Article
Geosciences, Multidisciplinary
Jingdong Liu, Lei Li, Cunjian Zhang, Youlu Jiang, Rudy Swennen, Chengjin Zhao, Shuai Hou
Summary: This study investigates the pore structure and fluid flow behavior in tight sandstone reservoirs of the Upper Triassic Xujiahe Formation in the northern Sichuan Basin. Different types of sandstones possess different pore-throat systems, with clay mineral-related pores and throats being the key factors affecting the pore structure and fluid flow behavior. The findings provide valuable insights for reservoir characterization and development.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Jingdong Liu, Cunjian Zhang, Youlu Jiang, Shuai Hou
Summary: The pore structure of ultra-tight reservoirs plays a key role in controlling quality and fluid flow. The relationship between pore types and rock types was identified, with different types of sandstone reservoirs having distinct pore characteristics. High-pressure mercury intrusion and fractal theory were used for quantitative assessment.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Juncheng Qiao, Jianhui Zeng, Dongxia Chen, Jianchao Cai, Shu Jiang, Enzhao Xiao, Yongchao Zhang, Xiao Feng, Sen Feng
Summary: This study improves the estimation models for permeability in tight gas sandstone by characterizing different pore structures and considering structure types and connectivity. The research highlights the significant impact of pore structure types on permeability, with connectivity playing a secondary role.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Quanpei Zhang, Yicang Liu, Botao Wang, Jinfeng Ruan, Na Yan, Hua Chen, Qin Wang, Gangwei Jia, Ruinan Wang, Hong Liu, Chengwei Xue, Feilong Liu, Huan Yang, Yushuang Zhu
Summary: The pore-throat structure of tight sandstone reservoirs plays a crucial role in determining the mobility of reservoir fluids, with different pore-throat structure types having significant impact on the saturation and permeability of movable oil.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Xian Shi, Caiyun Xiao, Hongjian Ni, Qi Gao, Lei Han, Dianshi Xiao, Shu Jiang
Summary: In order to apply supercritical carbon dioxide (ScCO2) fracturing on tight sandstone properly, the effects of ScCO2 on pore structure were investigated. ScCO2 treatment was applied to three sets of tight sandstone samples, and the pore structure was characterized using high-pressure mercury intrusion porosimetry and nuclear magnetic resonance. The results showed that after SCCO2 treatment, the number of transitional pores decreased significantly, while the number of mesopores and macropores increased. The fractal dimension characteristics indicated that the pore structure became more complicated and heterogeneous, and large pores had a higher fractal dimension than small pores. The content of calcite sharply decreased while clay, feldspar, and plagioclase content had a slight drop after ScCO2 treatment, affecting the alternation of pore structure. Thus, the accumulative pore volume and pore connectivity do not always increase after ScCO2 exposure due to potential pore and channel clogging from re-precipitation and fine migration.
Article
Energy & Fuels
Feng Wu, Yang Li, Brian Burnham, Zeyu Zhang, Cong Yao, Long Yuan, Fengsheng Zhang, Haoyang Deng, Yanping Xi, Jiang He
Summary: Permeability is a crucial parameter for evaluating tight sandstone reservoirs. This study introduces a fractal dimension based nuclear magnetic resonance (NMR) permeability estimation method for tight sandstone in the Sichuan Basin, China. The proposed models show higher accuracy and easy implementation, providing more accurate predictions of permeability for tight sandstone.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Zhang Miao, Wang Jindong, Fu Xuehai, Lu Haifeng, Dong Zhiyong, Li Lirong, Wang Hao
Summary: By studying the physical properties and pore structures of Carboniferous-Permian (C-P) tight sandstone reservoirs, the multifractal characteristics of pore structures and their relationships with lithologic parameters were revealed.
