江苏句容-黄桥地区有机包裹体形成期次和捕获温度、压力的PVTsim模拟计算  

Liu DH,Gong S,Liu DY,Zeng QH,Xiao XM,Tian H,Shen JH,Li XQ.2005.Investigation on the phases of organic inclusion from Gourong-Huangqiao region,Jiangsu Province,and its trapped temperature & pressure calculated by PVTsim modeling.

作　　者：刘德汉[1] 宫色[1] 刘东鹰[2] 曾庆辉[1] 肖贤明[1] 田辉[1] 申家贵[1] 李贤庆[2] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州510640 [2]江苏油田地质科学研究院,扬州225009

出　　处：《岩石学报》2005年第5期1435-1448,共14页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(编号:4860129);中国石油化工股份有限公司江苏油田分公司资助项目成果之一

摘　　要：据流体包裹体显微镜观测和石油包裹体群的气体色谱和全烃色谱、色谱-质谱分析结果,句容和黄桥地区三叠系和下二叠系地层中的石油包裹体明显不同,句容地区三叠系灰岩储层中的石油包裹体的个体较大,在透光下为黄色-棕黄色,荧光显微镜下发亮黄色荧光,包裹体中气态烃的 C_1/C_(2-5)比值较低,液态烃中三环萜皖、五环三萜烷和规则甾烷系列的生物标志物化合物含量比较丰富,而句容和黄桥地区下二叠系石油包裹体比较细小,发黄色-黄绿色荧光,包裹体中气态烃的 C_1/C_(2-5)比值较高,液态烃中均难检测到甾萜烷系列的生物标志物。由流体包裹体均一温度等观测资料与捕获温度、捕获压力的 PVTsim的模拟计算结果:句容地区三叠系储层的石油包裹体捕获温度 Tr=107.9℃,捕获压力 Pr=289bar,约相当于白垩纪晚期(90～83Ma)充注成藏。句容地区下二叠深灰色灰岩中分布的油包裹体的捕获温度 Tr=123℃,捕获压力 Pr=305.95bar,反映白垩系晚期还有一期温度比较高的含烃流体充注的现象。黄桥地区在含 CO_2气藏的下二叠系存在有交切关系的,黄色和黄绿色两种荧光性质不同的石油包裹体,前者模拟计算的捕获温度 Tr=97.3℃,捕获压力 Pr=184.75bar,后者模拟计算的捕获温度 Tr=145.5℃,捕获压力 Pr=220.05bar,分别相当于白垩纪晚期(95～90Ma)和白垩纪末期(65～60Ma)有含烃流体运聚现象。但是,由于在白垩纪末-第三纪的抬升作用阶段,油气大量散失,因此在喜山期大量无机 CO_2充注成藏时期,储层中已不含烃类流体。Microseopic observations on fluid inclusions from Gourong-Huangqiao region, Jiangsu Province showed that there are two distinct types of oil inclusions. One is from the Triassie limestone with yellow to brown-yellow under transparent light, bright yellow under a fluorescent microscopy and relatively big in size.Another is from the Lower Permian limestone with yellow to yellowish green under a fluorescent microscopy and relatively small in size. Molecular geochemical analyses of the two groups of oil inclusion demonstrated that oil inelusion group from the Triassic limestone was characterized by low ratio of C1/C2-5 in the gasoline hydrocarbon and enriched in biomarkers as tricyclicterpenoids, pentaeyclictriterpenoids and regular steranoids, while oil inclusion group from the Lower Permian limestone was characterized by high ratio of C1/C2-5 in the gasoline hydrocarbons and was non-detectable for the biomarkers. The homogenization temperature distribution of fluid inclusions from the Triassic and Lower Permian limestones suggested that multi-phases of oil inclusions occurred in the reservoir rocks. The PVTsim modeling showed that the trapped temperature and pressure of oil inclusion from the Triassic. limestones in Gourong region are 107.9℃ and 289bar, respectively, indicating a filling history of the late Cretaceous （90 ～ 83Ma） , while the trapped temperature and pressure of oil inclusion from the Lower Permian limestones in Gourong region are 123℃ and 305.95bar, respectively, revealing another hydrocarbon-filling history with a relatively high temperature in the Date Cretaceous. Two distinct types of oil inclusions with yellow and yellowish green, respectively, was identified from the Lower Permian limestones in Huangqiao region where CO2 gas reservoirs occurred. These two types of oil inclusions were spatially intersected with each other. The PVTsim modeling on the yellow one produced a trapped temperature of 97.3℃ and a trapped pressure of 184.75bar, while the yellowish green one with a trapped tem

关 键 词：流体包裹体 显微荧光 均一温度 PVTsim 捕获温度 捕获压力 生物标志物 

分 类 号：P618.130.1[天文地球—矿床学]