Article
Chemistry, Physical
Kangle Ding, Yan Liu, Fujia Guan, Zhenzhen Yu, Yi Wu
Summary: TSR involves the interaction between sulfates and hydrocarbons at high temperatures, and the study evaluated the reactivity of different substances and the formation mechanisms of OSCs from a chemical thermodynamic perspective. The oxidizability order of sulfate contact ion-pairs for CH4 was determined, and the involvement of NH4+, hydrogen gas, and pyrobitumen in TSR was also discussed.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Geosciences, Multidisciplinary
Huijuan Guo, Min Liu, Yunpeng Wang, Qiang Wang, Jinzhong Liu, Ping'an Peng
Summary: Evaluating the composition of organic reactants involved in thermochemical sulfate reduction (TSR) reaction and understanding the chemical and isotopic compositions of gases are crucial in exploring natural sour gas reservoirs. This study investigated variations in the gas composition during high-pressure hydro-pyrolysis experiments involving TSR reaction and thermal cracking, revealing that reaction time and reactant type affected gas yields and isotopic values. The results also highlighted the significance of alkane gas dryness, δC-13 values, and the relationship between them in estimating the composition and origin of the reactants.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Yongjie Hu, Chunfang Cai, Dawei Liu, Yanyan Peng, Tianyuan Wei, Ziwen Jiang, Rongtu Ma, Lei Jiang
Summary: This study distinguishes pyrites generated by microbial sulfate reduction (MSR) from thermochemical sulfate reduction (TSR) based on analyses on barite, pyrite, calcite, and dolomite for carbon and sulfur isotopes, and REY compositions. MSR-derived pyrites show seawater-like REY patterns and superchondritic Y/Ho ratios, with wide range of delta S-34 values correlated with arsenic contents, possibly through cryptic sulfur cycles driven by arsenic. TSR-derived pyrites have non-seawater-like REY patterns, chondritic Y/Ho ratios, and small sulfur isotopic fractionations, with associated calcites showing LREE enrichment and negative delta C-13 values. The combination method from REY patterns, delta C-13 and delta S-34 values on micro-sized pyrite and associated calcites effectively distinguishes MSR from TSR.
Article
Chemistry, Physical
Runyu Wang, Libo Lu, Jia Chen, Jiajing Kou, Hui Jin, Liejin Guo
Summary: The study investigated the mechanism of thermochemical sulfate reduction under supercritical water gasification conditions, revealing that higher sulfate reduction extent was achieved under acidic conditions.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Geochemistry & Geophysics
Xinya Yu, Dancheng Zhu, Huayao Zou, Fang Hao
Summary: Thermochemical sulfate reduction (TSR) commonly occurs in dolostone reservoirs in the Yuanba gas field in Sichuan Basin. The source of sulfate required for TSR is still debated. Through sulfur and strontium isotopic measurements, it was found that the formation of celestites is likely related to bacterial sulfate reduction (BSR). During the end-Permian regression, brine reflux resulted in the precipitation of S-34-rich celestites in the fractures and vugs of dolostone reservoirs. These findings provide a new explanation for the source of sulfate needed for late TSR.
Article
Thermodynamics
Wei Li, Jiri Jaromir Klemes, Qiuwang Wang, Min Zeng
Summary: The study aims to improve the thermo-chemical conversion behaviours of an open TCES unit using LTNE model and non-uniform porosity, with cascading reaction sub-units filled with different TCMs to ameliorate output performance. Numerical results show that cascading scheme stabilises output temperature during discharging, and increasing charging temperature and airflow inlet velocity accelerates charging rate.
Article
Engineering, Chemical
Max J. A. Romero, Daniele Duca, Vittorio Maceratesi, Sara Di Stefano, Carmine De Francesco, Giuseppe Toscano
Summary: The thermal behavior and chemical-physical characteristics of three different woody biomass species were evaluated using thermogravimetric and characterization analysis. The results showed that the most significant mass loss occurred between 150°C and 500°C, accounting for approximately 70% of the total mass loss. The residual mass at 650°C ranged from 13% to 24%. Softwood samples exhibited more stable thermal degradation compared to hardwoods and chemically-treated woods, despite all three species having a high average energy content of 19.60 MJ/kg.
