Article
Energy & Fuels
Detian Yan, Shuangjian Li, Haijiao Fu, David M. Jasper, Sandong Zhou, Xiangrong Yang, Bao Zhang, Hassan Nasir Mangi
Summary: The study indicates that the formation of Early Silurian organic-rich black shales on the Yangtze Platform is influenced by various factors, including biological, terrestrial, volcanic, and authigenic sources. The geochemical characteristics of these shales show influences from marine environments and volcanic ash deposition, demonstrating high marine productivity and organic matter enrichment.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Lulu Xu, Saipeng Huang, Mengdi Sun, Yaru Wen, Wei Chen, Yanling Zhang, Fan Luo, Hao Zhang
Summary: This paper investigates the palaeoenvironmental conditions and organic matter accumulation mechanisms of the Wufeng-Longmaxi shales in western Hubei, and finds promising prospects for shale gas exploration in the eastern Yiling block.
Article
Geosciences, Multidisciplinary
Tian Dong, Chuan Wang, Xing Liang, Gaocheng Wang, Shu Jiang
Summary: This study investigates the relative importance of productivity and anoxia in the accumulation of organic matter in the Wufeng-Longmaxi black shales. The research combines various analytical methods to understand the evolution of factors controlling organic matter accumulation across the Ordovician-Silurian boundary. The findings highlight the significance of elevated productivity driven by upwelling in the accumulation of organic matter.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Wenhao Li, Xiuzhe Wang, Min Wang, Erqiang Yang
Summary: This paper discusses the organic petrological characteristics of graptolite and its contribution to buried organic carbon in the Longmaxi Formation shale in the Yangtze Region of China. It was found that graptolite is widely distributed in the samples, but its contribution to organic carbon burial is relatively small. Solid bitumen in the organic-rich shales contributes more to buried organic carbon.
Article
Geosciences, Multidisciplinary
Kun Zhang, Yan Song, Zhenxue Jiang, Xuejiao Yuan, Xueying Wang, Fengli Han, Liwen Zhang, Liangyi Tang, Pei Liu, Yiming Yang, Yao Zeng, Xuecheng Chen, Zehao Zheng
Summary: The study analyzed the presence of methane molecules in marine shale in southern China's Yangtze region, finding that most of the methane molecules are located in organic matter pores, with a smaller amount found in clay mineral pores.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Yapei Ye, Shuheng Tang, Zhaodong Xi, Donglin Lin, Youyi Shen
Summary: This study investigated the relationship between sedimentary environments, grain assemblages, and shale brittleness in the Wufeng-Longmaxi marine shale through a series of experiments including petrographic observations, mineral compositions, rock mechanics, and major (trace) element analyses. The results showed that the WF shale samples deposited under a sedimentary environment with low terrigenous detrital influx, suboxic depositional water, and high paleoproductivity exhibited the highest energy-based brittleness index. The study also found that dolomite grew in situ during early diagenesis and that different sedimentary environments controlled the formation of carbonate minerals in the shale samples.
Article
Geosciences, Multidisciplinary
Shaoze Zhao, Yong Li, Yingjiao Xu, Leli Cheng, Zhou Nie, Liang Zhao
Summary: This study examines the microstructural characteristics, TOC content, and well log characteristics of the black shales in the Wufeng-Longmaxi Formation in China's Upper Yangtze Region. It also explores the influence of Earth's orbital parameters on organic matter enrichment in these shales. The results show that the black shales have a higher level of organic matter enrichment during the long eccentricity minima, corresponding to Earth's cold period.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Xueying Ma, James Ogg, Yuanzheng Lu, Ru Fan, Chunju Huang, Zhong Luo, Shenghui Deng
Summary: This study surveyed and sampled the Upper Ordovician sections on the Upper Yangtze Platform, and identified a positive 813C excursion, the Pagoda Positive 813C Excursion (PPCE), through geochemo-bio-cyclostratigraphy evidences. Spectral analysis of high-resolution magnetic susceptibility logs showed consistent wavelengths, and the duration of the PPCE event was determined to be 3.7 to 4.4 million years. This is the first documentation of the PPCE event on the Upper Yangtze Platform, revising the previous description.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Yaowen Wu, Hui Tian, Tengfei Li, Sui Ji, Zeyang Liu, Xianming Xiao, Luhua Xie
Summary: The study in South China during the early Carboniferous period found that terrestrial organic matter played a significant role in paleo-environmental changes and organic matter deposition in black shales. Key indicators such as sedimentary delta N-15 values and the organic matter compositions highlighted the contribution of terrestrial OM to marine sediments. In summary, the transportation of large quantities of TOM from land to ocean may have led to a significant decrease in atmospheric pCO(2) levels and subsequent cooling climate.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Fangyi Gong, Michael M. Joachimski, Guanzhou Yan, Lixia Li, Xin Wei, Rongchang Wu
Summary: This study conducted high-resolution carbon isotope chemostratigraphy on Middle to Late Ordovician carbonates in South China, and identified three carbon isotope shifts. These findings provide new evidence for changes in the global carbon cycle from Darriwilian to Early Katian, which may have been influenced by global climate and primary productivity changes.