NATURAL RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Weile Geng, Jiandong Wang, Xuecai Zhang, Jun Wang, Chenqiang Dong, Guangqing Zhou, Gun Huang, Lin LI
Summary: In this study, the influence of acid treatment on pore structure and fractal characterization of tight sandstones was investigated using X-ray diffraction, N-2 adsorption, and mercury intrusion experiments. The results showed that acid treatment generated ink-bottle pores in fine sandstone, aggravated the ink-bottle effect in sandy mudstone, and transformed smaller pores into larger ones. Pore volume significantly increased after acid treatment, and the fractal dimension was positively correlated with acid treatment time. The results provide guidance for reservoir acidification stimulation.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2023)
Article
Physics, Multidisciplinary
Xuechao Liu, Dazhong Ren
Summary: This study investigates the influence of pore geometry on pore analysis using digital cores. The results show that pore analysis based on digital cores differs significantly from experimental results, mainly due to limitations of scanning resolution, quality, pore extraction method, and experimental errors.
FRONTIERS IN PHYSICS
(2022)
Article
Energy & Fuels
Dengke Liu, Dazhong Ren, Kun Du, Yiru Qi, Feng Ye
Summary: This research reveals that hydrophilic minerals can increase imbibition efficiency, and the development of tiny pores makes oil more easily replaced. Additionally, the enhancement of pore connectivity can also promote spontaneous imbibition.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Jian-Yong Xie, Jun-Jie Zhang, Wei Xiang, Yan-Ping Fang, Ya-Juan Xue, Jun-Xing Cao, Ren-Fei Tian
Summary: This study investigates the relationship between microcosmic details of pore structure and elastic properties in tight sandstone reservoirs. The results show that pore connectedness, pore type, and grain size have different effects on elastic properties. The study also reveals the sensitivity of elastic properties to variations in pore fluid saturation and confining pressure. These findings are important for improving the precision of seismic reservoir prediction in tight sandstone reservoirs.
Article
Energy & Fuels
Yongqiang Xu, Linyu Liu, Yushuang Zhu
Summary: By analyzing the occurrence characteristics of movable fluids in tight sandstone reservoirs using nuclear magnetic resonance and microscopic experiments, it was found that movable fluids are mainly distributed in medium and large pores, and the size of throats and connectivity of pore-throat have significant effects on fluid saturation.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Chaozheng Li, Xiangbai Liu, Fuliang You, Peng Wang, Xinluo Feng, Zhazha Hu
Summary: This study evaluates the pore structure of the Chang 7 tight sandstone reservoir using mercury injection capillary pressure (MICP) and low-field nuclear magnetic resonance (NMR). The results show that MICP and NMR techniques provide different profiles of pore structure, which are related to lithology and pore network characteristics.
Article
Geosciences, Multidisciplinary
Zhenghong Li, Liqiang Zhang, Wenfang Yuan, Xi Chen, Liang Zhang, Mingqiang Li
Summary: The Ahe Formation in the Kuqa Depression of Tarim Basin is characterized by poor reservoir quality and strong heterogeneities. In this study, "diagenetic facies" are introduced and four types are categorized based on reservoir spaces, diagenetic minerals, and diagenesis. Petrophysical characteristics are summarized, and it is found that dissolution facies and microfracture facies have higher porosities and permeabilities. Principal component analysis (PCA), linear discriminant analysis (LDA), and back propagation neural networks (BPNN) are compared for diagenetic facies identification, with BPNN achieving the highest accuracy. The trained BPNN model is effective for diagenetic facies identification based on conventional well logs.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Linjie Feng, Yuqiang Jiang, Guian Guo, Changcheng Yang, Xun Zhu, Qinggao Zeng, Guangyin Cai, Zhanlei Wang
Summary: This study comprehensively analyzed the quality, pore structure, and fractal characteristics of tight sandstone reservoirs in meandering stream facies through various tests and experiments. The results revealed the relationships between physical properties, pore geometry, topological parameters, fluid mobility, and pore system heterogeneity. It was found that the study area has developed tight sandstone reservoirs with different pore characteristics, including different pore radii, tortuosities, and movable fluid saturations. The fractal dimensions of small and large pores were calculated and found to effectively characterize the reservoir pore heterogeneity.
FRONTIERS IN EARTH SCIENCE
(2023)