 2 reasons.
1) These are the same oil fields that are being proposed for
massive CO2 geological storage. Fracking is rapidly taking that
option off the table. I have never believed oil field CO2
sequestration was practical. However, this type of information
should raise profound questions about the entire concept
of geological CO2 sequestration.
2) The methane release (GHG effect) from such wide spread use of
this drilling method can equal all other anthropogenic GHG sources
at the regional level.
Fracking is a methane wild card which can not be ignored. And, oil
field CO2 sequestration is in direct opposition to the current oil
and gas industry activities. I believe the question of; /*Should
the oil and gas industry be relied upon at the geological time
scale needed for massive CO2 sequestration?*/, should be asked.
The issue of fracking related pollution is important and should
not be ignored. However, the issue of paying this industry to
provided centuries of massive CO2 sequestration should be viewed
with skeptical eyes usually reserved for used car salesmen. I
do apologize to all used car salesmen for the comparison.
Thanks for your patience.
Michael
--
You received this message because you are subscribed to the Google
Groups "geoengineering" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/geoengineering/-/NGdwcTZVTVBhVkFK.
To post to this group, send email to
[email protected]
<mailto:[email protected]>.
To unsubscribe from this group, send email to
[email protected]
<mailto:geoengineering%[email protected]>.
For more options, visit this group at
http://groups.google.com/group/geoengineering?hl=en.
--
You received this message because you are subscribed to the Google
Groups "geoengineering" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/geoengineering?hl=en.
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
--
You received this message because you are subscribed to the Google Groups
"geoengineering" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/geoengineering?hl=en.
