库车坳陷克深大气田白垩系致密砂岩储层古流体地球化学特征研究  

Geochemical Characteristics of Paleo-fluid in Tight Sandstone from Cretaceous Reservoir in Keshen Large Gas Field,Kuqa Depression

作　　者：孙可欣[1,2] 李贤庆[1,2] 魏强 梁万乐[1,2] 张亚超 李剑 肖中尧[4] SUN Kexin;LI Xianqing;WEI Qiang;LIANG Wanle;ZHANG Yachao;LI Jian;XIAO Zhongyao(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing 100083;College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Branch of Natural Gas Geology,Research Institute of Petroleum Exploration and Development,PetroChina,Langfang,Hebei 065007;Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,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 [4]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《现代地质》2019年第6期1220-1228,1274,共10页Geoscience

基　　金：国家科技重大专项(2016ZX05007-003);国家自然科学基金项目(41572125);中央高校基本科研业务费专项资金项目(2010YM01)

摘　　要：采用包裹体岩相学、均一温度、盐度、含油包裹体丰度、储层颗粒荧光定量实验分析方法,对库车坳陷克深大气田白垩系巴什基奇克组储层致密砂岩样品进行测试,剖析克深大气田深层致密砂岩储层古流体地球化学特征与油气充注。结果表明,克深大气田发育两期油气包裹体,分别为发亮蓝色荧光的轻质油包裹体与灰黑色的气态烃包裹体。克深大气田包裹体均一温度分布存在130~140℃与150~160℃两个主峰值,相应的古盐度值为16%~10%与12%~4%,表明有两期烃类流体充注,其中天然气高强度充注发生在2. 5 Ma以来。含油包裹体丰度分布在2. 1%~13. 4%之间,QGF指数为2. 2~9. 6,QGF-E强度为20~38 pc,揭示克深大气田形成过程中曾经存在强度较弱的轻质油充注。To study the geochemical characteristics of paleo-fluids and hydrocarbon charging in tight sandstone reserviors of the Keshen large gas field,we analyzed the fluid inclusion petrography,homogenization temperature,salinity,oil inclusion abundance via quantitative fluorescence technique on the Bashenjiqike Formation sandstone in the gas field. The study shows that there were two generations of hydrocarbon inclusions: brightblue fluorescence oil inclusions and gray-black gas ones. Homogenization temperatures of coeval aqueous inclusions show two peaks at 130-140 ℃ and 150-160 ℃,with corresponding paleo-salinity of 16%-10% and12%-4%. This indicates two stages of hydrocarbon fluid filling,in which the high-intensity natural gas was charging since 2. 5 Ma. The abundance of oil inclusions ranges from 2. 1% to 13. 4%,QGF index ranges from2. 2 to 9. 6,QGF-E intensity are from 20 pc to 38 pc. These results reveal a weak light-oil filling in the formation of the Keshen large gas field.

关 键 词：库车坳陷 克深大气田 流体包裹体 颗粒荧光定量 古流体特征 均一温度 油气充注 

分 类 号：TE133[石油与天然气工程—油气勘探]