Methane emissions from contrasting production regions within Alberta, Canada: Implications under new federal methane regulations

Aggressive reductions of oil and gas sector methane, a potent greenhouse gas, have been proposed in Canada. Few large-scale measurement studies have been conducted to confirm a baseline. This study used a vehicle-based gas monitoring system to measure fugitive and vented gas emissions across Lloydminster (heavy oil), Peace River (heavy oil/bitumen), and Medicine Hat (conventional gas) developments in Alberta, Canada. Four gases (CO2, CH4, H2S, C2H6), and isotopic δ13CCH4 were recorded in real-time at 1 Hz over a six-week field campaign. A point-source gaussian plume dispersion model was used to quantify emissions rates. We sampled 1,299 well pads, containing 2,670 unique wells and facilities, in triplicate. Geochemical emission signatures of fossil fuel-sourced plumes were identified and attributed to nearby, upwind oil and gas well pads. Emission occurrences and rates were highest in Lloydminster, where 40.8% of sampled well pads were estimated to be emitting methane-rich gas above our...

加拿大已提出针对油气行业甲烷（一种强效温室气体）的大幅减排方案，但目前鲜有大型实测研究可用于确立该行业的排放基线。本研究采用车载气体监测系统，对加拿大阿尔伯塔省劳埃德明斯特（Lloydminster，重油油区）、皮斯里弗（Peace River，重油/沥青油区）以及梅迪辛哈特（Medicine Hat，常规天然气油区）的油气开发区块内的无组织泄漏与放空气体排放开展了实测。本次野外作业周期为六周，以1赫兹的采样频率实时记录了四种气体（二氧化碳(CO₂)、甲烷(CH₄)、硫化氢(H₂S)、乙烷(C₂H₆)）以及甲烷碳同位素δ¹³C_CH₄的监测数据。研究采用点源高斯羽流扩散模型对排放速率进行量化分析。本研究对1299座井场开展了三次重复采样，共覆盖2670口独立井及配套设施。研究识别出了化石燃料来源羽流的地球化学排放特征，并将其归因于附近上风方向的油气井场。劳埃德明斯特区域的排放发生频次与排放速率均为最高，据估算，该区域40.8%的采样井场所排放的富甲烷气体浓度超出了本次研究设定的基准值（原文后续内容未完整提供）。