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Carbon dioxide capture for storage in deep geologic formations
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Carbon Dioxide Capture for Storage
in Deep Geologic Formations –
Results from the CO2
Capture Project
Capture and Separation of Carbon Dioxide
from Combustion Sources
Volume 1
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Carbon Dioxide Capture for Storage
in Deep Geologic Formations –
Results from the CO2
Capture Project
Capture and Separation of Carbon Dioxide
from Combustion Sources
Edited by
David C. Thomas
Senior Technical Advisor
Advanced Resources International, Inc.
4603 Clearwater Lane
Naperville, IL, USA
Volume 1
2005
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Preface
Gardiner Hill, BP, plc, Sunbury-on-Thames, UK
Chairman, CO2 Capture Project Executive Board
We are seeking solutions to one of the great international challenges – reducing carbon emissions and their impact
on climate change. Over the past decade, the prospect of climate change resulting from anthropogenic CO2 has
become a matter of deep and growing public concern. Many believe that the precautionary principle is the
appropriate response at this time and there is increasing consensus that the action to mitigate this human induced
climate change will require not just reducing anthropogenic CO2 emissions, but more importantly stabilizing the
overall concentration of CO2 in the earth’s atmosphere. There are many technology options that can help, but it
appears that almost all will add cost to the price we pay for energy.
Given the scale of the climate change challenge and the need to continue to provide affordable energy in many
different cultural, social and operational settings, a portfolio of approaches will be required. The best solution will
not be the same in each case. It seems that the full portfolio of energy technologies will be required. Yet, one option
that has broad potential application is the technology of CO2 capture and geological storage. Capture technology is
already in use, but only at small scale. While this technology is proven, it needs considerable development to
enable scale-up for industrial application and to reduce the cost of what is a very expensive technology today.
Geological storage, on the other hand, builds on the oil and gas industries’ considerable experience of injecting gas
for enhanced oil recovery (EOR), gas storage operations and reservoir management, which are all today
successfully managed at scale. Capturing and storing CO2 from the combustion of coal, oil and natural gas could
deliver material reductions in greenhouse gas emissions and provide a bridge to a lower carbon energy future.
That is why the participants of the CO2 Capture Project (CCP) decided to work together and collaborate with
governments, industry, academic institutions and environmental interest groups, to develop technologies that will
greatly reduce the cost of CO2 capture and to demonstrate that underground, geological storage is safe and secure.
The goal is to reduce the environmental impact of fossil fuel based energy production and use – over the same
period of time when global energy demand is forecast to continue to grow strongly – in the most cost effective
manner.
Three governments and eight companies have jointly funded, and actively participated in, the CCP. The best minds
and research laboratories have been brought together to identify and pursue the most promising of the CO2 capture
technologies that could be commercially ready in the 2012 time frame. A wide range of academic and commercial
institutions, all subject to open and comprehensive peer review, have provided breakthrough thinking, concepts
and technology. The views of external bodies, such as environmental groups have been incorporated. Through
international public–private collaboration, we believe the CO2 Capture Project has made a real difference by
stimulating rapid technology development and creating the new state of the art.
The CCP book contains technical papers and findings from all contractors involved in the first phase of the project.
This work is the combined effort of over 70 technology providers, 21 academic institutions, six NGOs and each of
the eight participating companies. In addition, the work benefited from the input and guidance from our four
participating government organisations. The book is compiled in two volumes: Volume 1 covers capture
technology development, our work in the area of capture and storage policy, the Technology Advisory Board
project review and the common economic model that was developed to enable us to compare performance on a
common basis and present the economic results. Volume 2 covers the geological storage program which we called
SMV – Storage, Monitoring and Verification. These two volumes should serve as a valuable reference document
v
for a wide spectrum of industry, academia and interested stakeholders on technology development for CO2 capture
and geological storage.
The CCP has achieved its Phase I goals for lower cost CO2 capture technology and furthered the safe, reliable
option of using geological storage. The results speak for themselves; delivering upwards of a 50% reduction in the
cost of CO2 capture in a 3 year time frame, is a considerable accomplishment. The results also offer promise that
further significant improvements are likely in the performance and costs of this technology. The geological storage
program has pioneered the risk-based approach for geological site selection, operation and abandonment. The
program has made a major contribution overall to the confidence of CO2 geological storage integrity and has
developed some exciting new monitoring tools. There is now a much deeper understanding of the important role
carbon capture and geological sequestration can play in a carbon-constrained future, particularly in a future that
involves stabilization of the concentrations of CO2 in the earth’s atmosphere.
