基于新型岩性结构指数法的含水层富水性预测

Prediction of Aquifer Water Richness Based on New Lithologic Structure Index

摘要: 陕西榆林矿区侏罗系煤田主要水患之一为第四系萨拉乌苏组含水层，其普遍具有富水性弱到强、且极不均一的特点，造成利用传统方法对含水层富水性的预测结果往往与实际条件具有较大差异。在岩性结构指数法的基础上，选取了砂岩厚度、岩心采取率、砂泥岩交互层数、砂岩含量等作为影响富水性的主控因素，构建新型岩性结构指数，对含水层进行富水性分级分区，并利用含水层抽水试验成果对评价结果进行验证。结果表明：新型岩性结构指数法对研究区含水层富水性的预测结果可靠，提供了含水层富水性评价的一种新思路。

Abstract: One of the main water disasters of Jurassic coal field in Yulin mining area of Shaanxi Province is the aquifer of Salawusu Formation of Quaternary system, which is generally characterized by weak to strong and extremely uneven water richness. As a result, the prediction results of water richness of aquifer by traditional methods are often quite different from the actual conditions. On the basis of the lithologic structure index method, the thickness of sandstone, the core adoption rate, the number of sand-mudstone interlayers and the content of sandstone are selected as the main controlling factors affecting the water richness, and a new lithologic structure index is constructed to carry out the water richness classification of aquifer, and the evaluation results are verified by the results of aquifer pumping test. The results show that the new lithology structure index method is reliable in predicting the aquifer richness and provides a new way to evaluate the aquifer richness.