Article
Geosciences, Multidisciplinary
Qizhang Fan, Peng Cheng, Hui Tian, Haifeng Gai, Xianming Xiao
Summary: The distribution and occurrence of pore water and retained oil in shale nanopores were investigated through a thermal simulation experiment on low-maturity marine-terrestrial transitional (MTT) shales. It was found that the water content in the shale decreased with increasing maturity, while the oil retention showed a negative correlation with water content. Pore water was observed in micropores, small non-micropores, and large non-micropores, while retained oil was mainly distributed in micropores and small non-micropores. The results highlight the importance of understanding the accumulation mechanism of shale oil and gas resources and evaluating their resource potential.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Chengang Lu, Xianming Xiao, Zhenqian Xue, Zhangxin Chen, Gang Li, Yue Feng
Summary: The pore structure and heterogeneity of marine-continental transitional shales were investigated. The fractal dimension of micropores and non-micropores were found to be correlated with their pore structure, and the organic carbon content controls the fractal dimension of micropores and certain non-micropores. The mineral compositions, especially clay minerals, affect the heterogeneity and connectivity of non-micropores.
NATURAL RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Dameng Liu, Qifeng Jia, Yidong Cai, Changjin Gao, Feng Qiu, Zheng Zhao, Siyu Chen
Summary: Coalbed methane (CBM) recovery in the Qinshui Basin can be supported by the abundant coal-bearing rocks and favorable geological conditions. This study comprehensively investigates various aspects of geological and reservoir characteristics to gain insights into CBM exploration and exploitation.
Article
Geosciences, Multidisciplinary
Hui Xiao, Nan Xie, Yuanyuan Lu, Tianyue Cheng, Wei Dang
Summary: The study of the pore structure and its controlling factors in shale reservoirs is crucial for the exploration and exploitation of shale gas. This study focused on the effects of organic and inorganic compositions on the pore structure development of Shanxi shale in the Ordos Basin. The results showed that the mineral composition and organic matter type are key factors in determining the pore structure of shale. The pore structure plays a significant role in the characteristics and development potential of shale.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Jian Sun, Xianming Xiao, Peng Cheng
Summary: This study investigates the gas-bearing property of coal-measure shale in the Qinshui Basin, North China. The results show that the shale has ultra-low saturation pore water, mainly in clay minerals, which significantly reduces its pore structure parameters and methane adsorption capacity. The adsorption of methane is controlled by the TOC content and decreases with increasing temperature. Pore water competes with methane for adsorption and weakens the inter-molecular interaction forces, especially at low temperature and pressure conditions.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Energy & Fuels
Haitao Gao, Peng Cheng, Wei Wu, Shenyang Liu, Chao Luo, Tengfei Li, Kesu Zhong, Hui Tian
Summary: In this study, the water-bearing properties and pore structures of the deep Longmaxi shales in the Luzhou Block were analyzed. The results show that the deep shales have low water-bearing extents and both organic and inorganic matter pores can store pore water. Pore water has a significant influence on nonmicropores and inorganic matter pore structures, while its influence on micropores and organic matter pore structures is less significant.
Article
Geosciences, Multidisciplinary
Peng Cheng, Xianming Xiao, Hui Tian, Jian Sun, Qizhang Fan, Haifeng Gai, Tengfei Li
Summary: In this study, overmature coal-measure shale core samples were collected and analyzed to study the water-bearing characteristics and their effects on the pore structures and gas-bearing properties of shale in the Qinshui Basin. The results showed that the pore water content of the shales is lower than the equilibrium water content, indicating low water-bearing extents. Pore water occupies a significant portion of the pore volume and surface area, affecting different pore types and widths differently.
FRONTIERS OF EARTH SCIENCE
(2023)
Article
Energy & Fuels
Jing-Ya Zhang, Ru-Kai Zhu, Song-Tao Wu, Xiao-Hua Jiang, Chang Liu, Yi Cai, Su-Rong Zhang, Tian-Shu Zhang
Summary: In this study, various methods were used to investigate the composition, microscopic occurrence, and mobility of shale oil in the Qingshankou Formation. The results show that shale oil primarily exists in the matrix pores of clay minerals, and the mineral composition and pore structures significantly impact the occurrence and mobility of shale oil.
