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现代地质 ›› 2019, Vol. 33 ›› Issue (06): 1220-1228.DOI: 10.19657/j.geoscience.1000-8527.2019.06.08

• 石油地质学 • 上一篇    下一篇

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

孙可欣1,2, 李贤庆1,2(), 魏强1,2, 梁万乐1,2, 张亚超1,2, 李剑3, 肖中尧4   

  1. 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
  • 收稿日期:2019-05-10 修回日期:2019-08-20 出版日期:2019-12-26 发布日期:2019-12-27
  • 通讯作者: 李贤庆
  • 作者简介:李贤庆,男,教授,博士生导师,1967年出生,矿产普查与勘探专业,主要从事煤油气地质、有机地球化学、有机岩石学方面的教学与科研。Email:Lixq@cumtb.edu.cn
    孙可欣,女,硕士研究生,1994年出生,矿产普查与勘探专业,主要从事油气地质、油气地球化学研究。
  • 基金资助:
    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)

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

SUN Kexin1,2, LI Xianqing1,2(), WEI Qiang1,2, LIANG Wanle1,2, ZHANG Yachao1,2, LI Jian3, XIAO Zhongyao4   

  1. 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China
    2. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
    3. Branch of Natural Gas Geology, Research Institute of Petroleum Exploration and Development, PetroChina, Langfang,Hebei 065007, China
    4. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
  • Received:2019-05-10 Revised:2019-08-20 Online:2019-12-26 Published:2019-12-27
  • Contact: LI Xianqing

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。

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

Abstract:

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: bright-blue 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% and 12%-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 from 2.2 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.

Key words: Kuqa Depression, Keshen large gas field, fluid inclusion, quantitative grain fluorescence, paleo-fluid characteristics, homogenization temperature, hydrocarbon charging

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