Reactive transport LBM model for CO2 injection in fractured reservoirs

A geochemical LBM model has been developed to simulate the CO 2 injection in homogeneous porous media in our previous work. That model has the ability to investigate the coupled reactive transport processes with reactants and products ions transport, matrix dissolution, and dissolution induced porosity change. In the present work, the model is extended to study the reactive transport properties in "fractured" media. Two kinds of fractures are investigated: one is straightforward along the centerline, and the other is inclined. The reaction rate distribution and evolution are analyzed at different time steps. The dissolution property of fracture edges is also studied, the bottom edge dissolution rate is generally higher than that of the upper edge in inclined fractured media. The porosity change becomes more and more obvious with the increase of time steps, as well as the edge porosity profiles. For the different fracture width, the dissolution rate and edge porosity become higher with the increase of fracture width. All the results show that the present model has the capability to numerically investigate CO 2 injection and reactive transport in fractured reservoirs. HighlightsA LBM model is extended to study the CO2 reactive transport in fractured media.Two different kinds of fractures are involved in numerical cases.The distribution of dissolution rate and porosity are analysed and compared.The wider fracture can cause more intense dissolution and porosity increase.

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