Subtopic Deep Dive
CO2 Sequestration in Coal Seams
Research Guide
What is CO2 Sequestration in Coal Seams?
CO2 sequestration in coal seams injects supercritical CO2 into unmineable coalbeds, leveraging coal's preferential adsorption of CO2 over methane to enable simultaneous carbon storage and enhanced coalbed methane recovery.
This process exploits coal's higher affinity for CO2, displacing adsorbed methane for extraction while storing CO2 long-term. Key studies include competitive adsorption experiments, coal swelling effects, and injectivity tests under reservoir conditions. Over 20 papers from 2005-2022, with White et al. (2005) review garnering 984 citations, document adsorption isotherms, geomechanical modeling, and pore alterations.
Why It Matters
CO2 sequestration in coal seams supports climate mitigation by storing gigatons of CO2 in unmineable reserves while boosting methane recovery for energy needs (White et al., 2005; Li and Fang, 2014). Fan et al. (2019) optimize CO2/N2 mixtures for 20-30% higher ECBM yields in deep seams. Connell and Detournay (2008) model coupled flow-geomechanics, predicting injectivity limits critical for field-scale pilots like Allison Unit, advancing dual-benefit fossil fuel utilization.
Key Research Challenges
Coal Swelling Blocks Permeability
CO2 adsorption induces coal matrix swelling, reducing fracture permeability by up to 50% and limiting injectivity (Connell and Detournay, 2008). Fan et al. (2019) report modeling shows swelling dominates over adsorption in low-rank coals. Cleats clog within weeks of injection.
Preferential Adsorption Uncertainty
CO2/methane selectivity varies 5-20x by coal rank and moisture, complicating recovery predictions (Wang et al., 2015). White et al. (2005) review isotherms from 15 coals shows exposure alters capacities by 15%. High-rank coals favor CO2 less predictably.
Pore Alteration from ScCO2
Supercritical CO2 dissolves minerals, enlarging micropores but collapsing mesopores, changing storage capacity (Kang et al., 2022; Zhang et al., 2017). Effects persist post-exposure, impacting long-term sequestration security. Mechanisms involve organic extraction and inorganic precipitation.
Essential Papers
Sequestration of Carbon Dioxide in Coal with Enhanced Coalbed Methane RecoveryA Review
Curt M. White, Duane H. Smith, Kenneth L. Jones et al. · 2005 · Energy & Fuels · 984 citations
This article reviews the storage of captured CO2 in coal seams. Other geologic formations, such as depleted petroleum reservoirs, deep saline aquifers and others have received considerable attentio...
Modelling and optimization of enhanced coalbed methane recovery using CO2/N2 mixtures
Chaojun Fan, Derek Elsworth, Sheng Li et al. · 2019 · Fuel · 223 citations
Gas Transportation and Enhanced Coalbed Methane Recovery Processes in Deep Coal Seams: A Review
Xiaogang Zhang, P.G. Ranjith, M.S.A. Perera et al. · 2016 · Energy & Fuels · 154 citations
Coalbed methane (CBM) is a potential green energy supply for addressing the worldwide energy crisis. However, the recovery of economically viable amounts of methane requires the application of prod...
Effect of maceral composition and coal rank on gas diffusion in Australian coals
Alireza Keshavarz, Richard Sakurovs, Mihaela Grigore et al. · 2017 · International Journal of Coal Geology · 133 citations
Mineral dissolution and pore alteration of coal induced by interactions with supercritical CO2
Chen Kang, Xianfeng Liu, Baisheng Nie et al. · 2022 · Energy · 124 citations
Coupled flow and geomechanical processes during enhanced coal seam methane recovery through CO2 sequestration
Luke D. Connell, Christine Detournay · 2008 · International Journal of Coal Geology · 124 citations
Coal Pores: Methods, Types, and Characteristics
Pengwei Mou, Jienan Pan, Qinghe Niu et al. · 2021 · Energy & Fuels · 112 citations
Coal pores are the locations of coalbed methane occurrence and enrichment and the main storage space targeted in CO2 sequestration. The systematic investigation of the coal pore structure and its d...
