Article
Energy & Fuels
Haidong Wang, Zhiheng Cheng, Quanle Zou, Zhenhua Li, Fulong Sun, Hongwei Yang, Yun Lei
Summary: The proper understanding and utilization of liquid CO2 phase transition fracturing technology is crucial for reducing CO2 emissions and increasing coalbed methane production. By implementing this technology in outburst-prone coal seams, it is possible to improve gas extraction speed, increase gas permeability, and effectively suppress coal seam outbursts.
Article
Green & Sustainable Science & Technology
Feng Zhang
Summary: The geological structures of coal fields in China are complex. With an increase in mining depth, the coal seams exhibit high gas and low permeability characteristics, which intensify the potential for coal and gas outbursts during mining. Gas drainage is a primary measure used to prevent and control gas disasters, and improving coal seam permeability is crucial. This study investigated the technology of liquid CO2 phase-transition fracturing in coal seams. Field tests at Baode Coal Mine showed positive results, with a significant increase in drainage effect, gas-drainage concentration, and permeability coefficient.
Article
Chemistry, Multidisciplinary
Shakil A. Masum, Sivachidambaram Sadasivam, Min Chen, Hywel R. Thomas
Summary: This study aims to improve the understanding of low and subcritical CO2 adsorption-desorption behavior of bituminous coals and evaluate the potential for CO2 storage in shallow-depth coal seams. The research conducted manometric sorption experiments on coal cores obtained from a 30 m deep coal seam in Poland and found that adsorption capacities correlated with void volume and equilibrium time. Hysteresis behavior indicated CO2 pore diffusion and condensation, which is vital for assessing low-pressure CO2 injection and storage capabilities of shallow coal seams.
Article
Environmental Sciences
Ioannis Vrouhakis, Evangelos Tziritis, Andreas Panagopoulos, Georgios Stamatis
Summary: A combined hydrogeochemical and hydrodynamic assessment was conducted in a highly productive agricultural basin in central Greece, revealing the progressive impact of secondary phenomena on groundwater chemistry. Various tools and methods were applied to a comprehensive dataset, with results highlighting the importance of joint tools/methods application in scientific tasks and providing valuable information for sustainable groundwater management.
Article
Engineering, Chemical
Ran Yang, Shilin Liu, Haitao Wang, Zengmin Lun, Xia Zhou, Chunpeng Zhao, Chungang Min, Han Zhang, Yi Xu, Dengfeng Zhang
Summary: The presence of H2O in coal influences the adsorption of CO2 and CH4, with coal containing oxygenic functional groups and mesopores being positively correlated with H2O. The impact of H2O on CO2 adsorption depends on its dissolution capability and competitive adsorption. Injecting CO2 promotes desorption of adsorbed CH4 from coal, with a lower CO2 adsorption amount at equilibrium state for displacement at equilibrium pressures below 3 MPa.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Sivachidambaram Sadasivam, Shakil Masum, Min Chen, Kamil Stanczyk, Hywel Thomas
Summary: This study explores the CO2 adsorption-desorption kinetics of bituminous coal under low pressure injection and compares different models to fit the data. The results suggest that bulk pore diffusion, surface interaction, and multilayer adsorption are the rate-determining steps.
Article
Geosciences, Multidisciplinary
Geng Li, Yong Qin, Xuejuan Song, Boyang Wang, Haipeng Yao, Yabing Lin
Summary: This study analyzed the natural gas characteristics of multi-thin coal seams by examining the desorbed gas from different layers of Well A in Hailar Basin. The results showed an increase in heavy hydrocarbon content with depth. Isotope values of methane carbon and ethane carbon became heavier downwards, while the delta13C values did not change significantly. Well-developed sandstone pore and fracture systems facilitated the migration of methanogenic micro-organisms to coal seams, making the production of biogenic gas easier under these geological conditions.
