伊朗库姆盆地原油地球化学特征

伊朗库姆盆地已发现2类成熟原油:1)卡山区块原油类异戊二烯中植烷与姥鲛烷均势;萜烷中以C₃₀藿烷为主,含有较高的Ts、C₃₀重排霍烷,γ蜡烷较低;甾烷中重排甾烷含量高。厄尔布尔士油田原油类异戊二烯含量低、植烷优势明显;萜烷中Ts、C₃₀重排霍烷含量较低,γ蜡烷含量较高;甾烷中重排甾烷含量低。油—油对比表明,原油来自2套不同沉积环境的源岩,展示了伊朗库姆盆地内具有良好的烃源条件。 

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,C_(30)-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,C_(30)-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.