石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (5): 1048-1055.doi: 10.11743/ogg20180518

• 油气勘探 • 上一篇    下一篇

不同温压下页岩动态与静态弹性模量转换研究

王飞1, 边会媛2,3, 张永浩4, 段朝伟4, 赵伦5, 李建新5   

  1. 1. 长安大学 地质工程与测绘学院, 陕西 西安 710054;
    2. 西安科技大学 地质与环境学院, 陕西 西安 710054;
    3. 国土资源部煤炭资源勘查与综合利用重点实验室, 陕西 西安 710021;
    4. 中国石油集团测井有限公司, 陕西 西安 710077;
    5. 中国石油 勘探开发研究院, 北京 100083
  • 收稿日期:2018-02-22 修回日期:2018-06-11 出版日期:2018-10-28 发布日期:2018-09-06
  • 第一作者简介:王飞(1983-),男,博士、讲师,测井解释与岩石物理实验。E-mail:wangfeijlu-147@163.com。
  • 基金项目:
    国家科技重大专项（2017ZX05030-002）；国土资源部煤炭资源勘查与综合利用重点实验室开放课题基金项目（KF2018-4）；中国石油天然气集团公司科学研究与技术开发项目（2016A-3603）；中央高校基本科研业务费项目（310826172204）。

Experimental study on dynamic and static elastic modulus conversion for shale under different temperatures and pressures

Wang Fei1, Bian Huiyuan2,3, Zhang Yonghao4, Duan Chaowei4, Zhao Lun5, Li Jianxin5   

  1. 1. School of Geological and Surveying & Mapping Engineering, Chang'an University, Xi'an, Shaanxi 710054, China;
    2. College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China;
    3. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, MLR, Xi'an, Shaanxi 710021, China;
    4. CNPC Logging Ltd., Xi'an, Shaanxi 710077, China;
    5. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2018-02-22 Revised:2018-06-11 Online:2018-10-28 Published:2018-09-06

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摘要： 岩石动态与静态弹性参数存在差异，在应用时需要进行转换。目前国内外学者对岩石动态与静态弹性模量转换实验多在常温与常压下进行测试，没有考虑温度和压力对测试结果的影响，导致转换结果不能充分反映储层力学性质。本次研究以四川盆地上奥陶统和下志留统的五峰组-龙马溪组黑色页岩为研究目标，开展不同温度与压力条件下岩石动态与静态弹性力学实验，并对测试结果进行分析。结果表明：①当温度与压力一定时，动态杨氏模量测试值比静态杨氏模量测试值大，并且二者有一定的线性相关性；②页岩动态与静态杨氏模量均与温度、压力有关，温度一定时，页岩动、静态杨氏模量均随着围压的增大而增大；压力一定时，页岩动态与静态杨氏模量均随着温度升高而降低，并对不同温度、压力条件下动、静态弹性力学参数变化规律进行了机理分析；③建立了不同温度、压力条件下页岩动态与静态弹性参数转换模型，该模型可以将任意温度、压力条件下测试的动态弹性参数转换为储层条件下岩石的静态弹性参数，并能取得较好效果。利用本模型可以为研究区页岩气开采及注水压裂施工方案提供可靠的静态弹性模量，研究具有一定的实际意义。

关键词: 杨氏模量, 泊松比, 动态与静态弹性模量, 储层, 页岩, 五峰组, 龙马溪组, 四川盆地

Abstract: There are differences between dynamic and static elastic parameters of shale.Thus when applied,they need to be converted.Most experiments carried out today by both domestic and foreign scholars in testing rock dynamic and static elastic modulus conversion are under normal temperature and pressure,without considering the influence of temperature and pressure on the results;consequently,the conversion results cannot fully display the mechanical properties of reservoirs.We studied the Wufeng-Longmaxi black shales of the Upper Ordovician and Lower Silurian in the Sichuan Basin,conducted mechanical experiments of rock dynamic and static elasticity under different temperatures and pressures,and analyzed the test results.The results show that:① when the temperature and pressure are constant,the dynamic Young's modulus test value is larger than that of the static Young's modulus test,and the two have a certain linear correlation.② The dynamic and static Young's moduli for shales are correlated with temperature and pressure.When the temperature keeps constant,the static and dynamic Young's moduli of shales increase with the increase of confining pressure.When the pressure is constant,the static and dynamic Young's moduli of shales decrease with the increasing temperature.Besides,the mechanism for the change of dynamic and static elastic mechanical parameters under different temperatures and pressures was analyzed.③ The conversion model for dynamic and static elastic parameters of shales under different temperatures and pressures was established.In applying the model,whatever the temperature and pressure,the dynamic elastic parameter obtained can be converted into the in-situ static one,and the results are reliable.This model can provide credible static moduli of elasticity for shale gas exploitation and hydraulic fracturing in the study area.All in all,the research is of certain practical significance.

Key words: Young's modulus, Poisson's ratio, dynamic and static elastic moduli, reservoir, shale, Wufeng Formation, Longmaxi Formation, Sichuan Basin

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