【摘要】 通过古地温、古地貌、沉积环境定量恢复及地质事件综合研究，分析青山口组富烃页岩形成环境及成因。结果表明，松辽盆地青山口组富烃页岩R_o介于0.75%～1.60%,游离烃含量高，介于(4～12)mg/g,形成于古地温梯度(50～70)℃/km的高温热盆背景；在拉伸大地动力学及热沉降背景下形成了正断层密集断裂带控制的页岩层系，两凹一凸的古地貌为页岩形成演化提供富集场所；湖相温湿气候及岩浆热液为藻类繁殖成为厚层富烃页岩发育奠定物质基础；缺氧的半深湖—深湖还原—强还原环境有利于有机质埋藏。综合分析表明，构造、湖相沉积与古地温耦合作用奠定了富烃页岩的构造背景和热动力条件，温湿气候、缺氧环境及火山热液带来的营养物质是富烃页岩形成的重要原因。更多还原

【Abstract】 Comprehensive research involving quantitative restoration of paleo-geotherm, paleo-geomorphology, sedimentary environment, and geological events were conducted to study the formation environment and genesis of hydrocarbon-rich shales in the Qingshankou Formation of northern Songliao Basin. The results show that the R_o of the hydrocarbon-rich shales in the Qingshankou Formation of Songliao Basin mainly ranges from 0.75% to 1.60%, with a high content of free hydrocarbons, mainly from 4 to 12 mg/g, formed under a high-temperature thermal basin background with a paleo-geothermal gradient of 50 to 70 ℃/km. Under the background of extensional geodynamics and thermal subsidence, shale layers controlled by densely fractured normal fault zones were formed. The paleo-geomorphology, characterized by two depressions and a protrusion, provided a conducive environment for the formation and evolution of these shales. The warm and humid climate of the lacustrine environment, along with magmatic hydrothermal fluids, laid the material foundation for the proliferation of algae, which was crucial for the development of thick layers of hydrocarbon-rich shales. The semi-deep lacustrine with oxygen deficiency, deep lake reduction, and strong reduction environment were conducive to the burial of organic matter. Comprehensive analysis indicates that the coupling effects of tectonics, lacustrine sedimentation, and paleo-geothermal conditions provided the tectonic background and thermodynamic conditions of hydrocarbon-rich shales. The warm and humid climate, anoxic environment, and nutrients brought by volcanic hydrothermal fluids are important reasons for the formation of hydrocarbon-rich shales.更多还原