1. A computer-implemented method comprising: simulating, by a computer system, movement of hydrocarbons through a micro-scale model of a kerogen-rich layer of a layered shale formation; determining, by the computer system, a permeability of the kerogen-rich layer of the layered shale formation based on the simulation through the micro-scale model; determining, by the computer system, a permeability of a kerogen-poor layer of the layered shale formation based on a well log obtained for the layered shale formation; adjusting, by the computer system, parameters of a macro-scale model for use with the layered shale formation, based on the respective permeabilities of the kerogen-rich and kerogen-poor layers of the layered shale formation; and predicting hydrocarbon production for drilling a wellbore within the layered shale formation, based on the adjusted parameters of the macro-scale model.