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SJF 04-2003
Carbon Sequestration
Geoscience Controls on Macroengineering Problems
Julio FriedmannUniv. Maryland
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AcknowledgementsDag Nummedal, Donna Anderson, Peigui Yin, Mike Batzle
Inst. For Energy Research, Univ. WyomingRM-CUSP (Rocky Mts. Regional Partnership)
Vicki Stamp, Michael MillikenRocky Mt. Oil-field Testing Center
Gerry Stokes, Jim Dooley, Jae Edmonds, Steve FetterJoint Global Change Research Inst, Univ. Maryland, Battelle-Pacific NW National Labs
Robin Newmark, James JohnsonLawrence Livermore National Labs
Other industrial contributors
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Massive Energy DemandTremendous growth in demand
By 2050, another 300 exojoules neededSignificant growth in developing countries (India, China)
We will rely heavily on fossil fuels for our energy needsWe will rely heavily on fossil fuels for our energy needs18
50
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NuclearHydro GasOil (feedstock)OilCoalWood
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Mill
ions
of T
ons
of O
il Eq
uiva
lentLimits to technologies that can
bridge demandMany off-the table technologies
(fusion, tidal, space-based solar)Many promising technologies require
deployment timeMany promising technologies require
development timeEnergy research funding down for 30
years
Stokes et al., 2002
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Unconventional Liquids and Gases
40,000 PgC
Atmosphere 750 PgC
Coal
5,000 to 8,000 PgC
Oil 130 PgC
Gas 120 PgC
Vegetation 610 PgC
Fossil Fuel Concerns
CARBON DIOXIDE AND GHG EMISSIONS ARE MAJOR CHALLENGE
On a grand scale, SOx, NOx, ozone, and metals are negligible concerns (rapid progress, low cost, straightforward regulatory framework)
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CO2 Concentration in Ice Core Samples andProjections for Next 100 Years
150
200
250
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350
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450
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Years Before Present
Vostok RecordIPCC IS92a ScenarioLaw Dome RecordMauna Loa Record
Current(2001)
Projected(2100)
0100,000200,000300,000400,000
Current (2001) CO
2C
once
ntra
tion
(ppm
v)
Vostok RecordLaw Dome RecordMauna Loa RecordIPCC IS92a Scenario
Projected (2100)
CO2 Concentration for last 400,000 yrs
www.clivar.org
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Separation of natural and non-naturalMost of the Observed Warming of the Last 50 Years is Attributable
to Human Activities
www.clivar.org
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Projected Temperatures for the 21st Century Are Significantly Higher Than at Any Time During the Last 1000 Years
These projected changes are larger than in 1995 due lower projected emissions of sulfur
www.clivar.org
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Carbon Sequestration Basics: Kaya Equation
Despite significant gains in efficiency, current emissions increase in (mostly increased energy consumption)
Economically and politically painful to reduce energy consumption
CARBON SEQUESTRATION WILL HAVE TO BE DEPLOYED VERY RAPIDLY AT AN ENORMOUS SCALE FOR SAFE GHG STABILIZATION IN THE ATMOSPHERE
CO2 Emissions = Population x (GDP/capita)x (Energy/GDP) x (CO2/Energy)
- (Removal from the Atmosphere)
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India and China
Growth of developing nation energy, esp. China and India, will be coal-based, requiring CO2 storage options
Almost 40%of world populationLarge coal resources, consumptionFew oil/gas resourcesLimited waterGrowth of auto industry
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Carbon Sequestration: General Modes
Ocean Sequestration – risky, uncertain, and priceyDirect, deep-ocean injection -- high Ph, monitoring, NIMBYBiogeoengineering -- very risky, uncertain efficiency
Geological Sequestration – point-source limited (pricey)Saline Reservoirs -- infrastructure costsOld Oil/Gas fields -- containment risksCoal Beds -- infrastructure costs, tough to monitor
Soil/Plant Sequestration – low-volume and problematicNo-till farming – low volume, low retention, tradingAdding biomass – monitoring, short time frame, small volume
Chemical Sequestration -- pricey and diceyCreating terrestrial solids – expensive, energy intensiveCreating hydrates – very risky, probably v. costlyBasalt injection – untested technology, slow reaction ratesAdvanced concepts – unproven or developing technology
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Carbon Sequestration: General Modes
Ocean & Geological modes have the highest storage capacity, which would cover from 50 to >250 years of current emission volumes. They also have long term sequestration potential
DOE, Carbon Sequestration Roadmap
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Geological Sequestration in the US
DOE Vision & Goal:1 Gt storage by 2025, 4 Gt by 2050
• Near sources (power plants, refineries, coal fields) • Near other infrastructure (pipelines)• Need sufficient storage capacity locally• Must be verifiable (populated areas problematic)
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CO2 Streams for Geological StorageHigh purity stream (> 90% CO2) critical
Currently, mostly natural sources
Refineries, IGCC’s and gas processing facilities are cheapest; capture devices on traditional plants possible.
