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支链甘油四醚膜类脂化合物在油气地表化探中的应用初探—以济阳坳陷油气田为例

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Keywords: 支链甘油四醚膜,类脂化合物,油气地表化探,济阳坳陷渗漏

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Abstract:

?来源于细菌的支链甘油四醚膜类脂化合物(brGDGTs),首先发现于泥炭中,是一种分布广泛、易于检测的重要生物标志化合物.研究了brGDGTs在济阳坳陷垛石桥地区150cm深度土壤中的分布,结果在各样品中均检测到了brGDGTs化合物,总体含量为4.0~73.0ngg-1,显示brGDGTs在空白对比区含量较低,而在油气藏区和夏口断层处含量明显升高.brGDGTs含量与油气田区分布以及酸解烃指标(乙烷含量)都具有良好的对应关系,表明研究区油气藏上覆土壤中brGDGTs含量同下伏油气藏油气的渗漏密切相关;并且相比于酸解烃等传统化探指标,brGDGTs化合物稳定性更强,可以记录历史时期烃类渗漏,因此brGDGTs可能发展成为一类重要的油气地表化探指标.

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