A new look at methane and nonmethane hydrocarbon emissions from oil and natural gas operations in the Colorado Denver-Julesburg Basin
A new look at methane and nonmethane hydrocarbon emissions from oil and natural gas operations in the Colorado Denver-Julesburg Basin
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DOI：
10.1002/2013jd021272
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发表时间：
2014-06-16
影响因子：
4.4
通讯作者：
Schnell, Russ
中科院分区：
文献类型：
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作者：
Petron, Gabrielle;Karion, Anna;Schnell, Russ
2012年5月，利用基于飞机的甲烷观测、行星边界层高度和基于地面的风廓线测量，估计了位于科罗拉多东北部韦尔德县丹佛-朱尔斯堡盆地最密集钻井区域的石油和天然气（O&G）作业的甲烷（CH 4）排放量。5月29日和31日航班的自上而下的甲烷排放总量估计分别为25.8 +/- 8.4和26.2 +/- 10.7吨甲烷/小时。利用清单数据，我们估计这两天非O &G气体相关源的CH 4总排放量为7.1 +/- 1.7和6.3 +/- 1.0吨CH 4/小时。排放量的差异归因于研究区域的O&G源，其总排放量平均为19.3 +/- 6.9吨/小时，接近2012年环境保护局温室气体报告计划数据的每小时排放量估计值的3倍。我们从自上而下的甲烷总排放量估计和基于飞机的离散空气样本中的相对碳氢化合物丰度中得出丙烷，正丁烷，异戊烷，正戊烷和苯的自上而下的排放量估计。仅这五种非甲烷碳氢化合物的排放总量为25.4 +/- 8.2 t/h。假设这些排放量仅来自O& G相关的活动在研究区域，我们的研究结果表明，O&G活动排放的挥发性有机化合物总量的国家库存至少是一个因素2过低2012年5月。我们对O&G操作中苯排放量的自上而下的排放估计为173 +/- 64 kg/h，或比国家库存大7倍。
Emissions of methane (CH4) from oil and natural gas (O&G) operations in the most densely drilled area of the Denver-Julesburg Basin in Weld County located in northeastern Colorado are estimated for 2days in May 2012 using aircraft-based CH4 observations and planetary boundary layer height and ground-based wind profile measurements. Total top-down CH4 emission estimates are 25.8 +/- 8.4 and 26.2 +/- 10.7 t CH4/h for the 29 and 31 May flights, respectively. Using inventory data, we estimate the total emissions of CH4 from non-O&G gas-related sources at 7.1 +/- 1.7 and 6.3 +/- 1.0 t CH4/h for these 2days. The difference in emissions is attributed to O&G sources in the study region, and their total emission is on average 19.3 +/- 6.9 t/h, close to 3 times higher than an hourly emission estimate based on Environmental Protection Agency's Greenhouse Gas Reporting Program data for 2012. We derive top-down emissions estimates for propane, n-butane, i-pentane, n-pentane, and benzene from our total top-down CH4 emission estimate and the relative hydrocarbon abundances in aircraft-based discrete air samples. Emissions for these five nonmethane hydrocarbons alone total 25.4 +/- 8.2 t/h. Assuming that these emissions are solely originating from O&G-related activities in the study region, our results show that the state inventory for total volatile organic compounds emitted by O&G activities is at least a factor of 2 too low for May 2012. Our top-down emission estimate of benzene emissions from O&G operations is 173 +/- 64 kg/h, or 7 times larger than in the state inventory.