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
Shunlin Tang, Yuxiang Ding, Guangyou Zhu, Xinbin Feng, Huaishun Zhang, Penggao Li
Summary: Little is known about the non-traditional stable isotopes of mercury in natural gas, especially in shale gas. This study extracted mercury from shale gas in the Sichuan Basin and analyzed its content and stable isotope composition. The results suggest that terrestrial target strata with abundant algae may be the target for terrestrial oil and gas exploration.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Environmental
Wenbin Jiang, Gaohui Cao, Chao Luo, Mian Lin, Lili Ji, Ji Zhou
Summary: The study investigated the relationship between the composition of Wufeng-Longmaxi Formation shale samples in Sichuan Basin and methane adsorption characteristics, establishing a composition-based methane adsorption model. Differences in clay contribution to methane adsorption for different sublayers were revealed, aiding in improving the accuracy of shale reservoir evaluation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Wenping Liu, Juan Wu, Hua Jiang, Zheng Zhou, Chao Luo, Wei Wu, Xiaojia Li, Shugen Liu, Bin Deng
Summary: This study examines the relationship and multi-stage evolution between the upper Ordovician Wufeng and lower Silurian Longmaxi formations at the Changning shale gas field in southern Sichuan basin. The research utilizes low-temperature thermochronological data and structural evolution to analyze the rapid exhumation and history of the field. The results suggest a four-stage thermal evolution and significant impact of pressure index changes on shale gas enrichment.
MARINE AND PETROLEUM GEOLOGY
(2021)
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
Zhongliang Ma, Jingqiang Tan, Lunju Zheng, Baojian Shen, Zhanghu Wang, Asim Shahzad, Irfan U. Jan, Hans-Martin Schulz
Summary: The study evaluated the generation and preservation potential of shale gas in the Wufeng-Longmaxi Formation shale by conducting semiclosed hydrous pyrolysis experiments, finding that retained oil is the primary source of gas and a TOC content of 1.5% meets the evaluation standard for favorable marine shale gas play areas in China.
MARINE AND PETROLEUM GEOLOGY
(2021)
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
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, Geological
Chengxing Zhao, Jianfeng Liu, Deng Xu, Liangquan Zhang, Cheng Lyu, Yi Ren
Summary: This study analyzed the mineral composition and microstructure of outcrop shale matrix and discussed the effect of anisotropy on shale deformation, strength, and failure characteristics. The acoustic emission (AE) evolution was used to characterize shale brittleness, and a new brittleness indicator BInew was proposed. The relationship between AE characteristics, brittleness, and failure modes of shale was elaborated.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
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
Wenbiao Li, Junqian Li, Shuangfang Lu, Guohui Chen, Xiaoting Pang, Pengfei Zhang, Taohua He
Summary: Gas-in-place content and gas-adsorbed ratio are crucial parameters for resource potential assessment and production strategy optimization in unconventional gas resources. The carbon isotope fractionation model provides a powerful tool in evaluating the mechanism of isotopic fractionation during natural gas transport. The study in the Jiaoshiba area of China showed a positive correlation between methane degassing volume and TOC content, and an underestimation of shale gas resources by the traditional USBM method.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Yanhua Shuai, Yongqiang Xiong, Jian Li, Wei Wu, Guoyi Hu
Summary: Abiotically synthesized hydrocarbons have significant implications in various fields, but identifying them in common sediments is challenging. This study found distinct isotopic depletion in the central carbon of propane, indicating the occurrence of surface catalyzed polymerization reactions of methane in commercial gas reservoirs.
ORGANIC GEOCHEMISTRY
(2023)
Article
Engineering, Marine
Zhibo Zhang, Yinghai Guo, Hengye Wei, Chunlin Zeng, Jiaming Zhang, Difei Zhao
Summary: The Late Ordovician-Early Silurian period in the Sichuan Basin was a significant transitional phase in geological history. This study focused on the black shale series of the Wufeng Formation-Longmaxi Formation during this period. Analysis of samples from the Yucan-1 Well revealed three third-order sequences and identified two subfacies and three microfacies. The climate during this period experienced shifts from warm and humid to cold and dry, with corresponding pulse-type biological extinction events and changes in organic carbon burial.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Xingxing Kong, Shuangfang Lu, Dianshi Xiao, Hongjun Fan, Pengfei Mu, Shu Jiang
Summary: Shale gas resources provide new impetus for alleviating the contradiction between China's oil and gas supply and demand. Understanding the occurrence mechanism of adsorbed gas can help in the better development and utilization of shale gas resources. The experiments conducted in this study revealed that nanopores dominate shale pores, with Total Organic Carbon (TOC) playing an important role in controlling specific surface area and methane adsorption capacity. Micropores in organic matter provide the main specific surface area and adsorption sites for methane adsorption, which is mainly multilayer adsorption and micropore filling in shale.
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.