西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (6): 13-18.DOI: 10.11885/j.issn.1674-5086.2019.09.16.12

• 页岩气开发专刊 • 上一篇    下一篇

页岩带压渗吸核磁共振响应特征实验研究

肖文联1, 张骏强1, 杜洋2, 赵金洲1, 赵哲军2   

  1. 1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川 成都 610500;
    2. 中国石化西南油气分公司石油工程技术研究院, 四川 德阳 618008
  • 收稿日期:2019-09-16 出版日期:2019-12-10 发布日期:2019-12-10
  • 通讯作者: 肖文联,E-mail:joshxiao@163.com
  • 作者简介:肖文联,1983年生,男,汉族,四川渠县人,副教授,博士,主要从事非常规油气藏渗流物理及油气田开发等方面的教学与科研工作。E-mail:joshxiao@163.com;张骏强,1995年生,男,汉族,四川成都人,硕士研究生,主要从事油气田开发等方面的研究工作。E-mail:1632955126@qq.com;杜洋,1984年生,男,汉族,四川射洪人,助理研究员,主要从事页岩气排水采气、动态监测等方面的科研设计工作。E-mail:duyang1004@126.com;赵金洲,1962年生,男,汉族,湖北仙桃人,教授,博士生导师,主要从事油气田开采和增产新技术新理论的研究工作。E-mail:zhaojz@swpu.edu.cn;赵哲军,1979年生,男,满族,黑龙江七台河人,高级工程师,主要从事气井采输方面的研究工作。E-mail:7296308@qq.com
  • 基金资助:
    四川省科技计划重点研发项目(2018JZ0079)

An Experimental Study on NMR Response Characteristics of Imbibition Subjected to Pressure in Shale

XIAO Wenlian1, ZHANG Junqiang1, DU Yang2, ZHAO Jinzhou1, ZHAO Zhejun2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Engineering and Technology Research Institute, Southwest Oil and Gas Company, SINOPEC, Deyang, Sichuan 618008, China
  • Received:2019-09-16 Online:2019-12-10 Published:2019-12-10

摘要: 为进一步认识页岩气储层岩石中压裂液等外来流体的影响,选择四川某页岩气藏岩样完成了不带压和带压下渗吸核磁共振响应特征实验。结果表明,不带压自发渗吸过程中,岩样的T2谱曲线峰值增加、两翼扩展,从单峰特征变成了双峰特征,表明页岩岩样中的渗吸量随时间的增加不断地增加,并形成了新的孔缝系统,这与扫描电镜实验观察的渗吸前后孔隙结构变化结果一致。带压渗吸过程中,岩样的T2谱曲线表现为单峰特征,且基本上不发生变化;当卸载应力后完成不带压自发渗吸实验时,岩样的T2曲线表现出了与之前不带压自发渗吸实验观察一致的结果,这说明岩样上作用的应力影响页岩的渗吸特征。因此,在页岩渗吸实验评价及应用中应考虑应力敏感性的影响。

关键词: 渗吸, 应力敏感性, 核磁共振, 页岩, 微观结构

Abstract: The imbibition of shale samples from the Sichuan Basin are studied under different pressure cycles using the technology of NMR in order to have some insight into the influence of invading fluids in shale gas reservoirs. The results show that the T2 curve of sample S1 (confining pressure 0) gradually expands during the process of spontaneous imbibition and changes from a single peak to bimodal ones, indicating that the amount of imbibition continuously increases and a new pore-fracture system is formed, which is observed in microstructure experiments. Meanwhile, the T2 curve of sample S2 (confining pressure 8 MPa) has single peak and almost remain unchanged; when the confining pressure on sample S2 is unloaded, the T2 curve turns into the bimodal ones, which is consistent with the results of sample S1, illustrating that the stress on the shale sample has an effect on the imbibition of shale. Therefore, it is suggested that the effect of stress sensitivity on shale imbibition should be considered in future study and application.

Key words: imbibition, stress sensitivity, nuclear magnetic resonance, shale rock, pore structure

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