The industrial participants in the CCP would like to thank all of the people who have worked with us over the past
4 years and who have supported the delivery of our encouraging results. The list is long and includes people from
academia, technology providers, the NGO community, industry and governments. The degree of cooperation, and
hard work by those involved has been gratifying and has helped enormously in finding our way through the many
challenges that lay in our path. The CCP project has succeeded because of extreme hard work from the whole
extended multi-disciplinary team.
I would like to especially acknowledge the US DOE’s National Energy Technology Laboratory, The European
Union’s DGTREN and DGRES programs, and the Norwegian Research Council’s Klimatek program, without
whose support the CO2 Capture Project would not have been possible. Finally, I would like to formally thank the
companies who were the project industrial participants – BP, ChevronTexaco, EnCana, ENI, Hydro, Shell, Statoil
and Suncor – for their proactive engagement and strong leadership of the program. All the participants were
engaged, active, and willing partners working towards the project goals.
The two volumes that you hold in your hand are the result of many thousand hours of effort. It is the Executive
Board’s hope that the technologies described here will form the basis of a vibrant and important industry for the
benefit of mankind.
vi
Acknowledgements
Helen Kerr, BP, p.l.c.
Program Manager, CO2 Capture Project
The CO2 Capture Project results reported here were delivered with the help of an exceptional technical team, who
all deserve a special mention, but in particular I would like to acknowledge with thanks the CCP technical team
leaders past and present: Henrik Andersen (Hydro), Mike Slater (BP), John Boden (BP), Odd Furuseth (Statoil),
Henriette Undrum (Statoil), Robert Moore (BP), Torgeir Melien (Hydro), Ivanno Miracca (Eni), Mario Molinari
(Eni), Craig Lewis (ChevronTexaco), Scott Imbus (ChevronTexaco), Arthur Lee (ChevronTexaco) and Iain
Wright (BP).
The contracting and procurement support staff who handled over 100 contracts were magnificent: Robert Sloat,
John Woods, John Hargrove, Sheetal Handa (BP) & Ole Morten Opheim (Statoil), Donna Douglas (Accenture,
BP), Svein Berg (Statoil) and Stuart Green (Atkins, Faithful & Gould).
The Technology Advisory Board provided timely sage advice and the benefits of their collective experience to help
the project succeed. Special thanks to Chairman Vello Kuuskraa (Advanced Resources International, ARI) for your
outstanding commitment and personal support.
The project could not have happened without the support from our partners in government who co-funded the
program. A special thanks to the project managers, Philip Goldberg and David Hyman (US DOE, NETL), Dennis
O’Brien and Vassilios Kougionas (EU DGTREN & EU DGRES) and Hans-Roar Sorheim (NRC Klimatek).
These volumes were edited by two exceptional people, David Thomas (ARI) and Sally Benson (Lawrence Berkeley
National Laboratory). Thank you for your hard work on behalf of the CCP.