FRONTIERS OF EARTH SCIENCE
(2023)
Review
Energy & Fuels
Chao Xu, Tong Yang, Kai Wang, Qiang Fu, Shihao Ma
Summary: Coalbed methane is a low-carbon and clean energy source, but also a dangerous gas that threatens mine safety. Understanding the development of fractures and gas migration in the coal seam's overlying strata is essential for accurate extraction. Various methods, such as roadway, borehole drilling, and surface drilling, are used for gas extraction in the fractured zone.
Article
Thermodynamics
Chaolin Zhang, Enyuan Wang, Bobo Li, Xiangguo Kong, Jiang Xu, Shoujian Peng, Yuexia Chen
Summary: CO2-ECBM recovery has the triple benefits of recovering clean resources, ensuring coal mine safety, and achieving CO2 geological sequestration. The study reveals that during CO2-ECBM recovery, the reservoir pressure remains high, methane recovery efficiency increases, but CO2 sequestration efficiency decreases with increasing injection pressure. A displacement index is proposed to reflect the synergistic effect of methane recovery and CO2 sequestration, and a dynamic pressure injection mode is suggested to enhance recovery and sequestration efficiency.
Article
Microbiology
Bronwyn C. Campbell, Se Gong, Paul Greenfield, David J. Midgley, Ian T. Paulsen, Simon C. George
Summary: This study investigated the metabolic roles of microbial communities in coal biodegradation to methane by incubating a community from a coal seam in Australia with 10 different aromatic organic compounds. Changes in the community in response to these aromatic carbon substrates were revealed through 16S rRNA sequencing, and abundant taxa and their catabolic roles were identified. The study is the first to link specific coal seam taxa to aromatic substrates and propose conceptual models of their degradation pathways.
FEMS MICROBIOLOGY ECOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Hu Wen, Jianchi Hao, Li Ma, Xuezhao Zheng
Summary: The study revealed that the process of CO2 replacing CH4 can be divided into different stages, with desorption amount varying with time and temperature, and replacement ratio showing a positive correlation with replacement time. Overall, an increase in CO2 injection pressure would result in higher cumulative displacement ratio.
Article
Mining & Mineral Processing
Qingyi Tu, Yuanping Cheng, Sheng Xue, Ting Ren, Xiang Cheng
Summary: The research investigated the crushing work ratios and gas desorption properties of intact coal, concluding that high levels of transport work and gas are needed for crushing intact coal, exceeding the transport work significantly. The study also found that the required minimum stress for crushing intact coal exceeds the in-situ stresses available at mining depths of 300-700 meters.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Zhongbei Li, Ting Ren, Dennis Black, Ming Qiao, Itmam Abedin, Jessica Juric, Mike Wang
Summary: This study investigates the in-situ gas content and gas sorption capacity of a representative coal seam in the Sydney basin. The results show variations in gas content and sorption capacity among different sections, and reveal some correlations. The insights derived from this study are important for developing effective gas management strategies and improving the safety and efficiency of coal mining operations.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Bruno G. Neininger, Bryce F. J. Kelly, Jorg M. Hacker, Xinyi Lu, Stefan Schwietzke
Summary: Coal seam gas (CSG) accounts for a significant portion of natural gas production in Australia, and this study in the Surat Basin reveals that CSG methane emissions per unit of gas production are higher than previously estimated, indicating a need for further review and refinement of existing emission inventories. Prioritizing TD verification surveys could enhance global characterization of methane emissions.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Liang Cheng, Jiang Xu, Shoujian Peng, Lei Qin, Fazhi Yan, Yang Bai, Bin Zhou
Summary: Coal-and-gas outburst (CGO) is a major challenge in coal mining, and the initial gas pressure has a significant influence on the flow characteristics of CGO airflow. The study found that the gas pressure decreases periodically or continuously during the CGO process, and the static pressure in the roadway shows alternating positive-negative pressure transition. The increase in coal seam initial gas pressure leads to higher velocity and longer duration of high-speed airflow in the roadway.
