岩性油气藏 ›› 2022, Vol. 34 ›› Issue (3): 49–59.doi: 10.12108/yxyqc.20220305

• 地质勘探 • 上一篇    下一篇

库车坳陷克深井区白垩系巴什基奇克组孔缝充填特征及流体来源

汪林波1,2, 韩登林1,2, 王晨晨2,3, 袁瑞4, 林伟1,2, 张娟1,2   

  1. 1. 长江大学 地球科学学院, 武汉 430100;
    2. 储层微观结构演化及数字表征实验室, 武汉 430100;
    3. 非常规油气湖北省协同创新中心, 武汉 430100;
    4. 长江大学 信息与数学学院, 湖北 荆州 434023
  • 收稿日期:2021-11-17 修回日期:2021-12-30 出版日期:2022-05-01 发布日期:2022-05-12
  • 通讯作者: 韩登林(1979-),男,博士,教授,主要从事储层成岩作用与储层沉积学方面的教学与科研工作。Email:handl@yangtzeu.edu.cn。
  • 作者简介:汪林波(1997-),女,长江大学在读硕士研究生,研究方向为矿物学、岩石学、矿床学。地址:(430100)湖北省武汉市长江大学路特1号。Email:18845644580@163.com
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”（编号：2017ZX05008-003-050）资助

Characteristics of pore-fracture filling and fluid source of Cretaceous Bashijiqike Formation in Keshen well block，Kuqa Depression

WANG Linbo1,2, HAN Denglin1,2, WANG Chenchen2,3, YUAN Rui4, LIN Wei1,2, ZHANG Juan1,2   

  1. 1. College of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Laboratory of Reservoir Microstructure Evolution and Digital Characterization, Wuhan 430100, China;
    3. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan 430100, China;
    4. School of Information and Mathematics, Yangtze University, Jingzhou 434023, Hubei, China
  • Received:2021-11-17 Revised:2021-12-30 Online:2022-05-01 Published:2022-05-12

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摘要： 塔里木盆地库车坳陷白垩系巴什基奇克组为典型的超深层裂缝-孔隙型砂岩储层。通过岩石薄片观察和阴极发光分析对裂缝内充填的碳酸盐脉体和孔隙内赋存的碳酸盐胶结物进行了分析研究，结合微区原位元素测试等技术手段，对比分析了库车坳陷克深井区白垩系巴什基奇克组孔缝碳酸盐流体性质、期次和来源等。研究结果表明：①库车坳陷克深井区白垩系巴什基奇克组孔隙中赋存2期方解石胶结物和2期白云石胶结物；裂缝中充填2期方解石脉体和1期白云石脉体。②研究区白垩系巴什基奇克组孔隙中赋存的第Ⅱ期方解石胶结物与裂缝中充填的第Ⅰ期方解石脉体阴极发光均呈橙黄色，且具有相似的稀土配分模式（轻稀土富集，重稀土亏损，δCe弱负异常，δEu明显正异常），显示孔隙和裂缝中存在着同期同源流体，且该期流体的胶结倾向于发生在裂缝内，对裂缝周边孔隙的保存具有建设作用。

关键词: 碳酸盐胶结物, 碎屑岩储层, 裂缝, 孔隙, 巴什基奇克组, 白垩系, 克深井区, 库车坳陷

Abstract: The Cretaceous Bashijiqike Formation in Kuqa Depression of Tarim Basin is a typical ultra-deep fracture-pore sandstone reservoir. The properties，stages and sources of pore-fracture carbonate fluid in Cretaceous Bashijiqike Formation in Keshen well block of Kuqa Depression were comparatively analyzed by means of observation of thin sections and cathode-luminescence analysis of carbonate veins and carbonate cements in pores. The results show that：（1）There were two-stage calcite cements and two-stage dolomite cements in the pores of Cretaceous Bashijiqike Formation in Keshen well block，Kuqa Depression. The fractures were filled with two-stage calcite veins and one-stage dolomite veins.（2）The phase Ⅱ calcite cements existed in the pores and the phase Ⅰ calcite veins filled in the fractures of Cretaceous Bashijiqike Formation in the study area are orange-yellow in cathodoluminescence，and they have similar REE distribution patterns（LREE enrichment, HREE loss， weak negative δCe anomaly，positive δEu anomaly），indicating that there are simultaneous homologous fluids in the pores and fractures. The fluid cementation at that stage tends to occur in fractures，which plays a constructive role in the preservation of pores around the fractures.

Key words: carbonate cements, clastic reservoir, fracture, pore, Bashijiqike Formation, Cretaceous, Keshen well block, Kuqa Depression

中图分类号: 

  • TE122.1
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