从有机包体特征探讨油气运移时间——以东海盆地西湖坳陷花港组储层为例  

TIMING OF HYDROCARBON MIGRATION AND ORGANIC INCLUSIONS VERIFICATION FROM HUAGANG RESERVOIR OF XIHU DEPRESSION,DONGHAI BASIN

作　　者：叶素娟[1] 姜亮 

机构地区：[1]成都理工学院石油系,四川成都610059 [2]中国海洋石油公司东海分公司,上海200030

出　　处：《矿物岩石》2001年第2期38-41,共4页Mineralogy and Petrology

摘　　要：通过对西湖坳陷花港组砂岩成岩作用过程中捕获的有机包裹体研究 ,表明不同成岩阶段形成的自生矿物中有机包裹体的类型、产状和组分特征各不相同。本研究采用激光拉曼光谱技术测定包裹体有机组分以及α石英 ESR测年技术 ,通过包裹体有机组分的成熟度特征 ,结合区域埋藏史和烃源岩有机质成熟史 ,确定了砂岩成岩史与有机质成熟史 ,并探讨了油气运移时间的关系。本区存在两期油气运移 :一期与砂岩晚成岩 A阶段的石英加大发育期一致 ,年龄约为 2 4Ma以后。另一期则与 N1 末期的龙井运动引起的挤压所造成的裂隙有关。The different phase behavior, occurrence and composition of organic inclusions were recognized in different authigenic minerals which precipitated during diagenesis of reservoir sandstone in Huagang Formation , Xihu depression of Donghai Basin.Three phase behavior types of organic inclusions indicated three stages of hydrocarbon maturity. The inclusions of water with hydrocarbon occurs in microgranular quartz pore liners; Pure liquid hydrocarban was found in quartz overgrowths and liquid hydrocarbon with gas hydrocarbon in fracture cutting through quartz and quartz overgrowth.Based on the study of maturity characteristics indicated by the organic composition of inclusions and the age of authigenic quartz, determined by technique ofα quartz ESR, in combination with regional geological data , the timing of oil and gas migration is computed . Early migration occurred concurently with quartz overgrowth after about 26Ma. The organic inclusions found in fractures are considered as the indicator of later period of oil and gas migration, which was in Longjing Movement, the end of early Neogene.

关 键 词：有机包裹体 相态特征 ESR测年技术 成熟度 油气演化程度 赋存状态 

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