岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 54–61.doi: 10.12108/yxyqc.20190406

• 油气地质 • 上一篇    下一篇

一种基于应力-应变特征的岩石脆性指数评价改进方法

曹茜1,2, 戚明辉1,2, 张昊天3, 黄毅1,2, 张烨毓1,2   

  1. 1. 页岩气评价与开采四川省重点实验室, 成都 610091;
    2. 四川省科源工程技术测试中心, 成都 610091;
    3. 成都理工大学 油气藏地质及开发工程国家重点实验室, 成都 610059
  • 收稿日期:2018-12-21 修回日期:2019-03-29 出版日期:2019-07-21 发布日期:2019-06-21
  • 作者简介:曹茜(1986-),女,博士,工程师,主要从事非常规油气储层评价及岩石力学研究工作。地址:(610091)四川省成都市青羊区青羊工业园F区15栋1001号。Email:421664225@qq.com。
  • 基金资助:
    四川省科技厅科技计划支撑项目"页岩气资源评价检测服务示范"（编号：2017GFW0175）和四川省省院省校科技合作研发项目"四川盆地上二叠统海陆过渡相页岩气成藏条件研究"（编号：2018JZ0003）联合资助

An improved method for evaluating rock brittleness index based on stress-strain curve characteristics

CAO Qian1,2, QI Minghui1,2, ZHANG Haotian3, HUANG Yi1,2, ZHANG Yeyu1,2   

  1. 1. Sichuan Province Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610091, China;
    2. Sichuan Keyuan Testing Center of Engineering Technology, Chengdu 610091, China;
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
  • Received:2018-12-21 Revised:2019-03-29 Online:2019-07-21 Published:2019-06-21

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摘要： 脆性指数作为岩石力学评价的重要指标之一，对准确评价岩石脆性特征具有重要意义。选取四川盆地新场气田须家河组五段的21块岩石样品，对其开展室内三轴岩石力学实验，分别模拟了样品在围压0 MPa，12 MPa，22 MPa，32 MPa下的三轴饱水力学和声学测试，基于岩石应力-应变曲线分析不同岩石脆性特征参数的差异，分别计算基于杨氏模量的脆性因子（BYm）、基于泊松比的脆性因子（Bμ）、基于可恢复应变与总应变的脆性因子（BRε）、基于屈服强度与抗压强度的脆性因子（BRσ），并对比、分析了现有的基于应力-应变曲线的脆性评价方法，进而综合室内岩石力学测试结果建立了脆性指数Bn与BYm，Bμ，BRε，BRσ的函数关系式，通过多元回归方法建立新的脆性指数模型，对岩石样品的脆性进行评价。结果表明：传统的脆性指数评价方法在区分岩石样品脆性时效果不佳；改进后的模型能够更好地区分研究区高脆性泥岩、低脆性泥岩和砂岩。该研究结果对于准确评价岩石脆性特征具有指导意义。

关键词: 脆性指数评价, 应力-应变曲线, 改进方法, 归一化

Abstract: As one of the important indexes for rock mechanics evaluation,the evaluation of brittleness index is of great significance to rock characteristics. 21 rock samples of the fifth member of Xujiahe Formation of Xinchang Gas Field in Sichuan Basin were selected to carry out laboratory triaxial rock mechanics experiments. Triaxial saturation hydraulics and acoustic tests of samples under confining pressure of 0 MPa,12 MPa,22 MPa and 32 MPa were simulated respectively. Based on the stress-strain curve characteristics,the differences of different brittleness characteristic parameters were analyzed. The brittleness factors such as BYm,Bμ,BRε and BRσ respectively based on Young's modulus,Poisson's ratio,recoverable strain and total strain,and yield strength and compressive strength,were calculated. The existing brittleness evaluation methods based on stress-strain curves were compared and analyzed,and the functional relationships of brittleness index Bn with BYm,Bμ,BRε and BRσ were established according to the laboratory rock mechanics test results. A new brittleness index model was established by multiple regression method to evaluate the brittleness of rock samples. The results show that the conventional brittleness index evaluation method is not effective in distinguishing brittleness of rock samples,and the improved model can better distinguish high brittle mudstone,low brittle mudstone and sandstone in the study area. The study results have guiding significance for accurately evaluating the brittleness characteristics of rocks.

Key words: brittleness index evaluation, stress-strain curves, improved method, normalization

中图分类号: 

  • TU45
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