天然气地球科学 ›› 2021, Vol. 32 ›› Issue (3): 334346.doi: 10.11764/j.issn.1672-1926.2020.11.017
马安来1(),林会喜1,云露2,曹自成2,朱秀香2,李王鹏1,吴鲜2
An-lai MA1(),Hui-xi LIN1,Lu YUN2,Zi-cheng CAO2,Xiu-xiang ZHU2,Wang-peng LI1,Xian WU2
摘要:
塔里木盆地顺北地区奥陶系超深层一间房组—鹰山组获得了工业油气产能,不同断裂带油气相态存在差异。使用色谱?质谱、色谱×色谱?飞行时间质谱方法研究了顺北地区原油中金刚烷的分布及含量。顺北地区奥陶系原油金刚烷组成中,1号断裂带(分支断裂、次级断裂)和3号断裂带原油单金刚烷相对含量高于5号断裂带和7号断裂带原油。顺北地区原油金刚烷总量与4?甲基二苯并噻吩/1?甲基二苯并噻吩值之间呈现正相关关系,表明成熟度决定了原油中金刚烷总量。不同断裂带原油中单金刚烷系列、双金刚烷系列相对比例的不同与油气藏多期成藏及油气藏保存条件不同有关。1号断裂带油气藏喜马拉雅晚期较高成熟度天然气的充注,从深部携带了较高比例的单金刚烷系列,造成原油单金刚烷系列含量相对较高。5号断裂带油气藏保存条件逊色于1号断裂带油气藏,轻质组分不同程度损失,导致原油中单金刚烷比例较低。由于金刚烷内组成含量的差异,分别使用22 μg/g、33 μg/g作为1号断裂带、5号断裂带原油中甲基双金刚烷基线,1号断裂带(含分支、次级断裂带)、5号断裂带中段及5号断裂带南段原油裂解比例分别为0~42%、20%~33%和54%。
中图分类号:
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