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Glossary:Gas supply chain segments
Upstream - The upstream sector/segment of the natural gas supply chain, which includes activities and/or operations involving the exploration, development, and production. (Note - In some circumstances, this section of the supply chain may also include gas gathering pipelines, gathering compressor stations, and gas processing plants.)
Midstream - The midstream sector/segment of the natural gas supply chain, which includes gas transmission, storage and LNG regasification terminals.
(Note - In some documents, the distribution grid and/or the gas-processing plants are considered part of this segment of the supply chain).
Downstream/Distribution system - The segment of the natural gas supply chain covering distribution activities delivering gas to end-users.[1]