NATURAL RESOURCES RESEARCH
(2022)
Article
Geology
Tim A. Moore, Ofentse M. Moroeng, Jian Shen, Joan S. Esterle, Roman C. Pausch
Summary: Organic petrography and isotopic analyses were used to interpret regional tectonics and paleoclimate in a study of lignite in the Lower Cretaceous Yimin Formation in Inner Mongolia, China. The study revealed seasonal precipitation and long-term dry periods under globally warm temperatures, with fire playing an important role in the mire ecology.
CRETACEOUS RESEARCH
(2021)
Article
Plant Sciences
Alexander Wheeler, Patrick T. Moss, Annette E. Goetz, Joan S. Esterle, Daniel Mantle
Summary: The study compared the efficacy of acid-free processing and standard processing techniques on Permian material, finding that both methods yielded comparable assemblages of palynomorphs, with higher proportions of phytoclasts in the acid-free samples. Additional refinement of the acid-free technique and further research are recommended to improve accuracy and remove phytodasts.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2021)
Article
Energy & Fuels
Julie K. Pearce, Grant K. W. Dawson, Silvano Sommacal, Suzanne D. Golding
Summary: Carbon dioxide geological storage involves injecting captured CO2 streams into a suitable reservoir. Mineral trapping of CO2 in carbonate minerals is considered a secure form of trapping, and co-injection of CO2 with water may enhance the trapping mechanisms. Produced waters can be re-injected into reservoirs to provide a source of cations for enhancing mineral trapping, as observed in experimental reactions with sandstone samples.
Article
Energy & Fuels
K. A. Baublys, H. Hofmann, J. S. Esterle, D. Cendon, S. Vink, S. D. Golding
Summary: Hydrochemical data responds slowly to changes in groundwater conditions compared to hydraulic pressure, providing insights into groundwater flow paths. Understanding fluid-rock and microbial interactions in low rank coal measures with biogenic gas is crucial for determining groundwater composition distribution. A process-based approach using tracer and hydrochemical data in coal seam gas production wells in the Walloon Subgroup of the Surat Basin, Australia, helps identify geochemical processes influencing groundwater composition and flow.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Energy & Fuels
Victor M. Sepulveda-Castaneda, Joan S. Esterle, Suzanne D. Golding, Sebastian Gonzalez
Summary: Coal bed methane (CBM) production in the Cesar Sub-basin of Colombia has been studied to determine the origin of the gas, with a focus on whether it is thermogenic, biogenic, or a mixture of both. Analyzing water and gas samples from CBM production wells and aquifers showed that biogenesis is the main gas origin, with structural compartmentalization influencing gas content and coal ranks. Isotopic and geochemical analysis supported the presence of biogenic gas and confirmed the occurrence of methanogenesis in the study area.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
J. K. Pearce, G. W. Dawson, S. D. Golding, G. Southam, D. J. Paterson, F. Brink, J. R. Underschultz
Summary: The feasibility of industrial-scale CO2 geological storage in the Jurassic Precipice Sandstone of the southern Surat Basin, Queensland, Australia is being studied. The Precipice Sandstone reservoir is suitable for storage, with mineral trapping mainly occurring in the overlying Evergreen Formation and in interbedded mudstones.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
J. K. Pearce, C. Khan, S. D. Golding, V Rudolph, J. R. Underschultz
Summary: The traditional method of geological CO2 storage involves injecting CO2 into a high permeability reservoir capped by a low permeability seal. Another method involves injecting CO2 dissolved in water, which can enhance storage security. Geochemical modeling on different reservoir rocks indicated the potential for both mineral trapping and dissolution trapping of CO2 over time.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geology
Shaojie Li, Xuan-Ce Wang, Si-Yu Hu, Paul Guagliardo, Matt Kilburn, Suzanne D. Golding, Sandra Rodrigues, Julien Bourdet
Summary: The Paleoproterozoic hydrothermal system in the southern McArthur Basin in northern Australia played a crucial role in the formation of the world-class McArthur River Zn-Pb deposit. The study examined the geochemistry of fine-grained pyrite and solid bitumen in the Barney Creek Formation to investigate potential hydrothermal activities in the region. The results showed similarities between the studied samples and the McArthur River deposit, indicating the presence of hydrothermal fluid flow and suggesting the importance of other factors, such as fluid migration conduits, in mineralization.
