供給途絶下における原油・LNG貿易の経路変更が輸送排出に与える影響
Transportation Emission Impacts of Crude Oil and LNG Trade Rerouting Under Supply Disruptions (原題)
Hao-Ming Ma, Wen-Nan Long, A. Ravikumar
🤖 gxceed AI 要約
日本語
ホルムズ海峡途絶を想定した3つの6ヶ月シナリオで、パイプライン・代替ターミナル・供給者代替による追加輸送排出を推計。追加排出は5.9〜6.4 Mt CO2eでシナリオ間でほぼ同水準だが、パイプラインと海運間で配分が変化する。上流排出強度の差が大きく、イラン産原油の米国産代替は輸送ペナルティを相殺し得る一方、カタール産LNGの代替は排出を確実に増やす。
English
This study quantifies incremental transport GHG emissions from pipeline rerouting, alternative terminals, and supplier substitution under three six-month Hormuz disruption scenarios. Added transport emissions are similar across scenarios (5.9–6.4 Mt CO2e) but redistribute between pipeline and shipping. Because Gulf producers' upstream emission intensities vary widely, replacing high-EI Iranian/Iraqi crude with U.S. crude can offset the transport penalty, whereas replacing Qatar's cleaner LNG reliably adds emissions.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は中東原油・LNGへの依存度が高く、ホルムズ海峡リスクはエネルギー安全保障と排出量算定の両面で重要。Scope 3上流排出の評価や調達先変更時の排出影響を考える上で、日本の事業者・政策担当者に示唆を与える。
In the global GX context
Adds to global disclosure scholarship by linking energy-security disruption scenarios to Scope 3 upstream and transport emission accounting, relevant to TCFD/ISSB climate-risk and transition planning for importers and traders.
👥 読者別の含意
🔬研究者:供給途絶シナリオと上流排出強度を組み合わせた輸送排出推計手法の実例として参照できる。
🏢実務担当者:調達先変更や経路変更がScope 3・輸送排出に与える影響を評価する際の枠組みとして活用できる。
🏛政策担当者:エネルギー安全保障政策と排出削減政策のトレードオフを検討する材料になる。
📄 Abstract（原文）
The Strait of Hormuz carries approximately 14.3 million barrels per day of crude oil and 78 Mt yr-1 of liquefied natural gas (LNG) from major Middle Eastern producers, making it the most critical maritime chokepoint for global energy trade. A disruption at this corridor would compel producers to activate bypass infrastructure and importers to source alternative supply, each option carrying distinct greenhouse gas (GHG) emission consequences. This study develops a transport-emission accounting framework that quantifies the incremental GHG emissions from pipeline rerouting, alternative-terminal utilization, and supplier replacement under three operationally grounded six-month disruption scenarios. The framework couples country-level upstream emission intensities (EIs) from the Oil Production Greenhouse Gas Emissions Estimator (OPGEE v3.0c) and a measurement-informed LNG life-cycle assessment (LCA) with IMO-based pipeline and shipping emission factors. Scenario 1 combines partial Saudi rerouting to Yanbu and UAE rerouting to Fujairah with maximum U.S. replacement of Iranian and Iraqi crude and Qatari LNG. Scenario 2 adds Iraqi rerouting through Turkey's Ceyhan terminal, limiting U.S. crude replacement to Iranian volumes. Scenario 3 maximizes regional bypass by rerouting Iranian crude through the Jask terminal, restricting U.S. involvement to LNG. The added transport emissions are similar across scenarios (5.9–6.4 Mt CO2e over six months) but redistribute between pipeline and shipping. When supplier-substitution effects on upstream EI are included, the net outcome is governed by the extreme EI heterogeneity of Gulf producers (Saudi Arabia 1.24 versus Iran 13.11 g CO2e MJ−1): because displaced Iranian and Iraqi barrels are exceptionally carbon-intensive, replacing them with U.S. crude tends to offset—and can exceed—the transport penalty, whereas replacing Qatar's comparatively clean LNG with higher-EI U.S. LNG reliably adds emissions. The one robust, always-positive cost of disruption is the transport penalty; upstream methane and flaring mitigation at high-EI producers matters more to the total outcome than the routing choice itself.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.2118/234070-msfirst seen 2026-10-17 05:07:57 · last seen 2026-11-06 05:16:06
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