Courtesy of R. Bajura, NETL
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1975 1985 1995 2005Year
PlannedReal
Cumulative Worldwide Gasification Capacity
Sleipner capture device
0 20 60 80 10040Throughput (MMscf/d)
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CO
2co
st(1
986$
/Msc
f, re
cov.
& c
omp.
) refinery
cementplant
power plant (gas)power plant (gas)
power plant (coal)
ammonia plant (ethanol)
Ananda, 1983
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CO2 Burial: Saline Reservoirs
S. Texas:• DOE/U. Texas• Frio Trend• closure dependent; already mapped• Small (2000 tons)
Different test sequestration projects 2002-2004Mountaineer Project
• AEP/Battelle• Mt Simon Fm.• NOT closure dependent --dynamic sequestration
US saline reservoirs have a potential of up to 130 G tonnes sequestration
DOE, 1999
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Sleipner Vest: Utsira Formation
Miocene Aquifer: DW fan complex
30-40% porosity, 200 m thick
high permeabilitybetween 15-36 oC – w/i
critical range
Geol. Survey of Denmark & Greenland
http://www.statoil.com
Economic driver: Norwegian carbon tax on industry ($50/ton C)Cost of storage: $15/ton C
FIRST major attempt an large volume CO2sequestration, offshore Norway. Active since 1996. Monoethanolamine (MEA) capture
Target: 1 MM ton C/yr.So far, 6 MM tons
Operator: StatoilPartners: Norsk-Hydro,
Petoro, Shell-Esso, Total-Elf-Fina
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4D seismic monitoring and visualization
Seismic Survey of Utsira Fm.
Courtesy of Statoil and IEA
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CO2 Burial: Coal ReservoirsMany current coal-bed methane CO2 injection projects
Large, active project in N. New Mexico, injecting both CO2 & N2 for ECBM recovery
DOE, 1999
Courtesy Adv. Resources International
The estimated US sequestration potential is 10 G tonnes, but is probably higher
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CO2 Burial: Coal-bed adsorption capacityCO2 adsorbs directly onto the micropore surface of coal cleats. In the process, it displaces CH4.
• Commonly, 2 CO2 captured for every CH4 molecule. • This may vary with coal rank.• Worst ECBM coals may make best sequestration coals
Data from H. Gluskoter & R. Burruss, USGS, Reston
12
4
16
8
0
Anth Bitum Sub-bit Lign
Uncertainties include effects of coal mineralogy, brine chemistry, other issues
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Oil Shales (High TOC mudstones)
Low-moderate grade organic-rich mudstones have some petrologic similarities to coal as regards their gas adsorption. This means that they are a viable CO2 storage targets
Almost nothing is known about these rocks as potential reservoirs.
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Plateau BasaltsThese flows involved 40,000 cubic miles of mafic rock. This may react with with carbon-rich fluids to form iron and magnesium carbonates.
The permeability is fracture controlled. The slow reaction rates and uncertain hydrology make these targets problematic.
Pacific Northwest Labs is preparing a test site for potential carbon storage.
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CO2 Capture: Enhanced Oil Recovery (EOR)At right temperature and pressure, CO2 will dissolve in oil through multiple-contact miscibility. This decreases in-situ viscosity and increases oil volume. improving recovery of oil in place.
http://www.ieagreen.org.uk/
Although some CO2 is co-produced, most remains dissolved in subsurface oil, where it is effectively sequestered.
