辽河西部凹陷沙河街组烃源岩特征及油源精细对比
惠沙沙 , 庞雄奇 , 柳广弟 , 周晓龙 , 胡涛 , 梅术星
地球科学 ›› 2023, Vol. 48 ›› Issue (08) : 3081 -3098.
辽河西部凹陷沙河街组烃源岩特征及油源精细对比
Characteristics of Paleogene Source Rocks and Fine Oil-Source Correlation in Liaohe Western Depression
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为了明确辽河西部凹陷南北部烃源岩条件差异、查明凹陷内不同地区原油来源,采用TOC、岩石热解、R o、饱和烃色谱-质谱等方法对不同洼陷烃源岩及原油特征分析并进行精细油源对比. 结果表明,西部凹陷沙四段烃源岩在北部发育(厚约700 m)、有机质丰度高、但成熟度较低(R o<0.5%), 有机质以陆源高等植物为主,混有少量低等水生生物,沉积于偏还原的咸水-微咸水环境;沙三段及沙一段烃源岩在凹陷南部更为发育,丰度高且成熟度高,有机质以低等水生生物为主,沉积于偏氧化的淡水环境. 结果表明,北部原油来自于沙四段烃源岩;中部原油主要来自于沙三段烃源岩(冷家地区原油存在少量沙四段原油混入),而南部原油主要来自于沙三段和沙一段烃源岩.
辽河西部凹陷 / 烃源岩评价 / 地化特征 / 油源对比 / 生物标志化合物 / 石油地质
Liaohe Western Depression / source rock evaluation / geochemical characteristics / oil-source correlation / biomarker / petroleum geology
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国家重点基础研究发展计划(973计划)项目(2011CB201102)
中国石油科技项目(HX20180604)
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