酒泉东盆地与张掖盆地地质接触关系及其电性特征研究

The geological contact relationship and geoelectrical properties between Jiuquan East Basin and Zhangye Basin

酒泉东盆地与张掖盆地之间的地质接触关系,至今为止还没有系统的研究。酒泉东盆地与张掖盆地之间的水力联系一直不能做出正确的判断。在分析区域资料的基础上,进行了研究区地质和电性特征研究工作,对比了地质接触关系与电性特征的符合程度,并进一步分析了酒泉东盆地与张掖盆地的地质接触关系和水力联系。电性特征研究结果显示酒泉东盆地与张掖盆地地质接触关系及其电性特征存在明显的一一对应关系。研究结论认为酒泉东盆地与张掖盆地的地质接触关系为北西-南东向的古近系新近系泥岩、砂质泥岩隆起,且该隆起导致酒泉东盆地与张掖盆地在中、南部地下水水力联系比较微弱,而北部基本无水力联系。研究工作为黑河中游地下水水资源量评价、区域生态环境治理和恢复提供了科学的依据。

So far it is not systemically studied in geological contact relationship between Jiuquan East Basin and Zhangye Basin. Hydraulic connection between Jiuquan East Basin and Zhangye Basin is now hard to conclude. Based on regional data analysis, geological survey and geoelectrical research were conducted in the study area. It was compared to find if the geoelectrical properties accord with geological contact relationship, and geological contact relationship and hydraulic connection between Jiuquan East Basin and Zhangye Basin were analyzed. Geoelectrical properties research resuhs show that there is evident one - to - one match between geological contact relationship and geoelectrical properties. The conclusion can be drawn that there is bulge consisted of Paleogene -Neogene mudstone, sandy mudstone with trend of northwest - southeast, and the bulge form geological contact relationship. Because of the bulge, it shows faint hydraulic connection in the middle and south of research area, and the bulge basically hinders hydraulic connection in the north. It can provide scientific foundation for underground water resources evaluation, regional ecological condition treatment and recovery of Heihe River middle reaches.