岩性油气藏 ›› 2023, Vol. 35 ›› Issue (1): 132–144.doi: 10.12108/yxyqc.20230112

• 地质勘探 • 上一篇    

柴达木盆地英西地区渐新统下干柴沟组上段储层微观孔隙结构特征

夏青松1, 陆江2, 杨鹏1, 张昆1, 杨朝屹1, 聂俊杰1, 朱云舫1, 李立芳1   

  1. 1. 西南石油大学 地球科学与技术学院, 成都 610500;
    2. 南方海洋科学与工程广东省实验室, 广东 湛江 524000
  • 收稿日期:2022-08-29 修回日期:2022-09-09 发布日期:2023-01-06
  • 通讯作者: 陆江(1979-),男,硕士,高级工程师,主要从事石油与天然气地质方面的研究工作。Email:lujiang@zjblab.com。 E-mail:lujiang@zjblab.com
  • 作者简介:夏青松(1978-),男,博士,副教授,主要从事石油地质方面的科研与教学工作。地址:(610500)成都市新都大道8号西南石油大学地球科学与技术学院。Email:3036871@qq.com
  • 基金资助:
    国家科技重大专项“岩性油气藏气成藏主控因素与富集机理”(编号: 2017ZX06001)资助

Microscopic pore structure characteristics of the upper member of Oligocene Xiaganchaigou Formation in Yingxi area, Qaidam Basin

XIA Qingsong1, LU Jiang2, YANG Peng1, ZHANG Kun1, YANG Chaoyi1, NIE Junjie1, ZHU Yunfang1, LI Lifang1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang 524000, Guangdong, China
  • Received:2022-08-29 Revised:2022-09-09 Published:2023-01-06

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摘要： 柴达木盆地英西地区渐新统下干柴沟组上段为“自生自储”型油气藏。利用X射线衍射全岩矿物含量分析、薄片鉴定、扫描电镜观察、二氧化碳吸附、氮气吸附/脱附、高压压汞、核磁共振、自发渗吸等实验手段，系统分析柴达木盆地英西地区渐新统下干柴沟组上段储层特征，精细表征了其微观孔隙结构特征。研究结果表明:①英西地区渐新统下干柴沟组上段储层为细粒沉积岩，其矿物成分主要为白云石和铁白云石等碳酸盐，含有长石、石英等陆源碎屑，伊蒙混层和伊利石等黏土矿物。②研究区储集岩整体较为致密，孔隙度为1.0%～14.5%，平均为4.0%，渗透率为0.011～6.146mD，平均为0.125mD，具有低孔特低渗特征。③研究区储集岩的孔隙类型以晶间孔、溶蚀孔、溶洞和裂缝为主，储层孔隙形态为平行狭缝型。④研究区微孔的质量体积平均为0.0056mL/g，占总孔的质量体积的34.70%；中孔的质量体积平均为0.0066mL/g，占总孔体积的40.84%，宏孔的质量体积相对较小，为0.0039mL/g，占总孔体积的24.46%，因此，对岩石储集性贡献最大的为中孔，其次是微孔。

关键词: 晶间孔, 低孔特低渗, 平行狭缝型孔隙形态, 吸附/脱附实验, 核磁共振, 下干柴沟组上段, 渐新统, 英西地区, 柴达木盆地

Abstract: The upper member of Oligocene Xiaganchaigou Formation (E32) in Yingxi area of Qaidam Basin is a self-generation and self-storage type oil and gas reservoir. By using a series of experimental means such as X-ray diffraction analysis of whole rock mineral content，thin section identification，scanning electron microscope observation，carbon dioxide adsorption，nitrogen adsorption/desorption，high pressure mercury injection，nuclear magnetic resonance and spontaneous absorption，the reservoir characteristics of E32 in Yingxi area were systematically analyzed and the microscopic pore structure characteristics were finely characterized. The results show that: (1) The reservoirs of E32 in Yingxi area are dominated by fine-grained sedimentary rocks. Its mineral composition is mainly carbonate such as dolomite and ankerite，containing terrigenous clasts such as feldspar and quartz，and clay minerals such as illite-montmorillonite mixed-layer and illite. (2) The reservoir rocks in the study area are relatively dense as a whole. The porosity is 1.0%-14.5%，with an average of 4.0%，while the permeability is 0.011-6.146 mD， with an average of 0.125 mD，which is characterized by low porosity and ultra-low permeability. (3) The pore types of the reservoir rocks in the study area are mainly intercrystalline pores，dissolved pores，caves and fractures， and the pores are parallel slit-shaped. (4) The average pore volume of micropores in the study area is 0.005 6 mL/g， accounting for 34.70% of the total pore volume. The average pore volume of mesopores is 0.006 6 mL/g，accounting for 40.84% of the total pore volume. The pore volume of macropores is 0.0039 mL/g，relatively small，accounting for 24.46% of the total pore volume. Therefore，mesopores contribute the most to rock reservoirs，followed by micropore.

Key words: intercrystalline pore, low porosity and extra-low permeability, parallel slit-shaped pore, adsorption/ desorption experiments, nuclear magnetic resonance, upper member of Xiaganchaigou Formation, Oligocene, Yingxi area, Qaidam Basin

中图分类号: 

  • TE122.2
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