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Application of multiple-point geostatistics on modelling pumping tests and tracer tests in heterogeneous environments with complex geological structures

机译：多点地统计学在复杂地质结构异质环境中抽水试验和示踪剂试验建模中的应用

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摘要

In heterogeneous environments with complex geological structures, analysis of pumping and tracer tests is often problematic. Standard interpretation methods do not account for heterogeneity or simulate this heterogeneity introducing empirical zonation of the calibrated parameters or using variogram-based geostatistical techniques that are often not able to describe realistic heterogeneity in complex geological environments where e.g. sedimentarystructures, multi-facies deposits, structures with large connectivity or curvi-linear structures can be present.Multiple-point geostatistics aims to overcome the limitations of the variogram and can be applied in different research domains to simulate heterogeneity in complex environments. In this project, multiple-point geostatistics is applied to the interpretation of pumping tests and a tracer test in an actual case of a sandy heterogeneous aquifer. This study allows to deduce the main advantages and disadvantages of this technique compared to variogram-based techniques for interpretation of pumping tests and tracer tests.A pumping test and a tracer test were performed in the same sandbar deposit consisting of cross-bedded units composed of materials with different grain sizes and hydraulic conductivities. The pumping test and the tracer test are analyzed with a local 3D groundwater model in which fine-scale sedimentary heterogeneity is modelled using multiple-point geostatistics. To reduce CPU and RAM requirements of the multiple-point geostatistical simulation steps, edge properties indicating the presence of irregularly-shaped surfaces are directly simulated. Results show that for the pumping test as well as for the tracer test, incorporating heterogeneity results in a better fit between observed and calculated drawdowns/concentrations. The improvement of the fit is however not as large as expected. In this paper, the reasons for these somewhat unsatisfactory results are explored and recommendations for future applications of multiple-point geostatistics on pumping tests and tracer tests are formulated.
机译：在具有复杂地质结构的异质环境中，抽水和示踪剂测试的分析通常是有问题的。标准解释方法不考虑异质性，也不模拟这种异质性，引入校准参数的经验分区，或使用基于变异函数的地统计技术，这些技术通常无法描述复杂地质环境中的实际异质性，例如可能存在沉积结构，多相沉积，大连通性结构或曲线结构。多点地统计学的目的是克服变异函数的局限性，可用于不同的研究领域，以模拟复杂环境中的异质性。在该项目中，多点地统计学被用于解释砂质非均质含水层实际情况中的抽水试验和示踪剂试验。与基于变异函数的解释抽水测试和示踪剂测试的技术相比，这项研究可以推断出该技术的主要优点和缺点。具有不同晶粒尺寸和水力传导率的材料。使用局部3D地下水模型分析抽水试验和示踪剂试验，其中使用多点地统计学方法对精细尺度的沉积异质性进行建模。为了减少多点地统计模拟步骤的CPU和RAM需求，直接模拟表明存在不规则形状表面的边缘属性。结果表明，对于抽水测试以及示踪剂测试，结合异质性可以更好地拟合观察到的压降/浓度。但是，合身性的改善没有预期的那么大。在本文中，探讨了这些结果不太令人满意的原因，并提出了多点地统计学在抽水试验和示踪剂试验中未来应用的建议。

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