石油学报 ›› 2021, Vol. 42 ›› Issue (2): 186-197.DOI: 10.7623/syxb202102004

• 油田开发 • 上一篇    下一篇

油气储层氧敏性概念、机理与意义

游利军, 康毅力, 周洋, 陈强, 程秋洋, 徐洁明, 陈杨   

  1. 西南石油大学油气藏地质及开发工程国家重点实验室 四川成都 610500
  • 收稿日期:2020-02-25 修回日期:2020-12-09 出版日期:2021-02-25 发布日期:2021-02-07
  • 通讯作者: 游利军,男,1976年10月生,2000年获西南石油学院学士学位,2006年获西南石油大学博士学位,现为西南石油大学教授、博士生导师,主要从事储层保护、非常规油气、岩石物理研究与教学工作。
  • 作者简介:游利军,男,1976年10月生,2000年获西南石油学院学士学位,2006年获西南石油大学博士学位,现为西南石油大学教授、博士生导师,主要从事储层保护、非常规油气、岩石物理研究与教学工作。Email:youlj0379@126.com
  • 基金资助:
    国家自然科学基金项目“富有机质页岩氧化致裂增渗加速气体传输机理研究”(No.51674209)、非常规油气层保护四川省青年科技创新研究团队项目“页岩气层氧化协同水力压裂减量增渗方法研究”(2021JDTD0017)和四川省科技创新苗子工程培育项目“富有机质页岩自吸氧化液动力学及扩大作用范围方法研究”(2020119)资助。

Concept,mechanism and significance of oxidation sensitivity of oil and gas reservoirs

You Lijun, Kang Yili, Zhou Yang, Chen Qiang, Cheng Qiuyang, Xu Jieming, Chen Yang   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China
  • Received:2020-02-25 Revised:2020-12-09 Online:2021-02-25 Published:2021-02-07

摘要: 储层损害和流体敏感性等概念的提出使油气储层保护成为油气勘探与开发领域的重要研究方向,储层保护技术从系统工程理论出发,研究工程作业与地质对象的适应性问题,为油气田开发提供重要理论支持和技术保障。生烃层中形成的油气会发生滞留或短距离运移、初次运移和二次运移至储集层中,不仅多数油气仍然保留着还原性,而且也将储层岩石还原;源-储一体的非常规油气藏岩石富含有机质组分,且处于还原环境,而在钻完井液漏失、增产改造、注水等过程中大量氧化性流体可能进入油气储层,打破氧化-还原环境。鉴于此,提出了油气储层氧敏性的概念,明确了储层氧敏性的矿物组分与氧敏机理,并开展变氧化-还原电位流体驱替页岩岩心实验。研究结果表明,处于还原环境下油气储层易发生氧敏性,有机质和黄铁矿等还原性矿物组分氧化可改变岩石渗透率;油气储层氧敏性概念的提出为岩心保存、岩心流动实验提出了新要求,为储层损害机理诊断提供了新思路,助推了页岩“人工油气藏”氧化致裂增渗方法的提出。

关键词: 氧敏性, 氧敏矿物, 氧化-还原电位, 有机质, 页岩, 非常规油气

Abstract: With the proposing of the concepts of reservoir damage and fluid sensitivity, reservoir protection has become an important research direction in the field of oil and gas exploration and development. Based on the theory of system engineering, reservoir protection technology investigates the adaptability of engineering operations with geological objects, thus providing great theoretical and technical supports for the development of oil and gas field. Oil and gas formed in the hydrocarbon-generating layer will be retained or migrated a short distance, or migrated into the reservoir by primary migration and secondary migration. Most of oil and gas not only retain reducibility, but also cause the reduction reaction of reservoir rock. The unconventional oil and gas reservoir rocks featured with source-reservoir integration are rich in organic components and remain in a reducing environment. However, a large number of oxidizing fluids may enter the oil and gas reservoirs during the processes of drilling and completion fluid loss, reservoir stimulation, water injection, thus change the redox environment. In view of this, the authors propose the concept of oxidation sensitivity of oil and gas reservoirs, clarify the mineral compositions which are potential to oxidation sensitivity and the mechanism of reservoirs, and conduct an experiment on the displacement of shale cores by variable oxidation-reduction potential fluids. The research results show that oil and gas reservoirs are prone to oxidation sensitivity in a reducing environment. The oxidation of organic matter, pyrite and other reducing mineral components can change rock permeability. The concept of oxidation sensitivity provides new requirements for core preservation and core flow experiments, as well as new ideas for the analysis of reservoir damage mechanisms, and promotes the proposal of oxidation fracturing and permeability enhancing methods of "artificial oil and gas reservoirs" in shales.

Key words: oxidation sensitivity, oxidation sensitive minerals, redox potential, organic matter, shale, unconventional oil and gas

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