Reading Guide
Foundational Papers
Start with White et al. (2005) for adsorption fundamentals and ECBM review (984 cites), then Connell and Detournay (2008) for coupled flow-geomechanics modeling essential to injectivity.
Recent Advances
Fan et al. (2019) for CO2/N2 optimization in deep seams; Kang et al. (2022) for ScCO2 mineral-pore interactions; Mou et al. (2021) for pore structures in sequestration targets.
Core Methods
Langmuir/BET isotherms for adsorption (White et al., 2005); finite element modeling for swelling-permeability (Connell and Detournay, 2008); NMR/SEM for pore evolution (Zhang et al., 2017; Kang et al., 2022).
How PapersFlow Helps You Research CO2 Sequestration in Coal Seams
Discover & Search
Research Agent uses searchPapers('CO2 sequestration coal seams ECBM') to retrieve White et al. (2005) with 984 citations, then citationGraph reveals 200+ citing works like Fan et al. (2019), and findSimilarPapers expands to Li and Fang (2014) overview.
Analyze & Verify
Analysis Agent runs readPaperContent on Fan et al. (2019) to extract adsorption models, verifies swelling predictions via verifyResponse (CoVe) against Connell and Detournay (2008), and uses runPythonAnalysis to plot selectivity ratios from isotherm data with GRADE scoring for model fidelity.
Synthesize & Write
Synthesis Agent detects gaps in swelling-permeability coupling post-2019 via gap detection on 50+ papers, flags contradictions between Wang et al. (2015) and Kang et al. (2022) pore effects, then Writing Agent applies latexEditText for ECBM equations, latexSyncCitations for 20 references, and latexCompile for report with exportMermaid flowcharts of injection processes.
Use Cases
"Plot CO2/methane adsorption isotherms from coal rank studies"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas plot Krevor-Luzar isotherms from White et al. 2005 + Wang et al. 2015 data) → matplotlib figure with GRADE-verified R²>0.95.
"Write LaTeX review on ECBM swelling challenges citing 15 papers"
Synthesis Agent → gap detection → Writing Agent → latexEditText (structure sections) → latexSyncCitations (White 2005 et al.) → latexCompile → PDF with equations and exportMermaid geomechanical diagram.
"Find GitHub repos modeling CO2 injectivity in coals"
Research Agent → paperExtractUrls (Fan 2019) → Code Discovery → paperFindGithubRepo → githubRepoInspect → verified TOUGH2 simulations for permeability evolution.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers → citationGraph on White et al. (2005) → structured report ranking ECBM models by validation dataset size. DeepScan applies 7-step CoVe to verify Fan et al. (2019) optimizations against field data from Li and Fang (2014). Theorizer generates hypotheses on mineral dissolution from Kang et al. (2022) + Zhang et al. (2017) pore data.
Frequently Asked Questions
What defines CO2 sequestration in coal seams?
Injection of supercritical CO2 into coalbeds exploits 3-10x higher CO2 adsorption affinity over methane, storing CO2 while recovering CH4 (White et al., 2005).
What are core methods studied?
Competitive adsorption isotherms (Wang et al., 2015), geomechanical modeling of swelling (Connell and Detournay, 2008), and ScCO2 pore alteration via SEM/porosimetry (Kang et al., 2022).
What are key papers?
White et al. (2005, 984 cites) reviews fundamentals; Fan et al. (2019, 223 cites) optimizes CO2/N2 ECBM; Li and Fang (2014, 105 cites) covers challenges.
What open problems remain?
Long-term CO2 retention post-swelling (Connell and Detournay, 2008), rank/moisture effects on selectivity (Wang et al., 2015), and field-scale injectivity beyond pilots (Li and Fang, 2014).
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Part of the Coal Properties and Utilization Research Guide