GEOCHEMICAL CHARACTERISTICS OF OIL IN THE QOM BASIN OF IRAN

It is maturated oil that two kinds of crude oil have been discovered in the Qom Basin of Iran.The abundance of isoprenoidies is relatively low,and no preference between pristane and phytane of crude oil in the Kashan block.There are relatively high abundance of Ts,C₃₀-diahopane and low abundance of gammacerane in trepans.There is relatively high concentration of diacholestane in steranes.The abundance of isoprenoidies is relatively high, and there is preference phytane of crude oil in the Alborz oilfield.There are relatively low abundance of Ts,C₃₀-diahopane and high abundance of gammacerane in trepans.There is relatively low concentration of diacholestane in steranes.These geochemical characteristics of crude oils show that they generated from different of sediment.It indicates that there are good conditions of source rock.