Geoscience Visual Presentation G05: Geomechanical responses of reservoirs to cold CO2 injection: implications for carbon capture and storage
地質科学ビジュアルプレゼンテーションG05：低温CO2注入に対する貯留層の地盤力学的応答：炭素回収・貯留への影響 (AI 翻訳)
Zizhuo Xiang
🤖 gxceed AI 要約
日本語
本論文は、低温CO2注入が高温貯留層に及ぼす地盤力学的影響を解析し、従来の圧力のみに基づく評価では断層安定性を誤評価する可能性を指摘。圧力-温度安定性図を導入し、安全な運転範囲を可視化する手法を提案。オーストラリアのクーパー盆地を事例に、熱収縮による応力変化が重要であることを示す。
English
This paper analyzes geomechanical responses to cold CO2 injection in hot reservoirs. It shows that pore-pressure-only assessments can mischaracterize fault stability risk. A novel pressure-temperature (P-T) stability diagram is introduced to visualize safe operating envelopes and identify critical stress pairs. The case study of Australia’s Cooper Basin demonstrates the importance of thermal contraction effects.
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
日本でもCCS実証・商用化が進む中、地盤力学リスクの正確な評価が安全性確保の鍵となる。本論文で提案されたP-T安定性図は、貯留層設計・運用のための実用的ツールとして期待される。
In the global GX context
As CCS deployment scales globally, robust geomechanical derisking is critical. This paper's coupled poro-thermo-elastic approach and P-T stability diagram offer a practical tool for screening CO2 storage sites, applicable to basins worldwide including those with high geothermal gradients.
👥 読者別の含意
🔬研究者:Provides a novel coupled poro-thermo-elastic analysis framework and P-T stability diagram for fault reactivation risk.
🏢実務担当者:Offers a visual tool (P-T diagram) for identifying safe injection conditions, aiding operational planning.
🏛政策担当者:Highlights need for regulatory guidelines incorporating thermomechanical effects in CCS site screening.
📄 Abstract（原文）
Geoscience Visual Presentation G05 To enable the upscaling of carbon capture and storage, robust geomechanical derisking is essential for minimising induced seismicity and preserving reservoir containment. Conventional screening approaches typically focus on maximum sustainable injection pressures, yet when cold supercritical CO2 is injected into hot reservoirs, thermal contraction induces additional stress perturbations that may significantly impact fault stability. This is particularly relevant for basins with elevated geothermal gradients, such as Australia’s Cooper Basin. In this study, we present a coupled poro-thermo-elastic analysis demonstrating that pore pressure and temperature perturbations affect principal stresses asymmetrically, producing complex Mohr circle evolution that varies across stress regimes. This asymmetry means the fault orientation most susceptible to reactivation depends on the stress state at failure rather than initial conditions, complicating conventional assessment approaches. To address this challenge, we introduce a pressure–temperature (P-T) stability diagram that directly links operational parameters to reactivation thresholds, enabling visualisation of safe operating envelopes and identification of governing stress pairs without iterative analysis. Our findings indicate that geomechanical analyses focused solely on pore pressure may mischaracterise reactivation risk, and coupled poro-thermo-elastic approaches are essential for accurate screening of CO2 storage sites. To access the Visual Presentation click on 'Supplementary data' below. To read the full paper click here
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1071/ep26484first seen 2026-06-20 05:35:18
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