Sustainability of Geothermal Water Production from Carbonate Reservoirs Evaluated

Strategic Insights -

Research conducted by a team of scientists at the Chinese Academy of Sciences has shed light on the sustainability of geothermal water production from carbonate reservoirs, an emerging low-carbon energy source. The study focused on the origin and evolution of fractures in Mesoproterozoic carbonates of the North China Craton (NCC) and developed a fracture-fluid evolution model to evaluate the long-term sustainability of geothermal production. The research identified three principal phases of fracturing at approximately 1550-973 Ma, 669-597 Ma, and 106-58 Ma, with clumped isotope-derived temperatures ranging from 57.1°C to 93.6°C. The study's findings have significant implications for the assessment of fractured geothermal systems worldwide.

Key Takeaways:

  • The study highlights the importance of understanding the origin and evolution of fractures in evaluating the long-term sustainability of geothermal water production from carbonate reservoirs.
  • The research developed a fracture-fluid evolution model for Mesoproterozoic carbonates of the North China Craton (NCC) by integrating U-Pb dating of fracture-filling dolomites with petrological, micro-CT, and multi-isotopic analyses.
  • Three principal phases of fracturing were identified at approximately 1550-973 Ma, 669-597 Ma, and 106-58 Ma, with clumped isotope-derived temperatures ranging from 57.1°C to 93.6°C.
  • The study's integrated methodology offers a transferable framework for evaluating fractured geothermal systems worldwide.
  • The research has significant implications for the assessment of fractured geothermal systems and the development of low-carbon energy sources.
  • The study's findings have been peer-reviewed and published in the journal Basin Research.

Statistics:

  • Approximately 1550-973 Ma: first phase of fracturing dates back to this period.
  • 669-597 Ma: second phase of fracturing occurred during this time period.
  • 106-58 Ma: third phase of fracturing took place during this time period.
  • 57.1°C-93.6°C: clumped isotope-derived temperatures range from 57.1°C to 93.6°C.
  • The study's research has been conducted in the North China Craton (NCC), a Mesoproterozoic carbonate reservoir.

Sources:

  • Multiphase Fracturing, Fluid Evolution, and Geothermal Sustainability In Mesoproterozoic Carbonates of the North China Craton. Basin Research, 2025;37(5). DOI: onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2117
  • NewsRx. Investigators at Chinese Academy of Sciences Describe Findings in Sustainability Research (Multiphase Fracturing, Fluid Evolution, and Geothermal Sustainability In Mesoproterozoic Carbonates of the North China Craton). China Weekly News. October 14, 2025; p 213.