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Journal of Porous Media
Factor de Impacto: 1.752 Factor de Impacto de 5 años: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN En Línea: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019025077
pages 1065-1078

DEPENDENCE ON TEMPERATURE AND SALINITY GRADIENTS AND THE INJECTION RATE OF CO2 STORAGE IN SALINE AQUIFERS WITH AN ANGULAR UNCONFORMITY

Azadeh Pourmalek
Fluid and Complex Systems Research Centre, Coventry University, UK
Seyed M. Shariatipour
Fluid and Complex Systems Research Centre, Coventry University, Coventry, UK

SINOPSIS

An unconformity surface is a type of interface between an aquifer and a caprock. It refers to a buried erosional or non-depositional surface that separates two strata of different ages, indicating that sediment deposition has not been continuous. A high- or low-permeability layer may exist just above or below the unconformity surface. The high-permeability layer could be the result of the weathering and erosion of the older layer, or the deposition of coarsegrained sediments on top of the unconformity surface. The effect of this interface on CO2 dissolution in brine was investigated by running a range of 2D models and considering different injection scenarios. By examining different injection scenarios using two models for comparative analysis (one with and one without a high-permeability layer), the results provide a good hypothesis of the effects of pressure and migration distance on CO2 dissolution. Although the high-permeability layer creates a pathway for the further migration of CO2, the models without a high-permeability layer have tended to predict a higher CO2 dissolution in almost all the injection scenarios. In addition, the sensitivity of CO2 dissolution to aquifer parameters, such as temperature and salinity gradients, was examined. Models with and without temperature and salinity gradients were compared, and the importance of these parameters on the prediction of CO2 storage was determined. Another significant result is that under higher injection scenarios, the models show significant sensitivity to temperature and salinity gradients. However, for lower injection rates the sensitivity of the dissolved CO2 to temperature and salinity gradients is almost negligible.

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