The objective of the project is to improve the understanding of the flow behavior of natural gas and introduced fluids (water, surfactant solutions and polymers) in the nano-darcy range of tight gas and shale formations by using advanced single-molecule imaging system combined with nano-fluidic chips and pore-scale numerical simulation techniques. Specifically, the Subcontractor will examine the flow behavior of gas and introduced fluids in the nano-scale pores and cracks in tight formations and study the effect of introduced fluids on natural gas transportation properties, such as capillary pressure, absolute permeability, relative permeability, non-Darcy flow. The difference of fluid flow in shale and tight sand formations will also be identified.