Article
Geochemistry & Geophysics
Xiaoqiang Li, Juske Horita
Summary: The phenomenon of laboratory pyrolysis experiments producing wetter gases than those in natural reservoirs has long been recognized and debated in the investigation of natural gases in sedimentary basins. This study compares the pyrolysis of Woodford Shale with previous results from the Arkoma Basin to explore the discrepancy. The analysis of gas and isotopic compositions suggests that the generation of light hydrocarbons involves uni-directional cracking reactions, exchange reactions with water, and reversible reactions among light hydrocarbons and other H-containing volatiles. The findings highlight the importance of compound-specific and position-specific isotope analysis in understanding geological and biodegradation processes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Multidisciplinary Sciences
Stefan Ladage, Martin Blumenberg, Dieter Franke, Andreas Bahr, Ruediger Lutz, Sandro Schmidt
Summary: Methane emissions along the natural gas supply chain play a critical role in the climate benefits of switching from coal to natural gas in the power sector. For Germany, with methane leakage rates below specific break-even levels, transitioning to natural gas can significantly reduce CO2-equivalent GHG emissions.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Shaojie Li, Xiaowen Guo, LunJu Zheng
Summary: Hydrous pyrolysis experiments were conducted to study the carbon-hydrogen isotopic systematics of hydrocarbon gas. The presence of formation water affected the isotopic ratios of methane, ethane, and propane in the gas. The isotopic ratios increased with thermal maturity and showed quadratic correlations with vitrinite reflectance values. Supercritical water did not significantly affect the isotopic partitioning behavior. Partial isotopic reversals were observed during the oil and gas generation stages, likely due to gas mixing.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Yunyan Ni, Dazhong Dong, Limiao Yao, Jianping Chen, Xing Liang, Fei Liu, Jian Li, Jinhao Guo, Jinliang Gao
Summary: This study analyzed gases from shale gas fields in the southern Sichuan Basin to investigate their geochemical characteristics and origins. The gases belonged to shale gas from the Upper Ordovician-Lower Silurian shale and were dominated by methane. The isotopic compositions of carbon indicated high thermal maturity and contributions from organic matter. The study found a complete carbon isotopic reversal trend and highlighted the importance of understanding the geochemical characteristics of shale gases for future exploration.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Maria Naumenko-Dezes, Wolfram Kloppmann, Michaela Blessing, Raphael Bondu, Eric C. Gaucher, Bernhard Mayer
Summary: This article presents a study that reveals a previously overlooked source of natural gas in shale formations, which is generated by radiolysis of organic matter. The study shows that radiolytic gas can account for a significant portion of natural gas mixtures in major shale gas plays worldwide. Considering radiolytic gas as an additional component in uranium-bearing shale gas formations can lead to a more accurate determination of the origins of natural gas.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Energy & Fuels
Qiong Wang, Hao Xu, Dazhen Tang, Pengfei Ren
Summary: This study investigates the composition and formation mechanisms of coalbed gas (CBG) in the Miquan and Fukang areas of the southern Junggar Basin. It is found that there are significant differences in the CBG composition between the two areas. The CBG in the Fukang area is mainly methane, while the CBG in the Miquan area has a high CO2 concentration. The production pathways of biogas also differ between the two areas, with the Fukang area mainly using the CO2 reduction pathway and the Miquan area mainly using the acetic acid/methyl fermentation pathway. This study clarifies the fate of CO2 in the Miquan area and highlights the influence of exogenous CO2 on microbial methanogenic pathways.
Article
Energy & Fuels
Li Jian, Tian Jixian, Liu Chenglin, Feng Dehao, Zeng Xu, Zhang Mai, Guo Zeqing, Kong Hua, Rizwan Sarwar Awan, Li Zhijie, Yang Sai
Summary: This study analyzed the geochemical characteristics and sources of natural gas in the western Qaidam Basin using isotopes and gas composition. The natural gas in this region consists mainly of hydrocarbon gases, with high dryness coefficient, heavy carbon isotopes, and high thermal maturity. The main gas source rocks in the western Qaidam Basin are identified as lower Ganchaigou (E-3), upper Ganchaigou (N-1), and lower Youshashan formations (N-2(1)).
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Guangbo Chen, Tan Li, Guohua Zhang, Pengcheng Teng, Bin Gong
Summary: This study explored the distribution law of energy in coal-rock system by analyzing the mechanical characteristics of coal-rock combined body, demonstrating that components of greater hardness difference are more prone to rock burst. Before destruction, energy mainly accumulates on the weaker component while the harder components act as clamping devices.
Review
Green & Sustainable Science & Technology
Corey Young
Summary: While previous studies have focused on the impact of unconventional natural gas development in the US, this paper provides a synthesis of the local governance challenges faced by communities. Through an integrative literature review, the author identifies regulatory confusion, information asymmetries, and conflicting interests as key obstacles for local governments. The paper suggests collaborative frameworks as a solution to address these challenges and provides insights for future industries or resources with local impacts.
