Article
Energy & Fuels
Ziye Wang, Zhiguo Mao, Xuanjun Yuan, Xiuqin Deng, Xiao Hui, Zhongyi Zhang, Jingwei Cui
Summary: Through analysis of core observation, thin section identification, and logging and testing data, the types and characteristics of event deposits in the ninth member of Yanchang Formation in southwestern Ordos Basin, China, were examined. There are four types and nine subtypes of event deposits, including earthquake, gravity flow, volcanic, and anoxic deposits. The research found that these event deposits have intrinsic genetic relations and distribution laws. Furthermore, the genetic model of event deposits and the development of various types of deposits were discussed.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2023)
Article
Physics, Multidisciplinary
Xingying Wang, Na Liu, Junxiang Nan, Xiaolin Wang, Dazhong Ren
Summary: The study of the characteristics of the Chang 8 reservoir of Triassic Yanchang Formation in northern Shaanxi reveals that the target layer is relatively stable and uniform sinking after deposition, with complex lithology mainly composed of debris-feldspar sandstone and feldspar sandstone. The porosity of the reservoir ranges between 4% and 12%, while permeability ranges between 0.03 x 10(-3) and 0.5 x 10(-3) mu m(2). Strong compaction and well-developed cementation are key reasons for the formation of extra-low porosity and permeability reservoirs.
FRONTIERS IN PHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Ke Wu, Dezhao Chen, Weigang Zhang, Hua Yang, Hanning Wu, Xin Cheng, Yiqian Qu, Mengqing He
Summary: This study investigates the characteristics of tight sandstone reservoirs in the Chang 4+5 reservoir of the Ordos Basin. The research reveals the pore throat structure and fluid distribution patterns. The results show that different reservoir types have different pore throat structures and movable fluid parameters. The degree of fluid utilization decreases in larger pore throats while remaining relatively stable in smaller pore throats. Permeability and sorting coefficients show a good correlation with movable fluid parameters.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Qiang Tong, Zhaohui Xia, Jixin Huang, Junchang Wu, Yusheng Wang, Zheng Meng, Chaoqian Zhang
Summary: This paper studies the mineral composition, physical properties, diagenesis, and diagenetic evolution of the Jiyuan area, and compares the origins of reservoir development in two areas dominated by bidirectional provenance. The results show that different provenance leads to differences in reservoir characteristics, and clay mineral content and diagenesis are important causes of reservoir differentiation.
Article
Geochemistry & Geophysics
Zhendong Gao, Yongdong Wang, Xiaoyu Gu, Hanlie Cheng, Nnamdi Puppe
Summary: This study summarizes the development characteristics of pores and fractures in shale reservoirs and the gas-bearing characteristics of Yanchang Formation shale in the southern part of the Ordos Basin. The research shows that the cement content of sandstone in the Yanchang Formation reservoir is generally 5%-25%, and the reservoir contains a large number of primary pores, secondary pores, and microfractures. The gas content of Yanchang Formation shale is related to both organic matter and pore structure.
Article
Geosciences, Multidisciplinary
Xiaobing Niu, Tian Yang, Yingchang Cao, Shixiang Li, Xinping Zhou, Kelai Xi, Thomas J. H. Dodd
Summary: Understanding the formation processes, distribution patterns, and depositional models of gravity-flow deposits is essential for predicting and modeling sandstone bodies in subsurface lacustrine basins, which is crucial for oil and gas exploration and development. This study analyzed the gravity-flow deposits of Yanchang Formation in the Ordos Basin using various methods, including well-log analysis, core observations, thin-section analysis, and laboratory measurements. The results identified different sedimentary facies and bed types of gravity-flow deposits, with different formation mechanisms and distribution patterns.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Qiheng Guo, Shixiang Li, Zhenkui Jin, Xinping Zhou, Chenglin Liu
Summary: The geological characteristics and enrichment laws of the shale oil in the third submember of Triassic Yanchang Formation in the Ordos Basin were analyzed, and the exploration potential and orientation of the shale oil were discussed. Two types of shale oil, migratory-retained and retained, were recognized, with the former being slightly better in quality. High-quality source rocks provide a large quantity of hydrocarbon-rich fluids, with various factors such as interbeds, fractures, and sandstone layers contributing to oil accumulation and migration. The sand-rich areas around the depression are the main targets for exploring migratory-retained shale oil, while mature deep depression areas are the main targets for exploring retained oil.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2023)
Article
Geochemistry & Geophysics
Wang Zhang, Xinping Liang, Peng Li, Guoheng Liu, Jin Qian
Summary: Significant amounts of unconventional oil and gas resources have been discovered in the Yanchang Formation of Ordos Basin, primarily sourced from the shale layers in Chang 7 and 9 members. The C7-3 submember shale has the highest content of illite/smectite mixed layer and reducing minerals, while the C9 member shale has the highest percentage of quartz and illite. The C7-3 submember shale is characterized by high productivity due to type II1 kerogen, and the C9 member shale exhibits the highest organic thermal maturity.