Article
Energy & Fuels
Waheed Hammouri, Xiaowen Guo, Mahmoud Abbas, Keqing Wang
Summary: In this study, experiments and analysis were conducted to understand the generation and evolution of nanometer-sized pores in organic-rich shale. It was found that thermal maturity has a significant impact on the formation and development of shale porosity, while the influence of mineral composition and total organic carbon is relatively small. This research provides important guidance for shale gas exploration and development by studying the formation and development of shale porosity and its correlation with thermal maturity.
Article
Geography, Physical
Leifu Zhang, Dazhong Dong, Zhen Qiu, Chenjun Wu, Qin Zhang, Yuman Wang, Dexun Liu, Ze Deng, Shangwen Zhou, Songqi Pan
Summary: The study of the marine-continental transitional strata in the Upper Carboniferous to Lower Permian through high-resolution geochemical data integration reveals the characteristics of frequent sedimentary environment changes and the accumulation of organic-rich sediment under varied conditions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geochemistry & Geophysics
Pengfei Jiao, Genshun Yao, Shangwen Zhou, Zhe Yu, Shiluo Wang
Summary: The study revealed significant differences in the micropore structure between marine-continental transitional shale and marine shale, with the former lacking sufficient pore space for effective storage and preservation of natural gas. In contrast, the marine shale exhibited better gas storage conditions.
Article
Chemistry, Physical
Pei Li, Jinchuan Zhang, Reza Rezaee, Wei Dang, Xuan Tang, Haikuan Nie, Shijing Chen
Summary: The distribution of pore water in gas shale reservoirs has a significant impact on gas content and resource evaluation. This study found that adsorbed moisture in transitional clay-rich shales can be divided into different types of water in micro- and non-micropores. Additionally, factors such as thermal maturity, total organic carbon, clay, and carbonate are correlated with adsorbed moisture and pore structure.
APPLIED CLAY SCIENCE
(2021)
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
Geochemistry & Geophysics
Xianglu Tang, Wei Wu, Guanghai Zhong, Zhenxue Jiang, Shijie He, Xiaoxue Liu, Deyu Zhu, Zixin Xue, Yuru Zhou, Jiajing Yang
Summary: The study analyzed the methane adsorption capacity of different types of shales in the Sichuan Basin and found significant differences between marine, transitional, and lacustrine shales. The Longtan Formation exhibited the strongest adsorption capacity, while lacustrine shales had the weakest capacity, primarily influenced by organic matter content and thermal evolution degree.
Article
Geosciences, Multidisciplinary
Qizhang Fan, Peng Cheng, Xianming Xiao, Haifeng Gai, Qin Zhou, Tengfei Li, Ping Gao
Summary: Shale reservoirs are characterized by self-generation and self-accumulation, and the oil generation and expulsion evolutions of marine-terrestrial transitional shales differ significantly from marine and lacustrine shales. The main stages of oil expulsion in marine-terrestrial transitional shales are later than those of oil generation, with compositions dominated by heavy components. The organic sources of terrigenous higher organisms play a crucial role in determining the oil generation and expulsion evolutions of these shales.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Hongzhi Yang, Xuewen Shi, Chao Luo, Wei Wu, Yi Li, Yifan He, Kesu Zhong, Jianguo Wu
Summary: This study analyzed the mineral composition of WF-LF shale in Luzhou using field emission scanning electron microscope and Advanced Mineral Identification and Characterization System. Quartz was identified as the dominant mineral, while siliceous and carbonaceous minerals were found to have a positive effect on reservoir compressibility. Four types of reservoirs were identified based on mineralogical features.