ORE GEOLOGY REVIEWS
(2022)
Article
Energy & Fuels
J. K. Pearce, G. W. Dawson, G. Southam, D. Paterson, D. Kirste, S. D. Golding
Summary: Characterizing the metals in minerals of drill cores from a storage site can provide insights into the potential risks of water quality changes and the mobilization and fate of environmentally regulated metals in CO2 storage complexes globally.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Luc G. Turner, Grant K. W. Dawson, Suzanne D. Golding, Julie K. Pearce
Summary: Geological storage of CO2 is crucial for achieving the energy transition to net zero emissions. However, the behavior of NOx and its impact on reservoir rock during CO2 storage has been little studied. Experimental reactions show that NOx can affect the pH and induce rock reactions and precipitation when dissolved in CO2. Further studies are needed to understand the reaction mechanisms in different rock types, gas mixtures, and storage conditions, which is important for industrial CO2 storage and other renewable energy storage technologies.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Energy & Fuels
Xiaoxiao Mao, Sandra Rodrigues, Joan S. Esterle, Suzanne D. Golding
Summary: Open file data and new laboratory data were integrated to interpret reservoir properties of the Toolebuc Formation. The formation is divided into an upward deepening cycle (UDC) followed by an upward shallowing cycle (USC), with different lithofacies present. Facies 1 is clay and silica-rich with low TOC, Facies 2 has mixed mineralogical composition with high TOC, and Facies 3 is enriched in carbonates. The lithofacies stacking pattern corresponds to changes in GR response, TOC, Brittleness Index (BI), and clay content.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Energy & Fuels
J. K. Pearce, H. Hofmann, K. Baublys, S. D. Golding, I. Rodger, P. Hayes
Summary: Understanding the occurrence and sources of methane in aquifers is crucial, especially in areas with oil and gas reservoirs. Multi-isotopic studies play a vital role in understanding the sources and concentrations of dissolved gases in aquifers, which are important for future energy storage and utilization. The Great Artesian Basin in Australia, specifically the Precipice and Hutton sandstones in the Surat Basin, serves as a significant water resource but also hosts gas extraction and potential CO2 storage sites, making it essential to comprehend the gas concentrations, processes, and sources for effective management.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Environmental Sciences
J. K. Pearce, S. D. Golding, K. Baublys, H. Hofmann, G. Gargiulo, S. J. Herbert, P. Hayes
Summary: This study aimed to differentiate biogenic methane in aquifers overlying coal seam gas (CSG) reservoirs and the alluvium using a multi-isotopic approach. It found that most aquifer and alluvium samples were consistent with in situ methane production, not migration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
J. K. Pearce, G. W. Dawson, F. Brink, G. Southam, D. Paterson, N. Hall, R. Heath, D. Greer, D. Kirste, S. D. Golding
Summary: CO2 geological storage is a potential solution for reducing carbon emissions. It is important to understand the geochemical processes involved in CO2 storage to minimize risks. This study analyzed drill cores from a proposed CO2 storage site and identified elevated levels of certain elements in the underlying formation. The research also demonstrated how different mineral contents can result in the release of different elements. The findings have implications for CO2 storage sites and potential indicators of leakage in drinking water aquifers. They are also relevant to subsurface energy storage in various forms.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Chawarwan Khan, Julie K. Pearce, Suzanne D. Golding, Victor Rudolph, Jim R. Underschultz
Summary: The study examines the potential of using CO2 dissolved in water injection as a method to mitigate the risk of geological storage, combined with the possibility of piggybacking off the existing wastewater injection industry as a novel carbon storage option, to reduce costs.