Article
Chemistry, Multidisciplinary
Guozhen Wang, Zhenxue Jiang, Houjian Gong, Yuguang Shi, Shijie He, Huan Miao
Summary: In this study, a mathematical model of shale gas diffusion was established and the evolution history of temperature, pressure, and stratigraphic physical properties was calculated. The study found that there is a significant amount of gas diffusion loss in the Longmaxi Formation shale in the Sichuan Basin, which has important implications for the migration and accumulation of natural gas.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Qin Zhang, Feng Liang, Jingbo Zeng, Zhen Qiu, Shangwen Zhou, Wen Liu, Weiliang Kong
Summary: A comparative study of the depositional environments of the Qiongzhusi and Longmaxi formations was conducted using well cores. The study found that the Qiongzhusi formation had lower detrital flow and higher anoxic conditions compared to the Longmaxi formation.
Article
Energy & Fuels
Ruolong Chi, Ping Gao, Yidong Cai, Ruobing Liu, Jinghan Du, Qin Zhou
Summary: This study investigated the types and development characteristics of pores in the ultra-deep organic-rich shale reservoirs of the Eastern Sichuan Basin. The results showed that the dominant pore types were organic pores, mineral matrix pores, and micro-fractures. The development of organic pores was influenced by the content of organic matter and brittle minerals, with higher contents contributing to their development and preservation.
Article
Geosciences, Multidisciplinary
Yijia Wu, Hongming Tang, Jing Li, Zhi Gao, Bei Yang, Cheng Yang, Tian Tang
Summary: This study focuses on the Long 1(1) sub-member of the Wufeng Formation and the Longmaxi Formation in the East Weiyuan-North Rongchang area of the southern Sichuan Basin. By analyzing core, logging, production test data, as well as using various analysis methods, the composition, geochemical characteristics, and reservoir structure of the shale are studied. The results show that the organic matter maturity and TOC content are high, and organic pores and fractures are important reservoir spaces.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Yuexiang Hao, Yizhen Li, Qing Zhang, Wei Jiang, Xusheng Liang, Benqiang Wang, Yanjun Lu, Hongjian Zhu
Summary: This study investigates the microstructure and reservoir quality of marine shale in the Weiyuan Block of the Sichuan Basin. The results show that both shallow and deep shales have similar mineral and organic geochemical characteristics, with high organic carbon content. The study suggests that the deep shale in the Weiyuan Block is a high-quality shale and should be an important target for deep shale gas exploration.
ENERGY EXPLORATION & EXPLOITATION
(2023)
Article
Energy & Fuels
Huan Miao, Zhenxue Jiang, Xianglu Tang, Guozhen Wang, Qiuzi Wu, Wenlong Fan, Hongyang Zheng
Summary: This study analyzes the physical evolution, burial history, thermal history, hydrocarbon generation history of the Longmaxi Formation shale in the Weiyuan Block, and discusses the impact of uplift amplitude on shale gas reservoirs, shale gas transport pattern, and shale gas enrichment pattern. The results show that the Weiyuan Block has experienced uplift after reaching maximum burial depth, with an erosion amount of 2000-4200 m. The migration of shale gas is mainly contributed by Darcy flow and slippage flow, and the enrichment of shale gas is significantly impacted by the uplift amplitude. The Longmaxi Formation shale gas reservoirs can be categorized into five types based on uplift amplitude, migration characteristics, and pressure coefficients.
Article
Geochemistry & Geophysics
Ang Li, Siyuan Su, Xuesong Li, Jiahao Zhang, Cui Jing, Zhenduo Zhao
Summary: This study investigates the characteristics of graphitized shale and the impact of organic matter graphitization on shale gas accumulation. The results show that organic matter graphitization is a result of thermal metamorphism, leading to lower resistivity in graphitized shale. The graphitization of organic matter can damage hydrocarbon generation and reservoir capacity, resulting in reduced gas content. The brittleness of graphitized shale increases, and the destruction of organic and intercrystalline pores leads to deterioration of reservoir physical properties. Graphitized organic matter has good electrical conductivity, explaining the formation of low-resistivity shale. Early hydrocarbon generation, poor reservoir physical properties, and unfavorable preservation are the main factors contributing to the low gas content of graphitized shale.