Article
Geosciences, Multidisciplinary
Wenchao Dou, Luofu Liu, Langbo Jia, Zhengjian Xu, Mengyao Wang, Chongjiao Du
Summary: Several fractal models based on MIP have been proposed for studying the fractal property of porous materials, but results from different models may not always be consistent. By combining various analysis techniques to study the pore structure and petrophysical properties of tight sandstones, it was found that different MIP fractal models usually give different results.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Fan Jianming, Shi Jian, Wan Xiaolong, Xie Qichao, Wang Chong
Summary: The Chang 7 oil group in the Ordos Basin has been evaluated for sweetness classification through a combination of field practice and laboratory experiments, providing a reference basis for optimal well design.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Fan Zhang, Zhenxue Jiang, Hanmin Xiao, Bin Hu, Peng Chen, Xianglu Tang, Wei Sun, Lin Zhu, Qianyou Wang
Summary: This study compares the reservoir quality differences between the Chang 7 and Chang 8 members in terms of various tests, and finds that the reservoir quality of the Chang 8 member is better, which can be attributed to larger grain sizes, more abundant grain-coating chlorite, lower content of illite and carbonate cement, and better pore connectivity.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Senhu Lin, Hui Li, Xia Luo, Yan Zhang, Lijun Zhang
Summary: The relationship between oil shale's elastic behavior and geothermal parameters is crucial for identifying sweet spots and in-situ oil conversion techniques. Experimental results demonstrate that ultrasonic P-wave velocities are sensitive to pressure, while thermal experiments show that kerogen content significantly influences shale's thermal expansion coefficients and heat capacity. Quartz content also has a significant influence on shale's ultrasonic velocities and thermal parameters.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jiangwei Wei, Fawang Li, Shikuo Zhang, Hanlie Cheng, Qiang Qin, David Cadasse
Summary: This study systematically investigates the sedimentary characteristics, types of sedimentary facies and microfacies, as well as the plane distribution of sedimentary facies in the Chang 2 reservoir group in Huangjialing, north-central Ordos Basin. The results show the presence of three microfacies, which have significant implications for the later exploration of oil and gas in the Ordos Basin.
JOURNAL OF CHEMISTRY
(2022)
Article
Geosciences, Multidisciplinary
Shilin Wang, Hu Li, Lifei Lin, Shuai Yin
Summary: This study systematically investigates the development characteristics of fractures in the tight sandstone reservoirs in low-amplitude structural areas of the Upper Triassic Yanchang Formation in the western Ordos Basin. The study uses a variety of methods to study the development characteristics, prediction methods, and distribution of fractures. The research results show that fractures play an important control role in the accumulation of hydrocarbons in the Yanchang Formation.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Ruihui Zheng, Yifan Wang, Zhipeng Li, Zhihuan Zhang, Guangli Wang, Heng Zhang
Summary: This paper investigates the differences between organic-rich black shale and dark-grey mudstone in the Seventh Member of the Yanchang Formation in the Ordos Basin. It reveals that black shale has higher total organic carbon content and higher activation energy for hydrocarbon generation, resulting in a fast conversion rate and short cycle. On the other hand, dark-grey mudstone has lower total organic carbon content and lower activation energy, leading to a slower conversion rate and longer cycle. These differences are mainly influenced by the composition of macerals and the source of organic matter.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Jian Li, Xiang Zhang, Jingchun Tian, Qingshao Liang, Tongsheng Cao
Summary: The research examines the impact of deposition and diagenesis on sandstone reservoir quality, highlighting how depositional factors can influence the reservoir quality by affecting diagenesis. It emphasizes the importance of grain size, sorting, and sedimentary thickness in controlling sandstone reservoir quality.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Energy & Fuels
Yue Zhang, Jingchun Tian, Xiang Zhang, Jian Li, Qingshao Liang, Xiaoyu Zheng
Summary: This study investigates the diagenesis and pore evolution of the tight sandstone reservoir in the Shanxi Formation. The results provide insights into the physical properties and diagenetic evolution of the reservoir, as well as quantitatively calculating the pore loss during the diagenetic process. The findings contribute to the understanding and development of tight sandstone reservoirs.
