Article
Energy & Fuels
Wei Liubin, Zhao Junxing, Su Zhongtang, Wei Xinshan, Ren Junfeng, Huang Zhengliang, Wu Chunying
Summary: Analyzing outcrop profiles, drilling cores, cast thin sections, etc., this study systematically analyzed the types, microfacies combinations, and distribution patterns of microbial carbonates in the middle assemblage of the mid-eastern Ordos Basin during the Ordovician period. The distribution of microbial carbonates is influenced by sequence cycles, sedimentary facies changes, and ancient landforms, and they are mainly found in the tidal flat environment during specific depositional stages in different sub-members of the Ordovician middle assemblage.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Energy & Fuels
Ying Xiong, Li-Chao Wang, Xiu-Cheng Tan, Yun Liu, Ming-Jie Liu, Zhan-Feng Qiao
Summary: The dolomitization of Majiagou Formation went through multiple stages, influenced by different sedimentary facies and ancient fluids, providing insights into the rock history of old superimposed basins.
Article
Geosciences, Multidisciplinary
Xiuyan Liu, Alexandre Tarantola, Honghan Chen, Yahao Huang, Zhongrui Wu, Junjia Fan, Majid Safaei-Farouji, Mehdi Ostadhassan
Summary: By measuring fluid inclusions in halite samples from the Qianjiang Formation in the Jianghan Basin, it was found that the temperature fluctuations in the middle Eocene were similar to those in Death Valley, indicating the presence of a monsoon climate during that time.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Baiqiang Li, Zhenzhen Wu, Taofa Zhou, Bin Chen, Qicong Wang, Xiaoli Zhang
Summary: Diagenetic fluids play a crucial role in modifying reservoirs, affecting petrographic, storage capacity, and geochemical characteristics. This study analyzed two types of dolostone in the Majiagou Formation, revealing different petrological and reservoir properties. The diagenetic fluid properties were characterized through various analytical methods, helping to understand the dolomitization process and predict storage capacity.
Article
Energy & Fuels
Danfeng Mao, Dengfa He, Hongping Bao, Liubin Wei, Yanhua Xu, Xiang Cheng, Junyi Gou, Saijun Wu
Summary: This paper presents the distribution and tectonic evolution of the Wushenqi paleo-uplift in the Ordos Basin. The paleo-uplift is a compressional structure formed during the Early Caledonian orogeny, with an elliptical shape and a length of 194 km in the S-N direction. It has a controlling effect on sedimentary reservoirs and hydrocarbon accumulation. Evaluation: 7/10
PETROLEUM EXPLORATION AND DEVELOPMENT
(2023)
Review
Geology
Juntao Zhang, Chao Chang, Xiaohui Jin, Jiaqi Yang
Summary: The dolomite reservoir in the 5th member of the Ordovician Majiagou Formation (M5) in the Ordos Basin can be divided into gypsum-bearing and gypsum-free reservoirs. The gypsum-bearing reservoir mainly develops in the 1-4th sub-members of M5 and is composed of micritic to silt-sized dolomite. The gypsum-free reservoir occurs mainly in the 5th sub-member of M5, consisting of silt-sized to fine-grained dolomite.
CARBONATES AND EVAPORITES
(2023)
Article
Geochemistry & Geophysics
Haiyan Wu, Ting Liang, Chao Gao, Yanjun Wu, Hongxia Cao, Jun Yu, Fenfei Bai, Jianbo Sun, Keyong Li, Yanqin Guo
Summary: A study was conducted on the Yan'an gas field to examine the natural gas reserves, diagenetic evolution, and different diagenesis environments. The results showed the lithology of the reservoir and the filling materials, as well as the carbon and oxygen isotope values and Sr-87/Sr-86 values. The stratigraphic development indicated a cyclical trend, and the fluid inclusions revealed the sources of fluids in the sedimentation and diagenesis process.
Article
Energy & Fuels
Wenxue Han, Shizhen Tao, Jinzhong Liu, Guangxi Ou, Weijiao Ma
Summary: By comparing the geochemical parameters of fluid inclusions and produced gases, it was found that the more depleted ethane carbon isotopic values in the Southeastern gas field were caused by higher thermal maturity leading to secondary effects.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Jiaqi Yang, Juntao Zhang, Zhiliang He, Macro Brandano, Chongyang Wu
Summary: This study focused on identifying the types and origins of calcite cements in the Majiagou Formation of the Ordos Basin in China. Petrology, isotopes, and element analysis were conducted, revealing five types of calcite cements, four types of cathodoluminescence intensities, and six types of rare earth element patterns. These findings provide valuable insights for predicting reservoir quality in limestone formations during oil and gas exploration.
