Estimation of formation properties based on borehole fluid and drilling logs

A system for estimating one or more properties of an earth formation, the system comprising:

• a carrier configured to be disposed in a borehole in an earth formation as part of an energy industry operation;
• an analysis unit configured to receive borehole fluid from the borehole, the borehole fluid including at least injection fluid injected into the borehole, the analysis unit configured to estimate at least one property of the borehole fluid associated with one or more intervals along the borehole and generate a mud log that indicates values of the at least one property at the one or more intervals, the at least one property including at least one of gas content and cuttings content;
• and
• a processor configured to perform:
• estimating one or more properties of the formation based on the mud log, the one or more properties selected from at least one of lithology, permeability, total organic carbon and brittleness;
• and
• controlling one or more operational parameters of the energy industry operation based on the one or more properties of the formation,
• wherein the energy industry operation is a drilling operation, the injection fluid includes drilling fluid, and the borehole fluid includes the drilling fluid and cuttings generated by the drilling operation, estimating the one or more properties of the formation includes analyzing the cuttings to determine relative amounts of rock types and mineral types, and generating a cuttings log indicating the relative amounts.