Article
Multidisciplinary Sciences
Marta Sosnicka, Volker Lueders
Summary: The study investigates low-temperature phase transitions observed in natural CH4-H2S-CO2-N-2-H2O fluid inclusions, contributing to improved understanding of phase equilibria in the C-O-H-N-S system essential for modeling geological evolution of hydrocarbon and mineral systems. The findings also offer insights for future research on extraterrestrial H2S-rich planetary systems in low temperature environments.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Anlai Ma, Zhijun Jin, Cuishan Zhu, Yunpeng Wang, Jinzhong Liu, Xiao Yu, Ken Peters
Summary: This study performed TSR simulation experiments to investigate the formation mechanism and accumulation timing of thiadiamondoids. The results showed that thiadiamondoids can be generated from C0-alkylated diamondoid species by TSR. The concentration of diamondoidyl alcohols and diamondoidthiols first increased and then decreased during the TSR process. Thiadiamondoids were found to mainly form in the second stage of the TSR process within the maturity range of 1.09-1.21 Easy%Ro.
ORGANIC GEOCHEMISTRY
(2023)
Article
Engineering, Marine
Wen Zhang, Wenhui Liu, Xiaofeng Wang, Zhengliang Huang, Qingfen Kong, Houyong Luo, Dongdong Zhang, Peng Liu, Xiaoyan Chen, Zhenghong Cai
Summary: This study investigated the genesis of natural gas in the Lower Paleozoic of the mid-eastern Ordos Basin through geochemical analysis. The results showed evident differences between sub-salt and post-salt natural gas, with sub-salt natural gas having lighter carbon isotope compositions. Combining the data with regional geological background, it was found that the sub-salt natural gas consisted of a mixture of Upper Paleozoic coal-type gas and Lower Paleozoic oil-type gas.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Environmental
Onyinyechi Okoligwe, Tanja Radu, Mark C. Leaper, Jonathan L. Wagner
Summary: The method combines three complementary analytical techniques to accurately estimate the quantity of key organic waste fractions in municipal solid waste residues. It is important for characterizing complex waste residues.
Article
Chemistry, Analytical
Alexander Meshoulam, Alon Amrani, Avital Shurki
Summary: Thermochemical sulfate reduction (TSR) is a crucial organic-inorganic reaction in petroleum reservoirs with significant effects on production and processing risks. The initiation stage of TSR, which lacks sufficient understanding of the involved mechanisms, is essential for developing accurate kinetic models to predict the reaction. This study used hydrous pyrolysis experiments to simulate the early TSR stage and investigated the sulfur isotopic fractionations of sulfate, H2S, and organic sulfur compounds (OSC). Experimental results suggested the involvement of radical mechanisms in the formation of OSC. Additionally, computational results indicated that non-radical mechanisms were likely responsible for the reduction of sulfate, despite their higher activation energies compared to radical mechanisms. However, the significantly lower amount of alkenes in natural conditions may favor the competition of radical mechanisms during the initiation stage of TSR.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Thermodynamics
Haiping Huang, Hong Zhang, Denglin Han
Summary: The use of ferrocene has been shown to be effective in removing H2S, with higher hydrocarbon gas yields and altered trends in CO2 and H2S generation observed in high temperature experiments. However, its potential impact on gas compositions should be considered when evaluating its effectiveness as an in situ H2S scavenger.
Article
Engineering, Chemical
Lindsey Yue, Alicia Bayon, Wojciech Lipinski
Summary: The study found that an increase in particle size results in a decrease in carbonation extent, and the carbonation process consists of fast and slow reaction regimes, with reaction rates increasing with higher carbon dioxide concentration. The effects of carbon dioxide concentration and the distinction between fast and slow reaction regimes become more pronounced with increasing particle size.
