Publication Details

Title : Updated natural gas pathways in the GREET1_2018 model
Publication Date : October 04, 2018
Authors : A. Burnham
Abstract : Argonne National Laboratory researchers have been analyzing the environmental impacts of natural gas (NG) production and use for more than 15 years. With the rapid development of shale gas production in the past few years, significant efforts have been made to examine various stages of natural gas pathways to estimate their life-cycle impacts. In 2011, Argonne researchers examined the uncertainty associated with key parameters for shale gas and conventional NG pathways to identify data gaps that required further attention (Clark et al. 2011). Clark et al. (2011) based much of their analysis of methane (CH4) emissions on the United States Environmental Protection Agency’s (EPA’s) 2011 greenhouse gas inventory (GHGI), as this was the first EPA GHGI to incorporate shale gas and included significant revisions to its liquid unloading leakage estimates (EPA 2011). In addition, the report examined the water, materials, and fuel needed to drill and construct NG wells. From 2013 to 2016, Argonne researchers updated the GREET model based on EPA’s latest GHG inventories, which included several methodological changes for estimating natural gas CH4 emissions (Burnham et al. 2013; Burnham et al. 2014; Burnham et al. 2015; Burnham 2016). In 2015 and 2017, Argonne analyzed the environmental impacts, including CH4 leakage and air pollutant emissions, of heavy-duty natural gas vehicles (Cai et al. 2015; Cai et al. 2017). In 2017, GREET was updated based on the work documented in Cai et al. (2017), which examined natural gas vehicle upstream freshwater consumption, greenhouse gas (GHG) emissions, and nitrogen oxides (NOx) and particulate matter (PM) emissions as well as supplementary analysis of the 2017 EPA GHGI (Burnham 2017).

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