Long term permeation and diffusion of gas in coal reservoirs
Coal seams have high capacity for storage of carbon dioxide (CO2) and methane (CH4) which are the two main constituents of coal seam gas (CSG). These gases, which are produced during coalification process or in secondary processes by other mechanism, are retained in coal seams over long geological times. The retention is conditional on the existence of suitable seals and trapping mechanisms. Adequate roof and floor strata would make a coal formation to act as a high capacity and compact gas reservoir. The trapping capacity of the roof and floor can be evaluated in terms of the gas leak rate or volumes of gas escaped from the reserveoir over a given period of time (a relatively long time in the case of anthropogenic CO2 storage). In the long term the magnitude of the escaped volume would depend on the micro flow properties of the seal rocks. This paper reports some results of a study on the matrix permeability and diffusivity of rock horizons in the roof and floor of a coal seam formation to establish the quality of the reservoir for CO2 storage.
coal seam gas cap rock matriz permeability diffusivity CO2 storage
A. Saghafi
CSIRO Division of Energy Technology, P. O. Box 330, Newcastle, NSW 2300, Australia
国际会议
徐州
英文
144-149
2009-09-24（万方平台首次上网日期，不代表论文的发表时间）