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地质事件(Geological events)是地球上短期内突发的非生物变化或事变,岩浆活动可导致地史中的热事件。本文首次采用多项有机地球化学的分析测试技术,通过对下扬子盆地黄桥地区一口石油探井的系统研究,借助于烃源岩的光学(镜质组反射率R_0、孢粉颜色指数SCI)、热学(热解峰温t_(max))和化学(氢指数IH、降解潜率D以及H/C和O/C原子比)等特征的异常变化,确认发生在早二叠世末期的东吴运动热事件的存在,岩浆浅成-超浅成侵入或喷发活动是热事件的内因。文中初步探讨了该期热事件的地质意义,在另文中还将进一步剖析这类热事件对黄桥地区凝析油气成因的影响。
Geological events are sudden, abiotic changes or events on Earth that can lead to thermal events in Earth’s history. This paper, for the first time, adopts a number of organic geochemical analysis and testing techniques. Based on the systematic study of an oil exploration well in Huangqiao area of the Lower Yangtze Basin, with the help of the optical (vitrinite reflectance R_0, Sporopollen color index SCI) Thermal (pyrolysis peak temperature t max) and chemical (hydrogen index IH, the degradation potential D and H / C and O / C atomic ratio) and other characteristics of the abnormal changes in the late Early Permian to confirm the Soochow The existence of thermal events, magmatic shallow to super-shallow invasion or eruption activity is the internal cause of thermal events. In this paper, the geological significance of this thermal event is discussed preliminarily. In another text, the influence of such thermal events on the origin of condensate hydrocarbons in Huangqiao area will be further analyzed.