Abstarct: Shale gas is a group of dark-colored compact clay-organic rich rocks. These resources due to the high organic matter are as a source rock in a petroleum system. Shale gas reservoirs are a kind of unconventional gas reservoirs. Organic geochemical analysis of shale gas potential is considered in the evaluation unconventional resources. In the current study the organic geochemistry results in Lurestan area has used for two formations of Sargelu and Garau. Evaluation of the kerogen type and maturity of organic matter in the two formations help to assess production potential and residual potential. The results of Vitrinite reflectance measurements (Ro) accompany together with TR was used to evaluate the shale gas potential. baxse on the gas chromatography results, environmental condition was studied. The final evaluation of Garau and Sargelu Formations were done baxsed on the spider diagrams (Risk Plot). These two formation were compared with some of the world's known shale gas resources (such as Barnett Shale), as a benchmark at the end. baxsed on the results we can say that two formations have some of the features for economic shale gas. The best Sargelu wells to production are in the northern regions of Lorestan (Mahidasht, Shahabad, Huleyian) and the best Garau wells are in the North and Southwest of Lorestan (Mahidasht, Shahabad, Vizhenen, Kabirkuh, Anjir). Some other features for shale gas evaluation need more details and specific measurements.