Impact of mineralogical heterogeneity on reactive transport modelling

Autor: Min Liu, Peyman Mostaghimi, Mehdi Shabaninejad
Rok vydání: 2017
Předmět:
Zdroj: Computers & Geosciences. 104:12-19
ISSN: 0098-3004
DOI: 10.1016/j.cageo.2017.03.020
Popis: Impact of mineralogical heterogeneity of rocks in reactive modelling is investigated by applying a pore scale model based on the Lattice Boltzmann and Finite Volume Methods. Mass transport, chemical reaction and solid structure modification are included in the model. A two-dimensional mineral map of a sandstone rock is acquired using the imaging technique of QEMSCAN SEM with Energy-Dispersive X-ray Spectroscopy (EDS). The mineralogical heterogeneity is explored by conducting multi-mineral reaction simulations on images containing various minerals. The results are then compared with the prediction of single mineral dissolution modelling. Dissolution patterns and permeability variations of multi-mineral and single mineral reactions are presented. The errors of single mineral reaction modelling are also estimated. Numerical results show that mineralogical heterogeneity can cause significant errors in permeability prediction, if a uniform mineral distribution is assumed. The errors are smaller in high Pclet regimes than in low Pclet regimes in this sample. Effect of mineralogical heterogeneity on reactive transport was investigated.Mineral map of sandstones was acquired using QEMSCAN SEM-EDS.Lattice Boltzmann and Finite Volume Methods were applied to model reactive transport.Pore-scale simulations of multi-mineral reaction were performed directly on rock images.
Databáze: OpenAIRE
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