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
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
Chemistry, Multidisciplinary
Yanran Li, Xiangui Liu, Changhong Cai, Zhiming Hu, Bo Wu, Ying Mu, Xianggang Duan, Qingxiu Zhang, Shuti Zeng, Jingshu Guo, Zhijin Pu
Summary: This study investigates the pore characteristics of deep shale in the LZ region of southern Sichuan using various methods. The results show that the pores can be classified into four categories and the total pore volume is dominated by mesopores. The factors that influence pore structure include buried depth, geochemical factors, and mineral composition.
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
Tao Wang, Fenghua Tian, Ze Deng, Haiyan Hu
Summary: The microscopic pore characteristics of shale in marine strata in northern Yunnan and Guizhou were evaluated using FE-SEM, LT-N(2)GA, LP-CO(2)GA, and HPMA experiments. Fractal Frenkel-Halsey-Hill theory was used to analyze the fractal characteristics and discuss the adsorption pore characteristics of shale. The results showed that the shale samples had complex pore structures and open pore styles, with abundant micropores and mesopores. The fractal dimensions were positively correlated with the TOC and clay mineral contents and negatively correlated with the quartz content. Fractal analysis is helpful for understanding the pore structure and adsorption capacity of shale gas reservoirs.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Kunpeng Zhang, Mian Chen, Shiguo Wang, Jiaxin Li, Muhammad Taufiqurrahman
Summary: This paper analyzes the significance of formation parameters on hydraulic fracturing and presents conclusions on the influence of factors such as breakdown pressure, stimulated reservoir volume (SRV), and fracture morphology. The research is based on experimental design and numerical simulation experiments using the extended finite element method (XFEM).
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
Di Wu, Feng Miao, Xueying Liu, Xiaochun Xiao, Wenbo Zhai
Summary: The study confirmed the effectiveness of Langmuir, SDR, and SLD models in predicting high-pressure adsorption, with the SLD model showing stronger predictive capability.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Geosciences, Multidisciplinary
Tonglou Guo, Xianghao Meng, Wei Lei, Mingming Liu, Liang Huang
Summary: This study conducted systematic experimental characterization to understand the pore structures and methane sorption in deep-marine shales. The results showed that factors such as organic matter content and clay minerals affect the pore structures and sorption behaviors in deep shales. The findings also indicate that deep shales have higher micropore content from organic matter and lower macropore content from clay minerals compared to shallow shales. The total organic carbon (TOC) content is the primary controlling factor on pore structure and sorption capacity in deep shales, while the influence of clay minerals on gas sorption is less pronounced.
NATURAL RESOURCES RESEARCH
(2023)
Article
Energy & Fuels
Jing Liu, Yanming Zhu, Fuhua Shang, Guangjun Feng, Yu Liu, Bin Gao, Shike Li, Fenfen Kuang
Summary: Pore structure is crucial for the preservation and migration of shale gas. This study investigated the pore structure of shale samples from two formations in northeastern Chongqing using image analysis and fluid injection, and examined their porosity, homogeneity, and roughness through various fractal methods. The results revealed that the Lujiaping Formation shale had more developed organic matter pores, smaller macropore volumes, and larger micropore volumes compared to the Longmaxi Formation shale. Moreover, the Lujiaping Formation shale exhibited stronger heterogeneity and more complex morphology. The poor prospects of shale exploitation in the Lujiaping Formation may be attributed to pore shrinkage in the micrographitization stage.
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
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
Thermodynamics
Chao Qin, Yongdong Jiang, Yong Fu, Shiwan Chen, Xiao Song, Shuangying Zuo, Daoyong Wu, Niuniu Zou
Summary: The interaction between shale and methane after supercritical CO2 injection can be explained well by adsorption thermodynamics study. Experimental results showed that the adsorption capacity of shale to methane decreased after supercritical CO2-water saturation, mainly due to the decrease in specific surface area of shale. The thermodynamic parameters, including isosteric heat of adsorption, enthalpy change, Gibbs free energy change and entropy change, also varied with adsorption capacity and temperature, indicating that supercritical CO2-water-shale interaction can enhance shale gas recovery from the perspective of thermodynamics.
