Friday, May 22, 2009

Vulnerability of Drinking Water and Geosequestration (CO2 Sequestration)

Carbon Capture and Sequestration is also known as CO2 sequestration and Geosequestration... in this information supplied by the US EPA, they refer to it as "GS".

All this information came from the U S EPA
Vulnerability Evaluation Framework for Geologic Sequestration of Carbon Dioxide
July 10, 2008 -

Click on the above title to be taken to the complete publication.....lots to read there as you form your own opinion regarding CO2 sequestration... would you want it in YOUR COMMUNITY?

Neither do I - NIMBY - OR YOURS!

"5.2.3 Pressure-Induced Physical Effects
Injecting CO₂ into geologic formations will in most cases cause subsurface changes in pressure. As
discussed above, induced fracturing and fault reactivation can occur if injection pressure exceeds fracture pressures, which may in turn result in the opening of fl uid migration pathways. If pressures are great enough, they could in extreme cases cause earthquakes (Healey et al., 1968).

There may be greater uncertainty about evaluating pressure effects in GS systems when examining the potential for pressure-induced regional scale impacts that do not involve fracturing or faulting.

As discussed in Chapter 4, pressure changes in the injection zone could cause regional impacts on overlying aquifer systems, including changes in groundwater fl ow directions and water table levels. These may result in alterations in the distribution and fl uxes of groundwater. This could in turn have other impacts, for example, changing the quantity of groundwater that is available for municipal drinking water supplies. There also could be pressure-induced migration of brines and other fluids through the pore structure of overlying formations into groundwater receptors, which may impact water quality. Furthermore, pressure-induced fluid displacement could result in the release of brine at locations where injection zone formations outcrop at the land surface. Regional pressure effects have been the focus of relatively few studies, and uncertainties and vulnerabilities associated with this subject should be addressed through additional research."