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Inference of field-scale fracture transmissivities in crystalline rock using flow log measurements

机译：利用流量测井法推断晶体岩石中现场尺度裂缝的透射率

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摘要

Characterization of transmissivity for crystalline rock is conducted through simulation by conditioning against borehole flow rates obtained from high-resolution, in situ field measurements during extraction pumping. Full three-dimensional discrete fracture network simulations are carried out according to specifications obtained from site characterization data in a stochastic Monte Carlo setting. A novel method of conditioning is thereby introduced and applied using nonparametric comparison tests, which provide quantifiable measures of accuracy enabling evaluation of simulated results against field measurements. The assumption of a constitutive relationship (perfect correlation) between fracture size and transmissivity is adopted. The method is evaluated against both single and multiple realizations, various domain size, and fracture length configurations and shown to be robust for the cases considered. When the introduced method of conditioning is applied, transmissivity parameterization can be inferred to a narrow range with a quantifiable accuracy in terms of a probability value. Results indicate that elementary interpretation of transmissivity based on homogenization of a porous medium will generally underestimate transmissivity. Further implications on advective transport for natural flow conditions are briefly evaluated, indicating advective breakthrough times can be overestimated up to a factor of about 10 in the median.
机译：结晶岩的透射率表征是通过模拟来进行的，模拟条件是对抽取抽水过程中从高分辨率原位现场测量获得的井眼流速进行调节。根据在随机蒙特卡洛设置中从现场特征数据获得的规范，执行完整的三维离散裂缝网络模拟。因此，引入了一种新颖的调节方法，并使用非参数比较测试进行了应用，该测试提供了可量化的精度度量，从而能够根据现场测量评估模拟结果。假定裂缝尺寸和透射率之间的本构关系（完美相关）。该方法针对单个和多个实现，各种域大小和裂缝长度配置进行了评估，并且对于所考虑的情况显示出很强的鲁棒性。当采用引入的调节方法时，可以根据概率值将透射率参数化推断为较窄的范围，并且具有可量化的精度。结果表明，基于多孔介质均质化的透射率的基本解释通常会低估透射率。简要评估了对自然流动条件下对流运输的进一步影响，表明对流突破时间可能被高估了，最高达中位数的约10倍。

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  • 来源
    《Water resources research》 |2010年第11期|p.W11502.1-W11502.17|共17页
  • 作者

    A. Frampton; V. Cvetkovic;

  • 作者单位

    Department of Quaternary Geology and PhysicalGeography, Stockholm University, SE-I069I Stockholm, Sweden, Now at Department of Quaternary Geology and Physical Geography. Stockholm University, Stockholm. Sweden;

    Department of Water Resources Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden;

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