Alternative evaluation methods are assessed by numerical modeling of pumping tests in three‐dimensional fracture networks. Network scale heterogeneity, fracture‐to‐fracture scale heterogeneity, and individual fracture scale heterogeneity (fracture roughness) are considered as representative of multi‐scale hydraulic and structural heterogeneity of crystalline rocks. The results show that ambient hydraulic gradient has a negligible effect on transmissivity inference of sparsely fractured rocks using flow logs. Consequently, the common dual pumping method used to account for the ambient flow can be simplified to a single pumping. This could potentially reduce the site characterization effort in typical applications such as nuclear waste disposal. The transmissivity inference method based on the Thiem solution provides representative median transmissivity. It, however, underestimates relatively high transmissivities due to its inability to account for the impact of fracture roughness. These findings have important implications regarding pumping test schemes and data interpretation methods in the hydrogeological characterization of sparsely fractured rocks using flow‐log data.

中文翻译：

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稳态抽运和环境流动对晶体岩石流向记录数据的评估

通过在三维裂缝网络中进行抽水试验的数值模型来评估替代评估方法。网络规模的非均质性，裂缝间的裂缝非均质性和单个裂缝规模的非均质性（裂缝粗糙度）被认为是结晶岩多尺度水力和结构非均质性的代表。结果表明，利用流动测井，环境水力梯度对稀疏裂隙岩石的透射率推断的影响可忽略不计。因此，可以将用于考虑环境流量的通用双泵方法简化为单泵。这可能会减少典型应用（如核废料处理）中的现场表征工作。基于Thiem解的透射率推断方法可提供代表性的中值透射率。但是，由于它无法解决断裂粗糙度的影响，因此低估了相对较高的透射率。这些发现对于利用流向测井资料对稀疏裂隙岩石的水文地质特征进行抽水试验方案和数据解释方法具有重要意义。