An experimental study on element migration and pore evolution during supercritical carbon dioxide geological sequestration in deep coal seams of the Ningxia region, China
中国寧夏地域の深部炭層における超臨界二酸化炭素地中貯留時の元素移動と細孔構造進化に関する実験的研究 (AI 翻訳)
Xu, Jie, Ma, Yu, Cui, Beiqu, Ma, Lirong, Tian, Jingxiong, Wu, Wenzhong, Zhang, Yong, Hou, Shangjie, Huang, Shengjin, Wang, Lili
🤖 gxceed AI 要約
日本語
本研究は中国寧夏地域の深部炭層を対象に、超臨界CO2と水・石炭の反応実験を行い、元素移動特性と孔隙構造の変化を解明した。その結果、有害元素の溶出は極めて低く、CO2貯留サイトとしての安全性が高いことを示した。また、貯留後の微細孔隙が増加し、CO2の吸着固定に有利であることを明らかにした。これはCCUS技術の実用化に重要な科学的根拠を提供する。
English
This experimental study on CO2 sequestration in deep coal seams of Ningxia, China, reveals that element migration is minimal and pore structure evolves favorably for CO2 adsorption after supercritical CO2 treatment. Potentially harmful element release is extremely low, indicating high safety for CO2 storage. The findings provide scientific evidence for CCUS deployment.
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
日本のCCS事業（苫小牧等）は地質条件が異なるものの、CO2貯留層の安全評価手法（元素移動・孔隙構造分析）は参考になる。国内ではCCS法制整備が進んでおり、貯留適地評価への応用が期待される。
In the global GX context
This study provides empirical evidence on CO2 storage in unmineable coal seams, contributing to global CCS knowledge. It underscores the importance of site-specific geochemical and pore-structure assessments, which are relevant for international CCS projects under the Paris Agreement.
👥 読者別の含意
🔬研究者:Provides experimental datasets on scCO2-water-coal interactions and pore evolution, useful for CCS reservoir modeling.
🏛政策担当者:Supports evidence-based site selection and safety assessment for CCS deployment, informing regulatory frameworks.
📄 Abstract（原文）
With the intensification of global climate change, reducing greenhouse gas emissions has become a global challenge. As a high-emission region, Ningxia faces significant pressure to reduce emissions. Geological storage of carbon dioxide is considered one of the key technologies for achieving carbon neutrality. Utilizing deep unmineable coal seams for CO2 sequestration can not only reduce greenhouse gas emissions but also increase the recovery rate of coalbed methane. However, the microscale interaction mechanisms between supercritical CO2(scCO2) and coal seams in this region are not yet fully understood. Therefore, this study selected the No. 6 coal seam of the Jurassic Yan'an Formation in Ningxia as the research object and conducted scCO2-water-coal simulation experiments using a high-temperature and high-pressure thermosimulation reactor. The experiments were set at 40°C and 9MPa to simulate a geological environment at a depth of 1000 meters. The simulation experiments were divided into four groups with durations of 1, 3, 5, and 7 days. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP-OES) were used to analyze the elemental migration characteristics of the reaction solution and solid samples. Low-temperature N2 and CO2 gas adsorption methods were employed to study the evolution characteristics of pore structures. The experimental results showed that the main elements in the reaction solution were Ca, Na, and Mg. Additionally, 14 trace elements were detected, with concentrations being relatively low. Among them, Cr, Pb, Cu, Zn, and Ti were detected in the reaction solution, but their concentrations were all below 3 ppm. Analysis of elemental migration rates indicated that Mo, Nb, V, Cu, Rb, Pb, and Zn had high migration rates (average migration rates > ±50%), while Be, Co, and Y had migration rates below 10%. Low-temperature gas adsorption experiments revealed that after scCO2 treatment, the micropores in coal samples significantly increased, mesopores (1-50 nm) decreased, and macropores (>50 nm) slightly increased. This suggests that the microporous structure of coal seams was enhanced after scCO2 treatment, which is conducive to the adsorption and sequestration of CO2. Moreover, the release of potentially harmful elements was extremely low, indicating high safety for this region as a CO2 sequestration site. This research provides important scientific evidence and technical support for CO2 geological storage in Ningxia and even nationwide.
🔗 Provenance — このレコードを発見したソース
- EarthArXiv https://eartharxiv.org/repository/object/14224/download/24862/first seen 2026-08-02 04:24:13
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