Natural gas composition varies by well, but most wells include methane, natural gas liquids, and various undesirable substances called impurities.
Typical composition of raw natural gas:
Prior to entering the gas transmission system, natural gas is processed in a processing facility. The processing facility separates the raw gas into methane, natural gas liquids, and impurities. The resulting useful products are pipeline-quality natural gas and natural gas liquids (NGLs).
Typical composition of pipeline-quality natural gas:
Typical natural gas liquid streams after processing: