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
Xueyuan Li, Shangbin Chen, Yiwen Wang, Yingkun Zhang, Yang Wang, Jianfa Wu, Junjian Zhang, Jamil Khan
Summary: The pore structure and pore water in deep shale gas reservoirs are unique and have a significant impact on gas occurrence. The development of pores by organic matter controls the connectivity of deep shale. Different burial depths and beds result in significant differences in pore structure, and mineral anti-compaction protection pores and reservoir fluid over-pressure are crucial for the development of organic pores. Primary formation water plays a vital role in the occurrence and enrichment of shale gas.
NATURAL RESOURCES RESEARCH
(2022)
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
Geochemistry & Geophysics
Wei Wang, Dahua Li, Lijun Cheng, Ye Zhang, Jinxi Wang, Zhiping Zhang, Hualian Zhang, Dongxin Guo, Yuelei Zhang, Qing Hua, Jun Liu
Summary: This study provides a comprehensive assessment of the petrophysical characterization and gas accumulation of WL shale in the Sichuan Basin. The results indicate that the bottom section of the WL shale is better suited for hydraulic fracturing and has higher hydrocarbon generation ability and dry gas content.
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
Jian Xiong, Yukang Li, Shangwen Zhou, Xiangjun Liu, Hui Han, Lixi Liang, Jun Zhao
Summary: In this study, the pore structure characteristics of shales and the factors controlling them were analyzed using various methods. The results showed that the main minerals in the shales are quartz and clay minerals, and the organic matter and quartz have a positive influence on the pore structure parameters, while clay minerals have a negative impact. The pore volume and specific surface area of the shales vary within a certain range, with mesopores and macropores contributing the most to the total pore volume and mesopores contributing the main specific surface area.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(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
Or Aimon Brou Koffi Kablan, Tongjun Chen
Summary: In this study, the pore pressure prediction for the Wufeng-Longmaxi shale in the Sichuan Basin was conducted using the Eaton-Yale approach. By integrating various data and modeling techniques, the pore pressure values were determined and overpressure zones were corrected, providing a basis for reservoir simulation models and permeability prediction.
Article
Engineering, Chemical
Chuxiong Li, Baojian Shen, Longfei Lu, Anyang Pan, Zhiming Li, Qingmin Zhu, Zhongliang Sun
Summary: This study quantitatively characterizes the pores and microfractures of marine shale samples from the Longmaxi Formation in the southeastern Sichuan Basin using NMR T-2 spectra analysis. The results show that organic pores are the dominant type of pores, and NMR porosity includes closed pores and microfractures.
Article
Energy & Fuels
Jianchao Cai, Zhenhua Tian, Shangwen Zhou, Yihua Xiong, Chenhao Sun, Jianhui Zeng
Summary: This study focuses on the quantitative characterization of fluid storage and structural properties of deep Longmaxi Formation shale samples from southern Sichuan Basin. Experiments including nuclear magnetic resonance and nitrogen adsorption are conducted to analyze pore distribution complexity and pore surface irregularity, which are controlled by factors such as stratigraphic division and shale composition. The research findings suggest that the storage capacity and microstructural properties of deep shales are influenced by stratigraphic division and shale composition.
Article
Energy & Fuels
Hongming Zhan, Feifei Fang, Xizhe Li, Zhiming Hu, Jie Zhang
Summary: This study used micro-computed tomography, ion beam scanning electron microscopy, and small-angle neutron scattering to investigate the pore distribution of shale in the Longmaxi Formation in the Luzhou block of southern Sichuan. The results showed that shale micropores are dominated by microfractures along the bedding direction and contribute 1.24% of porosity. Shale nanopores are more developed, contributing 3.57-4.72% porosity, with local heterogeneity at the microscale but lateral homogeneity and vertical heterogeneity at the macroscale.
Article
Energy & Fuels
Yang Zhou, Lijun You, Yili Kang, Qiuyang Cheng, Nan Zhang
Summary: This study explores the impact of oxidative stimulation on the mechanical properties and permeability of shale gas reservoirs, finding that it can positively affect the matrix and fracture conductivity of shale.
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
Geosciences, Multidisciplinary
Weihang Zhang, Rui Yang, Zhiliang He, Hanyong Bao, Hui Yu, Shuling Xiong, Yuanjia Han, Qinhong Hu, Sheng He
Summary: This study investigates the influence of mineral composition, pore structure, and extractable organic components on the wettability of shale. The results demonstrate that shale with different lithofacies have different wettability characteristics, and minerals and pore types play a significant role in wettability alteration.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Li Li, Jun Liu, Wei Wang, Peng Zhao, Yang Lu
Summary: This study evaluated the mineralogy, lithology, organic matter geochemistry, and trace element analyses of the Wufeng-Longmaxi formation in three parameter wells. The results showed differences in sedimentary environment, organic matter preservation conditions, and hydrocarbon generation capacity among the wells. This provides useful information for shale gas development from the same formation but sedimented from different locations.
Article
Energy & Fuels
Liang Wang, Ning Zhao, Liqiang Sima, Fan Meng, Yuhao Guo
Article
Geochemistry & Geophysics
Kai Zhu, Liang Wang, Yonghui Du, Cong Jiang, Zhongwei Sun
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2020)
Article
Geochemistry & Geophysics
Chang Li, Liqiang Sima, Guoqiong Che, Wang Liang, Anjiang Shen, Qingxin Guo, Bing Xie
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2020)