Article
Green & Sustainable Science & Technology
Baoxin Zhang, Xuehai Fu, Yibing Wang, Zeyu Lin, Longjiang Fan, Fanhua Bill Zeng
Summary: This study analyzes the geochemical compositions of coalbed methane (CBM) and groundwater in the western Fukang area of the Southern Junggar Basin in China. It discovers that determining the genesis of CBM in mixed genesis gas (MGG) areas cannot rely on a single component. The study also proposes a novel approach for predicting CBM production based on geochemical compositions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Rui-Yue Yang, Gen-Sheng Li, Xiao-Zhou Qin, Zhong-Wei Huang, Jing-Bin Li, Mao Sheng, Bin Wang
Summary: This paper investigates the mechanisms and efficacy of radial borehole fracturing in increasing CBM production in multiple layers. The study establishes a three-dimensional fracture network model and examines the advantages of targeted stimulation for radial borehole fracturing. Field wells in eastern Yunnan-western Guizhou, China are presented to illustrate the stimulation efficiency. The results show that radial borehole fracturing achieves higher production rates compared to vertical well fracturing. Therefore, radial borehole fracturing holds significant potential for the development of CBM and coal-measure gas in multiple layers.
Article
Geosciences, Multidisciplinary
Zhengguang Zhang, Yong Qin, Zhaobiao Yang, Geng Li, Zhenjiang You
Summary: This study conducts a comprehensive analysis of the productivity of coalbed methane (CBM) wells using geological and production data from 19 wells. The results show that the productivity is influenced by factors such as the proportion of coal type, the ratio of critical desorption pressure to reservoir pressure, gas saturation, permeability before and after stimulation, burial depth of the coal seam floor, and span of the co-production coal seam. To achieve commercial development of CBM wells, certain thresholds for these factors need to be met.
NATURAL RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Abir Banerjee, Rima Chatterjee
Summary: The methodology developed for prospect identification in coalbed methane reservoirs involves establishing regression models to identify potential coal seams based on laboratory core sample analysis. Gas saturation and coal content can be estimated from organic content, and sweet spots for future well locations can be identified through overlaying seam thickness and gas content mapping. The study also demonstrates electro-facies classification using multi-resolution clustering architecture to capture texture parameters from resistivity image logs, aiding in lithology determination and production optimization in the Bokaro CBM reservoir in India.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Qixian Li, Jiang Xu, Shoujian Peng, Fazhi Yan, Bin Zhou, Ende Han, Cheng Jiang
Summary: Coalbed methane co-production technique was explored in this study, revealing the pressure equilibrium and gas flow between different coal reservoirs. The study further demonstrated the dynamic supply state in coalbed methane production, enabling effective management and optimization of production efficiency.
NATURAL RESOURCES RESEARCH
(2021)
Article
Multidisciplinary Sciences
R. L. Tyne, P. H. Barry, M. Lawson, D. J. Byrne, O. Warr, H. Xie, D. J. Hillegonds, M. Formolo, Z. M. Summers, B. Skinner, J. M. Eiler, C. J. Ballentine
Summary: Carbon capture and storage (CCS) is a crucial technology for mitigating the environmental impact of CO2 emissions, requiring an understanding of trapping and storage mechanisms for safe sequestration. Research in a CO2-EOR project suggests microbial methanogenesis may convert CO2 to CH4, potentially serving as a significant global subsurface sink for CO2.
Article
Energy & Fuels
Sijian Zheng, Yanbin Yao, Shuxun Sang, Dameng Liu, Meng Wang, Shiqi Liu
Summary: This study investigates the dynamic characteristics of multiphase methane in CO2-ECBM through the use of self-designed nuclear magnetic resonance measurement. The results show that the injection of CO2 improves the desorption efficiency of adsorbed methane. The CO2-CH4 displacement rates vary in different stages, and a low concentration ratio of CH4/CO2 significantly enhances methane recovery.
Article
Energy & Fuels
Jun-Tai Shi, Yan-Ran Jia, Long-Long Zhang, Chang-Jiang Ji, Guo-Fu Li, Xian-Yue Xiong, Hong-Xing Huang, Xiang-Fang Li, Sui-An Zhang
Summary: This study establishes a generalized material balance equation (GMBE) and proposes a straight-line reserve evaluation method for shale gas reservoirs and coalbed methane (CBM) reservoirs. The GMBE considers various factors affecting the reservoirs, and the straight-line method provides a quick and accurate calculation of different reserves. The proposed approach is proven to be rational, accurate, and advantageous compared to other existing methods.
