Review
Geosciences, Multidisciplinary
Feng H. Lu
Summary: Isotope rollover and reversal are common in highly mature unconventional gas systems, and the carbon isotopes of gas compounds can be used to determine gas maturity. This study integrates isotopic and chemical data with traditional maturity methods to define four maturity levels based on carbon isotopes for Paleozoic unconventional gases. The results suggest that as gas maturity increases, carbon isotopes are more influenced by maturity and less affected by source rocks.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Environmental Studies
Abel Meza, Muammer Koc
Summary: Qatar's successful entry into the LNG market, driven by strategic planning and resource utilization, has tied its economic development to LNG trade. However, challenges from new gas resources and market disruptions pose a threat to Qatar's position in the LNG market, requiring continuous strategic adjustments to navigate the increasingly complex global market dynamics.
Article
Geochemistry & Geophysics
Ruijing Zhu, Rongxi Li, Xiaoli Wu, Xiaoli Qin, Bangsheng Zhao, Futian Liu, Di Zhao
Summary: This study investigated the fluid inclusions in the Permian sandstone and Ordovician dolomite reservoirs in the central-southern Ordos Basin, finding two phases of fluid inclusions that recorded the history of natural gas formation and accumulation. The diagenetic fluids in these reservoirs showed medium-low temperature and moderate-low salinity, with natural gas accumulation being related to the Yanshanian tectonic movement.
Article
Economics
Alexandra Gritz, Guntram Wolff
Summary: Russia's weaponization of gas supplies shook the energy security of Central and Eastern Europe in 2022. The region responded by increasing alternative energy supplies and developing new gas supply routes. Renewable energy, nuclear energy, and hydrogen play important roles in the long-term. Mitigating the impact of this shock requires the EU to prioritize the integrity of its energy market.
Article
Business
Pawel Mikolajczak
Summary: The problem of precarious employment in social enterprises in emerging economies has not been well researched. This study fills this gap by examining the factors impacting precarious employment in social enterprises based on a case study of 200 Polish social enterprises. The findings highlight the importance of reducing bureaucratic obstacles and complicated formalities related to the use of public money in social enterprises. Managers can use this study to understand the causes of precarious employment in organizations.
JOURNAL OF BUSINESS RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Kangil Lee, Brian Whitacre
Summary: The study examined the impact of unconventional drilling activity on housing prices in two central counties in Oklahoma and found that the drilling activity had minimal effects on local housing prices.
Article
Geosciences, Multidisciplinary
Ziyi Wang, Nengwu Zhou, Shuangfang Lu, Yancheng Liu, Liming Lin, Yang Liu, Bo Song
Summary: This study investigates the generation, accumulation, and distribution of tight sandstone gas in the Linxing-Shenfu gas fields in the northeastern margin of the Ordos Basin. It utilizes various approaches and data analysis to characterize different types of reservoirs and their formation mechanisms.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Economics
Jianye Liu, Zuxin Li, Xuqiang Duan, Dongkun Luo, Xu Zhao, Ruolei Liu
Summary: In June 2019, China changed its unconventional natural gas subsidy policy to a competitive mode to reduce subsidy pressure and focus on specific projects. Through a comparative analysis of old and new policies and data of three types of unconventional natural gas, the impact of the new policy on shale gas, tight gas, and CBM is revealed.
Article
Geosciences, Multidisciplinary
M. Hussain, A. O. Amao, K. Al-Ramadan, L. O. Babalola, J. D. Humphrey
Summary: This paper describes how chemostratigraphic markers are used to identify and separate individual lithologies in the Paleozoic tight sand and shale reservoirs in Saudi Arabia. Through scanning and analysis of core samples, 11 chemofacies within three lithofacies were identified, revealing the sedimentation characteristics under different environments.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Xiongqi Pang, Xinhe Shao, Maowen Li, Tao Hu, Zhuoheng Chen, Kun Zhang, Fujie Jiang, Junqing Chen, Dongxia Chen, Junwen Peng, Bo Pang, Wenyang Wang
Summary: The discovery and large-scale exploration of unconventional oil/gas resources have been seen as the most important advancement in petroleum geology history since the 1980s. This study reveals correlations and differences between conventional and unconventional oil and gas reservoirs, and proposes a unified genetic classification scheme to clarify their differences and correlations.
