摘要鄂尔多斯盆地西缘中生代延长组油气勘探长期以来为石油地质工作者所重视，西缘构造带与鄂尔多斯含油气盆地发展演化及改造息息相关。鄂尔多斯盆地西缘油气成藏规律研究对指导油气勘探工作具有重要的实际意义。本文应用流体包裹体分析技术和研究方法，通过系统测试分析鄂尔多斯盆地西缘马家滩地区中生代延长组油气包裹体的物理、化学参数，确定油气成藏期次、成藏时间及保存条件等，综合地质构造演化，探讨了油气运移成藏特征。研究表明，本区存在两期油气包裹体，分布在不同期次的构造裂隙中。两期各具特点的油气包裹体，分别代表了两次油气成藏事件。根据包裹体与成岩矿物时间序列，确定的油气形成和充注进入储层事件发生在晚白垩世和早第三纪末期。关键词：鄂尔多斯盆地西缘，三叠系，油气包裹体，油气成藏AbstractMesozoicoilandgasexplorationofYanchangformationinWesternOrdosBasinalwaysattractedpeople’sinterest．TectonicsofWesternbelthascloselyrelationshipwiththeevolutionandreconstructionofOrdosBasin．ItisverysignificantforoilandgasexplorationtoresearchondisciplineofoilandgasaccumulationinWesternOrdosBasin．Physicalandchemicalparametersofoil-gasinclusionofMesozoicYanchangformationinmajiatanareawereanalyzed．Fluidinclusionsanalysistechnologyandresearchmethodwereusedtostudyphase，timeandconditionsofoil-gasaccumulation．Featuresofoil-gasmigrationandaccumulationtogetherwithtectonicevolutionwerediscussed．Itindicatesthattherearetwokindsofoil-gasinclusiondistributesintectoniccracksformedatdifferenttectonicstageinthearea．Thetwophasesofoilandgasinclusionswithdifferentcharacteristicsrepresenttwohydrocarbonaccumulationevents.Accordingtotimesequenceofinclusionsanddigeneticmineralgeneration，itproposedthatoil-gasgeneratedandmigratedtoformreservoirduringthetimeofearlyCretaceousandlaterofearlyTertiary．Keywords：WesternOrdosBasin，Triassic，oilandgasinclusion，oilandgasaccumulation目录...................................................................................................................................................4...............................................................................................................................................4...............................................................................................................................................5.....................................................................................................................................7...................................................................................................................................................7...................................................................................................................................................8...................................................................................................................................................8..........................................................................................................................................10........................................................................................................................13.........................................................................................................................................................13...........................................................................................................................................................