Article
Multidisciplinary Sciences
Mohammad Asif, Lei Wang, D. C. Panigrahi, Keka Ojha, Randy Hazlett
Summary: The primary and secondary recovery of coalbed methane (CBM) were studied in this paper. The adsorption isotherm of CH4 was used to analyze the primary recovery, while the CO2-ECBM process was simulated for the secondary recovery. The results showed that the CO2-ECBM process could enhance gas recovery. A 3D coalbed model was constructed to demonstrate the potential of this technique. The study found that coalbed reservoirs can economically implement the CO2-ECBM technology.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Environmental
Elliott P. Barnhart, Leslie F. Ruppert, Randy Hiebert, Heidi J. Smith, Hannah D. Schweitzer, Arthur C. Clark, Edwin P. Weeks, William H. Orem, Matthew S. Varonka, George Platt, Jenna L. Shelton, Katherine J. Davis, Robert J. Hyatt, Jennifer C. McIntosh, Kilian Ashley, Shuhei Ono, Anna M. Martini, Keith C. Hackley, Robin Gerlach, Lee Spangler, Adrienne J. Phillips, Mark Barry, Alfred B. Cunningham, Matthew W. Fields
Summary: Research has found that complex carbon-containing nutrients can stimulate methane production in coal beds, which has significant implications for understanding biogenic methane production and the formation of methane from underground carbon.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Dameng Liu, Yanbin Yao, Yanhai Chang
Summary: Evaluation of free and adsorption gas in the in-situ reservoir is important for coalbed methane exploration and production. Current methods for estimating the adsorbed gas content have limitations due to unreasonable or questionable mathematical assumptions. This study proposes a method using NMR and excess isothermal adsorption experiments to accurately quantify free and adsorbed methane in the reservoir.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Xiao Feng, Zizhong Zhang, Hongguang Guo, Zhigang Li, Zaixing Huang, Michael Urynowicz
Summary: Supercritical CO2 (ScCO2) extraction can enhance the bioavailability of coal for biogenic methane production. The study investigated the impact of prolonged ScCO2 extraction on methane yield, as in-situ ScCO2 injection is time-consuming. Results showed that longer extraction time and higher extraction yield decreased the enhancement of biomethane production. A conceptual model of ScCO2-MECBM was proposed for enhancing methane recovery in-situ.
JOURNAL OF SUPERCRITICAL FLUIDS
(2023)
Article
Energy & Fuels
Wendong Wang, Chengwei Wang, Yuliang Su, Yang Zhao, Jiayi Wen, Lei Li, Yongmao Hao
Summary: CO2 storage is an important technique for achieving carbon peak and carbon neutralization, and depleted gas reservoirs are potential candidates for geological CO2 storage. High water-bearing wells in volcanic depleted gas reservoirs can be selected for CO2 storage. The gas-water distribution characteristics of the gas reservoir after CO2 injection are evaluated and the CO2 injection timing and volume are optimized. Typical wells have been selected for CO2 storage based on the research results.
Review
Energy & Fuels
Wancheng Zhu, Shuyuan Liu, Xiufeng Zhang, Chenhui Wei
Summary: This paper provides a comprehensive review of the mechanisms and properties of gas adsorption in coal, the geomechanical behavior of coal, and the mechanisms of gas transport in coal. It also discusses several waterless fracturing techniques for improving coalbed permeability and identifies current knowledge and research gaps.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Chemical
Jizhao Xu, Hexiang Xu, Cheng Zhai, Yuzhou Cong, Shuxun Sang, P. G. Ranjith, Quangui Li, Xiong Ding, Yong Sun, Yongshuai Lai
Summary: Low-field nuclear magnetic resonance (NMR) is used to analyze pore-size distributions in reservoirs, but the calculation of surface relaxivity (p) using conventional NMR methods is time-consuming and expensive. This study proposes an NMR grain packing method for rapid measurement of p values of unconsolidated coal cuttings. Different coal grain sizes exhibit different relaxation responses, influenced by grain packing patterns, grain morphology, water film distribution, and soluble minerals. The results show that macropores contribute significantly to porosity, and different models yield different p values for coal samples.
