geologic sequestration

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Geologic Sequestration. Geologic sequestration is the process by which CO2 is captured and stored by geologic formations. Geological Carbon Sequestration Options. Figure from IPCC. Carbon Capture and Storage. http://www.climatechange.utah.gov/imagessimplifiedCCGSProcess_small.jpg. - PowerPoint PPT Presentation

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Geologic Sequestration

Geologic SequestrationGeologic sequestration is the process by which CO2 is captured and stored by geologic formations.

Geological Carbon Sequestration OptionsFigure from IPCCCarbon Capture and Storage

http://www.climatechange.utah.gov/imagessimplifiedCCGSProcess_small.jpgStorage CapacityOil and gas fields = 675 -900 GtCO2Unminable coal seams = 3 200 GtCO2Deep saline formations 1000 104 GtCO2Basalt and shales = ?Source: IPCC Special Report on Carbon dioxide Capture and StorageCarbon CaptureWill work on large point source CO2 sources. This means it will not work on cars, trucks etc.Will work by various techniques. Currently expensive!

Four Corners Power plant (epa.gov)CO2 TransportPipelines These will have to connect the sources with the sequestration sitesMany of these exist already in oilfields

http://www.nicholas.duke.edu/thegreengrok/graphics/CO2piplines-ushttp://www.isgs.illinois.edu/maps-data-pub/publications/geobits/graphics/fold-rocks.gif

7Reservoir qualityPorosityPermeability

Photomicrographs by Peter Mozley

8

Photo by Greg Smith9Braided River depositsCaprock (Seal) IntegrityMust have very low permeabilityUnderstanding fractures is critical

Photo by Peter MozleyNavajo (reservoir)Carmel (seal)I-70 Road cut, San Rafael Swell10Challenges to Large-Scale SequestrationTechnologicalCost of carbon captureLegalLiability, regulations, pore space ownershipSocietalCCS will add to cost of energyBenefits of CCS are long term and hard to directly seeDiscuss each in turn, particularly possible risks associated with subsurface storage. Ask students which they think is the greatest barrier.11

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