Similar measurements were performed on kerogen samples isolated from formation B. The results of measurements in formation B indicate that non-heated kerogen from formation B is neutral-wetting with a contact angle of 111°. As the heat-treatment temperature of kerogen increases to 450°C, the contact angle of kerogen increases to 116°. As the heat-treatment Increase in thermal maturity of kerogen leads to chemical restructuring and loss of hydrogen, which results in increase in aromaticity and transformation of kerogen into graphene sheets functionalized groups in kerogen makes kerogen polar and therefore hydrophilic in nature. This theory is consistent with our observations that kerogen samples at high thermal maturity (low O/C ratio) are hydrophobic and that kerogen samples at low thermal maturity (high O/C ratio) are hydrophilic.