Article
Geosciences, Multidisciplinary
Shaojie Li, Xiaowen Guo, LunJu Zheng
Summary: Hydrous pyrolysis experiments using formation water instead of distilled water demonstrated that the presence of formation water facilitates oil generation and promotes hydrocarbon expulsion at lower temperatures. The stable carbon isotopic fractionation between unpyrolyzed kerogen and n-alkanes generated during the primary stage of oil generation is minor in the presence of formation water, but smaller relative to experiments using distilled water. Positive correlations between pyrolysis temperatures and delta 13C ratios of n-C17, n-C18 and n-C19 were observed in experiments using formation water.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Khawla Ouirghi, Amina Mabrouk El Asmi, Anis Bel Haj Mohamed, Moncef Saidi, Maria-Fernanda Romero-Sarmiento
Summary: Samples from Permian rock formations in southern Tunisia were evaluated using the Rock-Eval (R) Shale PlayTM method, revealing high organic matter content of type II2-III and an active Permian oil/gas prone source rock in the Dahar and Jeffara areas with suboxic and normal salinity depositional environments.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jinzhang Jia, Hailong Song, Peng Jia
Summary: In this study, adsorption simulations were conducted to investigate the amount and control mechanism of methane adsorbed by different coal rank coals. The results showed that the adsorption of methane was mainly concentrated in the effective pores of coal molecules, and the isosteric heat exhibited an exponential relationship with adsorption pressure.
Article
Geosciences, Multidisciplinary
Haikuan Nie, Pei Li, Qing Chen, Zhijun Jin, Quanyou Liu, Wei Dang, Qian Chen, Jianghui Ding, Changbo Zhai
Summary: This study investigates the shale quality and shale gas potential in the upper Ordovician to lower Silurian formations in the Sichuan Basin of southern China. The distribution and characteristics of organic-rich shale are analyzed, aiding in the assessment of shale gas potential and identification of sweet spots.
Article
Geochemistry & Geophysics
Xiangxian Ma, Bei Liu, Corey Brazell, Maria Mastalerz, Agnieszka Drobniak, Arndt Schimmelmann
Summary: This study provides experimental evidence for geocatalytically mediated methanogenesis in immature to early mature shale and coal source rocks at temperatures from 80 to 120 degrees C over a long-term period. The research shows varying propensities of different shales and coals to generate methane and carbon dioxide, with higher temperatures enhancing catalytic methanogenesis activities.
ORGANIC GEOCHEMISTRY
(2021)
Article
Energy & Fuels
Shuji Tamamura, Takuma Murakami, Akio Ueno, Satoshi Tamazawa, Tamotsu Kiyama, Hidenori Inomata, Hiroyuki Matsumoto, Kagemi Uchida, Yoshiaki Suzuki, Jun Aizawa, Katsuhiko Kaneko
Summary: Isotopic analysis of rocks and sedimentary rocks from the Kushiro Coal Mine in Japan reveals the presence of thermogenic methane in some closed pores.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Guangyou Zhu, Alexei V. Milkov, Zhiyao Zhang, Chonghao Sun, Xiaoxiao Zhou, Feiran Chen, Jianfa Han, Yongfeng Zhu
Article
Energy & Fuels
Guangyou Zhu, Zhiyao Zhang, Alexei V. Milkov, Xiaoxiao Zhou, Haijun Yang, Jianfa Han
Article
Geosciences, Multidisciplinary
Alexei Milkov, William C. Navidi
Article
Geosciences, Multidisciplinary
Alexei Milkov, Jack M. Samis
Article
Geosciences, Multidisciplinary
Muhammed Emin Bulguroglu, Alexei V. Milkov
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geochemistry & Geophysics
Alexei Milkov, Mohinudeen Faiz, Giuseppe Etiope
ORGANIC GEOCHEMISTRY
(2020)
Article
Multidisciplinary Sciences
Alexei Milkov, Stefan Schwietzke, Grant Allen, Owen A. Sherwood, Giuseppe Etiope
SCIENTIFIC REPORTS
(2020)
Article
Energy & Fuels
Meng Wang, Guangyou Zhu, Alexei V. Milkov, Linxian Chi
Editorial Material
Geosciences, Multidisciplinary
Muhammed Emin Bulguroglu, Alexei V. Milkov
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Jack M. Samis, Alexei Milkov
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
A. V. Milkov
JOURNAL OF PETROLEUM GEOLOGY
(2020)
Article
Computer Science, Interdisciplinary Applications
John E. Snodgrass, Alexei Milkov
COMPUTERS & GEOSCIENCES
(2020)
Article
Energy & Fuels
Guangyou Zhu, Alexei Milkov, Jingfei Li, Nan Xue, Yongquan Chen, Jianfeng Hu, Tingting Li, Zhiyao Zhang, Zhiyong Chen
Summary: The LT1 well in the Tarim Basin of China has reached a record depth in Asia and has yielded significant amounts of oil and gas from the Cambrian Wusongger Formation. With a high pressure of 90.8 Mpa and temperature of 162 degrees C, this discovery provides valuable insights for global exploration of Paleozoic ultra-deep oil.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Alexei Milkov
Summary: It is essential for petroleum explorers and exploration companies to differentiate between geological success probability and success-case volumes, accurately report expected outcomes of exploration wells, and understand key differences in geological PoS and success-case volumes. Proper reporting and modeling of drilling outcomes will lead to better decisions and maximize the expected value of exploration projects. Postmortem evaluations should compare well outcomes with pre-drill assessments to ensure accuracy and improve future decision-making.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)