Abstract
The fluid injection in sedimentary formations may generate geochemical interactions between the fluids and the rock minerals, e.g., CO2 storage in a depleted reservoir or a saline aquifer. To simulate such reactive transfer processes, geochemical equations (equilibrium and kinetics equations) are coupled with compositional flows in porous media in order to represent, for example, precipitation/dissolution phenomena. The aim of the decoupled approach proposed consists in replacing the geochemical equilibrium solver with a substitute method to bypass the huge consuming time required to balance the geochemical system while keeping an accurate equilibrium calculation. This paper focuses on the use of artificial neural networks (ANN) to determine the geochemical equilibrium instead of solving geochemical equations system. To illustrate the proposed workflow, a 3D case study of CO2 storage in geological formation is presented.
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Guérillot, D., Bruyelle, J. Geochemical equilibrium determination using an artificial neural network in compositional reservoir flow simulation. Comput Geosci 24, 697–707 (2020). https://doi.org/10.1007/s10596-019-09861-4
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DOI: https://doi.org/10.1007/s10596-019-09861-4
Keywords
- Reservoir simulation
- Compositional
- Heterogeneity
- CO2 storage
- Chemically reacting flows
- Artificial neural network