Article
Energy & Fuels
Baobao Wang, Xiucheng Tan, Wenjie Su, Wei Yan, Di Xiao, Mushi Guo, Shoukang Zhong, Yuqing Xu, Mengying Yang
Summary: This study investigates the nature and types of dolomite reservoirs in the Ordos Basin, China, and delves into the reservoir characteristics, diagenetic history, and fluid-related mechanisms that influence dolomite reservoir development and preservation in gypsum-carbonate rock assemblages. Results suggest that dolomite reservoirs in the studied area have undergone complex multistage development, primarily in the depositional to penecontemporaneous stages, providing new insights into the origins of deeply buried dolomite reservoirs in carbonate-evaporite successions.
ENERGY EXPLORATION & EXPLOITATION
(2022)
Article
Geochemistry & Geophysics
Xiaoxia Peng, Guobin Li, Xin Cheng, Ling Guo
Summary: This study conducted a comprehensive analysis of pore types and karstification forms in the fifth member of the Majiagou Formation in the Ordos Basin. The research identified interparticle pores, separate-vuggy pores, and touching-vuggy pores in the formation. The dominant forms of karstification were syngenetic karstification, weathering crust karstification, and burial karstification. The study emphasized the influence of factors such as sea level fluctuations, exposure duration, and acidic formation water on the observed patterns of karstification. The study also highlighted the importance of structural and composite fractures in oil and gas migration and reservoir development.
Article
Energy & Fuels
Xu Wanglin, Li Jianzhong, Liu Xinshe, Li Ningxi, Zhang Caili, Zhang Yueqiao, Fu Ling, Bai Ying, Huang Zhengliang, Gao Jianrong, Sun Yuanshi, Song Wei
Summary: This study evaluated the source rocks and reservoirs in the Ordovician lower assemblage in Ordos Basin through drilling cores, well logging and seismic data. The natural gas identified is high thermal evolution dry gas from marine source rock, characterized by specific isotopic features. The distribution of reservoirs is controlled by palaeo-uplift during the sedimentary period.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Energy & Fuels
Jia-Qi Yang, Jun-Tao Zhang, Zhi-Liang He, Tao Zhang
Summary: Reconstructing paleoenvironments is crucial for understanding the development and evolution of carbonate reservoirs. The Middle Ordovician Period is significant for its greenhouse conditions and biological evolution. By analyzing the carbonate rocks in the Dingbei area of the Ordos Basin, the paleoenvironment was reconstructed, revealing high seawater paleotemperature, suboxic-anoxic paleoredox conditions, and high seawater paleosalinity. The presence of planktonic organisms led to an increase in total organic carbon, providing a supplementary source for natural gas. The dissolution of gypsum and its residual presence further contributed to the preservation of natural gas. This study provides valuable data and a theoretical basis for natural gas exploration.
Article
Chemistry, Multidisciplinary
Tao Feng, Yong Feng, Jiguang Tang, Yue Cui, Bin Wang, Fuxing Peng, Dechao Qin, Yue Zhang
Summary: The main types of diagenesis and diagenetic minerals in the Ordovician ultradeep carbonate reservoir were determined through microscopic observations, fluorescence detection, and luminescence analysis. The time sequence of reservoir diagenesis and hydrocarbon-related events was established by analyzing hydrocarbon inclusions and their relationship with host minerals. The Ordovician formations experienced multiple periods of hydrocarbon charging and structural transformation in relation to diagenesis processes.
Article
Geology
Luojing Wang, Dawei Lv, James C. Hower, Zhihui Zhang, Munira Raji, Jigen Tang, Yamin Liu, Jie Gao
Summary: The purpose of this study is to investigate the geochemical characteristics and paleoclimate significance of Middle Jurassic Aalenian coals in the Ordos Basin in north China. The results show that these coals are highly enriched in critical elements and have a negative Eu anomaly. The Sr/Cu and Sr/Ba data indicate a climate change from a relatively arid condition to a more humid climate.
ORE GEOLOGY REVIEWS
(2022)
