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尽管对原油中高分子量化合物的形成途径有多种解释, 但其真正来源并不很清楚. 通过对辽河盆地大民屯凹陷典型高蜡油区不同性质源岩抽提物中显晶蜡和微晶蜡含量和组成的定量分析, 并结合源岩有机岩石学和热解色谱特征分析, 揭示富含低等水生生物的油页岩是大民屯凹陷高蜡油的主要母源. 高蜡油的主要生源组分是藻类体和无定形基质体, 它们富含脂肪族结构, 生成长链烷烃的潜力很高. 源岩蜡产率受有机质丰度和成熟度的控制, 高丰度和低成熟源岩有利于蜡的形成与保存, 随源岩有机质丰度降低和成熟度增高, 源岩蜡产率降低, 表明原油中的蜡主要是富含低等水生生物有机质在热演化阶段早期(RO = 0.4%~0.7%)形成的产物. 尽管陆源高等植物的表皮和孢粉类同样能够提供蜡的生源母质, 但湖相低等水生生物的贡献可能更加重要.
Although there are many explanations for the formation of high molecular weight compounds in crude oil, the true source is not clear.According to the crystal wax and microcrystal of different nature source rocks in the typical high-wax oil area of Damintun depression in Liaohe Basin, Wax content and composition, combined with the characteristics of organic petrology and pyrolysis chromatogram of source rocks, it is revealed that the oil shale rich in lower aquatic organisms is the main source of high waxy oil in Damintun depression. The main source components are algae and amorphous matrix, which are rich in aliphatic structure and have high potential to generate long-chain alkanes.The source rock wax yield is controlled by the abundance and maturity of organic matter, with high abundance and low maturity The formation and preservation of wax are beneficial to wax formation. With the reduction of organic matter abundance and maturity of source rock, the yield of wax in source rock decreases, indicating that the wax in crude oil is mainly enriched in lower aquatic organisms. During the early stage of thermal evolution (RO = 0.4% -0.7%) .Although the epidermis and sporopollen of terrestrial higher plants can also provide the raw material of wax, the contribution of lakes to lower aquatic organisms may be more important.