Article
Energy & Fuels
Lei Pan, Ling Chen, Peng Cheng, Haifeng Gai
Summary: Marine-terrestrial transitional Permian shales in South China have favorable conditions for shale gas accumulation but have not been commercially exploited. This study investigates the methane adsorption characteristics of Permian shales in the Lower Yangtze area, focusing on the influences of TOC content and temperature. The results show that organic matter pores in shale play a significant role in methane storage. However, the underdeveloped pore structure of Permian shales leads to lower methane adsorption capacities compared to marine shales. It is recommended to explore Permian shales with high TOC contents, high porosity, and deep burial for future exploration efforts.
Article
Energy & Fuels
Haitao Gao, Peng Cheng, Wei Wu, Shenyang Liu, Chao Luo, Tengfei Li, Kesu Zhong, Hui Tian
Summary: In this study, the water-bearing properties and pore structures of the deep Longmaxi shales in the Luzhou Block were analyzed. The results show that the deep shales have low water-bearing extents and both organic and inorganic matter pores can store pore water. Pore water has a significant influence on nonmicropores and inorganic matter pore structures, while its influence on micropores and organic matter pore structures is less significant.
Article
Energy & Fuels
Peng Cheng, Xianming Xiao, Qizhang Fan, Ping Gao
Summary: This study investigates the shale oil development potential of the Eocene-Oligocene Shahejie Formation in the Dongying Sag, Bohai Bay Basin, eastern China. The findings reveal that the shale samples are rich in I-IIa kerogen and the oil saturation is mainly influenced by shale maturity and the volume expansion of organic matter micropores. The study also predicts the burial depth of favorable shale oil reservoirs and the sweet spot intervals of shale oil.
Article
Energy & Fuels
Yuguang Shi, Xianglu Tang, Wei Wu, Zhenxue Jiang, Shiqi Xiang, Meng Wang, Yuru Zhou, Yinping Xiao
Summary: The research investigates the differential enrichment mechanism of shale gas under a complex tectonic background, focusing on the southern Sichuan Basin. Through geochemical experiments, porosity and permeability experiments, stress experiments, and seismic interpretation, the study clarifies the structural deformation characteristics and fault characteristics under different structural styles and parts, and summarizes the differences in shale gas preservation conditions. The results show that fracture levels, fault sealing angles, and burial depth and dip angles have significant impacts on the boundary, scale, and preservation of shale gas reservoirs. Based on these findings, enrichment models for different tectonic units are established, providing important guidance for shale gas exploration and development in the Sichuan Basin.
Article
Geosciences, Multidisciplinary
Xuewen Shi, Shujuan Kang, Chao Luo, Wei Wu, Shengxian Zhao, Di Zhu, Huanxu Zhang, Yang Yang, Zhenglu Xiao, Yong Li
Summary: This paper presents a study on the Longmaxi Formation in the Sichuan Basin, which is a significant shale gas producing formation in China. The research provides carbon isotopic data that suggest better shale gas exploration potential at the bottom of the Longmaxi Formation. The study also compares the exploration prospects in different areas and recommends further drilling based on the presence of oil cracking gas resources and better reservoir conditions.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Energy & Fuels
Xuewen Shi, Wei Wu, Qiuzi Wu, Kesu Zhong, Zhenxue Jiang, Huan Miao
Summary: This study investigates the enrichment mechanism and forming type of deep shale gas in the Longmaxi Formation shale in the Desheng-Yunjin Syncline area of the Sichuan Basin. The research analyzes the mineralogy, organic geochemistry, physical properties, and gas and water content of the shale, as well as the influence of sedimentation, structural conditions, and hydrogeological conditions on gas enrichment. The results show that the shale in this area is a good hydrocarbon source rock with specific characteristics. Tectonic activities and hydrodynamic conditions have a significant impact on shale gas enrichment.