Article
Geosciences, Multidisciplinary
Yijun Zheng, Yuhong Liao, Yunpeng Wang, Yongqiang Xiong, Ping'an Peng
Summary: Changning and Fuling are two well-known shale gas fields in China with significant differences in gas content. This study investigates the mineralogical and petrophysical properties of the Wufeng-Longmaxi shales in these two areas and compares them with the Jiaoye 4 well from the Fuling field. The results show that carbonate cementation and tectonic deformation are key factors affecting the gas content in these shale reservoirs.
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
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
Energy & Fuels
Weilong Peng, Quanyou Liu, Ziqi Feng, Chenchen Fang, Deyu Gong, Peng Li, Yue Lyu, Pengwei Wang
Article
Geography, Physical
Rui Zhang, Zhijun Jin, Quanyou Liu, Peng Li, Zhenkai Huang, Juye Shi, Yunjin Ge, Kefeng Du
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Yuewu Sun, Xiang Li, Quanyou Liu, Mingda Zhang, Peng Li, Rui Zhang, Xiao Shi
GEOLOGICAL JOURNAL
(2020)
Article
Energy & Fuels
He Bi, Peng Li, Yun Jiang, Jing-Jing Fan, Xiao-Yue Chen
Summary: This study focused on the Upper Cretaceous Qingshankou Formation, Yaojia Formation, and the first member of the Nenjiang Formation in the Western Slope of the northern Songliao Basin. It analyzed the geochemical parameters and conducted one-dimensional basin modeling and hydrocarbon evolution to discuss the effectiveness of source rocks. Through biomarker characteristics, oil-source correlations were assessed, revealing different organic matter sources and thermal evolution degrees in Gulong and Qijia source rocks.
Article
Geosciences, Multidisciplinary
Quanyou Liu, Peng Li, Zhijun Jin, Xinping Liang, Dongya Zhu, Xiaoqi Wu, Qingqiang Meng, Jiayi Liu, Qi Fu, Jianhua Zhao
Summary: The study highlights the significant impact of sulfate reduction on organic matter preservation, with higher SRI values leading to extensive organic matter consumption and lower SRI values resulting in minimal degradation effects.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Peng Li, Zhongbao Liu, Haikuan Nie, Xinping Liang, Qianwen Li, Pengwei Wang
Summary: The lacustrine shale in the Dongyuemiao Member of the Fuling area, Sichuan Basin, exhibits heterogeneity in terms of porosity and permeability, with mixed shale having better physical properties than argillaceous shale. Factors controlling the development of main pores include total organic carbon, clay minerals, and organic-inorganic interactions during diagenesis and hydrocarbon generation.
FRONTIERS IN EARTH SCIENCE
(2021)
Review
Geosciences, Multidisciplinary
Quanyou Liu, Peng Li, Zhijun Jin, Yuewu Sun, Guang Hu, Dongya Zhu, Zhenkai Huang, Xinping Liang, Rui Zhang, Jiayi Liu
Summary: The study focused on the impact of volcanic activity on paleoproductivity and preservation conditions in lacustrine shale formation. The results indicated that volcanic activity enhanced ancient productivity and promoted organic matter preservation.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Peng Li, Zhongbao Liu, He Bi, Jun Liu, Min Zheng, Guoqiang Wu, Ruikang Bian, Pengwei Wang
Summary: This study analyzed the pore-throat structure characteristics of the Chang 7 member in the Ordos Basin in China using nuclear magnetic resonance and high-pressure mercury intrusion experiments. The results showed that the pore-throat structure parameters are influenced by pore size distribution and exhibit obvious piecewise fractal characteristics. The study provides important insights for the effective development of shale oil and gas exploration.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2022)
Article
Geochemistry & Geophysics
Peng Li, Zhongbao Liu, He Bi, Jingjing Fan, Rui Zhang, Zhenkai Huang, Ruikang Bian, Pengwei Wang
Summary: This study explores the oil content and its controlling factors of shale in the Chang 7 member of the Yanchang Formation in the Ordos Basin. The results show that the shale exhibits organic heterogeneity and can be divided into upper and lower shale. The upper shale has low total organic carbon and slightly low oil content, but good mobility. The lower shale has high total organic carbon and good oil content, but poor mobility. The organic carbon content and type in the shale have a significant control effect on oil bearing and mobility.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2022)
