Coal seams are an alternative storage options besides depleted oil and gas reservoirs and deep saline formations. They are suitable to different degrees for CO2 geological storage as a result of various intrinsic and extrinsic. The potential use of this geological media requires suitability assessment and the amount of CO2 can be stored. This paper presents the fi rst attempt to evaluate the characteristics of coal seams in Rambutan Field, South Sumatera, in terms of their suitability for CO2 storage and the potential storage capacity. A set of 5 semi-qualitative criteria has been developed for the assessment of 4 seams that includes permeability, coal geometry, structure, homogeneity and depth. CO2 adsorption capacity estimates were derived from laboratory experiment by employing Isothermal Langmuir. The results show the 4 seams in general are suitable for CO2 storage. The adsorption capacity from seam 2, 3, 5 and P are 22.18, 25.09, 24.53, and 34.12 m 3/t dry-ash-free basis respectively. The highest CO2 storage capacity can be stored at seam P enabling the CO2 in dense phase (supercritical).
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