GEOLOGICAL JOURNAL
(2021)
Article
Energy & Fuels
Zhazha Hu, Garri Gaus, Timo Seemann, Qian Zhang, Ralf Littke, Reinhard Fink
Summary: This study evaluated the shale gas potential of Ediacaran and Lower Silurian shales from the Upper Yangtze platform, focusing on the contributions of clay minerals and organic matter to sorption capacity. Results showed that Ediacaran shales have comparable properties to other producing shale gas systems but exhibit differences with lower Silurian shales in terms of pore structure and overall porosity, affecting gas production. The study also identified the significant influence of TOC content and clay minerals on sorption capacity, highlighting the complex factors affecting shale gas potential.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Geosciences, Multidisciplinary
Brian Horsfield, Caineng Zou, Jian Li, Shengyu Yang, Nicolaj Mahlstedt, David Misch, Doris Gross, Ma Wei, Yifeng Wang, Jingqiang Tan
Summary: China is believed to have the largest shale gas resources globally, with the highest potential in the Sichuan Basin targeting the Cambrian and Silurian Formations. Lower Paleozoic shales in the basin are kerogen-rich and bitumen-poor, with late gas generation capped at 3% equivalent vitrinite reflectance. Late gas charge potential can be increased by raising the prospective acreage to the 3% R-o limit.
Article
Geosciences, Multidisciplinary
Lulu Xu, Saipeng Huang, Yang Wang, Xianghui Zhou, Zaoxue Liu, Yaru Wen, Yanlin Zhang, Mengdi Sun
Summary: The deposition of black shale is influenced by several factors, including organic matter input, preservation, and dilution. The individual contribution of these factors to organic matter enrichment is complex due to variations in palaeodepositional conditions. This study investigated the palaeoenvironmental conditions and organic matter enrichment mechanisms in the Wufeng-Longmaxi Formation in western Hubei. The findings reveal the presence of different mineral compositions in the Guanyinqiao Formation and variations in silica origin, warm and humid climate, and factors influencing organic matter enrichment.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Multidisciplinary Sciences
Yongsheng Liu, Wei Chen, Stephen F. Foley, Yan'an Shen, Chunfei Chen, Junhua Li, Xiaobin Ou, Detao He, Qinglai Feng, Jie Lin
Summary: Studies suggest that the Shuram Excursion event in the late Ediacaran period is geologically and geochemically related to igneous processes in the Doushantuo Formation in South China. These findings imply that ancient carbonate rocks, subjected to decarbonation during subduction, melting, and eruption related to the breakup of the Rodinia supercontinent, contributed to the Shuram Excursion event. This igneous model may provide a connection between the deep and shallow carbon cycles of the Earth.
Article
Geosciences, Multidisciplinary
Yunpei Gao, Xu Zhang, Chenxi Fang, Xiaoqing He, Ziyao Fang, Xiaolin Zhang
Summary: This study investigates the sulfur cycle and oceanic redox changes during the Ediacaran Period using high-resolution pyrite S-isotope data from a shallow setting in the Yangtze platform, South China. The results suggest that both global and regional environmental changes could affect the delta S-34(py) values, and spatial heterogeneity in sulfate concentrations and depositional environments may be reflected in pyrite records. Additionally, enrichments of V and U support periods of oxygenation in the Ediacaran oceans.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)