库车前陆盆地羊塔克地区流体包裹体特征及油气成藏过程  

Fluid Inclusion Characteristics and Hydrocarbon Accumulation Process of Yangtake Area,Kuqa Foreland Basin

作　　者：刘建良[1,2] 姜振学 刘可禹 桂丽黎[1,2] 

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]中国石油大学非常规天然气研究院,北京102249 [4]中国石油大学地球科学与技术学院,山东青岛266580

出　　处：《地球科学（中国地质大学学报）》2016年第7期1188-1197,共10页Earth Science-Journal of China University of Geosciences

基　　金：国家科技重大专项课题项目(No.2016ZX05003-002);中国石油股份有限公司项目(No.2011A-0207)

摘　　要：库车前陆盆地羊塔克地区油气资源丰富,明确油气充注历史和成藏演化过程对下一步油气勘探具有重要意义.利用流体包裹体岩相学观察、显微测温分析、定量颗粒荧光分析,并结合库车前陆盆地烃源岩热演化史以及构造演化史,分析了库车前陆盆地羊塔克地区的油气成藏过程.结果表明,羊塔克地区油气具有＂晚期成藏,后期改造＂的特征.库车坳陷中侏罗统恰克马克组烃源岩在15Ma左右成熟（Ro〉0.5%）,生成的成熟原油最早是在新近纪库车早期,约4.0Ma时期,充注到羊塔克构造带,形成少量黄色荧光油包裹体,但大量充注是在约3.5Ma时期.库车坳陷中下侏罗统煤系源岩是在约26Ma时达到成熟,生成的天然气在约3.5Ma,开始大规模的向羊塔克构造带充注.天然气充注后对早期少量原油进行气洗,形成发蓝色荧光的、气液比不一的油气包裹体.油气充注后,在羊塔1地区形成残余油气藏,油水界面位于5 390.75m处.新近纪库车晚期（3.0~1.8Ma）,受喜山晚期构造运动影响,羊塔克地区油气藏发生调整改造,羊塔1地区白垩系的残余油气水界面向上迁移至现今的5 379.70m处.There are abundant oil and gas resources in the Yangtake area,Kuqa foreland basin,and it is significant for oil and gas exploration to study the hydrocarbon charge history and accumulation process in this area.Hydrocarbon accumulation process of the Yangtake area in the Kuqa foreland basin was investigated using an integrated fluid inclusion petrography,microthermometry,quantitative grain fluorescence analysis in combination with source rock thermal evolution and tectonic evolution in the Kuqa foreland basin in this study.The results indicate that hydrocarbon accumulated in the Yangtake area at the Late Neocene and experienced adjustment after the initial accumulation.The Middle Jurassic Qiakemake source rock in the Kuqa depression reached maturity（Ro0.5%）at about 15 Ma,and initially charged into the Yangtake area at Late Neogene Kuqaperiod（around 4.0Ma）.Low abundance oil inclusions with yellow fluorescence were formed at that time.Oil was mainly charged into the study area at around 3.5Ma.The Middle to Lower Jurassic coaly source rock reached maturity at about 26 Ma,while large amount of natural gas was charged into the Yangtake tectonic belt until at about 3.5Ma.Natural gas washed early chargedoil,and formed near blue fluorescence oil inclusions with various gas-liquid ratios.During the mutual interacting between oil and gas,the oil-water contact was once at 5 390.75 min the Yangta-1area.With the strengthening of the Himalayan orogeny,the Yangta-1condensate gas reservoir was adjusted and the gas-water contact was shifted to its current depth of 5 379.70 min the late deposition of the Kuqa Member.

关 键 词：库车前陆盆地 羊塔克地区 流体包裹体 定量荧光 成藏过程 油气地质 

分 类 号：P618.13[天文地球—矿床学]