Article
Geosciences, Multidisciplinary
J. Roeth, A. Baniasad, F. Froidl, J. Ostlender, C. Boreham, L. Hall, R. Littke
Summary: This study examines the petroleum generation potential of the Birkhead and Murta formations in the Eromanga Basin in Australia. The analysis shows that both formations have good organic content and hydrocarbon potential, with the Murta formation exhibiting higher potential. Additionally, there are differences in the type and distribution of organic matter between the two formations.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Energy & Fuels
Tianyu Zheng, Sebastian Grohmann, Arysthasya Arysanto, Alireza Baniasad, Qian Zhang, Ralf Littke
Summary: This study presents a novel method to investigate primary migration in petroleum source rocks using hydrous pyrolysis. The experiment was conducted on the Upper Devonian-Lower Mississippian Woodford Shale, which contains organic carbon-rich, type II kerogen. By heating the source rock samples at different temperatures, maceral characteristics were observed before and after pyrolysis. Results showed in situ maceral changes at different maturities, with Tasmanites exhibiting strong yellow fluorescence and Liptodetrinite losing fluorescence intensity at higher temperatures.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Energy & Fuels
Wei Wei, Ralf Littke, Rudy Swennen
Summary: The Variscan foreland basin in Belgium and the Netherlands has potential targets for shale gas exploration based on the composition and deposition conditions of the sedimentary rocks. The area near the Variscan mountains has higher potential for gas generation and storage, while areas further away have limited potential.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Chemistry, Physical
Zaid Jangda, Hannah Menke, Andreas Busch, Sebastian Geiger, Tom Bultreys, Helen Lewis, Kamaljit Singh
Summary: This study investigates the pore-scale displacement processes in H-2-brine systems in a porous sandstone. The findings suggest that underground H-2 storage may be a suitable strategy for energy storage, but further research is needed to fully understand the pore-scale interactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Review
Geosciences, Multidisciplinary
Alireza Baniasad, Ralf Littke, Qusay Abeed
Summary: This study presents the results of an integrated geochemical study of oils in Jurassic - Cenozoic reservoirs in the eastern region of the Arabian Plate. The main objective was to analyze the regional-scale petroleum systems across the study area, covering NE Iraq to SE Oman and the entire Persian Gulf. The dataset included over 500 crude oil samples from 112 oil fields and 11 different reservoir units, and the results provided insights into the geological factors controlling the oil fields in the eastern Arabian Plate.
JOURNAL OF PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
S. Grohmann, R. Littke, I. Abu-Mahfouz, G. Gaus, J. Klaver, N. Thuens, P. Schulte, T. Patzek, V. Vahrenkamp
Summary: This study provides a detailed investigation of the geochemical and petrographic characteristics of Upper Cretaceous Jordan Oil Shale (JOS). The JOS contains high amounts of organic matter, carbonates, and variable biogenic SiO2. The organic matter shows oil-prone characteristics, and the JOS is similar to other organic-rich rocks in the Eastern Mediterranean. The preservation of organic matter in the JOS was influenced by Late Cretaceous upwelling events and oxygen depletion in isolated sub-basins. The JOS has the potential for oil shale retorting due to its significant hydrocarbon content.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geology
Andreas Busch, Suzanne Hangx, Stephanie Vialle, Roberto Emanuele Rizzo, Niko Kampman
Summary: The long-term interaction of CO2-charged fluids with low permeability cap rocks is important for seal integrity assessment. A study on a natural CO2 analogue near Green River, Utah, USA, showed that over time and small distances, mechanical weakening of the cap rock due to fluid-rock interactions can occur, leading to loss of cohesion, compaction, and formation of fractures. However, considering the thickness of cap rocks above CO2 storage reservoirs, the risk of losing containment integrity over hundreds to thousands of years is not significant.
