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頁岩貯留層における界面活性剤とCO2のハフ・アンド・パフ法による原油増進回収の細孔スケール・分子レベル解析

Pore-Scale and Molecular Insights into Surfactant and CO2 Huff-and-Puff for Enhanced Oil Recovery in Shale Reservoirs (原題)

Pengzhi Wei, Hongxian Liu, Shixun Bai, Dunqing Liu, Jie Dong

ACS Omega📚 査読済 / ジャーナル2026-08-20#CCUS対象セクター: oil_gas
DOI: 10.1021/acsomega.6c06479
原典: https://doi.org/10.1021/acsomega.6c06479

🤖 gxceed AI 要約

日本語

頁岩貯留層におけるCO2と界面活性剤のハフ・アンド・パフ法による原油増進回収（EOR）を、NMR実験と分子動力学シミュレーションで解析。CO2は累計回収率37.30%と界面活性剤（24.01%）を上回り、メソポアでの優位性が示された。一方、界面活性剤はミクロポアで高い効果を示し、分子機構の違いを解明。CCUSのCO2利用の理論的基盤を提供する。

English

This study investigates surfactant and CO2 huff-and-puff EOR in shale reservoirs using NMR experiments and molecular dynamics simulations. CO2 achieved higher cumulative recovery (37.30%) than surfactant (24.01%), excelling in mesopores, while surfactant performed better in micropores. Molecular mechanisms reveal CO2 affinity for saturated hydrocarbons and surfactant interactions with polar components. Findings support CCUS frameworks and composite EOR design.

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

日本ではCCUSがカーボンニュートラル戦略の柱の一つであり、CO2-EORは技術的知見として有用。ただし、国内の頁岩貯留層は限定的で、主に海外展開や技術輸出の観点で参考になる。

In the global GX context

Globally, CCUS is critical for decarbonization, and CO2-EOR offers a utilization pathway. This study provides molecular-level insights that can inform CCUS project design and efficiency, relevant to global climate mitigation strategies.

👥 読者別の含意

🔬研究者:Provides molecular-scale mechanisms of CO2 and surfactant EOR, useful for designing composite EOR methods and CCUS research.

🏢実務担当者:Offers insights for optimizing EOR operations in shale reservoirs, potentially improving CCUS project economics.

🏛政策担当者:Informs on the technical viability of CO2-EOR as a CCUS strategy, relevant for policy support and funding decisions.

📄 Abstract（原文）

This study systematically investigates the molecular mechanisms underlying the enhanced oil recovery (EOR) efficacy of surfactant and CO2 huff-and-puff processes across different pore sizes in shale reservoirs. By integrating nuclear magnetic resonance (NMR) experiments with molecular dynamics (MD) simulations, the differential behaviors of these two EOR agents at the pore scale were elucidated. NMR T2 spectroscopy reveals that CO2 huff-and-puff achieved superior cumulative recovery rates (37.30%) compared to surfactants (24.01%), primarily due to its miscibility with crude oil and efficient mobilization of mesopores (53.1% ± 3.7% contribution). Conversely, surfactants exhibited higher efficacy in micropores (47.8% ± 4.3% contribution), attributed to multiple synergistic mechanisms, including interfacial slip induced by near-zero interactions with rock surfaces, wettability alteration, and solubilization of adsorbed oil films. MD simulations further confirmed that CO2 exhibits a stronger affinity for saturated hydrocarbons, while surfactants preferentially interact with polar components (nonanoic acid, nonanone) via Coulomb-dominated hydrogen bonding and hydration, enhancing light oil extraction. The results from experimental observations and molecular-level insights underscore the distinct advantages of CO2 and surfactants in huff-and-puff processes, providing a theoretical foundation for designing composite methods to optimize recovery efficiency. This research bridges macroscopic performance discrepancies with nanoscale mechanisms, advancing the understanding of carbon dioxide utilization in carbon capture, utilization, and storage (CCUS) frameworks.

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