In general, wettability characterization of organic shales is important for selecting fracturing and treatment fluids, investigating residual phase saturation and its pore‐scale topology, investigating the occurrence of water blockage at fracture face, and selecting relevant capillary pressure and relative permeability models for reservoir engineering calculations. Clay hydration, microfracture induction, lamination, and osmotic effect are collectively responsible for the excess water uptake, which is discussed in this chapter. The chapter presents various experimental evidences to discuss the parameters that control water flow in gas shales. The chapter compares the water/oil affinity of intact and crushed samples. It also compares the wettability of intact and crushed samples, using the concept of dimensional analysis. The imbibition experiments reported here were conducted on dry shale samples while in situ shales may have some initial water saturation. The experimental data presented in the chapter demonstrate the complexity of liquid flow in gas shales.