塔克拉玛干沙漠水文地质特征的音频大地电磁测深法勘查效果

以北纬 40°为界 ,塔克拉玛干沙漠可分为两大沉积区 ,即北部为东西向塔里木河干流形成的古老和近现代的冲洪积泛滥平原 ,南部为发源于昆仑山北坡的诸多水系形成的古老或近现代冲 (湖 )积细土平原。查明两大沉积区的水文地质特征 ,为开展塔克拉玛干沙漠古地理环境变迁和地下水系统的演化具有十分重要的意义。音频大地电磁测深法在沿塔中公路勘查塔克拉玛干沙漠水文地质特征中 ,电性特征很好地反映出两个不同沉积区及与之对应的水文地质单元 ,同时根据电性分布特征 ,绘制了塔中公路沿线的地下水水质分布规律 ,并对塔里木河的早、中、晚期古河道的演化进行了推测 ,为开展塔里木盆地地下水形成演化提供了科学依据。

THE EFFECT OF AUDIOMAGNETOTELLURIC SOUNDING PROSPECTING FOR DETECTING HYDROGEOLOGICAL CHARACTERISTIC IN TAKELAMGAN DESERT

With north latitude 40 as boundary, the Takelamgan desert can be divided into two big sedimentary areas, which are north alluvial flood plain generated by west and east Tarim river and south alluvial lacustrine fine grain plain generated by lots of river system originated from north side of KunLun mountain. To find the hydrogeological character of two sedimentary areas can help study the change of palaeogeographic environment and the evolvement of groundwater system. In order to find the hydrogeological character of Takelamgan desert, the prospecting work has been done with audiomagnetotelluric sounding method along Tazhong road. This paper presents the application effect. The feature of electric property shows perfectly the two different sedimentary area and the corresponding hydrogeological unit. At the same time, based on the distribution of resistivity, we plot the groundwater quality map, and infer the evolutive process of palaeo-river course. The information provides the scientific evidence for the reasearch of groundwater generation and evolvement.