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Geoscience ›› 2021, Vol. 35 ›› Issue (03): 675-681.DOI: 10.19657/j.geoscience.1000-8527.2020.041

• Water Resources and Environmental Geology • Previous Articles     Next Articles

Hydrogeological Features and Groundwater Enrichment Model of Paleogene Zhujiagou Formation in Lower Chaiwen River Valley, Shandong Province

LI Bo1,2(), WU Xuan1,2, ZHANG Yifei1,2, XU Congcong1,2, LIU Chunwei1,2, GUAN Qin1,2, LUO Fei1,2   

  1. 1. No.801 Hydrogeology and Engineering Geology Brigade of Shandong Exploration Bureau of Geology and Mineral Resources,Jinan, Shandong 250014,China
    2. Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater, Jinan,Shandong 250014,China
  • Received:2019-04-21 Revised:2020-06-15 Online:2021-06-23 Published:2021-06-24

Abstract:

The Paleogene Zhujiagou Formation in south-central Shandong comprises a molassic sequence dominated by calcareous breccia, and has markedly varying water-yield properties caused by faults. Based on the regional hydrogeological survey in lower Chaiwen River valley, the aquifer characteristics, water-yield properties, and groundwater hydrochemical characteristics are analyzed. The results show that the Zhujiagou Formation comprises calcareous cemented calcirudite, and karst is developed above 90 m depth with single-well yield of 100-300 m3/d, locally reaching >300 m 3/d. Groundwater in the fissured or karst aquifers in the southern Wenkou Basin are similar, indicating close interactions between the two. The Gibbs map demonstrates that the groundwater hydrochemical features are dominated by rock-weathering, and evaporation and concentration. The ions in the groundwater are mainly sourced from rock dissolution and anthropogenic pollution. Based on drill-hole data analysis, the groundwater enrichment model is a fracture-type calcirudite karst-fissure water storage one, and we consider that fractured clastic rocks can be used as an emergency water exploration target.

Key words: Chaiwen River, Paleogene Zhujiagou Formation, hydrochemical characteristic, groundwater enrichment mode

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