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Available to DOE and DOE contractors from the OfficeAbstract--A global model for the generation of oil and gas from petroleum source rocks is presented. The model consists of 13 chemical species and 10 reactions, including an altematepathway mechanism for kerogen pyrolysis. Reaction rate parameters and stoichiometry coefficients determined from a variety of pyrolysis data are given for both type I and type II kerogen.Use of the chemical reaction model is illustrated for typical geologic conditions.