柴达木盆地西部英东地区油气成藏过程  

Hydrocarbon Charge History of Yingdong Oilfield,Western Qaidam Basin

作　　者：桂丽黎[1,2] 刘可禹[1,2,3] 柳少波[1,2] 孙维凤[1,2] 孟庆洋[1,2] 袁莉[4] 吴凡[5] 郝加庆[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气集团公司盆地构造与油气成藏重点实验室,北京100083 [3]CSIRO Earth Science and Resource Engineering, Bentley 6102, Australia [4]中国石油青海油田公司勘探开发研究院,甘肃敦煌736202 [5]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《地球科学（中国地质大学学报）》2015年第5期890-899,共10页Earth Science-Journal of China University of Geosciences

基　　金：国家油气重大专项项目(No.2011ZX05003);中国石油天然气股份有限公司科学研究与技术开发项目(Nos.2011B-04,2011A-0207)

摘　　要：柴达木盆地西部英东地区多期构造运动导致油气分布复杂,勘探难度大.采用油气地球化学、流体包裹体、定量荧光以及傅里叶红外光谱等方法系统分析英东地区油气成藏演化过程.研究表明:(1)英东地区新近系储层发育黄色和蓝色荧光两类油包裹体和天然气包裹体,黄色荧光和蓝色荧光油气包裹体对应两期油气充注时间分别为12Ma和5Ma.(2)现今油藏原油具有同源-低熟的特点,黄色荧光油包裹体成熟度较低与现今油藏原油特征相似,是现今油藏的主要贡献者.(3)蓝色荧光油包裹体的成熟度较高,蓝色荧光油包裹体和气烃包裹体是早期低熟原油沿后期构造产生的断层疏导体系向上调整运移至浅层分馏和脱气的产物.通过以上分析明确了英东油藏经历了下油砂组(N12)沉积末期(12Ma)的低熟原油充注和上油砂组(N22)沉积末期(5Ma)至今油气调整与改造的成藏过程,与喜山期主要构造活动期有很好的对应关系,反映构造活动对油气成藏具有重要控制作用.The Yingdong oilfield,western Qaidam basin,is an important petroleum exploration front in the basin.However,the distribution of oil-gas-water is complex due to the complex structures and the pervasive faulting in the reservoirs and the petroleum accumulation process is still to be probed in detail.The petroleum accumulation process in the area was investigated by using an integrated grain fluorescence,fluid inclusion and organic geochemical analyses in this study.The results show follows：（1）There were two episodes of oil charge in N12-N22,as reflected by three types of hydrocarbon inclusions,occurred in around 12 Ma and 5Ma,respectively.（2）The current oil accumulations in the oilfield derived from upward migration of palaeooil reservoirs in the depth are from the same sources.（3）The QGF index which is larger than 2and the development of yellow fluorescent hydrocarbon inclusions with low mature crude oil indicate that there existed crude oil with low maturity recharge in the early stage.Such crude oil came from the same low mature oil source and there is no high mature oil in the source.The decreasing of light component with increasing buried depth indicates that the blue fluorescent hydrocarbon inclusions and gas hy-drocarbon inclusions resulted from the late tectonic activity and the fault adjusted upward migration degassing channel system.The Yingdong oilfield has great exploration potential because of the inheritance structural development and the occurrence of two episodes of hydrocarbon accumulations.

关 键 词：英东油田 油藏演化 定量颗粒荧光技术 流体包裹体 红外光谱 石油地质 柴达木盆地. 

分 类 号：P618.13[天文地球—矿床学]