西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (1): 91-97.DOI: 10.3863/j.issn.1674-5086.2009.01.023

• 石油与天然气工程 • Previous Articles     Next Articles

THE THEORY AND CONDITIONS OF GEOLOGICAL STORAGE OF CO2

XU Zhi-gang1 CHEN Dai-zhao1 ZENG Rong-shu1 GUO Kai2 WANG Xu1   

  1. 1.Institute of Geology and Geophysics,CAS,Beijing 100029,China;2.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-02-20 Published:2009-02-20

Abstract:

At present,injecting CO2 into the subsurface oil and gas reservoirs,deep saline aquifers and disused coal-beds to store CO2 in subsurface is the most valid and economic choice in reducing the CO2 emission into the atmosphere.Several factors should be considered during the operation of CO2 geological storage in the reservoirs as mentioned above.Once injecting CO2 as a compressed liquid into the subsurface reservoirs,partial CO2 will be retained due to physical and geochemical trapping.The most effective storage sites are those where CO2 is trapped permanently under a thick,low-permeability caprock,or is adsorbed on the surface of coal micropores,or is converted to solid minerals through interactions of physical and chemical processes.No matter what reservoirs will be chosen to the subsurface geological storage of CO2,some criteria should be met,including adequate storage capacity,regionally stable caprock,confined hydrologic system,stable compartment without risks of leakage and well-established industry and infrastructure and societal issues (i.e.,level of development,economy,environmental concerns,public education and attitudes).However,due to difference of physical and chemical properties of storage media,different strategies should be adopted during operation of subsurface CO2storage.

Key words: CO2, oil and gas reservoirs, coalbeds, saline aquifers, theory of geological storage, conditions of geological storage

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