The transport of subsurface fluids such as hydrocarbons, groundwater, geothermal, and brines in porous media is very complicated in terms of modelling and numerical simulation because of the complexity of fluids and/or rock systems. Despite the remarkable progress in the numerical modelling and simulation of flow in subsurface reservoirs, extensive works are still necessary for further improvement of modelling and calculation algorithms. For example, shale-gas reservoirs have very complicated and unpredictable structures with a considerable lack of modelling knowledge. Another example may be related to carbon dioxide sequestration in depleted conventional reservoirs. These topics and many others need intensive efforts and research to achieve good models that incorporate the essential physics and thermodynamics. Therefore, the door is still open for enhancement of our modelling capabilities and numerical algorithms related to the transport of geofluids in both conventional and unconventional reservoirs.

On the other hand, with the latest advances in the efficiency of computers along with the rapid development of relevant technologies, it is our belief that modelling and simulation of geofluids transport, even at the basic level, can still benefit from these advances. Furthermore, new emerging topics or solution methodologies always strike our attention for evaluation, assessment, and investigation. These include, for example, modelling of fractured rock systems involving wells, pore-scale and Darcy-scale modelling as well as coupling strategies. Modern enhanced oil recovery/exploration techniques involving nanoparticles injection with/without magnetic field are still challenging for mathematical modelling. Likewise, computational aspects such as stability analysis and error estimation are hard to perform on account of the complexity of the models. In fact, several recent models suffer a lack of such kind of analysis. Multi-purpose models, including multi-physics, multi-scale, and multi-domain, are required to give a full image to understand the transport of geofluids. Many limitations can also be counted in the field of modelling and simulation of geofluids transport in conventional and unconventional reservoirs.

This Special Issue aims to highlight the recent advances and developments in modelling and simulation of geofluids transport in conventional and unconventional reservoirs. We invite researchers to contribute to this Special Issue in the form of original research and review articles.

Potential topics include but are not limited to the following:

• Numerical modelling of fluid flow in porous media
• Numerical modelling of fractured reservoirs
• Modelling and simulation of carbon dioxide sequestration
• Physical/mathematical models to describe flow and transport in reservoirs
• Multiscale modelling of flow and transport in reservoirs
• Multiscale modelling of flow and transport in well regime
• Modelling and simulation of enhanced geo-modelling system
• Modelling of secondary and tertiary EOR
• Calculations of thermodynamics of hydrocarbons in reservoirs
• Modelling of multicomponent transport in reservoirs
• Modelling of shale gas reservoirs
• Meshless particle methods for fluid flow in porous structures
• Modelling of coal seam gas