A draft report by the Environmental Protection Agency, issued in December, appeared to confirm their concerns, linking chemicals in local groundwater to gas drilling.
Depends on the groundwater composition, gas venting may be necessary in maintaining PRB performance in the field.
A net radon flux into the stream of 5.4 × 104 Bq m−1 d−1 is required to balance radon losses to groundwater recharge, gas transfer and radioactive decay.
Failure of wellbore integrity leads not only to negative financial consequences, but also potentially to significant environmental impacts, such as groundwater contamination, gas leakage to the atmosphere, and fluid spills and seepage at the surface.
This approach has been applied successfully to improving mine subsidence management, groundwater and gas control at coal mines in Australia.
Accurate assessment of mining-induced strata changes is an essential step towards understanding coupled strata, groundwater and gas behaviours, which depends on reliable site geotechnical conditions.
This integrated approach has resulted in significant insights into the complex dynamic interaction between strata, groundwater, and gas during mining at Huainan Mining Group in recent years.
With this approach, the studies have resulted in significant insights into the complex dynamic interaction between strata, groundwater, and gas during mining.
These studies have resulted in significant insights into the complex dynamic interaction between strata, groundwater, and gas during mining at HMG and provided fundamentals to support optimal design and planning for the co-extraction of coal and gas system.
The central part of this approach is state of the art techniques for site geotechnical characterisation, field monitoring, and numerical modelling, as well as a full integration of strata, groundwater and gas studies.
Over the last decade, CSIRO and HMG in China have completed several major collaborative research projects to study coupled behaviours of mining induced strata, groundwater and gas to support co-extraction of coal and methane planning and design in various mining conditions at HMG, including Guqiao, Xieyi, Pansan, and Zhuji.
