Athens - based Omega, which operates a fleet of
refined fuel tankers, listed assets of $ 527 million against liabilities of $ 360 million in its bankruptcy filing.
«Upstream» in this instance refers to infrastructure of oil extraction and production (e.g., Arctic oil and gas extraction), «midstream» refers to transportation (e.g., the Trans - Alaska Pipeline System, railways, oil
tankers, and barges), and «downstream» refers to
refining, processing, and distributing fossil
fuel products to consumers.