Article
Energy & Fuels
Zhongrui Wu, Ralf Littke, Alireza Baniasad, Zhi Yang, Zhenxing Tang, Sebastian Grohmann
Summary: The Upper Cretaceous Qingshankou Formation in the Songliao Basin, NE China contains quality petroleum source rocks and serves as a valuable record for studying water column depositional conditions and climatic change. This study focuses on the first Member of the Qingshankou Formation (K2qn1) in the south central depression, analyzing various data to identify different types of lacustrine source rocks and organic-rich layers within the unit. The results provide insights into the organic composition and deposition conditions of the studied rocks. Overall, the importance of this research is rated as 7 out of 10.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Energy & Fuels
Linda Burnaz, Laura Zieger, Joyce Schmatz, Anastasia Escallon Botero, Sebastian Amberg, Nicolai Thuens, Ralf Littke
Summary: Microscopic petrographic analysis of fine-grained sediments requires standardised, high-quality preparation of polished sections. This study evaluates the effect of alternative preparation techniques on the reliability and consistency of vitrinite reflectance data measured on shales. The results show that oil-based lubricant led to similar reflectance values compared to traditional water-based grinding and polishing, while BIB polishing increased vitrinite reflectance systematically.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Bing Wang, Nansheng Qiu, Ralf Littke, Sebastian Amberg, Zhengdong Liu
Summary: This study explores the relationship between structural evolution and petroleum system development in the eastern Kuqa Depression. Structural restoration and petroleum system modeling reveal the significant influence of tectonics on hydrocarbon accumulations, with traps in the Dina Fold Belt and Dibei Slope identified as prospective targets.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Biodiversity Conservation
Ziba Zamani, Hossain Rahimpour-Bonab, Ralf Littke
Summary: The Qadir coal-bearing member of the Rhaetian Nayband Formation in the Parvadeh coal mine, East-Central Iran, was studied to predict coal properties. The studies revealed a river-dominated, storm- and wave-influenced coastal/delta plain setting that accumulated along the shallow marine environment. The sedimentary pattern was mainly influenced by tectonic events in a post-orogenic foreland setting. The coal seams in the lower delta plain environment had detrital sources and a high ash content.
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
(2023)
Article
Energy & Fuels
Amirsaman Rezaeyan, Niko Kampman, Vitaliy Pipich, Lester C. Barnsley, Gernot Rother, Clayton Magill, Jingsheng Ma, Andreas Busch
Summary: The pore structure of mudrocks plays a vital role in evaluating flow behavior, and the relationship between porosity evolution and flow and transport in mudrocks remains insufficiently understood. Organic-rich mudrocks mainly contain large pores, which favor production from unconventional reservoirs. The research findings are of great significance for understanding fluid imbibition and flow properties in mudrocks.
Article
Geosciences, Multidisciplinary
Paula Sofia Gonzalez Samano, Roger Daniel Beckie, Andreas Busch, Aaron Graham Cahill
Summary: Oil and gas wells can experience integrity failure, leading to the release of fugitive gas into the subsurface and atmosphere. This study focuses on understanding the factors influencing fugitive gas migration in the shallow sedimentary rocks of British Columbia, Canada, and developing methods to detect and monitor these gases. Laboratory techniques and analytical calculations were used to characterize flow properties of rock cores and assess the relationship between petrophysical characteristics and flow propensity. Results indicate that capillary pressure and heterogeneity play significant roles in controlling gas migration in the region.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Instruments & Instrumentation
Nick Harpers, Ming Wen, Paul Miller, Suzanne Hangx, Andreas Busch
Summary: This study introduces the Harpers THMC Flow Bench, a multi-cell, flow-through reactor system for the scientific analysis of coupled thermo-hydro-mechanical-chemical processes in rocks. The setup allows long-term testing on rock samples and includes features such as high pressure and axial load capacity, temperature control, and fluid mixing capabilities. Various tests, including permeability measurements, chemical analysis, and mechanical testing, can be performed using the setup.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Geology
Andreas Busch, Suzanne Hangx, Stephanie Vialle, Roberto Emanuele Rizzo, Niko Kampman
Summary: This study investigates the long-term geomechanical changes in a reservoir seal due to fluid-rock interactions with CO2-charged fluids. The study finds that low permeability cap rock undergoes mechanical weakening over time, resulting in the formation of bedding-parallel fractures. However, these mechanical weakening processes only occur over long time scales and small distances, suggesting that the threat to containment integrity is not considerable.