岩性油气藏 ›› 2014, Vol. 26 ›› Issue (3): 101108.doi: 10.3969/j.issn.1673-8926.2014.03.017
卢学军1,高平2,3,丁修建2,3,陈哲龙2,3,柳广弟2,3
LU Xuejun1, GAO Ping 2,3, DING Xiujian 2,3, CHEN Zhelong 2,3, L IU Guangdi 2,3
摘要:
阿尔凹陷是二连盆地的一个次级构造单元,勘探程度较低。 下白垩统为二连盆地的主力烃源岩和产油层,在阿尔凹陷广泛发育。 有机地球化学分析表明,阿尔凹陷下白垩统烃源岩有机质丰度高,以Ⅰ—Ⅱ 型为主,低成熟—成熟,已进入大量生烃阶段,其中腾一段烃源岩生烃能力最强,阿四段烃源岩生烃能力稍差;下白垩统烃源岩主要为淡水—微咸水环境,腾一段为偏强还原—弱氧化环境,阿四段为偏弱氧化环境;烃源岩常规甾烷分布特征为 C29>C27>C28,表明其具有以藻类输入为主、陆源有机质输入为辅的生源特征,而腾一段生源输入的差异可能与湖侵及湖退引起的水体深度变化有关。 下白垩统油砂和烃源岩样品的生物标志化合物特征对比表明,腾一段原油来源于腾一段烃源岩,阿尔善组原油可能主要来源于腾一段烃源岩,混有阿四段的油源。
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