vii
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CONTENTS
Preface v
Acknowledgements vii
VOLUME 1
Introduction 1
David C. Thomas and Helen R. Kerr
Chapter 1: Policies and Incentives Developments in CO2 Capture and Storage Technology:
A Focused Survey by the CO2 Capture Project 17
Arthur Lee, Dag Christensen, Frede Cappelen, Jan Hartog, Alison Thompson,
Geoffrey Johns, Bill Senior, Mark Akhurst
Chapter 2: Review and Evaluation of the CO2 Capture Project by the Technology Advisory Board 37
Vello Kuuskraa
Chapter 3: Economic and Cost Analysis for CO2 Capture Costs in the CO2 Capture Project Scenarios 47
Torgeir Melien
SECTION 1: POST COMBUSTION CO2 SEPARATION TECHNOLOGY
Chapter 4: Post-Combustion CO2 Separation Technology Summary 91
Dag Eimer
Chapter 5: CO2 Removal from Power Plant Flue Gas –Cost Efficient Design and Integration Study 99
Gerald N. Choi, Robert Chu, Bruce Degen, Harvey Wen, Peter L. Richen, Daniel Chinn
Chapter 6: Post-Combustion Separation and Capture Baseline Studies for the CCP Industrial Scenarios 117
Paul Hurst, Graeme Walker
Chapter 7: KPS Membrane Contactor Module Combined with Kansai/MHI Advanced Solvent,
KS-1 for CO2 Separation from Combustion Flue Gases 133
Marianne Søbye Grønvold, Olav Falk-Pedersen, Nobuo Imai, Kazuo Ishida
Chapter 8: Removal of CO2 from Low Pressure Flue Gas Streams using Carbon Fibre Composite
Molecular Sieves and Electric Swing Adsorption 157
Paul Hurst
Chapter 9: Self-Assembled Nanoporous Materials for CO2 Capture
Part 1: Theoretical Considerations 165
Ripudaman Malhotra, David L. Huestis, Marcy Berding, Srinivasan Krishanamurthy,
Abhoyjit Bhown
Part 2: Experimental Studies 177
Ripudaman Malhotra, Albert S. Hirschon, Anne Venturelli, Kenji Seki, Kent S. Knaebel,
Heungsoo Shin, Herb Reinhold
ix
Chapter 10: Creative Chemical Approaches for Carbon Dioxide Removal from Flue Gas 189
Dag Eimer, Merethe Sjøvoll, Nils Eldrup, Richard H. Heyn, Olav Juliussen,
Malcolm McLarney, Ole Swang
SECTION 2: PRE-COMBUSTION DE-CARBONIZATION TECHNOLOGY
Chapter 11: Pre-combustion Decarbonisation Technology Summary 203
Henrik Andersen
Chapter 12: Generation of Hydrogen Fuels for a Thermal Power Plant with Integrated CO2-Capture
Using a CaO–CaCO3 Cycle 213
Julien Meyer, Rolf Jarle Aaberg, Bjørg Andresen
Chapter 13: Development of the Sorption Enhanced Water Gas Shift Process 227
Rodney J. Allam, Robert Chiang, Jeffrey R. Hufton,
Peter Middleton, Edward L. Weist, Vince White
Chapter 14: Coke Gasification: Advanced Technology for Separation and Capture of CO2 from
Gasifier Process Producing Electrical Power, Steam, and Hydrogen 257
Martin Holysh
Chapter 15: Development of a Hydrogen Mixed Conducting Membrane Based CO2 Capture Process 273
Bent Vigeland, Knut Ingvar Aasen
Chapter 16: Hydrogen Transport Membrane Technology for Simultaneous Carbon Dioxide Capture
and Hydrogen Separation in a Membrane Shift Reactor 291
Michael V. Mundschau, Xiaobing Xie, Anthony F. Sammells
Chapter 17: Silica Membranes for Hydrogen Fuel Production by Membrane Water Gas Shift Reaction
and Development of a Mathematical Model for a Membrane Shift Reactor 307
Paul P.A.C. Pex, Yvonne C. van Delft
Chapter 18: Design, Scale Up and Cost Assessment of a Membrane Shift Reactor 321
Ted R. Ohrn, Richard P. Glasser, Keith G. Rackers
Chapter 19: GRACE: Development of Pd–Zeolite Composite Membranes for Hydrogen Production
by Membrane Reactor 341
M. Mene´ndez, M.P. Pina, M.A. Urbiztondo, L. Casado, M. Boutonnet, S. Rojas, S. Nassos
Chapter 20: GRACE: Development of Silica Membranes for Gas Separation at Higher Temperatures 365
Henk Kruidhof, Mieke W.J. Luiten, Nieck E. Benes, Henny J.M. Bouwmeester
Chapter 21: GRACE: Development of Supported Palladium Alloy Membranes 377
Hallgeir Klette, Henrik Raeder, Yngve Larring, Rune Bredesen
