塔里木盆地轮古东地区奥陶系储层流体包裹体研究及油气成藏史  

Characteristics of Hydrocarbon Inclusions and Geological Age of Hydrocarbon Accumulation in Ordovician Reservoir of Eastern Lungu Area,Tarim Basin

作　　者：房启飞[1] 张鼐[2] 张宝收[3] 卢玉红[3] 武雪琼 余小庆[2] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油勘探开发研究院,北京100083 [3]中国石油塔里木油田勘探开发研究院,新疆库尔勒841000 [4]中国石油大学,北京102249

出　　处：《天然气地球科学》2014年第10期1558-1567,共10页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司塔里木油田分公司科研项目(编号:041010120148)资助

摘　　要：流体包裹体蕴含的信息可以反演油气成藏期次。对轮古东地区奥陶系储层烃包裹体荧光特征、赋存关系研究,结合烃共生盐水包裹体显微测温分析,确定该储层发育3期烃包裹体:第Ⅰ期为晚加里东—早海西期形成的发褐色荧光烃包裹体;第Ⅱ期为晚海西期形成的发黄色荧光烃包裹体;第Ⅲ期为燕山—喜马拉雅期形成的发蓝白色荧光烃包裹体。对定量颗粒荧光QGF光谱和颗粒吸附烃全扫描荧光TSF定量荧光光谱对比分析,发现包裹烃与吸附烃反映的油气性质具有良好的一致性;基于烃共生盐水包裹体PT模拟结果,将烃共生盐水包裹体捕获温度与捕获深度组合投点于地热—埋藏史图上,确定轮古东地区奥陶系储层主要经历3期油气充注,分别为晚加里东—早海西期、晚海西期和喜马拉雅早期。晚加里东—早海西期和晚海西期2期油气藏遭受不同程度的破坏或降解作用,3期油气分别以重质油—稠油、中质油和轻质—凝析油为特征。The information contained in fluid inclusions can demonstrate the hydrocarbon accumulation period.Based on the fluorescence characters and the occurrence relationships of hydrocarbon inclusions in the Ordovician reservoir of eastern Lungu area,and combined with micro-thermometry analysis of coexisting aqueous inclusions,hydrocarbon inclusions of Ordovician reservoir can be divided into three stages.The brown fluorescence hydrocarbon inclusions representing the first stage were formed in the Late Caledonianearly Hercynian Period.The yellow fluorescence hydrocarbon inclusions of second stage were formed in the Late Hercynian Period.And the blue-white fluorescence hydrocarbon inclusions representing the last stage were formed in the period of Yanshan-Himalayan.Quantitative Grain Fluorescence（QGF）fingerprints were analyzed compared with Total Scanning Fluorescence（TSF）fingerprints of adsorbed hydrocarbons and non-hydrocarbons.The consistency of the inclusion oil and absorbed oil in the Ordovician reservoir is satisfactory.Based on PT simulation results of coexisting aqueous inclusions,combination of trapped-temperature and trapped-depth of fluid inclusion on the diagram of geothermal-burial history can be used to make sure about the history of hydrocarbon accumulation in Ordovician reservoir.Ordovician reservoirs of eastern Lungu area were charged three times.The first stage of heavy oil-filling was in the period of Late Caledonian-Early Hercynian;and the second stage happened in the period of Late Hercynian with normal oil filling;and the third stage of light oil or condensate oil-gas filled in the period of Early Himalayan.The Ordovician oil-gas reservoirs in eastern Lungu area were charged by the first and second stages of oil and gas which had been destroyed and degraded to different degrees before the oil-gas filled in the third stage.

关 键 词：油气成藏期次 流体包裹体 荧光分析 奥陶系 轮古东地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]