2025-03-24-未来能源研究所-边缘甲烷分子从哪里来_液化天然气出口对美国天然气供应和甲烷排放的影响（英）_47页_6mb

Summary

Introduction

US liquefied natural gas (LNG) exports have surged over the past decade, raising concerns about their impact on domestic natural gas prices and methane emissions. This paper analyzes the economic implications of increased export demand on oil and gas supply and methane emissions, addressing debates on whether LNG exports contribute more to emissions than coal.

Key Findings

• Each additional 1 billion cubic feet per day (Bcf/d) of gas export demand increases domestic natural gas prices by approximately 2.5% while modestly reducing crude oil prices by 0.5% due to coproduced oil.
• The marginal gas supply response to gas export demand disproportionately comes from basins with low methane leak rates, such as Appalachia, resulting in an effective methane intensity of 1.7%, lower than the average of 3.1%.
• In contrast, increased oil demand shifts marginal supply to high-leakage basins like the Permian, leading to a very high effective methane intensity of 9.1%.
• The 2015 repeal of the crude oil export ban drove significantly more methane emissions than LNG exports during 2015-2023, with impacts equivalent to about 20 Bcf/d of gas exports.

Methodology

The study employs a Dynamic Oil and Gas Market Analysis (DOGMA) model to simulate US oil and gas supply responses to export demand shocks, incorporating basin-level methane leak rates based on empirical data.

Results

For gas exports, higher demand reduces gas prices moderately and shifts supply to low-emission basins. For oil exports, the induced gas supply and crowding-out effects lead to high methane emissions. Scenario analyses show that export-induced price changes are linear and have substantial cumulative effects.

Conclusions

The paper suggests that stricter scrutiny of oil exports might be needed to address methane emissions effectively, as they generate significantly higher emissions than LNG exports. Policy decisions should consider these marginal supply shifts to mitigate environmental impacts.