Recent legislative initiatives, and subsequent regulatory moves, have increased interest in accurate assessment of O&G methane emissions. Additionally, O&G operators have publicly committed to report and reduce methane as part of voluntary programs for measurement and reporting standards. The natural gas supply chain is traditionally divided into several sectors, including exploration and production, gas processing, distribution, and `midstream' transport operations including gathering and boosting (G&B), transmission and storage (T&S), and liquied natural gas (LNG). While the supply chain is trans-national, production through midstream sectors occur in every production basin.