Significant breakthroughs and discovery of shale oil have been made recently in the Upper Cretaceous Qingshankou Formation in the Songliao Basin, providing a new resource target for shale oil exploration of Northeast China. Understanding the tectonic-thermal evolution and maturation histories of Qingshankou Formation are significant aspects of shale oil exploration and evaluation. This study reconstructed the thermal history of Qingshankou Formation since the Late Cretaceous, the results show there are two phases of thermal evolution in the south part of Songliao Basin: (1) The gradual heating stage during the Late Cretaceous, the heat flow is gradually increasing during this period and reach the maximum heat flow value in the end of the Cretaceous; (2) The decline stage since Neogene, the tectonic activity is relatively stable and the geothermal heat flow is gradually reduced during this period, and the present-day heat flows range from 60.1 mW/m2 to 100.7 mW/m2, with an average of 78.2 mW/m2. In addition, the maturity histories of the organic-rich shale were reconstructed based on the new thermal histories. The Cretaceous Qingshankou shales underwent deep burial thermal metamorphism in the end of the late Cretaceous and uplift thermal fading since Neogene. Based on the maturity model, the hydrocarbon generation and expulsion since the Late Cretaceous period of K2qn1 were modeled. Overall, tectonic movement, which controls basin evolution, determines the intensity and timing of hydrocarbon generation and expulsion in the study area.

中文翻译：

---

松辽盆地南部长岭凹陷白垩系青山口页岩构造热演化模拟

近期松辽盆地上白垩统青山口组页岩油取得重大突破和发现，为东北地区页岩油勘探提供了新的资源目标。了解青山口组的构造-热演化和成熟历史是页岩油勘探和评价的重要方面。本研究重建了晚白垩世以来青山口组的热历史，结果表明松辽盆地南部存在两个热演化阶段：(1)晚白垩世逐渐升温阶段，热流逐渐增加并在白垩纪末期达到最大热流值；(2) 新近纪以来的衰退阶段，这一时期构造活动相对稳定，地热热流逐渐减少，现今热流从60.1 mW/m2到100.7 mW/m2，平均为78.2 mW/m2。此外，根据新的热史重建了富有机质页岩的成熟史。白垩纪青山口页岩在晚白垩世末期经历深埋藏热变质作用，新近纪以来隆起热衰变。以成熟度模型为基础，模拟了K2qn1晚白垩世以来的生排烃过程。总体而言，控制盆地演化的构造运动决定了研究区油气生排的强度和时间。1 mW/m2 至 100.7 mW/m2，平均为 78.2 mW/m2。此外，根据新的热史重建了富有机质页岩的成熟史。白垩纪青山口页岩在晚白垩世末期经历深埋藏热变质作用，新近纪以来隆起热衰变。以成熟度模型为基础，模拟了K2qn1晚白垩世以来的生排烃过程。总体而言，控制盆地演化的构造运动决定了研究区油气生排的强度和时间。1 mW/m2 至 100.7 mW/m2，平均为 78.2 mW/m2。此外，根据新的热史重建了富有机质页岩的成熟史。白垩纪青山口页岩在晚白垩世末期经历深埋藏热变质作用，新近纪以来隆起热衰变。以成熟度模型为基础，模拟了K2qn1晚白垩世以来的生排烃过程。总体而言，控制盆地演化的构造运动决定了研究区油气生排的强度和时间。白垩纪青山口页岩在晚白垩世末期经历深埋藏热变质作用，新近纪以来隆起热衰变。以成熟度模型为基础，模拟了K2qn1晚白垩世以来的生排烃过程。总体而言，控制盆地演化的构造运动决定了研究区油气生排的强度和时间。白垩纪青山口页岩在晚白垩世末期经历深埋藏热变质作用，新近纪以来隆起热衰变。以成熟度模型为基础，模拟了K2qn1晚白垩世以来的生排烃过程。总体而言，控制盆地演化的构造运动决定了研究区油气生排的强度和时间。