Classification of CO2 geologic storage; resource and capacity

The use of the term capacity to describe possible geologic storage implies a realistic or likely volume of CO2 to be sequestered. Poor data quantity and quality may lead to very high uncertainty in the storage estimate. Use of the term "storage resource" alleviates the implied certainty of the term... Full description

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doi: 10.1016/j.egypro.2009.02.029
Authors:Frailey, S.M.; Finley, R.J.
Volume Title:Greenhouse gas control technologies conference 9
Volume Authors:Gale, J., editor
Source:Energy Procedia, 1(1), p.2623-2630; Greenhouse gas control technologies conference 9, Washington, DC, Nov. 16-20, 2008, edited by J. Gale, H. Herzog and J. Braitsch. Publisher: Elsevier, International. ISSN: 1876-6102
Publication Date:2009
Note:In English. 3 refs.; illus.
Subjects:Carbon dioxide; Carbon sequestration; Fluid injection; Petroleum engineering; Pore pressure; Salt water; Storage
Record ID:2020050480
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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The use of the term capacity to describe possible geologic storage implies a realistic or likely volume of CO2 to be sequestered. Poor data quantity and quality may lead to very high uncertainty in the storage estimate. Use of the term "storage resource" alleviates the implied certainty of the term "storage capacity". This is especially important to non- scientists (e.g. policy makers) because "capacity" is commonly used to describe the very specific and more certain quantities such as volume of a gas tank or a hotel's overnight guest limit. Resource is a term used in the classification of oil and gas accumulations to infer lesser certainty in the commercial production of oil and gas. Likewise for CO2 sequestration, a suspected porous and permeable zone can be classified as a resource, but capacity can only be estimated after a well is drilled into the formation and a relatively higher degree of economic and regulatory certainty is established. Storage capacity estimates are lower risk or higher certainty compared to storage resource estimates. In the oil and gas industry, prospective resource and contingent resource are used for estimates with less data and certainty. Oil and gas reserves are classified as Proved and Unproved, and by analogy, capacity can be classified similarly. The highest degree of certainty for an oil or gas accumulation is Proved, Developed Producing (PDP) Reserves. For CO2 sequestration this could be Proved Developed Injecting (PDI) Capacity. A geologic sequestration storage classification system is developed by analogy to that used by the oil and gas industry. When a CO2 sequestration industry emerges, storage resource and capacity estimates will be considered a company asset and consequently regulated by the Securities and Exchange Commission. Additionally, storage accounting and auditing protocols will be required to confirm projected storage estimates and assignment of credits from actual injection. An example illustrates the use of these terms and how storage classification changes as new data become available.