Article
Energy & Fuels
Xuewen Shi, Wei Wu, Yuguang Shi, Zhenxue Jiang, Lianbo Zeng, Shijie Ma, Xindi Shao, Xianglu Tang, Majia Zheng
Summary: The Luzhou area in the southern Sichuan Basin has undergone multiple tectonic movements, forming a complex fault system that significantly impacts the enrichment of shale gas. The control effect of fractures and structural deformation on shale gas enrichment was clarified, and a differential enrichment model of shale gas in the area was established. Structural evolution, uplift erosion, and fracture development have influenced shale gas preservation, leading to differential enrichment of shale gas reservoirs.
Article
Energy & Fuels
Jian Sun, Xianming Xiao, Peng Cheng
Summary: This study investigates the gas-bearing property of coal-measure shale in the Qinshui Basin, North China. The results show that the shale has ultra-low saturation pore water, mainly in clay minerals, which significantly reduces its pore structure parameters and methane adsorption capacity. The adsorption of methane is controlled by the TOC content and decreases with increasing temperature. Pore water competes with methane for adsorption and weakens the inter-molecular interaction forces, especially at low temperature and pressure conditions.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Zixin Xue, Zhenxue Jiang, Xin Wang, Zhiye Gao, Jiaqi Chang, Zhou Nie, Hui Li, Wei Wu, Hengyuan Qiu, Qianyou Wang, Mianzhu Hao, Ruihua Chen, Zhikai Liang
Summary: Low-resistance shale reservoirs, which have higher yields in high-mature shale gas plays, are influenced by the degree of graphitization and pore structure of organic matter. High graphitization significantly reduces rock resistivity and changes the mechanical properties of organic matter. The change in organic pore size and shape leads to a decrease in resistivity, while graphitization exceeding 15% results in poor pore development and increased exploration risk.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Fisheries
Wenfeng Zhang, Guanwen Zhang, Huaming Yu, Peng Cheng, Pengran Guo
Summary: This study investigated the characteristics and sources of metals in wild fish in the South China Sea. Lead and manganese tended to accumulate in bluespot mullet and Macao tonguesole. The concentrations of metals and the selenium:mercury molar ratios were influenced by fish species and spatial differences. The findings have important implications for understanding the state of the wild environment and its impact on human well-being.
MARINE AND FRESHWATER RESEARCH
(2023)
Article
Energy & Fuels
Meng Wang, Zhuo Li, Zhikai Liang, Zhenxue Jiang, Wei Wu
Summary: This study used BJH-AD and BJH-DE models to investigate Longmaxi Formation shale and compared the results obtained using different models. The DFT model was found to be more suitable for characterizing pores with a size below 10 nm. The PSD curves showed multiple peaks and the heterogeneity results varied among different models. By integrating nitrogen adsorption curve, hysteresis loop shape, multifractal parameters, and Cronbach's alpha, a workflow chart for nitrogen adsorption model optimization was generated.
Article
Geosciences, Multidisciplinary
Shijie Ma, Lianbo Zeng, He Tian, Xuewen Shi, Wei Wu, Shaohang Yang, Liang Luo, Xiang Xu
Summary: This study analyzes fault damage zones in deep shales in the Sichuan Basin, China using 3D seismic data. The damage zone widths were estimated using the 3D seismic variance attribute and the cumulative frequency method. It was found that the damage zone widths range from 80 m to 1570 m and stabilize with increasing displacements. The study also discusses the impact of fault damage zones on shale gas preservation and suggests that the seismic variance attribute is an effective tool for identifying deep unconventional energy.
JOURNAL OF STRUCTURAL GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Qizhang Fan, Peng Cheng, Hui Tian, Haifeng Gai, Xianming Xiao
Summary: The distribution and occurrence of pore water and retained oil in shale nanopores were investigated through a thermal simulation experiment on low-maturity marine-terrestrial transitional (MTT) shales. It was found that the water content in the shale decreased with increasing maturity, while the oil retention showed a negative correlation with water content. Pore water was observed in micropores, small non-micropores, and large non-micropores, while retained oil was mainly distributed in micropores and small non-micropores. The results highlight the importance of understanding the accumulation mechanism of shale oil and gas resources and evaluating their resource potential.
MARINE AND PETROLEUM GEOLOGY
(2023)
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)