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Deep Groundwater Flow Patterns Induced by Mine Water Injection Activity.

Ge Chen1, Zhimin Xu1, Dmytro Rudakov2

  • 1School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China.

International Journal of Environmental Research and Public Health
|December 11, 2022
PubMed
Summary

Mine water injection into deep formations helps reduce coal mine drainage. However, groundwater levels in the Liujiagou Formation may not fully recover due to low permeability, impacting long-term water management.

Keywords:
Liujiagou Formationdeep groundwater flowmine water injectionstorage capacity

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Area of Science:

  • Hydrogeology
  • Environmental Science
  • Geology

Background:

  • Mine water injection is crucial for managing coal mine drainage in arid regions.
  • Understanding deep groundwater flow is vital for mine water monitoring and protection.
  • Limited research exists on deep groundwater flow patterns influenced by mine water injection.

Purpose of the Study:

  • To investigate the spatial distribution and hydrogeological properties of the Liujiagou Formation.
  • To analyze regional groundwater flow directions and storage capacities under mine water injection.
  • To assess the impact of mine water injection on groundwater levels and recovery potential.

Main Methods:

  • Analysis of geological structures and spatial distribution of the Liujiagou Formation.
  • Evaluation of dynamic storage capacity using geological data.
  • Development of basin-scale hydrogeologic cross-sections to identify groundwater flow.
  • Numerical simulation to predict groundwater head rebound and recovery time.

Main Results:

  • The Liujiagou Formation's spatial distribution correlates with terrain and geological structures.
  • Sandstone aquifers have limited storage, with 61.9% being dry rock; mudstone aquicludes restrict vertical leakage.
  • Dynamic storage capacity is estimated at 2.36 Mm³ per km² and over 25.10 billion m³.
  • Regional groundwater flow is W-E and N-S, with discharge into the lower Yellow River catchment.
  • Mine water drainage creates a depression cone, while injection forms a mound in the Liujiagou Formation.
  • Groundwater head rebound is limited, with recovery unlikely within 500 years due to low porosity and permeability.

Conclusions:

  • Mine water injection significantly alters local and regional groundwater dynamics.
  • The Liujiagou Formation offers substantial storage but limited recharge potential.
  • Long-term groundwater management strategies are needed due to slow recovery rates.
  • This study provides a framework for monitoring and managing mine water injection activities.