一、前言南宁地区总面积39,047平方公里,岩溶地区约占总面积的53.3％(图1)。碳酸盐类岩层从中泥盆统到三迭系均有出露。建国以来,在岩溶地区兴建的大量中小型水库,有些做过比较详细的地质勘测工作,有些则做得很粗或甚至完全没有做。经过多年的蓄水考验,不少工程蓄水良,好一部分工程虽出现问题,但经过修补,也能发挥一定效益。但是,也还有相当一部分工程存在着严重的岩溶渗漏问题,影响了工程效益。根据对本地区94座库容在50万立方米以 I. Foreword The total area of ​​Nanning is 39,047 square kilometers and the karst area accounts for 53.3% of the total area (Figure 1). Carbonate rocks are exposed from Middle Devonian to Triassic. Since the founding of the PRC, a large number of small and medium-sized reservoirs have been built in karst areas. Some have done more detailed geological surveys and some have done very crude or even none at all. After years of water storage test, many projects have good water storage capacity. Although some of the projects have problems, they can also play a certain role after being repaired. However, there are still a considerable part of the project there is a serious problem of karst leakage, affecting the project efficiency. According to 94 blocks in the region storage capacity of 500,000 cubic meters