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塔里木盆地中生界生油岩中的五环芳烃化合物的热演化呈规律性变化。成熟度较低的样品中的含量较高，苯并芘和苯并荧蒽的含量较低。随着成熟度的增加，含量逐渐下降，而苯并芘和苯并荧蒽的含量不断增多，这表明两者的成因及其演化途径不同。前者可能为有机质早期演化的产物，而后者主要来自环化和芳构化作用。生油层剖面样品分析资料表明，苯并[e]芘／和（苯并[e]芘＋苯并[a]芘）／之比值是良好的成熟度参数，它们可指示生油岩成油高峰期。
The thermal evolution of pentacyclic aromatic hydrocarbons in the Mesozoic source rocks in the Tarim Basin changed regularly. The content of benzopyrene and benzofluoranthene is high in samples with low maturity. With the increase of maturity, the content decreased gradually, while the content of benzopyrene and benzofluoranthene increased continuously, indicating that the genesis and evolution pathways of the two are different. The former may be the product of the early evolution of organic matter, while the latter mainly comes from the cyclization and aromatization. Analysis of samples from the section of the raw oil reservoir shows that the ratio of benzo [e] pyrene and (benzo [e] pyrene + benzo [a] pyrene) is a good maturity parameter that can indicate the peak period .