Estimation of Combustion Efficiency and Methane Emissions from Oil and Gas Platform Flarings Based on in Situ Observed Data from the Bohai Sea
Based on the reanalysis of ship-borne continuous data observed in 2012 and 2014 and"bottom-up"and"top-down"approaches,the combustion efficiency and CH4 emission rate of flaring equipped on oil and gas platforms in the Penglai Region of the Bohai Sea were studied.The results showed that peak atmospheric CO2 and CH4 mixing ratios of approximately(11～20)×10-6 and(100～260)×10-9 were observed in the downwind area of flaring.The calculated combustion efficiency of associated gas flaring was(97.8±1.1)％,which was better than that in most countries worldwide.The CH4 emission rates of flaring equipped on the oil and gas platforms were 3.6～6.1 Gg/a and 1.80～2.68 Gg/a,estimated using the"bottom-up"and"top-down"approaches,respectively,indicating that the flaring was the primary source of atmospheric CH4.On the other hand,the difference in the results estimated by the"bottom-up"and"top-down"approaches was still remarkable,mostly due to the limited spatiotemporal representation of emission factors and observation data.This study is beneficial for promoting the recycling and reuse of associated gas and reducing CH4 emissions from marine oil and gas exploitation in China.
Bohai SeaOil and gas platformFlareMethaneTop-down approach
NETL
NSTL
万方数据