Article
Chemistry, Multidisciplinary
Tao Jiang, Zhijun Jin, Hengyuan Qiu, Xuanhua Chen, Yuanhao Zhang, Zhanfei Su
Summary: Through various experiments and analyses, the pore structure and gas-bearing properties of the Jurassic shale in the northeastern Sichuan Basin were studied, resulting in the identification of different lithofacies with varying pore structures. Factors controlling gas-bearing properties were discussed, and a continental shale gas enrichment model was established.
Article
Geochemistry & Geophysics
Jianlin Guo, Chengye Jia, Dongbo He, Fankun Meng
Summary: The study proposed classification criteria for net pay of shale gas reservoirs in the Shunan area of the Sichuan Basin, based on the analysis of porosity, gas saturation, density of rock, brittleness index, and gas content. The application of gas content and brittleness index parameters reflects reservoir resource basis and fracability respectively. The net pay can be classified into three types based on the ranges of these two parameters, with implications for testing production and economic benefits.
Article
Energy & Fuels
Luchuan Zhang, Dianshi Xiao, Shuangfang Lu, Guohui Chen, Tianyu Zhang, Shu Jiang, Lei Chen
Summary: In this study, high-pressure methane adsorption experiments were conducted on shale and kerogen samples from the Lower Longmaxi shale in the Nanchuan area, southeast Sichuan Basin, to investigate the supercritical methane adsorption properties. The results showed that the adsorbed methane density of kerogens obtained from the supercritical Dubinin-Radushkevich (SDR) model may be greater than the liquid methane density. The methane storage capacity was found to decline with increasing burial depth, while the free gas storage capacity showed the opposite trend. The significant contribution of organic matter (OM) to the methane adsorption capacity was attributed to the stronger affinity between kerogens and methane molecules compared to clay minerals (CMs) and whole shales.
Article
Geosciences, Multidisciplinary
Chang Lu, Lei Chen, Cui Jing, Xiucheng Tan, Zhou Nie, Xin Chen, De Heng
Summary: The shale gas reservoirs in the Longmaxi Formation in the Changning area have been found to have rich organic matter and high gas content, with strong adsorption capacity. The Long11-1, Long11-2, Long11-3, and Long11-4 sections are identified as prolific shale gas layers, while the Long12 sub-member has a lower gas content.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Rongze Yu, Wei Guo, Lin Ding, Meizhu Wang, Feng Cheng, Xiaowei Zhang, Shangwen Zhou, Leifu Zhang
Summary: A practical method was proposed to analyze the production performance of horizontal shale gas wells in the Weiyuan Shale Gas Field. The study revealed linear relationships between normalized test production, first-year initial production, and EUR. Productivity factors such as lateral target interval and wellbore integrity greatly influence well productivity. The first-year recovery degree of EUR ranges from 24% to 58%, with a P50 value of 35%.
FRONTIERS OF EARTH SCIENCE
(2021)
Article
Energy & Fuels
Ke Hu, Volker Herdegen, Helmut Mischo
Summary: This study measured and modeled the adsorption behavior of CO2 in shale formations, providing baseline values for carbon sequestration planning. The experimental program involved extracting extractable components from shale using supercritical CO2. The results showed that the total organic carbon content of the shale was the primary factor determining CO2 adsorption and provided useful knowledge for future gas extraction and sequestration projects.
Article
Geosciences, Multidisciplinary
Ziqi Feng, Fang Hao, Jinqiang Tian, Shangwen Zhou, Dazhong Dong, Shipeng Huang
Summary: This review systematically analyzes the geochemical characteristics of Silurian shale gas in the Sichuan Basin, including its special isotope anomalies. The dominant component of over-mature Longmaxi Formation shale gas is methane, with high CH4 and low C2+ contents. The geochemical anomalies mainly refer to abnormally enriched delta C-13(1) values and full reversal, resulting in deviations in carbon isotope composition and light hydrocarbon data. Understanding the geological processes that led to these anomalies provides valuable insights for studying late-stage gas generation.
