Article
Energy & Fuels
Ke Li, Kelai Xi, Yingchang Cao, Xiaobing Niu, Songtao Wu, Shengbin Feng, Yuan You
Summary: Authigenic chlorite in tight sandstone reservoirs of the Triassic Yanchang Formation in the Southwestern Ordos Basin, China, is found in two morphotypes: pore-lining and pore-filling chlorite. Pore-lining chlorite from volcanic material alteration has a positive effect on reservoir quality, while pore-filling chlorite precipitated in pore spaces with higher Mg2+ and Fe2+ concentrations and affected by early calcite cementation significantly reduces porosity and permeability at lower temperatures. Systematic studies on authigenic chlorite provide important insights into reservoir heterogeneity and are applicable to tight oil exploration and development.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Shijie Zhao, Qiang Fu, Jinhua Fu, Xianyang Liu, Shixiang Li, Guanyu Zhang, Ji Teng
Summary: This study investigates the densification process of tight sandstone in the Ordos Basin using thin section analysis, HPMI, XCT scanning, and fluid inclusion homogenization temperature. The results show that authigenic clay minerals and carbonate cements play contrasting roles in the evolution of pores and throats, leading to variations in reservoir quality.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Guoping Liu, Lianbo Zeng, Rukai Zhu, Lei Gong, Mehdi Ostadhassan, Zhe Mao
Summary: This study evaluated the effective fractures in deep tight sandstone reservoirs in the Kuqa Depression of the Tarim Basin, and found that tectonic fractures are crucial in these reservoirs, with factors such as filling status, porosity, diagenesis influencing the fracture effectiveness. Effective fractures contribute significantly to the permeability of the reservoir, acting as pathways to improve storage space and determining fluid flow direction.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Patricia Patrier, Daniel Beaufort, Fares Azzam, Thomas Blaise, Eric Portier, Benjamin Brigaud, Sylvain Clerc
Summary: This study focuses on the characteristics and abundance of chlorite in deep sea turbidites and its impact on reservoir quality. The results show that grain replacing chlorite, clay replacing chlorite, and chlorite coatings are observed in both reservoirs but with different textural configurations. These findings are important for understanding the diagenetic process and the influence of material provenance on reservoir properties.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Jing Ba, Hesong Zhu, Lin Zhang, Jose M. Carcione
Summary: This study investigates the influence of complex pore geometry on wave propagation in sandstone media through forced vibration and ultrasonic measurements. The results show that the presence of cracks has a significant impact on the nonlinear behavior of the medium, and the correlations between permeability/ultrasonic velocities and porosity differ. A wave propagation model is developed that accurately predicts the P-wave velocity dispersion and determines the pore aspect ratio spectrum and crack radii. The findings provide important insights into the geophysical properties of reservoir rocks with complex pore geometry.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Thermodynamics
Xiaofeng Zhou, Jianguang Wei, Junfeng Zhao, Xiangyu Zhang, Xiaofei Fu, Sultanov Shamil, Gayubov Abdumalik, Yinghe Chen, Jian Wang
Summary: This paper analyzes the microscale pore-throat structure characteristics of tight oil reservoirs and explores the injection medium sensitivity characteristics. It also elucidates the injection medium influence mode of permeability in tight reservoirs based on the dynamic evolution characteristics of permeability. The results show that tight oil reservoirs have more developed microscale pores and small pores, and acidic fluids have weak improvement on reservoir pore structure but strong improvement on reservoir permeability.
Article
Engineering, Geological
Xiaying Li, Xinglin Lei, Qi Li, Dianguo Chen
Summary: The study investigated the evolution of stress-induced elastic wave anisotropy through triaxial experiments on sandstone specimens with different bedding orientations. The results demonstrated that the anisotropy is sensitive to mechanical loading and depends on the bedding orientation.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Thermodynamics
Weibing Tian, Keliu Wu, Yanling Gao, Jing Li, Zhangxin Chen, Wojciech Stanek
Summary: This study revealed the dynamic contact angle (DCA) effect on imbibition and its impact on enhanced oil recovery in tight reservoirs. The results showed that the DCA effect has four stages of influence on imbibition recovery with time and affects both imbibition velocity and recovery rate.
