金塔盆地与鼎新谷地地质接触关系及其地电特征研究

金塔盆地与鼎新谷地之间的地质接触关系,至今为止还没有系统的研究。金塔盆地与鼎新谷地之间的水力联系一直不能做出正确判断。在分析区域资料的基础上,进行了研究区地质调查,并在国内首次开展了该问题的地电研究工作,对比了地质接触关系与地电特征的符合程度,并进一步分析了金塔盆地与鼎新谷地的地质接触关系和水力联系。地电特征研究结果显示金塔盆地和鼎新谷地地质接触关系及其地电特征存在明显的一一对应关系。结论认为黑河干流下部存在古近系砂砾岩、砂岩和泥质粉砂岩基底隆起及其伴随断层,该基底隆起和伴随断层构成了金塔盆地和鼎新谷地之间的地质接触关系,并且阻碍了两者之间的地下水水力联系。研究工作为黑河下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。

Study on Geological Contact Relationship and Geoelectrical Properties between Jinta Basin and Dingxin Valley

So far it is not systemically studied in geological contact relationship between Jinta Basin and Dingxin Valley. Hydraulic connection between Jinta Basin and Dingxin Valley is now hard to conclude. Based on regional data analysis, geological survey is conducted in the study area, and geoelectrical research is also performed. It is compared to find if geoelectrical properties accord with geological contact relationship, and geological contact relationship and hydraulic connection between Jinta Basin and Dingxin Valley are analyzed. Geoelectrical research results show that there is evident one-to-one match between geological contact relationship and geoelectrical properties. The conclusion can be drawn that there are basal bulge consisted of Tertiary glutenite, sandstone and argillaceous siltstone under Heihe River trunk stream, and the basal bulge is accompanied by some faults. Basal bulge and faults form geological contact relationship and hinder hydraulic connection between Jinta Basin and Dingxin Valley. It can provide scientific foundation for underground water resources evaluation, regional ecological condition treatment and recovery of lower Heihe River.