Article
Geosciences, Multidisciplinary
Qianwen Li, Zhongbao Liu, Feiran Chen, Guangxiang Liu, Dianwei Zhang, Peng Li, Pengwei Wang
Summary: Comprehensive analysis of the Jurassic Da'anzhai Member shale strata in the northeastern Sichuan Basin reveals the organic geochemical characteristics, organic matter provenance, and sedimentary environment. The J(1)da(2) section is identified as the most favorable for hydrocarbon enrichment. The organic matters in the J(1)da shale strata are derived from both terrestrial higher plants and lower aquatic organisms, suggesting a freshwater lacustrine environment overall.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Wang Zhang, Zhijun Jin, Quanyou Liu, Xiaocai Shan, Peng Li, Xinping Liang
Summary: This study investigates the importance of Dissimilatory Iron Reduction (DIR) and Bacterial Sulfate Reduction (BSR) in the preservation of organic matter in ancient continental lakes. The results show that the BSR triggered by exogenous sulfate input contributes to the preservation of organic matter in anoxic lake basins. The study also reveals the dynamic evolution of the interaction between BSR and DIR through the components of reactive irons.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
H. K. Nie, Q. Chen, P. Li, W. Dang, J. C. Zhang
Summary: The assessment of shale gas potential in the northwest margin of Ordos Basin in China focused on the Ordovician Pingliang Formation and Carboniferous-Permian Taiyuan and Shanxi formations. The study revealed the impact of fluctuating depositional environments on lithofacies and shale gas potential. By conducting various tests on representative samples, it was found that the Pingliang shale is a 'poor' source rock, while the transitional Taiyuan-Shanxi shales are characterized as 'fair' source rocks, with some samples showing good potential. The sedimentary environment plays a crucial role in the type and content of minerals in shale and ultimately controls the shale gas potential.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Rui Zhang, Zhijun Jin, Michael Gillman, Quanyou Liu, Ren Wei, Peng Li, Zhihui Zhang
Summary: Mounting evidence shows that the orbital period of the solar system's movement through the Milky Way has a controlling effect on Earth's system throughout the Phanerozoic. In this study, long-term cycles recorded in the Mesozoic Ordos Basin (Central China) are reported for the first time to decipher the response of terrestrial basin's rhythms to galactic dynamics. The analysis reveals compelling periodicities of 93, 33, 9, 3-5, and 2.4 million years.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Huiyuan Xu, Quanyou Liu, Zhiquan Li, Dujie Hou, Xu Han, Peng Li, Pengpeng Li, Biqing Zhu
Summary: This study investigates the role of autotrophy and heterotrophy in the cycling/export of organic carbon in the shale or mudstone source rocks from the Chang 3 to 7 members of the Yanchang Formation. The results indicate that the Chang 7 member has higher quality and total organic carbon than other members. The shift in carbon cycling/export mode and dominant heterotrophic bacterial activity in the Chang 7 member improve organic carbon preservation. Rating: 7 out of 10.
Article
Geochemistry & Geophysics
Wang Zhang, Xinping Liang, Peng Li, Guoheng Liu, Jin Qian
Summary: Significant amounts of unconventional oil and gas resources have been discovered in the Yanchang Formation of Ordos Basin, primarily sourced from the shale layers in Chang 7 and 9 members. The C7-3 submember shale has the highest content of illite/smectite mixed layer and reducing minerals, while the C9 member shale has the highest percentage of quartz and illite. The C7-3 submember shale is characterized by high productivity due to type II1 kerogen, and the C9 member shale exhibits the highest organic thermal maturity.