At Weyburn (Canada), the long-term behavior of the CO2Carbon dioxide and leakage(in CO2 storage) The escape of injected fluid from the storage formation to the atmosphere or water column risks at were assessed within a methodological framework based on the FEPs (Stenhouse et al., 20052005 - M. J. Stenhouse, W. Zhou, D. Savage and S. BenbowFramework methodology for long-term assessment of the fate of CO2 in the Weyburn fieldsee more). The Quintessa FEP database was initially developed for this application. A number of simulations were performed. Fully probabilistic calculations find a 95% probability that the cumulative amount of CO2Carbon dioxide released after 5,000 years will be less than 1% of the total amount stored (Walton et al., 20042004 - F. B. Walton, J. C. Tait, D. LeNeveu and M. I. SheppardGeological Storage of CO2: a Statistical approach to assessing performance and risksee more). A deterministic model for transport in the reservoirA subsurface body of rock with sufficient porosity and permeability to store and transmit fluids with probabilistic model for leakage(in CO2 storage) The escape of injected fluid from the storage formation to the atmosphere or water column through wells shows a maximum release of 0.14% of the total amount of CO2Carbon dioxide stored (Zhou et al., 20042004 - W. Zhou, M. J. Stenhouse, R. Arthur, S. Whittaker, D. H.-S. Law, R. Chalaturnyk and W. JazrawiThe IEA Weyburn CO2 Monitoring and Storage Project - Modeling of the Long-Term Migration of CO2 from Weyburnsee more). The Weyburn riskConcept that denotes the product of the probability of a hazard and the subsequent consequence of the associated event analysis indicated that the most probable path for transmission of CO2Carbon dioxide from one stratum to another or to the biosphere is along a wellManmade hole drilled into the earth to produce liquids or gases, or to allow the injection of fluids bore. Therefore, wells must be carefully drilled and monitored. Application of the CQ-1 program based on simulations showed that CO2Carbon dioxide may migrate from the initial formationA body of rock of considerable extent with distinctive characteristics that allow geologists to map, describe, and name it tending to dissolve in the aquifers above the reservoirA subsurface body of rock with sufficient porosity and permeability to store and transmit fluids. Based on the Monte CarloA modelling technique in which the statistical properties of outcomes are tested by random inputs simulation method, after 5,000 years, the mean release to the biosphere of CO2Carbon dioxide in place will be 0.2%. 5-34% of CO2Carbon dioxide initially in place in the Weyburn formationA body of rock of considerable extent with distinctive characteristics that allow geologists to map, describe, and name it will migrate to upper and lower aquifers. There is 95% probability that 98.7-99.5% of the initial CO2Carbon dioxide in place will remain stored in the geosphereThe earth, its rocks and minerals, and its waters for 5,000 years (Deel et al., 20072007 - D. Deel, K. Mahajan, C. Mahoney, H. McIlvried and R. SrivastavaRisk Assessment and Management for Long-Term Storage of CO2 in Geologic Formations - United States Department of Energy R&Dsee more).