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选取四川盆地内处于生油窗范围内的广元长江沟剖面和已处于高演化阶段的旺苍鹿渡剖面的大隆组烃源岩作为研究对象,进行了烃源岩索氏抽提和干酪根催化加氢热解实验,将两种方法获取的生物标志物特征进行了对比,以探讨催化加氢热解产物同抽提物中生物标志物特征的异同,以及热成熟作用对键合态生物标志物的影响程度.研究结果表明,高-过成熟烃源岩以及存在不同岩性夹层的烃源岩干酪根中的键合态生物标志物都很难同其抽提物中的游离态生物标志物进行直接对比,而采用干酪根催化加氢热解技术可以较大程度上帮助消除热成熟作用(在Ro≤2.4%的范围内)的影响以及烃源岩夹层间运移烃的干扰,所提取的键合态生物标志物能够有效地应用于高-过成熟烃源岩的分子地球化学表征及油源对比研究.
The Changjianggou section of Guangyuan, which is located within the oil window, and the Dalong Group source rock that was already in the high-evolution stage of Wangdeluduo Section in Sichuan Basin were selected as research objects. Soxhlet extraction and kerogen catalysis Hydrogenation pyrolysis experiments, the biomarkers obtained by the two methods were compared to explore the similarities and differences between the catalytic hydrogenation pyrolysis products and biomarkers in extracts, as well as thermal maturation of biomarkers of bound state The results show that the bound biomarkers in the kerogen of high-over-mature source rocks and source rocks with different lithologic intercalations are hardly comparable to the free-form biomarkers , And the use of kerogen-catalyzed hydropyrolysis can greatly help to eliminate the influence of thermal maturity (within Ro≤2.4%) and the interference of hydrocarbons transported from the source rock intercalation. The extracted Of the bonded biomarkers can be effectively applied to the molecular geochemical characterization and oil-source correlation of high-over-mature source rocks.