geological sequestration of co2 in saline aquifers- an...
TRANSCRIPT
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Geological Sequestration of CO2
in Saline Aquifers- An Indian Perspective
By A. K. Bhandari, ([email protected])
17th January, 2013, New Delhi ACBCCS- 2013
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Contents
• Introduction and Options for storing CO2
• Why Saline Aquifers?
• Mechanism of Carbon Dioxide Trapping
• Risk for Storage in Saline Aquifers
• Screening Criteria
• Ongoing Projects
• Distribution of Saline Aquifers(World Scenario and Indian Scenario)
• Storage Potential
• Conclusions
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Since fossil fuels particularly coal would inevitablybe the mainstay for energy generation in India,carbon dioxide emissions are likely to increaseexponentially. To contain and ultimately reducethe carbon dioxide emissions there are threetechnology driven options.
• Energy conservation and efficiency
• Substitute lower carbon or carbon free energysources (renewable, nuclear, hydropower and lowcarbon fuels)
• Capture, reuse and geological storage of carbon
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Figure 1: Options for storing CO2 in deep underground geological formations
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Why Saline Aquifers?
• The estimated storage capacity of the salineformations is large enough to make them viablefor any long term solution.
• Saline formations underlie many parts of theworld and in the proximity of the stationarypolluting sources thereby reducing the cost ofinfrastructure.
• It can help in achieving near zero emissions forthe existing power plants and industrial units.
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• The fact that carbon dioxide has been naturallystored for geological time scales enhances thecreditability of the storage options.
• Huge thickness of impervious (clay/ sandstone)cap rock ensures that residence times are longand accounting for volume sequestered is straightforward.
• Scenarios for negative impacts and unintendeddamages are limited.
• Usually due to their high saline proportions anddepth, they cannot be technically andeconomically exploited for surface uses.
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Table 1: Storage capacity for geological storage options.
Geological Storage
Option
Global Capacity
Reservoir type
Lower estimate of
storage capacity
(Gt CO2)
Upper estimate of
storage capacity
(Gt CO2)
Depleted oil and
gas fields
675 900
Unminable coal
seams
3-15 200
Deep saline
reservoirs
1000 Uncertain, but
possibly 104
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Figure 2: Conceptual diagram of storage in confined and unconfined aquifers
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Specific Risk for Storage in Saline Aquifers
• Reservoir Properties and Modeling
• Cap rock Integrity
• Aquifer Flow Modeling
• Solubility in groundwater
• Reaction with host rock
• Groundwater Pollution
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Screening Criteria for Storage in Saline Aquifers
In general storage sites should have;
(i) adequate capacity and injectivity;
(ii) a satisfactory sealing cap rock and confirmingunit
(iii) a stable geological environment and;
(iv) Realistic and quantitative information of thecharacteristics of the subsurface is needed toassess the feasibility of sites.
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• Assuming that basement rocks would not havesufficient injectivity, thickness of sedimentarycover provides initial index for prospectingsuitable formations. Younger sedimentarybasins are more suitable as high porositytends to be preserved at shallow depths. Inolder basins, porosity is lost due tocementation and compactness because ofdepth of burial.
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Table 2: Ongoing ProjectsProject Country Scale of
ProjectTotal storage Storage type Age of
formation Lithology
Sleipner Norway Commercial 20 Mt planned
SalineAquifer
Tertiary Sandstone
Minami-Nagoaka Japan Demo 10,000 t planned
SalineAquifer(Sth.NagoakaGas Field)
Pleistocene Sandstone
Frio USA Pilot 1600 t Salineformations
Tertiary Brinebearingsandstone-shale
Snohvit Norway DecidedCommercial
Salineformations
LowerJurassic
Sandstone
Gorgon Australia PlannedCommercial
Salineformations
Late Jurassic Massivesandstonewith shaleseal
Ketzin Germany Demo. 60kt Salineformations
Triassic Sandstone
Otway Australia Pilot 0.1 Mt Saline fmand depletedgas field
Cretaceous Sandstone
Teapot Dome USA ProposedDemo
10kt Saline fmand CO2-EOR
Permian Sandstone
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Distribution of sedimentary basins World Scenario
Figure 3: Distribution of sedimentary basins around the world (after Bradshaw and Dance, 2005; and USGS, 2001a)
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Indian Scenario
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Figure 5: Sedimentary basins map for oil and gas recovery in India . Source: DGH (2006)
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Figure 6: Distribution of Saline Aquifers
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Figure 8: Location map of the study area and regional geological setup
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Figure 9: Three Dimensional model of Chatta-Chattikara area showing disposition of different lithological layers.
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Conclusions
• Geological storage of Carbon dioxide forreducing its emissions for mitigation of globalwarming is a new research area.
• There are gaps in our knowledge as to theregional storage capacity and potential ofdifferent sedimentary basins and the deepsaline aquifers occurring within them.
• Extensive further research is needed bothregionally and globally to study their truepotential.
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• Despite the fact that there are some areaswhere additional work is clearly needed toimprove technologies and decreaseuncertainties, there appear to be noinsurmountable technical barriers forgeological storage of CO2 as an effectivemitigation option.
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THANK YOU