苏北黄桥地区东吴运动热事件的有机地球化学证据  

Organic Geochemical Evidence for the Thermal Event of the Dongwu Movement in Huangqiao, Northern Jiangsu

作　　者：王铁冠[1] 包建平[2] 周玉琦 王金渝 费富安[4] 

机构地区：[1]石油大学地球科学系,北京102200 [2]江汉石油学院,荆州434102 [3]中国新星石油公司,北京100083 [4]地质矿产部华东石油地质局,南京210031

出　　处：《地质学报》1998年第4期358-366,共9页Acta Geologica Sinica

摘　　要：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 abiotic short-time sudden changes or happenings on the Earth. Mag-matism may result in thermal events in the geological periods. Organic geochemical analysis was adopted for the study. A petroleum exploratory borehole in the Huangqiao area in the Lower Yangtze basin was systematically investigated. By means of the abnormal changes of the optical (vitrinite reflectance R0 and spore colour index SCI) , thermal (maximum temperature of pyroly-sis tmax)and chemical (hydrogen index IH, degradation potential ratio D and H/C and O/C atomic ratios)parameters, the thermal event of the Dongwu movement at the end of the Early Permian was recongized, and hypabyssal to near-surface magmatic intrusion or eruption was the internal cause for the thermal event.

关 键 词：东吴运动 热事件 有机地球化学 油气成因 

分 类 号：P618.130.1[天文地球—矿床学] P593[天文地球—地质学]