Chapter 22: GRACE: Experimental Evaluation of Hydrogen Production by Membrane Reaction 385
Giuseppe Barbieri, Paola Bernardo
Chapter 23: GRACE: Pre-combustion De-carbonisation Hydrogen Membrane Study 409
Peter Middleton, Paul Hurst, Graeme Walker
Chapter 24: An Evaluation of Conversion of Gas Turbines to Hydrogen Fuel 427
Gregory P. Wotzak, Norman Z. Shilling, Girard Simons, Kenneth A. Yackly
x
SECTION 3A: OXYFUEL COMBUSTION TECHNOLOGY
Chapter 25: Oxyfuel Combustion for CO2 Capture Technology Summary 441
Ivano Miracca, Knut Ingvar Aasen, Tom Brownscombe, Karl Gerdes, Mark Simmonds
Chapter 26: The Oxyfuel Baseline: Revamping Heaters and Boilers to Oxyfiring
by Cryogenic Air Separation and Flue Gas Recycle 451
Rodney Allam, Vince White, Neil Ivens, Mark Simmonds
Chapter 27: Zero Recycle Oxyfuel Boiler Plant With CO2 Capture 477
Mark Simmonds, Graeme Walker
Chapter 28: Zero or Low Recycle In-Duct Burner Oxyfuel Boiler Feasibility Study 489
Mark Simmonds, Graeme Walker
Chapter 29: A Comparison of the Efficiencies of the Oxy-fuel
Power Cycles Water-Cycle, Graz-Cycle and Matiant-Cycle 499
Olav Bolland, Hanne M. Kvamsdal, John C. Boden
Chapter 30: Revamping Heaters and Boilers to Oxyfiring—Producing Oxygen by ITM Technology 513
Rodney Allam, Vince White, VanEric Stein, Colin McDonald, Neil Ivens, Mark Simmonds
Chapter 31: Techno-economic Evaluation of an Oxyfuel Power
Plant Using Mixed Conducting Membranes 537
Dominikus Bu¨cker, Daniel Holmberg, Timothy Griffin
Chapter 32: Cost and Feasibility Study on the Praxair Advanced Boiler for the CO2 Capture
Project’s Refinery Scenario 561
Leonard Switzer, Lee Rosen, Dave Thompson, John Sirman, Hank Howard, Larry Bool
SECTION 3B: CHEMICAL LOOPING COMBUSTION (CLC) OXYFUEL TECHNOLOGY
Chapter 33: Chemical Looping Combustion (CLC) Oxyfuel Technology Summary 583
Paul Hurst, Ivano Miracca
Chapter 34: Development of Oxygen Carriers for Chemical-Looping Combustion 587
Juan Ada´nez, Francisco Garcı´a-Labiano, Luis F. de Diego, Pilar Gaya´n,
Alberto Abad, Javier Celaya
Chapter 35: Chemical-Looping Combustion—Reactor Fluidization
Studies and Scale-up Criteria 605
Bernhard Kronberger, Gerhard Lo¨ffler, Hermann Hofbauer
Chapter 36: Construction and 100 h of Operational Experience
of a 10-kW Chemical-Looping Combustor 625
Anders Lyngfelt, Hilmer Thunman
Chapter 37: Chemical Looping Combustion of Refinery Fuel Gas with CO2 Capture 647
Jean-Xavier Morin, Corinne Be´al
FUTURE RESEARCH NEEDS
Chapter 38: Capture and Separation Technology Gaps and Priority Research Needs 655
Helen R. Kerr
xi
VOLUME 2
SECTION 1: GHG, CLIMATE CHANGE AND GEOLOGICAL CO2 STORAGE
CO2 Storage Preface 663
Sally M. Benson
Chapter 1: Overview of Geologic Storage of CO2 665
Sally M. Benson
Chapter 2: Technical Highlights of the CCP Research Program on Geological Storage of CO2 673
S. Imbus
SECTION 2: STORAGE INTEGRITY
Storage Integrity Preface 685
Curtis M. Oldenburg
Chapter 3: Natural CO2 Fields as Analogs for Geologic CO2 Storage 687
Scott H. Stevens
Chapter 4: Natural Leaking CO2-Charged Systems as Analogs for Failed Geologic Storage Reservoirs 699
Zoe K. Shipton, James P. Evans, Ben Dockrill, Jason Heath, Anthony Williams,
David Kirchner, Peter T. Kolesar
Chapter 5: The NGCAS Project—Assessing the Potential for EOR and CO2 Storage
at the Forties Oilfield, Offshore UK 713
S.V. Cawley, M.R. Saunders, Y. Le Gallo, B. Carpentier, S. Holloway, G.A. Kirby,
T. Bennison, L. Wickens, R. Wikramaratna, T. Bidstrup, S.L.B. Arkley,
M.A.E. Browne, J.M. Ketzer
Chapter 6: Predicting and Monitoring Geomechanical Effects of CO2 Injection 751
Ju¨rgen E. Streit, Anthony F. Siggins, Brian J. Evans
Chapter 7: Geophysical and Geochemical Effects of Supercritical CO2 on Sandstones 767
Hartmut Schu¨tt, Marcus Wigand, Erik Spangenberg
