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长春市杨屯供水水源地为白垩系青山口组紫红色泥岩和青灰色细砂岩的薄层互层,岩质坚硬致密,孔隙不发育。区内受南北向张扭性构造控制,呈一南北延伸的窄条裂隙发育带。建立水源地之前,曾在3.5平方公里面积内进行了水文地质勘察与抽水试验,共钻孔28个其中有8个探采结合的生产井(图1),进行了抽水试验(2个井做两次抽降,其余均做一次降低),另外的13个钻孔为勘探孔,大部均做一次简易地试验性抽水。
The source of Yangtun water supply in Changchun City is the interbedded layer of purplish-red mudstone and bluish-gray fine sandstone in the Qingshankou Formation of the Cretaceous. The rock is hard and dense with no pores. The area is dominated by the north-south trending twist structure, showing a narrow-strip fracture zone extending north-south. Prior to the establishment of the water source, hydrogeological surveys and pumping tests were conducted over a 3.5-sq km area, drilling a total of 28 production wells (Figure 1) with 8 exploration and production combined, and pumping tests (2 wells were made Pumping twice, the rest are reduced once), the other 13 holes for exploration holes, most of them do a simple experimental pumping.