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CO2 Injection Schemes for EORThere are multiple approaches which are optimized as a function of AGI gravity, water saturation, wettability, permeability, and CO2 slug size
WeyburnWeyburn CO2 CO2 RecompressorRecompressor( under construction)( under construction)
http://www.ieagreen.org.uk/weyburn6.htm
Startflood
Stopflood
Stopchase
Startchase
CO2 H2O Natural Gas
Continuous
Contin./H2O
WAG/H2O
TWAG/H2O
WAG/Gas
Jarrell et al., 2002
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EOR Project: Weyburn FieldEnCana EOR project, Saskatchewan
Takes ~5000 tonnes/day CO2 from a coal gasification plant in North Dakota (330 km pipeline) to recover 130-160 MM bbl incremental oil
Carbonate reservoir at 1400 m• Injection has resulted in local dissolution; enhanced porosity• Unexpected fracture trends
Discovered in 1954, 50 000 acres Initial OIP 1.3 billion barrels w/ 23-34o API gravity. Primary production + waterflood = ~34% of the STOOIP With enhanced recovery, almost 50% of the oil. Will extend field life 25 years in a 40 year projectThe first CO2 injected in the 2000.
http://www.ieagreen.org.uk/weyburn4.htm
At project end, ~19 million
tonnes CO2sequestered
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Large Scale Studies
Learnings from Weyburnand Sleipner
Learnings from petroleum industry (5 year rule of thumb)
Due to the scale of the problem, large-scale results are critical to large-scale sequestration efforts
Remember that world-wide, ~2000 MM tons/yr needed for stabilization
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arbo
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(GtC
/y)
WRE450WRE550
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Foss
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A1BA1TA1F1A2B1B2
Courtesy of S. Fetter, UMD and JGCRI
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Rocky Mountains as a logical testHigh Density of potential reservoirs
• Unmineable coal seams• Old oil fields (e.g. Rangely)• Large capacity gas fields near blowdown• Saline aquifers (dynamic&static)• Oil shales
CO2 and industry infrastructure• Wyoming: 89 MM tons/yr• Long-lived hydrocarbon industry• Enormous public/private data base for science/engineering• Carbon advisory boards
Low population density Low risk of serious environmental/seismic hazards
Current WY-CO-UT CO2 Pipelines with 10, 25 & 50 km radii
D. Anderson, Col. School of Mines and CUSP
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CARBON UTILIZATION & STORAGE PARTNERSHIP (RM-CUSP)
Major Multi-sectoral EffortSeven UniversitiesFour petroleum companiesTwo coal companiesFive power companiesThree national labs/facilitiesSix NGO’s/Environmental groupsMultiple state govt. agencies
Multidisciplinary teamGeologists, geochemists, geophysicistsBiologists, geographers, ecologistsEconomists, policy experts, politiciansEducators, museum communityPetroleum, mechanical, & chemical engineers
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Zero Emissions Plants: Siting & Construction
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Caldeira et al., 2003
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Within a 2ºC warming scenario, we must build a 900 ± 500 MW zero-emissions plant somewhere in the world each day for 50 years.
Stabilization of atmospheric concentration of GHG/CO2 requires extremely steep reduction of emissions and rapid deployment of zero-emissions power plants.
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Feedstocks:Coalbiomasssolid wasteorimulsion
Gasified, Combined Cycle Plants (IGCC)
Reduction in cost and efficiency improvements are needed to deploy these plants more broadly (high cap. ex.)