Chapter 8: Reactive Transport Modeling of Cap-Rock Integrity During Natural
and Engineered CO2 Storage 787
James W. Johnson, John J. Nitao, Joseph P. Morris
Chapter 9: Natural Gas Storage Industry Experience and Technology: Potential Application
to CO2 Geological Storage 815
Kent F. Perry
Chapter 10: Leakage of CO2 Through Abandoned Wells: Role of Corrosion of Cement 827
George W. Scherer, Michael A. Celia, Jean-Herve´ Pre´vost, Stefan Bachu, Robert Bruant,
Andrew Duguid, Richard Fuller, Sarah E. Gasda, Mileva Radonjic, Wilasa Vichit-Vadakan
SECTION 3: STORAGE OPTIMIZATION
Storage Optimization Preface 851
Jos Maas
xii
Chapter 11: Long-Term CO2 Storage: Using Petroleum Industry Experience 853
Reid B. Grigg
Chapter 12: In situ Characteristics of Acid-Gas Injection Operations
in the Alberta Basin, Western Canada: Demonstration of CO2 Geological Storage 867
Stefan Bachu, Kristine Haug
Chapter 13: Simulating CO2 Storage in Deep Saline Aquifers 877
Ajitabh Kumar, Myeong H. Noh, Gary A. Pope, Kamy Sepehrnoori, Steven L. Bryant,
Larry W. Lake
Chapter 14: CO2 Storage in Coalbeds: CO2/N2 Injection and Outcrop Seepage Modeling 897
Shaochang Wo, Jenn-Tai Liang
Chapter 15: CO2 Conditioning and Transportation 925
Geir Heggum, Torleif Weydahl, Roald Mo, Mona Mølnvik, Anders Austegaard
Chapter 16: Materials Selection for Capture, Compression, Transport and Injection of CO2 937
Marion Seiersten, Kjell Ove Kongshaug
Chapter 17: Impact of SOx and NOx in Flue Gas on CO2 Separation,
Compression, and Pipeline Transmission 955
Bruce Sass, Bruce Monzyk, Stephen Ricci, Abhishek Gupta, Barry Hindin, Neeraj Gupta
Chapter 18: Effect of Impurities on Subsurface CO2 Storage Processes 983
Steven Bryant, Larry W. Lake
SECTION 4: MONITORING AND VERIFICATION
Monitoring and Verification Preface 999
Mike Hoversten
Chapter 19: Monitoring Options for CO2 Storage 1001
Rob Arts, Pascal Winthaegen
Chapter 20: Atmospheric CO2 Monitoring Systems 1015
Patrick Shuler, Yongchun Tang
Chapter 21: Detecting Leaks from Belowground CO2 Reservoirs Using Eddy Covariance 1031
Natasha L. Miles, Kenneth J. Davis, John C. Wyngaard
Chapter 22: Hyperspectral Geobotanical Remote Sensing for CO2 Storage Monitoring 1045
William L. Pickles, Wendy A. Cover
Chapter 23: Non-Seismic Geophysical Approaches to Monitoring 1071
G.M. Hoversten, Erika Gasperikova
Chapter 24: The Use of Noble Gas Isotopes for Monitoring Leakage of Geologically Stored CO2 1113
Gregory J. Nimz, G. Bryant Hudson
SECTION 5: RISK ASSESSMENT
Risk Assessment Preface 1131
Sally M. Benson
xiii
Chapter 25: Lessons Learned from Industrial and Natural Analogs for Health,
Safety and Environmental Risk Assessment for Geologic Storage of Carbon Dioxide 1133
Sally M. Benson
Chapter 26: Human Health and Ecological Effects of Carbon Dioxide Exposure 1143
Robert P. Hepple
Chapter 27: The Regulatory Climate Governing the Disposal of Liquid Wastes
in Deep Geologic Formations: A Paradigm for Regulations for the
Subsurface Storage of CO2? 1173
John A. Apps
Chapter 28: Prospects for Early Detection and Options for Remediation of Leakage
from CO2 Storage Projects 1189
Sally Benson, Robert Hepple
Chapter 29: Modeling of Near-Surface Leakage and Seepage of CO2 for Risk Characterization 1205
Curtis M. Oldenburg, Andre´ A.J. Unger
Chapter 30: Impact of CO2 Injections on Deep Subsurface Microbial Ecosystems and Potential
Ramifications for the Surface Biosphere 1217
T.C. Onstott
Chapter 31: Framework Methodology for Long-Term Assessment of the Fate of CO2 in the
Weyburn Field 1251
Mike Stenhouse, Wei Zhou, Dave Savage, Steve Benbow
Chapter 32: CO2 Storage in Coalbeds: Risk Assessment of CO2 and Methane Leakage 1263
Shaochang Wo, Jenn-Tai Liang, Larry R. Myer
Chapter 33: Risk Assessment Methodology for CO2 Storage: The Scenario Approach 1293
