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Abstract
The Persian Gulf is one the most important basins of the world because more than 60% of the oil reserves and 30% of the gas resources of the world were accumulated in this region. Several giant hydrocarbon reservoirs are formed in a place in which all of the petroleum plays are available. A solid understanding of organic geochemical characteristics of talented formations conducts future studies and decisions to an accurate way for studying the generation, migration, and entrapment of the hydrocarbons. Kangan and Dalan Formations, two important formations in the South Pars Gas Field, are studied from the stand point of hydrocarbon potential using Rock-Eval Pyrolysis, mineralogy, and organic petrography of core samples. The results point to the distribution of kerogen type III as the dominant type with a contribution of type II/III, while their maturity stage is early catagenesis in terms of oil generation. The organic petrography indicates that the mean value of vitrinite reflectance of the samples ranges between 0.57 and 0.87, which is another evidence for fair maturity of Kangan and Dalan Formations. In the last part of the research, the abundance of special minerals, including illite and chlorite, is investigated in Kangan and Dalan because mineralogy is a key for studying the thermal history of sediments. Illite is introduced as the dominant mineral of the formations due to the results of mineralogy analysis using seven thick sections of the samples, which implies that some thermal maturity-linked processes were happened for the studied formations.