Article
Energy & Fuels
Jian Li, Jingchun Tian, Xiang Zhang, Qingshao Liang, Minghong Peng
Summary: By combining geochemistry and petrology, this study investigated the Xifangshan Formation sandstones in the Precambrian northwestern Tarim Basin, NW China. The results suggest that the sandstones were deposited in an oxic-suboxic marine environment with a felsic provenance from an acidic magmatic arc.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Review
Geosciences, Multidisciplinary
Fuquan Yang, Xinxia Geng, Zhixin Zhang, Guoren Liu, Hanqing Zhang
Summary: Northern Xinjiang in China is an important part of the Central Asian Orogenic Belt, characterized by multiple episodes and types of mineralization. Cu and Au deposits are mostly found in Altay, Junggar, and Tianshan, with minor occurrences in Beishan. The most common types of Cu-Au deposits are volcanogenic and porphyry deposits. The formation of Cu-Au deposits can be divided into five mineralization episodes, with the Devonian and Carboniferous being the main periods. These deposits developed in various tectonic settings, including island arc, continental arc, collision, and postcollisional extensional tectonics.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Jiang Zhu, Dan-yang Liu, Chao Chen, Song Chen, Yuan-bing Zou, Leonid Danyushevsky, Jing-meng Huang, Xiang-wei Tang
Summary: Numerous lode gold and silver deposits have been discovered in orogenic belts in China. This study focuses on the formation and fluid evolutions of the super-large Yingdongpo gold and giant Poshan silver deposits in the Tongbai-Dabie orogen. The results suggest that both deposits were formed concurrently with Early Cretaceous granitic magmatism and the ore-forming fluids were primarily of magmatic origin with meteoric water inputting. The gold mineralization is related to a change in the physicochemical properties of the fluids, while the silver mineralization is favored by progressive deposition of sulfides in a slowly cooling hydrothermal system.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Arun Bhadran, B. P. Duarah, Drishya Girishbai, Mohammad Atif Raza, Avi Mero, Sandeep Lahon, A. L. Achu, Girish Gopinath
Summary: The Brahmaputra foreland basin, known for its dynamic tectonism and sediment load, exhibits a variety of seismically generated soft sediment deformation structures (SSDS) such as clastic dikes, sand sills, and micro-faults. These structures, influenced by multiple strong seismic events, are characterized by their dimensions, intrusion angles, cross-cutting relations, wall shattering, and age. The study suggests that a significant earthquake with high intensity and magnitude might have caused liquefaction features in the area. The findings highlight the importance of studying SSDS in tectonically active regions with limited surface ruptures and dense alluvial cover.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Huan Wang, Lirong Dou, Xingyang Zhang, Jiquan Yin, Beiwei Luo, Haigang Duan, Peiguang Yang, Yifan Song
Summary: Quantitative analysis of sediment composition and microfacies helped identify changes in facies belts in the Cretaceous Mishrif Formation. The study demonstrated the importance of carbonate microfacies quantification and its implications for paleogeographic research.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Boran Wang, Zhilong Huang, Dongsheng Xiao, Haiyue Yu, Wenren Zeng, Xin Wang, Tong Qu, Zhiyuan Li, Yizhuo Yang
Summary: By systematically analyzing the source rocks of the Sangonghe Formation in the Taibei Sag, NW China, and using kerogen kinetics modeling, this study reveals the influence of geological conditions on hydrocarbon generation and expulsion. The source rocks in different environments show distinct geochemical characteristics and hydrocarbon generation potential.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Haiying Yang, Zhifang Zhao, Haifeng Fan, Min Zeng, Jiafei Xiao, Xiqiang Liu, Shengwei Wu, Jiangqin Chao, Yong Xia
Summary: This paper investigates the REE enrichment and the role of Fe/Mn (oxyhydr)oxides in marine phosphorites from the early Cambrian period in South China. The study reveals that Fe/Mn (oxyhydr)oxides play a crucial role in REE enrichment and are controlled by Fe-redox pumping.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Qing Li, Hongbin Wang, Feng Cai, Di Luo, Fanxing Kong, Ang Li, Xiting Liu
Summary: The elemental and isotopic compositions and abundance of carbonates in marine sediments are used to reconstruct ancient climate and ocean conditions. This study analyzed sediment samples from the Okinawa Trough to examine the relationship between carbonates' compositions and methane seepage and sea-level changes. The results indicate that both biogenic and authigenic carbonates are important factors in understanding paleoclimate and paleoceanography.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Maryam Akbarzadeh Aghdam, Abdolreza Ghods, Farhad Sobouti, Khalil Motaghi, Keith Priestley, Mohammad Enayat
