Article
Multidisciplinary Sciences
Jingling Xu, Ruotao Wang, Ling Zan, Xiaoguang Wang, Jiaqing Huo
Summary: This study proposed an efficient method for identifying and characterizing fractures in tight sandstone reservoirs. By analyzing the log response characteristics and constructing logging eigenvalue and rock physical eigenvalue models, different fractures were accurately identified and characterized. This method is of great significance for the research of fine reservoir evaluation and fracture theory.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
Ke Xu, Hui Zhang, Haiying Wang, Zhimin Wang, Guoqing Yin, Xiaoxue Wang, Tingting Kang, Li Huang, Zhaohui Wang, Wei Zhao
Summary: The study reveals that the Cretaceous reservoirs in the Bozi gas field in the Kuqa Depression generally contain high-angle shear fractures, with fracture development controlled by local structures such as folds and faults, and fracture activity showing significant regional differences with changes in geological structure.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Jiuyu Zhao, Fuyong Wang, Jianchao Cai
Summary: Research shows that the method based on deep convolutional generative adversarial network (DCGAN) can accurately reconstruct the 3D digital rock model of tight sandstones, which is consistent with the characteristics of natural tight sandstones. Furthermore, by training with multiple 3D tight sandstone CT images, the DCGAN can learn the pore structure features of the entire tight sandstone bodies.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Wei Zhu, Shangxu Wang, Xu Chang, Hongyu Zhai, Hezhen Wu
Summary: Through hydraulic fracturing experiments, the study investigated the hydraulic fracturing mechanism of tight sandstone under high differential stress, revealing the fracture evolution processes of hydraulic fracturing.
APPLIED SCIENCES-BASEL
(2021)
Article
Geosciences, Multidisciplinary
Zhanjun Chen, Anzhao Ji, Yidong Yuan
Summary: Using a fractal model, this paper identifies fractures in tight oil reservoirs by utilizing core and logging data, with the Upper Triassic Yanchang Formation as an example. The results show that high-angle, vertical, and bedding fractures are mainly developed in the tight sandstones of the Yanchang Formation. There is a negative correlation between sand body thickness and fracture development degree. The study also found that the content of brittle mineral components in sandstone is an important factor affecting the development degree of natural fractures.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Lei Liu, Jun Yao, Hai Sun, Lei Zhang, Kai Zhang
Summary: Studying the influence of fractures on the rock topological structure and flow characteristics in tight sandstone reservoirs is crucial. This study utilizes digital rock analysis technology to reveal the impact of fracture aperture and length on pore throat structure, permeability, and fluid flow in different directions. The findings highlight the importance of fracture characteristics in determining the properties and behavior of tight sandstone reservoirs and showcase the usefulness of digital rock analysis technology in understanding complex microstructures.
APPLIED SCIENCES-BASEL
(2023)
Article
Geosciences, Multidisciplinary
Xiangye Kong, Jianhui Zeng, Xianfeng Tan, Kun Ding, Qun Luo, Qianyou Wang, Ming Wen, Xin Wang, Maoyun Wang
Summary: This study investigated natural tectonic fractures in tight oil reservoirs in the Junggar Basin, China. Different stages of fracture development showed varying calcite filling temperatures, with Stages 2-4 having minimal calcite fillings, which are favorable for oil and gas migration and accumulation.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Ye Liu, Qidi Zhang, Nan Zhang, Jintao Lv, Meichen Gong, Jie Cao
Summary: This study aims to improve the segmentation and classification of rock images in order to accurately characterize the properties of rock and fluid in oil reservoirs using the super-resolution technique. The resolution of the images is enhanced through a GAN-based SR model, and the effectiveness of the technique is evaluated in the segmentation and classification processes. The results show that super-resolution allows for the accurate segmentation of tiny minerals, pores, throats, and other blurry edges, and significantly improves the classification accuracy. The study demonstrates the importance and advantages of super-resolution in rock image analysis.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Shuo Qin, Ren Wang, Wanzhong Shi, Kai Liu, Wei Zhang, Xiaofeng Xu, Rong Qi, Zhixing Yi
Summary: This study investigates the morphology and development characteristics of intragranular fractures in the He-1 Member tight sandstones in the Hangjinqi area, and their effects on physical properties, reservoir diagenesis, and gas migration. The results show that intragranular fractures greatly enhance permeability but have limited direct contribution to total porosity. The study is important for guiding the evaluation and exploration of tight sandstone reservoirs in the Ordos Basin and other basins with similar settings around the world.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Malgorzata Slota-Valim, Anita Lis-Sledziona
Summary: Geomechanical characterization is crucial for optimizing stimulation treatment of tight reservoir formations. Petrophysical models help classify reservoir rocks and determine hydrocarbon-saturated zones. Well-log data aids in determining relationships between borehole parameters and physical rock properties in 3D space, supported by seismic data. This study in North Poland reveals brittleness heterogeneity and fracturing pressure variations in Middle Cambrian sediments.
