Feasibility Study of Geothermal Dolomite Reservoir Reinjection Using Surface Water in Tianjin, China

 1. Introduction

This study introduces the feasibility of reinjecting surface water into geothermal dolomite reservoirs in Tianjin, China, focusing on sustainable geothermal energy exploitation. It outlines the significance of reinjection in maintaining reservoir pressure, preventing land subsidence, and enhancing heat recovery while addressing environmental and operational challenges in urban geothermal systems.

2. Geological Characteristics of Dolomite Reservoirs

This topic examines the structural and mineralogical properties of dolomite reservoirs, emphasizing porosity, permeability, and fracture systems that influence reinjection efficiency. Understanding these geological parameters is essential for predicting fluid migration, thermal exchange, and long-term reservoir stability in geothermal applications.

3. Surface Water as a Reinjection Medium

This section evaluates the feasibility of using surface water for geothermal reinjection, considering chemical compatibility, scaling risks, and potential reservoir clogging. The analysis highlights treatment requirements and monitoring strategies to ensure sustainable integration of surface water into geothermal systems.

4. Hydrothermal Performance and Pressure Maintenance

This topic focuses on how reinjection impacts reservoir pressure, temperature distribution, and thermal recovery rates. The findings demonstrate the role of controlled reinjection in extending geothermal resource life and improving system efficiency.

5. Environmental and Sustainability Impacts

This section assesses environmental benefits and risks, including groundwater protection, reduced emissions, and mitigation of land subsidence. The study supports geothermal reinjection as a low-carbon solution aligned with sustainable energy and environmental protection goals.

6. Implications for Future Geothermal Development

This topic discusses how the study’s findings can guide future geothermal projects in China and globally. It highlights policy relevance, technological optimization, and research opportunities to advance geothermal reinjection practices and support clean energy transitions.


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