Article
Energy & Fuels
Harald Karg, Bastian Sauerer
Summary: A set of core samples were analyzed using standard organic geochemical methods and a novel Raman spectroscopic technique. The results revealed that the kerogen in these samples is amorphous marine, sulfur-rich, and oil-prone, with algal precursor material. Raman spectral features were found to correlate with geochemical maturity parameters and basin modeling results. The combined use of different maturity parameters improves the calibration of regional basin models.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Bastian Sauerer, Agnieszka Furmann, Alan Fernandes, Hanin Samara, Philip Jaeger, Omar Al-Ayed, Wael Abdallah
Summary: This study investigates thermal maturity estimation in challenging formations using Raman spectroscopy. The Far Eastern samples were found to be more mature, while the Jordanian samples were relatively immature. Raman spectroscopy allows for more accurate prediction of hydrocarbon in place and potential for recovery.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Wei Yang, Sheng He, Gangyi Zhai, Ze Tao, Xiaoqing Yuan, Sile Wei
Summary: This study combines high throughput Raman and infrared spectroscopy analysis with bitumen reflectance to confirm and validate the thermal maturity of shales. The research found that Raman parameters and infrared spectroscopy analysis can effectively assess thermal maturity, reducing the risk in shale thermal maturity evaluation.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Ye Wang, Nansheng Qiu, Xiaomin Xie, Zhongliang Ma, Longlong Li, Qianqian Feng, Liu Yang, Baojian Shen, Tenger Borjigin, Ni Tao
Summary: Organic matter reflectance measurement and Raman spectra analysis were conducted on shale samples from two wells in the Sichuan Basin, revealing that graptolite fragments and pyrobitumens are dominant in the Wufeng-Longmaxi shale, while a limited amount of pyrobitumens and vitrinite-like particles are present in the Qiongzhusi shale. Based on the results, it was found that the Wufeng-Longmaxi shale had lower maturities before the Late Permian compared to the Qiongzhusi shale, indicating a favorable time relationship for generation and accumulation of shale gas in the former.
GEOLOGICAL JOURNAL
(2021)
Article
Chemistry, Physical
Shiyu Xu, Mahmood Reza Yassin, Hassan Dehghanpour, Christen Kolbeck
Summary: This study investigates the hydrocarbon potential of calcareous shale plugs by examining their wettability and pore structure. The results show that plugs with low maturity level in the early-oil window have low oil potentials despite their TOC-rich characteristics.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Geochemistry & Geophysics
Jorge Andres Donadelli, Juan Pineda, Marcos Comerio, Clara Smal, Georgina Erra, Rodolfo Hector Acosta, Gerardo Martinez Delfa
Summary: This study compared the molecular structural changes of kerogens during natural and artificial thermal maturation by studying kerogen samples with varying levels of thermal maturity from the Vaca Muerta Formation. The results showed that heating in an anhydrous closed system accurately reproduced most of the molecular structural changes observed in natural thermal maturation, with some exceptions. Additionally, the study highlighted the variability of certain parameters in natural samples due to differences in deposition environments.
ORGANIC GEOCHEMISTRY
(2023)
Article
Chemistry, Analytical
Xiaodong Liu, Qiang Wang, Wanglu Jia, Jianzhong Song, Pingan Peng
Summary: Thermal simulation of late gas generation from source rocks is crucial for assessing the potential of deep gas and shale gas. The interactions between retained oil and thermally mature kerogen play a significant role in late gas generation. Previous studies have mainly focused on expelled oil or total oil, which differ in composition from retained oil. The impacts of oil generation, expulsion, and interactions with retained oil on H2 generation from source rocks are still poorly understood.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Energy & Fuels
Y. Zhou, Z. G. Xu, Z. H. Wu
Summary: This study investigates the formation mechanism of hydrogen sulfide during the pyrolysis process of Chang 7 type-II oil shale kerogen. XPS spectra were obtained to analyze the forms of hybrid atoms, and the pyrolysis characteristics were studied using ReaxFF. The sulfur element in the kerogen was mainly in the form of organic sulfur, and the desulfurization rate increased with higher pyrolysis temperatures. Hydrogen sulfide production was influenced by various sulfur-containing functional groups.
Article
Geochemistry & Geophysics
Jorge Andres Donadelli, Antonela Canneva, Yamila Garro Linck, Gerardo Martinez Delfa, Georgina Erra, Manuel Velasco, Maria B. Franzoni, Emilia Silletta, Rodolfo H. Acosta, Alejandra Calvo
Summary: The study focused on the molecular characteristics of organic matter in the Vaca Muerta Formation, providing novel insights for the understanding and modeling of kerogens in this shale play. The results can support and enhance the classification of kerogens based on their molecular structures.
ORGANIC GEOCHEMISTRY
(2021)
Article
Energy & Fuels
Justin E. Birdwell, Aaron M. Jubb, Paul C. Hackley, Javin J. Hatcherian
Summary: This study utilized Raman spectroscopy and optical microscopy to analyze the Late Cretaceous Boquillas Shale before and after hydrous pyrolysis, revealing micro-scale changes in organic matter composition throughout thermal maturation. The results indicate that different organic matter macerals progress along a similar trend through composition space with thermal maturation, while inertinite fragments are generally insensitive to thermal stress.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Energy & Fuels
Evgeniya Leushina, Polina Mikhaylova, Elena Kozlova, Veniamin Polyakov, Nikita Morozov, Mikhail Spasennykh
Summary: This study provides the first data on the compositional kinetics of Bazhenov kerogen decomposition, showing that the kinetic characteristics change with increasing organic matter maturity, leading to differences in product composition.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Deependra Pratap Singh, Bodhisatwa Hazra, David A. Wood, Pradeep K. Singh
Summary: This study evaluated Lower Permian Barren Measures Formation shales from two Damodar Valley sub-basins in India to understand the impact of petrographic composition and kerogen type on shale source rock potentiality and reaction kinetics. Different types of kerogen were found to influence the reactivity of shales, with higher thermal maturity levels and type III-IV kerogen-bearing shales displaying lower reactivity. Heat-altered shales with igneous intrusions showed the least reactivity, indicating the significant impact of removing hydrocarbons from shales.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Energy & Fuels
Isa Silveira de Araujo, Archana Jagadisan, Zoya Heidari
Summary: This study investigates the impact of kerogen molecular structure on the adsorption of water and methane on kerogen surfaces. The results show that the adsorption capacity of both water and methane increases with the thermal maturity of kerogen.
Article
Energy & Fuels
Kang Li, Zhongfeng Zhao, Hong Lu, Xinran Liu, Ping'an Peng, Chang Samuel Hsu
Summary: This study investigated the effect of inherent pyrite on hydrocarbon generation of kerogen through a series of experiments. The presence of pyrite in kerogen resulted in lower yield of liquid hydrocarbons and higher peak temperature for liquid hydrocarbon production. In addition, the thermal transformation of pyrite decreased the wet gas yield and increased the iso- to normal paraffin ratios.
Article
Energy & Fuels
Jizhen Zhang, Denglin Han, Chenchen Wang, Wei Lin, Huiwen Zhang, Shuo Li
Summary: Type III kerogen plays a crucial role in understanding the adsorption and enrichment mechanisms of shale gas. Molecular simulation offers valuable insights into the physical and structural properties of kerogen, supporting the investigation at a molecular level. The results show that type III kerogen exhibits stronger adsorption capacity for C2H6 compared to CH4.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
