利用流体历史分析技术研究库车坳陷大北气田油气充注史  

Restore the hydrocarbon charge history by using fluid history analysis techniques in Dabei Gas Field,Kuqa Depression,Tarim Basin

作　　者：孙可欣[1,2] 李贤庆[1,2] 魏强 梁万乐[1,2] 李剑 张光武[3] Sun Ke-xin;Li Xian-qing;Wei Qiang;Liang Wan-le;Li Jian;Zhang Guang-wu(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology（Beijing）,Beijing 100083,China;College of Geoscience and Surveying Engineering,China University andTechnology（Beijing）,Beijing 100083,China;Institute of Natural Gas Geology,Research Instituteof Petroleum Exploration and Development,PetroChina,Langfang 065007,China)

机构地区：[1]中国矿业大学(北京)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(北京)地球科学与测绘工程学院,北京100083 [3]中国石油勘探开发研究院天然气地质研究所,河北廊坊065007

出　　处：《天然气地球科学》2018年第9期1289-1300,共12页Natural Gas Geoscience

基　　金：国家油气科技重大专项课题(编号:2016ZX05007-003);中央高校基本科研业务费专项资金项目(编号:2010YM01)联合资助

摘　　要：运用流体包裹体岩相学、均一温度、含油包裹体丰度及储层颗粒荧光定量等多种流体历史分析方法,对塔里木盆地库车坳陷大北气田储层古流体特征、油气充注期次和时间进行了研究,并结合构造演化及沉积埋藏史恢复了大北气田油气充注史。研究表明,库车坳陷大北气田发育2期油气充注:第一期为6～4Ma的凝析油充注,该期充注被蓝白色荧光液态烃包裹体记录下来,QGF波长峰值也显示凝析油的特征,QGF指数分布在1.7～24之间,表明凝析油在大北古构造内形成有效充注,聚集形成古油层,库车中期凝析油沿穿盐断裂大量散失;第二期为3Ma至今的天然气充注,灰黑色的气态烃包裹体记录了该期充注,QGF-E谱图显示烃类流体整体偏轻,轻质的烃类流体充注与晚期的油气快速充注是该地区含油包裹体丰度偏低的原因。库车组沉积晚期以来天然气持续充注、优良储盖组合与构造演化的时空配置使该时期成为大北气田的主要成藏期,具有晚期成藏的特点。Based on the petrography and homogenization temperature of fluid inclusion,analyses of grains with oil inclusions（GOI）,quantitative grain fluorescence（QGF）and quantitative grain fluorescence on extract（QGF-E）,characteristics and abundance of paleo fluid are comprehensively studied.We also analyzed the periods and times of hydrocarbon charging,and restore the history of hydrocarbon charging in Dabei Gas Field of Tarim Basin.The study shows that the reservoir of Dabei Gas Field experienced two stages of hydrocarbon charging：The first stage is condensate oil charging（6-4 Ma）,which was recorded by the bluewhite fluorescence hydrocarbon inclusions.QGF spectrogram shows the characteristics of condensate and the range of QGF index is 1.7-24.It believed that the condensate formed paleo-oil layer and then was lost through crossing salt layers faults in the middle of Pliocence Kuche Formation.The second period is natural gas charging（3-0 Ma）,the black gas inclusions in samples recorded that.The QGF-E spectrum indicates that hydrocarbon fluid was light,light components and late hydrocarbon charging leading to low GOI values.The good matching relationship among natural gas generation,reservoir-capping assemblage and tectonic evolution makes the late of Pliocence Kuche Formation up to now a main pool-forming period of Dabei Gas Field and it has the characteristics of late accumulation.

关 键 词：大北气田 流体包裹体 均一温度 含油包裹体丰度 颗粒荧光定量分析 油气充注史 

分 类 号：TE122.3[石油与天然气工程—油气勘探]