EARTH-SCIENCE REVIEWS
(2022)
Article
Energy & Fuels
Xiaoyan Zou, Xianqing Li, Jizhen Zhang, Huantong Li, Man Guo, Pei Zhao
Summary: The study found that the porosity and development of organic matter pores in Lower Silurian shale are better than that of Lower Cambrian, with main pore types including interparticle pore, intraparticle pore, organic matter pore, and micro-fracture. Micropores in Lower Cambrian shale provide the major pore volume and specific surface areas.
Article
Chemistry, Analytical
Liang He, Teng-Fei Li, Xin-Sheng Chai, Hui Tian, Xian-Ming Xiao, Donald G. Barnes
ANALYTICAL CHEMISTRY
(2017)
Article
Energy & Fuels
Haifeng Gai, Hui Tian, Xianming Xiao
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2018)
Article
Energy & Fuels
Peng Cheng, Xianming Xiao, Hui Tian, Xing Wang
Article
Geosciences, Multidisciplinary
Haifeng Gai, Hui Tian, Peng Cheng, Qin Zhou, Tengfei Li, Xing Wang, Xianming Xiao
MARINE AND PETROLEUM GEOLOGY
(2019)
Article
Energy & Fuels
Jian Sun, Xianming Xiao, Peng Cheng, Hui Tian
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2019)
Article
Geochemistry & Geophysics
Peng Cheng, Hui Tian, Xianming Xiao, Dehan Liu, Yingzhao Zhang, Baojia Huang, Qin Zhou, Haifeng Gai, Tengfei Li
ORGANIC GEOCHEMISTRY
(2019)
Article
Geography, Physical
Yaowen Wu, Hui Tian, Dajian Gong, Tengfei Li, Qin Zhou
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2020)
Article
Energy & Fuels
Jian Sun, Xianming Xiao, Qiang Wei, Peng Cheng, Hui Tian, Yaowen Wu
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Article
Geosciences, Multidisciplinary
Haifeng Gai, Hui Tian, Peng Cheng, Chunmin He, Zijin Wu, Sui Ji, Xianming Xiao
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Haifeng Gai, Tengfei Li, Xing Wang, Hui Tian, Xianming Xiao, Qin Zhou
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Energy & Fuels
Xing Wang, Hui Tian, Qin Zhou, Chunmin He
Summary: Plenty of pyrobitumens were found in the Sinian Dengying and Cambrian Longwangmiao reservoirs of the Anyue gas field in the central Sichuan Basin. Experimental results show that different oil fractions generate pyrobitumen at different thermal maturity stages during oil cracking, with asphaltenes having the highest yield. The carbon isotopes of pyrobitumen are mainly controlled by the initial carbon isotopes of SARA fractions closely related to source rocks.
Article
Geosciences, Multidisciplinary
Xing Wang, Hui Tian, Xianming Xiao, Dehan Liu, Yushun Min, Tengfei Li, Sui Ji, Ping'an Peng
Summary: This study investigated the occurrence and genetic origins of gaseous inclusions in the Sinian carbonate reservoirs of the Anyue gas field in central Sichuan Basin. By analyzing three types of gaseous inclusions with different compositions and homogenization temperatures, the research traced the oil and gas accumulation history in the region. The findings indicate distinct origins for the gaseous inclusions, providing valuable insights into the evolution of oil and gas reservoirs in the area.
MARINE AND PETROLEUM GEOLOGY
(2021)
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
Geochemistry & Geophysics
Peng Cheng, Botong Liu, Hui Tian, Xianming Xiao, Haifeng Gai, Qin Zhou, Tengfei Li, Dehan Liu, Joseph Curiale
Summary: In this study, pyrolysis experiments were conducted on crude oils with different origins, revealing that the evolution of crude oil fluorescence lifetime is largely controlled by the type and concentration of aromatics in the oils. This fluorescence lifetime can potentially be used to discriminate oils of various origins in petroleum reservoirs.
ORGANIC GEOCHEMISTRY
(2021)
Article
Geosciences, Multidisciplinary
Yaowen Wu, Hui Tian, Jie Li, Tengfei Li, Sui Ji
Summary: The study shows that during the Ediacaran-Cambrian transition, negative delta(98)/Mo-95 values may reflect different reactions between oxygenated waters and sulfidic waters in the ocean. The research also indicates that during this period, the connection between the Yangtze Block and the open ocean changed.
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)
