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
Geosciences, Multidisciplinary
Yanqi Zhang, Li Liu
Summary: This study investigates the water content variation in Longmaxi marine organic-rich shale reservoir, revealing the formation mechanism of low water saturation. The results show that water saturation is correlated with organic and inorganic components of the shale, and varies with the history of gas generation and expulsion.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Energy & Fuels
Qiyang Gou, Shang Xu, Fang Hao, Zhiguo Shu, Zhiyao Zhang
Summary: The study analyzed the types and characteristics of microfractures in Longmaxi shales and their impact on shale gas enrichment, showing that microfracture characteristics are mainly controlled by mineral composition.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Xianglu Tang, Zhenxue Jiang, Yan Song, Qun Luo, Zhuo Li, Guozhen Wang, Xingmeng Wang
Summary: This study systematically summarizes the understanding of shale gas accumulation mechanisms, providing important guidelines for shale gas exploration in the Sichuan Basin. It reviews the formation process of methane in shale and analyzes the evolution of organic and mineral pores, as well as the migration mechanisms of shale gas.
Article
Geosciences, Multidisciplinary
Weidong Xie, Si Chen, Huajun Gan, Hua Wang, Meng Wang, Veerle Vandeginste
Summary: This study investigates the dynamic evolution of shale gas generation, accumulation, adjustment, and loss in the Longmaxi formation (S(1)l) in the Changning area, southern Sichuan Basin, China. It also explores the factors controlling the preservation conditions and formation mechanism of overpressure shale gas reservoirs. The findings reveal the peak generation period of shale gas, the main occurrence of gas, and the damage to the reservoir. Additionally, an evaluation scheme for shale gas reservoirs is established, dividing them into four grades based on various parameters.
GEOSCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Xiuquan Hu, Wanli Yu, Chi Yi, Chenjing Xiao, Jianghan Li, Boqiang Wang
Summary: This study establishes a rock physical model and predicts quality parameters for shale gas exploration and development in the WY area. The results show a good correlation between shale reservoir quality parameters and seismic parameters. This study provides valuable insights and guidance for fracturing and well location deployment.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Lei Chen, Xin Chen, Xiucheng Tan, Jian Zheng, Yang Yang, Cui Jing, Hao Zhou, Gaoxiang Wang
Summary: This study examined organic matter accumulation and controlling factors of the Longmaxi Formation shale in the Changning area, southern Sichuan Basin, based on TOC tests and major-trace element test data. The results showed that redox conditions, paleoproductivity, and terrigenous input were the main factors controlling organic matter accumulation in this area. These findings are expected to contribute to shale gas exploration and development.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
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
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
Geosciences, Multidisciplinary
Yi Shu, Yongchao Lu, Qinhong Hu, Chao Wang, Qiming Wang
Summary: In recent years, lithofacies identification and classification have been a hot topic in shale gas research. This study systematically reveals the lithofacies distribution and reservoir characteristics in the transgressive systems tract (TST) section. Different units show variations in pore structure and lithofacies types, with mineral composition playing a key role. TOC is important in the development of organic matter pores, influenced by anoxic bottom water conditions and high paleo-salinity.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Guoliang Xie, Weiduo Hao
Summary: This study investigated different organic matter pores in the Longmaxi Formation shales in the Sichuan Basin using optical microscope, SEM, and adsorption experiments. The results showed that pyrobitumen and quartz-rich brittle shale play significant roles in pore development, while pores in organic matter like microorganisms and algae are mainly mesopores.
Article
Energy & Fuels
Zhonghua Liu, Baojun Bai, Jing Tang, Zuping Xiang, Shunpeng Zeng, Hai Qu
Summary: The study focused on the importance of gas shale permeability reduction in shaping gas production from shale gas reservoirs. Through experiments, it was found that microfractures significantly impact the flow of slickwater in the core, with the cumulative gas volume increasing linearly over time. The research also highlighted the effects of injection pressure gradients, injection volumes, and slickwater compositions on permeability reduction and flowback efficiency.
Article
Multidisciplinary Sciences
Shengling Jiang, Qinghua Zhou, Yanju Li, Rili Yang
Summary: This paper discusses the fracability of shale reservoirs in the HD1 well through various methods. The results show that the Gufeng-Dalong Formation in the well has organic-rich shale, favorable for fracture development. However, the presence of shale bedding fractures has a negative impact on fracture generation and should be considered in fracturing design.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Geological
L. Ren, H. P. Xie, X. Sun, R. Zhang, C. B. Li, J. Xie, Z. T. Zhang
Summary: The study investigates the fracture properties of Lower Silurian Longmaxi shale by conducting three-point bend tests in three principal fracture orientations. The results show the critical shape coefficient depends on the anisotropic elasticity of the investigated shale, and using a critical shape coefficient for isotropic rock could lead to a maximum error in the calculated fracture toughness. Additionally, the mode I fracture toughness varies across different fracture orientations, with a progressive decrease in fracture energy observed.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Energy & Fuels
Shengxiu Wang, Jia Wang, Yuelei Zhang, Dahua Li, Weiwei Jiao, Jinxi Wang, Zhian Lei, Zhongqiang Yu, Xiaojun Zha, Xianfeng Tan
Summary: Through organic geochemical and reservoir characteristic analysis, the features of the Wufeng-Longmaxi formation shale and reservoir characteristics were identified. The study revealed a positive correlation between TOC and quartz content, and a positive correlation between porosity and clay mineral content. Therefore, shale with high TOC content, high clay mineral content, and suitable quartz content is the most favorable interval for shale gas exploration and development.
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)