High efficiency (50%), high wattage (>500 MW) plants
• Mix feedstock with steam (syngas)• Strip sulfur, metals as slag• No ash/fly ashCombustion by-products: • Hydrogen (feedstock for fuel cells)• Pure CO2 stream
www.ieagreen.cc.uk
British Coal gasifier: burns sewage sludgeGasification
Process
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FutureGen (Zero Emissions Plant)
Successful plant siting requires proper characterization of injection targets in terms of capacity (~50 years) and rate
“Today I am pleased to announce… a $1 billion, 10 year demonstration project to create the world’s first coal-based, zero-emissions electricity and hydrogen power plant” -- G.W. Bush
Carbon Capture:• Initial goal: 90% capture• Ultimate goal: 100% capture Economics: • <10% increase in cost of electricity• H2 production at $4/million Btus• S and N2 used for fertilizersPower Generation: • ~275 MW (small prototype)• 50-60% efficiency
DOE Fossil Energy
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Orimulsion Gasified Fuels
Orimulsion has various issues about how to maintain fluid transport w/o deposition in pipelines or tankers, as well as how to best atomize for combustion
Orimulsion is a bitumen (70%) emulsified with water (30%), with some stabilizing additives. It is a fuel well suited for gasified combustion, and is the product of heavy-oil (tar sand) production
Very large reserves:• Orinoco: 1.2 trillion STOOIP• Canada: 1.4 trillion STOOIP Energy content • Coal – 6700 Kcal/kg• Fuel oil – 10600 Kcal/kg• Orimulsion – 7200 Kcal/kg
www.orimulsion.com
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Critical EOR Research TargetsSandstone Reservoirs (EOR and Saline aquifers)
Reservoir architecture and heterogeneityMultiphase fluid flow in porous mediaBrine/rock/CO2 chemical interactions
Carbonate reservoirs (EOR and Saline aquifers)CO2 dissolution: poro-perm enhancement, seal leakageFracture characteristicsBrine/rock/CO2 chemical interactions
EOR specific researchDissolution kinetics/miscibility in sequestrationProduction response given initial API gravity, viscosity
Coal/ECBM/Oil Shale ReservoirsEffects of coal/shale petrologyFractures density, permeability, and distributionFar-field aquifer affectsGas mixture adsorption
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CAPTURE DEVICES!
Significant reductions of cost or even comparative cost will enable rapid deployment of carbon storage schema
The cost of capture is the single largest impediment to implementation of carbon sequestration at a grand scale
Carbon/Hydrogen Capture:• Amine (MEA) scrubbing• Ceramic membranes• Oxygenated combustion
DOE Fossil Energy
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Cap Rock IntegrityA major concern in sequestration is preventing leakage and “blowout”. These issues rely on the integrity of the seal or cap rock.
New models suggest that certain minerals (Magnesite, Dawsonite) may precipitate at the top of the CO2 reservoir, increasing the thickness and decreasing the permeability of the cap rock.
Johnson et al., 2001
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Capillary Entry PressureSeals integrity is commonly estimated by capillary entry pressure tests. Air, gas, or mercury is injected into rock, and pressure difference across rock sample is measured.
When pressure is high enough to overcome capillary forces or to induce fracturing, fast paths are established and leakage occurs.
This is a concern where overpressurizing reservoirs via CO2 injection, but most natural seals are sufficient
Harrington & Horseman., 1999
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Effective Monitoring and Verification
3D and 4D seismic
Electrical Resistance Tomography (ERT)
Spiking of injection stream
Soil Surveys
Subsurface and near field water sampling
Courtesy Robin Newmark, LLNLhttp://geosciences.llnl.gov/esd/ert/
Necessary for both public safety and proper crediting
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Advanced Storage Concepts
• Genetic engineering of carbonate-forming minerals
• Distributed capture devices (e.g. venetian blind technology)
• Pulverized serpentine wind tunnels
The goal of many of these approaches is solid-state deposition of carbon as new minerals
In general, these approaches rely on untested technology with large costs or uncertainties.
Critical component of a research portfolio
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Geological-Biological Interactions
Microbially mediated carbonate precipitation
Methanogenic/chemotrophicbacteria in coal seams and oil shales
Adequate accounting of key subsurface actors
Everybody’s favorite next-generation science: many short- and long-term projects and studies aimed at subsurface sequestration
Atomic force micrograph of Shewanella bacteria (yellow) on the hematite surface (blue) immersed in anaerobic solution.
Courtesy of S. Lower, UMD
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Conclusions
Fossil fuels will be a primary component of future energy supply, driving carbon capture & storage
MUCH geology, geochemistry, and geophysics is needed to meet the rapidly evolving needs
LARGE SCALE tests are crucial to understand true feasibility and create appropriate policy/economic structures
The agenda is broad and the needs immense, but together we are equal to these challenges.
Kofi AnnanScience, March 2003