Summary: The Makran subduction zone is difficult to monitor due to limited seismic activity, but a temporary seismic network was installed to investigate the relationship between different regions and detect seismicity. The observed seismicity suggests the presence of structural boundaries and seismically inactive areas.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Zhen-Yu Wang, Hong-Rui Fan, Hai-Dong She, Kui-Feng Yang
Summary: This study conducted detailed geochemical, geochronological and isotopic analyses on the Songxian syenite in the Qinling Orogen. The results revealed the magma sources, petrogenesis and geodynamic implications of this alkaline intrusion. The study suggests that the syenite was formed through multiple stages of magmatism, involving the partial melting of the enriched lithospheric mantle and mixing with melts derived from the lower crust.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Yu Li, Wen-Liang Xu, Xiao-Ming Zhang, Jie Tang
Summary: This study presents new zircon U-Pb-Hf and whole-rock geochemical data for Jurassic intrusive rocks in the Yanbian area of NE China, providing insights into the subduction history of the Paleo-Pacific Plate. The study reveals three stages of Jurassic magmatism in the area, indicating the presence of an active continental margin related to the initial subduction of the Paleo-Pacific Plate beneath the Eurasian continent.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Lina Ai, Shengfa Liu, Shuai Cong, Hui Zhang, Peng Cao, Kaikai Wu, Wenxing Ye, Che Abd Rahim Mohamed, Xuefa Shi
Summary: This study investigates the depositional configurations and sedimentary environments of the Malacca Strait through analyzing grain size characteristics and hydrographic data. The results show that residual sediments are concentrated in the central region, while modern terrigenous sediments are distributed along the coast of Malaysia and the northern region. The sedimentary environments are influenced by seasonal variations and hydrodynamic conditions.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Liang Xiao, Jia-qi Liang, Li-yan Guo, De-shuang Ji, Man Yuan, Xiang-chuan Li, Nan Sun, Zuo-chen Li
Summary: This study investigates the correlation between stable carbon isotopes of plant fossils and CO2 levels in the Jurassic period. The results suggest a weak correlation between the two, indicating caution is needed when using stable carbon isotopes to reconstruct high paleo-CO2 concentrations.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xuli Yang, Feng Huang, Jifeng Xu, Xijun Liu, Liying Zhang, Zhao Zhang, Benyan Xu, Man Zhang, Yunchuan Zeng, Qian Liu, Mingda Lv
Summary: The extensively developed Early Cretaceous intermediate-felsic rocks in the northern North China Craton provide valuable insights into the nature of Paleo-Pacific subduction and associated geodynamic processes. Geochemical and geochronological analyses of trachyandesites and rhyolites from the eastern Hebei, northern NCC suggest that the trachyandesites likely originated from enriched mafic lower crust and the rhyolites are derived from the trachyandesitic magmas through fractional crystallization. The migration direction change of these rocks is believed to be primarily attributed to slab rollback of the subducting Paleo-Pacific Plate.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Wei Liu, Ping Gao, Xianming Xiao, Yanming Zhao, Yijie Xing, Jinku Li
Summary: The organic-rich shales of the Shuijingtuo Formation in China are an important target for shale gas exploration. The upper section of the formation, primarily consisting of limestone, silty shale, and black shale, has been rarely studied but recently showed promising results for shale gas exploration. Geochemical investigations of the upper section shale deposits revealed that the organic matter enrichment mechanism underwent dynamic changes due to relative sea-level changes and episodic upwelling activities.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xin Wang, Chen Zhang, Zixin Xue, Qianyou Wang, Zhenxue Jiang, Kun Zhang, Xiangye Kong
Summary: This study analyzed the heterogeneity of gas compositions and the effects of magmatism on gas accumulation in shale gas exploration in the Yangtze plate. The results showed that magmatism caused the development of micro-fractures in shale reservoirs and accelerated the thermal evolution rate of organic matter. The impact of magmatism on shale gas accumulation varied in different regions, either favoring or compromising efficient gas accumulation in shale reservoirs.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
