柴达木盆地北缘地区油气储层中流体包裹体特征及成藏期研究  

Fluid inclusion characteristics of oil and gas reservoirs in the northern Qaidam Basin and implications for petroleum accumulation

作　　者：仰云峰[1,2] 李贤庆[1,2] 董鹏[1,2] 彭德华 陈琰 韩秦鹏 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学地球科学与测绘工程学院,北京100083 [3]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《地球化学》2009年第6期591-599,共9页Geochimica

基　　金：教育部新世纪优秀人才支持计划(NCET-06-0204);国家自然科学基金(40572085);有机地球化学国家重点实验室开放基金(OGL-200403);中国石油青海油田分公司科研项目(QHKT/JL-03-013)

摘　　要：根据流体包裹体的透射光和荧光镜下观察、包裹体均一温度及含油包裹体丰度(GOI)分析,对柴达木盆地北缘(柴北缘)地区南八仙、马北1号构造古近系、新近系油气储层样品中流体包裹体特征及油气成藏期进行了研究。柴北缘地区流体包裹体较为发育,存在盐水溶液包裹体和有机包裹体,主要分布在石英裂隙、次生加大边及胶结物中,但个体一般较小,主要为5～10μm。含油包裹体丰度GOI值较低,绝大多数样品GOI值分布在2.0%～10.5%之间,约40%样品的GOI值超过5%。包裹体均一温度在不同油气储层样品中差异较大,说明这些包裹体可能是在不同时期形成的。依据包裹体均一温度的实测结果,结合沉积埋藏-热演化史的资料,认为柴北缘地区南八仙构造和马北1号构造均经历了两期油气充注成藏,前者油气充注时间为N1—N21沉积期、N22—N23沉积期,后者油气充注时间为N1沉积期、N1末—N2沉积期。Based on the fluid inclusion study （microscopy characteristics, homogenization temperatures and grains with oil inclusions）, the pool-forming times of Nanbaxian and Mabei 1 oilfields, north Qaidam Basin, have been discussed in this paper. Fluid inclusions in northern Qaidam Basin are relatively abundant, including saline aqueous inclusion and organic inclusion. These inclusions are small （5- 10 μm）, mainly distribute in quartz fractures, overgrowths and cementations. The abundances of grains with oil inclusions （GOI） are commonly low, mostly ranging between 2. 0% - 10. 5% with about 40 percent samples over 5%. The homogenization temperatures of fluid inclusions in different samples are markedly variable, which indicates that these inclusions formed in different periods. According to the measured homogenization temperatures of fluid inclusions and combined with N2^2 - N2^3 burial evolution history, Nanbaxian and Mabei 1 oilfields experienced two pool-forming times, N1 - N2^1 and N2^2-N2^3 and N1 and N1 end- N2, respectively.

关 键 词：油气储层 流体包裹体 均一温度 含油包裹体丰度 成藏期次 

分 类 号：P593[天文地球—地球化学] P618.13[天文地球—地质学]