Article
Geosciences, Multidisciplinary
Hao Wu, Shuyue Ban, Zhiwei Du, Aisheng Hao, Jian Li, Guoliang Wei, Hua Zhang, Yunzhao Zhang, Heng Wu, Mi Li
Summary: Based on petrographic analyses, the lower member of the Middle Jurassic Xishanyao Formation in the Taibei Sag of the Turpan-Hami Basin in northwestern China is an important target for hydrocarbon exploration. The sandstones of this formation are mostly feldspathic litharenites and litharenites, characterized by moderate to good sorting, silty to medium grain size, and point-to-long grain contacts. The sandstones have low porosity and permeability, but show anomalously high porosity/permeability at certain depth intervals. Compaction is the main cause of porosity destruction, but nappe tectonics and well-sorted particles help preserve more intergranular pores. Dissolution further increases porosity and forms anomalously high porosity sandstones.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Yuan Rao, Zhengming Yang, Lijing Chang, Yapu Zhang, Zhenkai Wu, Haibo Li
Summary: The release of dissolved gas in gas-bearing tight oil reservoirs significantly affects development outcomes. By conducting high-pressure mercury intrusion experiments and resistance gradient tests on cores from various areas and lithologies, the study establishes a mathematical model to predict oil production and reveals the differences in porous flow resistance laws between different lithologies. The experimental results indicate that limestone reservoirs exhibit higher resistance gradients compared to sandstone reservoirs during the separation of dissolved gas, impacting oil production significantly.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Yongwei Duan, Boru Chen, Yanpeng Li
Summary: During the acid pressure conversion process in high-temperature, deep oil and gas reservoirs, various challenges are encountered that hinder the effectiveness of acid fracturing. Experimental investigations have been conducted to optimize acid-pressing designs and enhance acid dissolution rates. The findings indicate that the use of specific compounds and acid solutions can significantly improve dissolution and reaction rates.
Article
Energy & Fuels
Chengjin Zhao, Youlu Jiang, Haixing Yang, Liangjun Wang
Summary: This research investigates the diagenetic effects on reservoir quality of the fourth member of the Upper Triassic Xujiahe Formation by integrating various analysis methods. The study determines the origin of authigenic minerals, establishes the porosity evolution model, and discusses the different factors influencing the development of high-quality reservoirs in different lithologies. The findings provide useful insights for deep petroleum exploration in other areas.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Xiangliang Qiu, Li Ding, Junkai Liu, Zhandong Yan, Yanxin Bao, Chengqian Tan
Summary: This study establishes a quantitative evaluation system for reservoir quality suitable for tight oil sandstones using nuclear magnetic resonance, clay mineral analysis, high pressure mercury injection analysis, and logging interpretation technology. The evaluation results are highly consistent with the actual production situation, indicating broad application prospects.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Mohamed Abdel-Fattah, Souvik Sen, Sara M. Abuzied, Mohamed Abioui, Ahmed E. Radwan, Mohammed Benssaou
Summary: This study focuses on the petrographical and petrophysical properties of the upper Miocene Abu Madi Formation in the Nile Delta, confirming the reservoir depositional environment and quality. The research reveals that the sandstone reservoirs in this region exhibit excellent hydraulic properties, while finer-grained sandstones present lower reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Zhiqi Guo, Nanfang Nie, Cai Liu
Summary: Fractures play a vital role in gas accumulation and permeability improvement in tight sandstones. Predicting fracture distribution can provide insights into reservoir quality. Seismic amplitude variation with azimuth can evaluate vertical fractures in sandstones. An improved inversion scheme is proposed to compute anisotropic parameters for fracture characterization. Real data analysis confirms the correlation between fracture density and logging permeability, while fractures and gas enrichment affect the gas production capacity of tight sandstones. Therefore, an integrated indicator is proposed to evaluate reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2022)
