Previous studies on carbon materials have shown that surface functional groups can have critical impacts on their wettability (Deheryan et al. 2014). Therefore, the variation in chemical structure and bonding of kerogen during thermal maturity can modify its wettability characteristics. Wettability studies on coal show that among oxygen-containing functional groups, carboxyl group is shown to increase water-wettability of coal surface . Kerogen composition is also variable between different types of kerogen (van Krevelen 1961), which would have an impact on its wettability. However, the impacts of kerogen type, functional groups and reservoir temperature and pressure on kerogen wettability are still not well understood and need to be quantified. Therefore, experimental wettability studies on pure kerogen are crucial. Experimental measurements alone might not be sufficient for addressing the aforementioned challenges and can hardly cover a wide and continuous range of kerogen and environment properties.