Various studies have described upon importance of the performance of multilevel slug tests to assess hydraulic conductivity of aquifer sediment. For this study, slug tests were performed at 33 locations in 107 numbers of observation wells under six physiographic divisions in the Bengal Basin, Bangladesh. The objective of this paper is to evaluate the potential of multilevel slug tests to determine depth distribution and vertical variations of hydraulic conductivity in layered aquifer systems of the Bengal Basin that can be utilized for resource assessment. The studied aquifer sediments are dominated by unconsolidated fine and very fine sand with lenses of clay and silty clay aquitards. The hydraulic conductivity values commonly correspond with the lithology and their settlements. The unconsolidated sand in the Active and Tidal Delta contains high hydraulic conductivity values of up to 24.4 m/day. Older sediments in the Teppera Surface and Coastal Plain show lower average hydraulic conductivity. Very low hydraulic conductivities in few wells indicate the heterogeneities as well as poor development of these newly installed wells. Individual layers have relatively uniform grain size with well sorted sands, and their hydraulic conductivity values have a small variation, while sediments from multiple layers have variations in grain size with anisotropic signature and their hydraulic conductivity values, in many cases, vary by orders of magnitude. However, multilevel slug tests can provide considerable information about vertical variations in hydraulic conductivity under the right conditions. Although the slug tests were performed with precaution, unknown uncertainties in the well during the operation may influence the values of hydraulic conductivity. A more accurate values of the conductivity variations can be achieved by placing thin, low-conductivity layers in the sand pack that reduces vertical flow. Selection of drilling procedure and the techniques of measurement and analysis are also important to get good results. Factors like leakage and partial penetration should also be minimal for optimum results

各种研究都描述了多级段塞试验对评估含水层沉积物的水力传导率的重要性。在本研究中，在孟加拉国孟加拉盆地 6 个自然地理分区的 107 个观测井的 33 个位置进行了段塞测试。本文的目的是评估多级段塞试验的潜力，以确定可用于资源评估的孟加拉盆地分层含水层系统中水力传导率的深度分布和垂直变化。所研究的含水层沉积物主要是松散的细砂和极细砂，带有粘土透镜体和粉质粘土隔水层。水力传导率值通常与岩性及其沉降相对应。活动和潮汐三角洲的松散沙子含有高达 24.4 m/天的高导水率值。Teppera 表面和沿海平原的较老沉积物显示出较低的平均水力传导率。少数井的水力传导率非常低表明这些新安装的井的非均质性和较差的开发。单个层的粒度相对均匀，砂粒分选良好，其导水率值变化很小，而多层沉积物的粒度变化具有各向异性特征，其导水率值在许多情况下相差几个数量级. 然而，多级段塞试验可以提供有关在适当条件下水力传导率垂直变化的大量信息。虽然段塞试验是谨慎进行的，但作业过程中井中未知的不确定性可能会影响水力传导率的值。通过在沙堆中放置薄的、低电导率的层来减少垂直流动，可以获得更准确的电导率变化值。钻井程序的选择以及测量和分析技术对于获得良好结果也很重要。泄漏和部分渗透等因素也应尽量减少以获得最佳效果 钻井程序的选择以及测量和分析技术对于获得良好结果也很重要。泄漏和部分渗透等因素也应尽量减少以获得最佳效果 钻井程序的选择以及测量和分析技术对于获得良好结果也很重要。泄漏和部分渗透等因素也应尽量减少以获得最佳效果