Article
Energy & Fuels
Liangwei Xu, Keji Yang, Lei Chen, Luofu Liu, Zhenxue Jiang, Jintao Zhu, Heng Wu
Summary: H2S is a toxic and reactive gas found in coal mines, posing serious risks. However, research on H2S generation mechanism in coal seams is rare and information on concentration anomalies is limited. This study simulated different conditions of H2S generation from coal by combining high-temperature and high-pressure sealed simulations of thermochemical sulfate reduction (TSR). The results provide insights into the mechanisms and factors affecting H2S generation during coal pyrolysis and TSR reaction.
Review
Geosciences, Multidisciplinary
K. E. Peters, A. K. Burnham, C. C. Walters, O. Schenk
MARINE AND PETROLEUM GEOLOGY
(2018)
Article
Geochemistry & Geophysics
Clifford C. Walters, Frank C. Wang, Meytal B. Higgins, Marlene E. Madincea
ORGANIC GEOCHEMISTRY
(2018)
Article
Chemistry, Analytical
Kuangnan Qian, Kathleen E. Edwards, Anthony S. Mennito, Clifford C. Walters, J. Douglas Kushnerick
ANALYTICAL CHEMISTRY
(2010)
Article
Geochemistry & Geophysics
Simon R. Kelemen, Michael Sansone, Clifford C. Walters, Peter J. Kwiatek, Trudy Bolin
GEOCHIMICA ET COSMOCHIMICA ACTA
(2012)
Article
Energy & Fuels
Clifford C. Walters, Chris E. Kliewer, David N. Awwiller, Mark D. Rudnicki, Quinn R. Passey, Michael W. Lin
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2014)
Article
Geochemistry & Geophysics
Tongwei Zhang, Geoffrey S. Ellis, Clifford C. Walters, Simon R. Kelemen, Kang-shi Wang, Yongchun Tang
ORGANIC GEOCHEMISTRY
(2008)
Article
Geochemistry & Geophysics
Simon R. Kelemen, Clifford C. Walters, Peter J. Kwiatek, Mobae Afeworki, Michael Sansone, Howard Freund, Robert J. Pottorf, Hans G. Machel, Tongwei Zhang, Geoffrey S. Ellis, Yongchun Tang, Kenneth E. Peters
ORGANIC GEOCHEMISTRY
(2008)
Article
Geochemistry & Geophysics
Clifford C. Walters, Kuangnan Qian, Chunping Wu, Anthony S. Mennito, Zhibin Wei
ORGANIC GEOCHEMISTRY
(2011)
Article
Geochemistry & Geophysics
Zhibin Wei, Paul Mankiewicz, Clifford Walters, Kuangnan Qian, Ngami T. Phan, Marlene E. Madincea, Phuc T. H. Nguyen
ORGANIC GEOCHEMISTRY
(2011)
Article
Geochemistry & Geophysics
Zhibin Wei, Clifford C. Walters, J. Michael Moldowan, Paul J. Mankiewicz, Robert J. Pottorf, Yitian Xiao, Will Maze, Phuc T. H. Nguyen, Marlene E. Madincea, Ngami T. Phan, Kenneth E. Peters
ORGANIC GEOCHEMISTRY
(2012)
Article
Geochemistry & Geophysics
T. T. A. Vu, B. Horsfield, N. Mahlstedt, H. J. Schenk, S. R. Kelemen, C. C. Walters, P. J. Kwiatek, R. Sykes
ORGANIC GEOCHEMISTRY
(2013)
Article
Biotechnology & Applied Microbiology
Roger C. Prince, Clifford C. Walters
Summary: Gas chromatography and mass spectrometry are foundational tools for understanding the composition of spilled oil, but there are limitations to these techniques. GC x GC and ultrahigh resolution mass spectrometry fill gaps in our understanding of complex mixtures and nonvolatile polar species, but quantifying the complete composition of oil remains a challenge.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Frank Cheng-Yu Wang, Clifford C. Walters
ANALYTICAL CHEMISTRY
(2007)
Article
Energy & Fuels
S. R. Kelemen, M. Afeworki, M. L. Gorbaty, M. Sansone, P. J. Kwiatek, C. C. Walters, H. Freund, M. Siskin, A. E. Bence, D. J. Curry, M. Solum, R. J. Pugmire, M. Vandenbroucke, M. Leblond, F. Behar
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)