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Saitama, Japan

Ikeda S.,Oyo Corporation OYO | Ohoka M.,Oyo Corporation OYO | Tomimori S.,Oyo Corporation OYO | Hishida S.,Oyo Corporation OYO | And 7 more authors.
Energy Procedia | Year: 2013

This paper describes our evaluation of CO2 storage potential, injectivity and uncertainly, with a focus on CO2 sealing efficiency, through numerical analysis using TOUGH2/ECO2N applied to a feasibility study site (which we call "Site D"). In the first step, we examined previous geological survey data and a geological model created to predict feasibility of the study sites. Storage potential of selected areas, the number of required injection wells and their arrangement, and CO2 migration in the proposed site were examined through simulation with TOUGH2/ECO2N [1]. Secondly, to create a conceptual model, we simplified the geological situations at the injection point and carried out a sensitivity analysis for understanding the uncertainty. The sensitivity analysis revealed that permeability, capillary pressure, layer thickness, and modeling of the alternating layers will greatly affect our results. Through this numerical analysis focused on sealing efficiency, we estimate the maximum amount of injectable CO2 in Site D at 1 million tons per well.

Ohoka M.,Oyo Corporation OYO | Araya T.,Oyo Corporation OYO | Nakamura M.,Oyo Corporation OYO | Nishiyama S.,Oyo Corporation OYO | And 9 more authors.
Energy Procedia | Year: 2013

We have investigated storage potential in a feasibility study of a CO 2 geologic storage system design. This study is a part of a research project titled -Innovative Zero-emission Coal Gasification Power Generation||. In commercial use cases, the total amount of CO2 storage is approximately 30 million tons, which means that the annual amount of CO 2 storage is 1.54 million tons in a 20-year injection cycle. In the case of large-scale CO2 storage, the total amount of CO2 storage is assumed to be 200 million tons; the annual amount of CO2 storage is 10 million tons in a 20-year cycle. We selected three reservoir sites-sites A, B, and C-as commercial use cases. An additional site, Site D, was selected as a large-scale CO2 storage site. the storage capacities of aquifers distributed in 4 sites, sites A, B, and C as commercial use cases and site D as large-scale CO2 storage case, were evaluated. Additionally, injectivity and long-term behavior were examined through numerical analyses. These results indicated the possible of sites A, B, and C as commercial use and site D as large-scale CO2 storage. This paper describes the site selection, geological characterization, and CO2 storage potential of sites selected for case studies.

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