中文摘要：

地下水资源是长江三角洲地区社会经济发展的重要后备资源。根据江苏宝应境内钻取的145m深的By1孔岩芯，沉积物粒度分析显示，钻孔20m之下有5个主要的含水层，主要是粉砂质砂层，其间是粘土质粉砂层隔水层；在钻孔60m之下有3个厚度超过10m的含水层，显示该区域深部地下水资源十分丰富，具有较大的开发价值。宝应钻孔揭示的地下含水层上覆广泛分布末次冰盛期的硬质粘土层，对地下水资源起到明显的保护作用，未来地下水资源开发中应重视“硬粘土层”的保护和防止海水内侵，并加强深层地下水资源的科学调查与开发管理。

英文摘要：

The North Jiangsu Plain is rich in ground water,and the ground water resource is the potential water source for the regional social and economic development in the future. In this paper, the grain size of sediments and the aquifer vertical distribution were studied for borehole Byl in the North Jiangsu Plain. Core Byl is located in Baoying County, the North Jiangsu Plain and its core is 145 meters long. The grain size analyzing results indicate that there are five main aquifers bellow the depth of 20 meters and the ground water is held in silty sand layers. The five main aquifers are distributed at the depths of 32 - 37m,49 - 56m,76 - 89m, 104 - 121m, and 133-143m. Below the depth of 60 meters in Core Byl there are three aquifers to be identified with the thickness over 10 meters,which demonstrate that there might be more ground waters at deeper depths. The exploitation of ground water resources in the North Jiangsu Plain has a great economic value. The aquifers in the study area was covered or protected by ＂hard clay layers＂, which are widely distributed in the North Jiangsu Plain and were formed in the last glacial period,when the sea level was 150 meters bellow the present sea level. The protecting of the ＂hard clay layers＂ to prevent from sea water intrusion should be seriously considered during the exploitation of ground water in the North Jiangsu Plain at present. The scientific investigation and comprehensive management should be enhanced in the future.