Sde De: please, get the landmark article "Thermal maturity of the Barnett Shale determined from well-log analysis April 2007 · AAPG Bulletin 91(4):535-549 DOI · 10.1306/10270606060" by Hank Zhao, Brad Curtis, and Natalie Givens. They said: "Maturity index was calculated using three types of open-hole logs: neutron porosity, deep resistivity, and density porosity (or bulk density)."
in addition to the previous answer, temperature log and mud log may be used to identify thermal maturity and improve basin model. Drilling cuttings may be used for VRo measurements.