A.F.B. Wildenborg, A.L. Leijnse, E. Kreft, M.N. Nepveu, A.N.M. Obdam, B. Orlic,
E.L. Wipfler, B. van der Grift, W. van Kesteren, I. Gaus,
I. Czernichowski-Lauriol, P. Torfs, R. Wo´jcik
Chapter 34: Key Findings, Technology Gaps and the Path Forward 1317
Scott Imbus, Charles Christopher
Author Index 1323
Subject Index 1325
xiv
INTRODUCTION
David C. Thomas1 and Helen R. Kerr2
1
Advanced Resources International, Inc., Naperville, IL, USA 2
BP, plc., Sunbury-on-Thames, UK
BACKGROUND
The Intergovernmental Panel on Climate Change (IPCC), in its 1995 base-case estimate, predicted that
anthropogenic emissions will rise from 7.4 billion tonnes of carbon/year (GtC/yr) in 1997 to approximately
26 GtC/year in 2100. Stated in carbon dioxide units, this equates to 27.1 billion tonnes of carbon dioxide/year
(GtCO2/yr) in 1997 to over 95 GtCO2/yr by 2100. The IPCC also projects doubling of atmospheric CO2
concentration from the present level of 360 ppmv to about 720 ppmv by 2050. While the effects on global
climate are uncertain, many scientists agree that there could be serious environmental consequences [3].
In 1999, the US DOE completed a series of reviews on research needs for carbon sequestration. That review
defined three approaches to manage carbon entering the atmosphere:
. Use energy more efficiently to reduce combustion of carbon-based fuels.
. Increase use of low carbon emission and carbon-free fuels like nuclear and renewable energy sources
(solar energy, wind power, hydroelectric, and biomass combustion).
. Carbon sequestration to capture and securely store carbon emitted from global energy systems.
The technology roadmap developed by the US DOE identified key scientific needs and challenges to make
carbon sequestration practical [1].
. Separation and capture of CO2 from the energy system. Present processes for separating CO2 from
combustion exhaust (flue) gases are small scale and expensive. Substantial development is required to
make flue-gas separation an acceptable method. Converting the energy carrier from carbon compounds
to hydrogen with separation of CO2 is one approach. Separation of oxygen from air for use in combustion
to produce a high CO2 content flue gas is another feasible approach to capture CO2 without excessive
separation costs.
. Sequestration in geologic formations. CO2 can be stored in competent geologic formations that are
widespread and well understood. Oil and gas fields have been treated with CO2 to enhance production of
hydrocarbons for the past three decades. Modification of those techniques may lead to acceptable options
for CO2 storage. The energy industry has developed a good understanding of the types of geologic
formations that might be able to store significant quantities of CO2 for long periods of time. Deep coal
deposits that are viewed as economically unmineable may also be able to accept substantial amounts of
CO2 for storage. Deep saline aquifers exist widely around the world and are already used for CO2
sequestration purposes in Norway.
. Sequestration in the oceans. Oceans are the largest natural sink for CO2. Research on methods to
accelerate anthropogenic CO2 uptake by oceans is underway. The ideas are embryonic, fraught with
unknown environmental effects, and in need of careful study.
. Sequestration in terrestrial ecosystems. Capture and fixation of CO2 by plants is the main way that CO2 is
naturally removed from the atmosphere. It is estimated that plants already consume about a quarter of the
anthropogenic CO2 emitted annually. Research into accelerating plant uptake of CO2 and ways to make
storage more permanent are needed.
Carbon Dioxide Capture for Storage in Deep Geologic Formations, Volume 1
D.C. Thomas and S.M. Benson (Eds.)
q 2005 Elsevier Ltd. All rights reserved 1