Article
Green & Sustainable Science & Technology
Mariusz Ptak, Katarzyna Szyga-Pluta, Senlin Zhu, Lavdim Osmanaj, Mariusz Sojka
Summary: Water resources play a crucial role in the economy and environment, and ensuring an optimal amount of water at different levels is necessary. Hydrotechnical infrastructure, such as reservoirs, can be used to control water flow. This study compared the water flow in the Glowna River in Poland before and after the construction of the Kowalski Reservoir. The results showed a decreasing trend in monthly flow and maximum flow after the construction of the reservoir, indicating its effectiveness in stabilizing water flow. However, there was no significant change in minimum flow. The findings are important for understanding the impact of reservoir construction on water circulation.
Article
Engineering, Multidisciplinary
Guoxin Li, Chenggang Xian, He Liu
Summary: Unconventional oil and gas resources are crucial for increasing China's domestic reserves and production. The challenges of technology, cost, management, and methodology can be addressed through a comprehensive methodology that considers various aspects.
Article
Energy & Fuels
I. Filimonova, V. Y. Nemov, A. Komarova, M. Mishenin, V. D. Kozhevin
Summary: Challenges of global climate change involve environmental, social, and energy production issues, affecting resource extraction countries. Increased emphasis on green agenda prompts countries to shift towards green energy production.
Article
Energy & Fuels
Mattia Maeder, Olga Weiss, Konstantinos Boulouchos
Summary: The study introduces a new power system optimization model named FLEXIES to determine the cost-efficient deployment of renewable electricity generation technologies and flexibility technologies. Through a case study of power systems in Central Europe, it is found that low-carbon electricity generation, batteries, and power-to-gas are cost-efficient in 2050, while interconnections reduce total electricity generation, system costs, and carbon equivalent emissions.
Article
Energy & Fuels
Pouria Amani, Victor Rudolph, Suzanne Hurter, Mahshid Firouzi
Summary: This paper investigates and demonstrates the feasibility of using foam assisted gas lift (FAGL) for dewatering unconventional gas wells. The study shows that foam flow can effectively lift gas, liquid, and solid particulates, while maintaining a low flowing bottom hole pressure (FBHP) for a wide range of gas and water flow rates.
Article
Geosciences, Multidisciplinary
Sebastian Amberg, Stefan Back, Victoria Sachse, Ralf Littke
Summary: This study uses numerical 3D basin modeling to reconstruct the geological history of onshore northeastern Netherlands and simulate hydrocarbon generation. The results indicate that the deepest burial and highest temperatures and maturities occurred in the Paleozoic sedimentary succession of the Lauwerszee Trough and the Lower Saxony Basin.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Limnology
Grzegorz Scholtysik, Tobias Goldhammer, Helge W. Arz, Matthias Moros, Ralf Littke, Michael Hupfer
Summary: The study found that the enrichment and burial of iron, manganese, and phosphorus in Lake Arendsee in Germany have been affected by changes in redox conditions, and sediments also contain higher levels of manganese and iron.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Energy & Fuels
Ende Deng, Qian Zhang, Zhijun Jin, Rukai Zhu, Zhihua Yan, Bingren Jiang, Ralf Littke
Summary: “This study presents the organic and inorganic geochemical characterization of the Permian Longtan Shale in Guizhou Province, China. The results suggest that the Longtan Shale has high hydrocarbon generation potential, making it suitable for shale gas exploration.”
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
Zibin Zhao, Laura Zieger, Ralf Littke, Jan Schwarzbauer
Summary: The Nordlinger Ries in southern Germany contains Miocene post-impact lacustrine sediments. The main organic matter in the sediments is type I kerogen, with some exceptions containing sulfur-rich kerogen.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
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
Geosciences, Multidisciplinary
Linda Burnaz, Anton Kalmykov, Sebastian Grohmann, Georgy Kalmykov, Ralf Littke
Summary: This study aims to reconstruct the paleodepositional conditions of the Bazhenov Sea during the sedimentation of the Upper Jurassic-Lower Cretaceous Bazhenov Horizon black shales. The results show variations in sedimentary and diagenetic conditions, with organic matter accumulation and preservation mainly controlled by paleoredox conditions.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Garri Gaus, Eva-Maria Hoyer, Timo Seemann, Reinhard Fink, Florian Amann, Ralf Littke
Summary: This study investigates the potential effects of diagenesis on permeability, pore space, and unconfined compressive strength in organic-lean mudstones that have undergone different maximum burial depths. The results show that permeabilities and porosities significantly decrease up to a maximum burial depth of approximately 2,500 m, while further burial to 3,600 m has negligible impact on these properties. The findings provide important insights into the physical properties of mudstones and their relevance in oil and gas exploration and development.
ZEITSCHRIFT DER DEUTSCHEN GESELLSCHAFT FUR GEOWISSENSCHAFTEN
(2022)
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)
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
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)
