Identification of Key Greenhouse Gas Emission Sources for Construction Activities of an Integrated Oil and Gas Company.

Abstract An integrated oil and gas company requires regular investments to construct new plants and facilities to sustain its operations and production. The construction of these new facilities by the third-party contractors results in emissions of greenhouse gases (“GHG”) from various sources. To identify the key GHG emission sources from the construction activities of such large capital projects, GHG emissions were calculated for a representative sample of projects. The results were then extrapolated to the remaining unsampled projects to estimate the total emissions from each type of GHG emission source. It was determined that marine vessels used for offshore installation projects were the most significant source of GHG emissions as it accounted for 85% of the total emissions from all construction activities. This indicates that any efforts to reduce GHG emissions from oil and gas construction activities would be most impactful if it is focussed on offshore installation projects. However, the quantum of these emissions that originate from the third-party contractors’ activities is relatively insignificant compared to the emissions from sources that are owned or operated directly by an oil and gas company.