Geomechanical responses of reservoirs to cold CO2 injection: implications for carbon capture and storage
冷たいCO2注入に対する貯留層の地力学応答：炭素回収・貯留への影響 (AI 翻訳)
Zizhuo Xiang, Simon Holford, Rosalind King, Scott Mildren, Joshua Sage, Mojtaba Rajabi
🤖 gxceed AI 要約
日本語
CO2貯留の大規模化には、誘発地震や貯留層の健全性を評価する地力学デリスキングが不可欠である。従来は最大注入圧力に着目したが、低温CO2注入による熱収縮が断層安定性に影響を与える。本研究では、間隙圧と温度変化が主応力に非対称に作用することを示し、圧力-温度安定性図を用いた安全運転範囲の視覚化手法を提案する。
English
For upscaling CCS, geomechanical derisking is essential. This paper shows that cold CO2 injection causes thermal contraction, stressing faults asymmetrically. The authors introduce a pressure-temperature stability diagram to visualize safe operating envelopes, moving beyond conventional pore-pressure-only approaches.
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CCSプロジェクトを推進中であり、国内堆積盆地での貯留実現には地力学リスク評価が重要。本論文のP-T安定性図は、日本の貯留層条件に応用可能で、安全な注入計画策定に資する。
In the global GX context
Globally, CCS is critical for decarbonization, but geomechanical risks can hinder deployment. This paper provides a practical tool (P-T stability diagram) to assess coupled thermo-mechanical effects, directly applicable to storage site screening under various stress regimes.
👥 読者別の含意
🔬研究者:The coupled poro-thermo-elastic analysis and P-T stability diagram offer a novel framework for geomechanical assessment of CCS sites.
🏢実務担当者:The P-T stability diagram can be used to define safe injection conditions and avoid fault reactivation in CCS projects.
🏛政策担当者:Regulators can consider requiring coupled thermo-mechanical analysis in CO2 storage permits to ensure containment integrity.
📄 Abstract（原文）
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.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1071/ep25046first seen 2026-05-14 23:46:08
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