博格达山构造演化控制下的烃源岩生烃演化模式

为解决准噶尔盆地东南部博格达山构造演化过程及其控制下的有效烃源岩的分布问题,应用平衡剖面恢复技术恢复演化过程；利用生烃模拟技术分析烃源岩演化过程。结果表明：博格达山经历了多期隆升-沉降的演化过程,主要经历了以下4个构造演化阶段：早中二叠世博格达地区处于拉张裂陷阶段、晚二叠世—三叠纪为弱挤压挠曲阶段、早中侏罗世为弱伸展演化阶段、侏罗纪末期至今为持续挤压隆升演化阶段。明确了构造对烃源岩生烃的控制作用,建立了博山山前带一次生烃型、持续生烃型和二次生烃型三种生烃演化模式,落实了有效烃源岩分布。

Study on hydrocarbon generation pattern of source rocks controlled by tectonic evolution of Bogda mountain

In order to solve the tectonic evolution process of Bogda mountain in the southeastern margin of the Junggar basin and distribution of effective source rocks under its control, the balanced cross-section technique is used to restore the evolution process, and the hydrocarbon generation simulation technology is used to analyze the evolution process of the source rock. The results show that the Bogda mountain has undergone multistage uplift and subsidence evolution process, it mainly experienced 4 tectonic evolution stages: Early-Middle Permian is in the extensional rifting stage, Late Permian-Triassic is weak compression flexural stage, Early-Middle Jurassic is in the weak extension stage, and Late Jurassic-present is in the continuous extrusion uplift stage. It is clear that tectonic movement controls the hydrocarbon generation of source rocks, and three hydrocarbon generation models in the Bogda piedmont zone have been established, including first hydrocarbon generation pattern, continuous hydrocarbon generation pattern and secondary hydrocarbon generation pattern, and the effective source rock distribution has been implemented.