The method of Steam Assisted Gravity Drainage becomes increasingly important for heavy oil recovery. In addition to the heat conduction from steam to oil, this process is also associated with chemical reactions in the reservoirs, called aquathermolysis which produce the highly toxic and corrosive acid gas H2S. The overall objective of this work is to simulate a reservoir experiencing aquathermolysis reactions by building and using a numerical model based on a meandering fluvial reservoir. To focus on this type of reservoirs, we built an upscaled 2D reservoir model based on 3D outcrop observations of the Scalby Formation, using a strictly dead oil, without any possibility to add aquathermolysis reactions at this time. Our H2S prediction is based on a simplified reactive scheme of 4 reactions. It describes the oil as a mixing of the following pseudo-components: Asphaltenes, Resins, Aromatics and Saturates. It also takes into account, as a pseudo-component, a solid organic material called pyrobitumen, which is produced during aquathermolysis. This reactive scheme is derived from several aquathermolysis experiments that were carried out on an oil sand sample from Foster Creek Project in Athabasca. Finally the reactive scheme was coupled with a fluid thermodynamic compositional description.


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