陕北能源化工基地烧变岩的分布特征及其水文地质意义

在分析陕北能源基地烧变岩岩性特征及形成条件的基础上,归纳叙述了烧变岩的分布规律和烧变岩分布区的水文地质特征、地下水形成条件,并简要论述了烧变岩的富水性及其水文地质意义.烧变岩主要分布在秃尾河、窟野河及其支沟的两侧,呈条带状展布,长度十到几十千米,宽度一般1～2 km,分布面积近700km2.烧变岩裂隙、孔洞发育,十分有利于上部萨拉乌苏组殚地下水的越流补给,通常以大泉的形式排泄于近沟脑的部位,流量、水质稳定;或于烧变岩底部盆形构造区富集,利用烧变岩地下水可缓解近期能源基地供水紧张的局面.

Distribution characteristics of burnt metamorphic rocks in the Northern Shaanxi Energy and Chemical Industry Base and their hydrogeological significance

The authors summarize and describe the distribution characteristics of burnt metamorphic rocks and hydrological characteristics and formation conditions of groundwater in areas of burnt metamorphic rocks based on an analysis of the lithologic characteristics and formation conditions of burnt metamorphic rocks, and briefly discuss their water storage capacity and hydrogeological significance. Burnt metamorphic rocks are mainly distributed on both sides of the Tuwei River and Kuye River and their tributary gullies. They are elongated with a length ranging from ten to tens of kilometers and a width of 1-2 km, covering an area of nearly 700 km2. Fractures and pores are well developed in the burnt metamorphic rocks, which is very favorable to the leakage recharge from the upstream groundwater of the Salawusu Formation. The groundwater generally discharges in the form of big springs near the source of grooves, with stable flow and water quality; or the water concentrates in the bathtub-shaped structure on the bottom of burnt metamorphic rocks. The water can alleviate the situation of shortages of water supply in the energy base in the near term.