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How are the physical characteristics of the coal-fluid system reflected in ultrasound?

Researchers studied acoustic characteristics of gas-liquid-solid linkage in CBM reservoirs, analyzing P-wave and S-wave response to fluid saturation under different coal rank conditions. The study found that the relative anisotropy increased with water saturation, suggesting stronger acoustic anisotropy in tectonic coals.

SourceHigher Education Press·JournalFrontiers of Earth Science·TypeExperimental study·DateApr 28, 2022

Analysis: Risk aversion plays an important role in the coal-contracting behavior of US power plants

A new analysis by Carnegie Mellon University researcher Akshaya Jha finds that risk aversion drives the purchasing of coal primarily from long-term contracts, resulting in premium prices. The study estimates that if power plants purchased all their coal from the spot market, annual aggregate cost savings would be $2.9 billion on average.

SourceCarnegie Mellon University·JournalJournal of the Association of Environmental and Resource Economists·DateJan 17, 2022