Article
Geosciences, Multidisciplinary
Yasser Taras, Mohammad Ali Riahi
Summary: The main objective of this study is to identify hydrocarbon-bearing zones in a reservoir layer using a combination of geomechanical parameters. A two-step assessment procedure was designed and applied to seismic data and well information. In the first step, integrated attributes were obtained through simultaneous inversion, and then geomechanical parameters were extracted. In the second step, scatter plots were used to distinguish between different intervals based on the high hydrocarbon potential zones identified in the first step. The procedure proved to be useful and accurate in locating reservoirs with high hydrocarbon potential.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Energy & Fuels
Junlong Liu, Zhongqun Liu, Zhenfeng Liu, Yali Liu, Baojian Shen, Kaihua Xiao, Youyi Bi, Xiaowen Wang, Ai Wang, Lingxiao Fan, Jitong Li
Summary: This study examines the gas reservoir in the Xinchang area of the western Sichuan Basin, focusing on the Upper Triassic Xujiahe Formation. It proposes the concept of fault-fold-fracture body (FFFB) and identifies its types. The study identifies the main factors controlling fracture development and establishes geological models of FFFB. The findings provide a reference for the exploration and development of deep tight sandstone oil and gas reservoirs in China.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2023)
Article
Geosciences, Multidisciplinary
Shuizhen Liu, Jianwei Feng, Josephine Anima Osafo, Guisheng Li, Gang Li
Summary: In this research, a novel geomechanical model was established to predict fractures in ultra-deep reservoirs. By combining the minimum energy dissipation principle, the generalized Hooke's law, and the three-shear energy yield criterion, a constitutive model and failure criterion for rocks were derived. The stress-energy coupling characterization model of fracture density parameter was obtained based on the law of conservation of energy. The model was validated by simulating the distributions of tectonic stress field and fractures in the Keshen anticline.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Optics
Sanshan Gao, Chi Fai Cheung, Da Li
Summary: Autostereoscopy technology offers a rapid and accurate 3D measurement solution for micro-structured surfaces. The proposed angular super-resolution algorithm improves measurement results by enhancing the resolution and accuracy of the data.
Article
Geosciences, Multidisciplinary
Qing Guo, Xuanyi Wang, Shuai Yin, Zhonghu Wu
Summary: This study used the LX area in the Ordos Basin as an example to restore the tectonic evolution and palaeostructure of the Upper Palaeozoic. The results showed that the strong buckling tectonic activities of the Zijinshan Pluton played a main driving force for the deformation of the Upper Palaeozoic rock mass. The coupling relationship between the ancient and current structural patterns of the target layer and the distribution of commercial gas wells were compared, showing that high parts of the palaeo-tectonic structures are favourable places for the large-scale accumulation of tight sandstone gas.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Ju Wei, Shen Jian, Qin Yong, Wang Geoff, Xu Ke, Li Guozhang, Li Chao
Summary: The Upper Shihezi sedimentary rocks in the Linxing region contain a significant volume of tight sandstone gas. The study indicates a strike-slip stress regime in the Upper Shihezi Formation, with relatively low stresses and potential for complex hydraulic fracture networks. Natural fractures contribute little to gas production, and the minimum principal stress gradient increases with rock stiffness.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2021)
Article
Geosciences, Multidisciplinary
Hui Zhang, Wei Ju, Guoqing Yin, Xinyu Liu, Zhimin Wang, Sijia Liu, Ke Wang, Hui Yang, Ke Xu, Wenbo Luan
Summary: This study predicts the development and distribution of natural fractures in ultra-deep tight sandstone gas reservoirs using conventional logs and the R/S analysis method. The calculated fracture development coefficient Q shows a positive correlation with fracture density, with higher Q values indicating larger fracture density. Various factors such as fracture dip angle, filling condition, and interpretation differences may cause mismatches between calculated parameter Q and fracture density. The results are expected to provide valuable geological references for the exploration and development of ultra-deep tight gas in the Keshen 2 Block of Kuqa Depression.
GEOSCIENCES JOURNAL
(2021)
Article
Energy & Fuels
Qiqiang Ren, Jianwei Feng, Stephen Johnston, Libin Zhao
Summary: This study investigates the influences of argillaceous content on the mechanical parameters of carbonate rocks in the Hetianhe gas field. The research found that increasing argillaceous content led to a decrease in Young's modulus and an increase in Poisson's ratio, while the limestone tenacity increased. The study also identified different fracture characteristics in limestone with different argillaceous content levels.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Jianwei Feng, Jihang Qu, Huiqing Wan, Qiqiang Ren
Summary: In the Futai carbonate oilfield, the study investigated the characteristics of fracture development through core observation and mechanical simulation methods, showing that tectonic and stress fields play a significant role in fracture formation, providing a theoretical basis for predicting the distribution and development of fractures.
JOURNAL OF STRUCTURAL GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Qiqiang Ren, Jianwei Feng, Ji Ma, He Du
Summary: This study utilized various analytical methods to investigate the formation environment of fracture cavities in the Aksu area, Tarim Basin. Through mineralogy, geochemical characteristics, and isotopic determinations, the study identified the textural and compositional types of fractures and cavities, as well as the formation environments, and characterized the different filling stages.
Article
Geosciences, Multidisciplinary
Jingshou Liu, Haimeng Yang, Ke Xu, Zhimin Wang, Xinyu Liu, Lijie Cui, Guanjie Zhang, Yang Liu
Summary: This paper presents a numerical simulation method for the genesis and development of transfer zones in rift basins. Based on geomechanical modeling and three-dimensional seismic interpretation, the structural characteristics and genetic mechanism of a convergent fault were studied. The findings provide important insights into the evolution of transfer zones in rift basins.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Zhimin Wang, Ke Xu, Hui Zhang, Haiying Wang, Guoqing Yin, Zhaohui Wang, Wei Zhao
Summary: Fracture effectiveness evaluation is crucial for the efficient exploration and development of ultra-deep fractured reservoirs. The study highlights that static characteristics are only partial factors in determining the effectiveness of fractures, while dynamic parameters play a key role. The research results provide a scientific basis for optimizing development schemes.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Ke Xu, Hui Zhang, Haiying Wang, Zhimin Wang, Guoqing Yin, Xiaoxue Wang, Tingting Kang, Li Huang, Zhaohui Wang, Wei Zhao
Summary: The study reveals that the Cretaceous reservoirs in the Bozi gas field in the Kuqa Depression generally contain high-angle shear fractures, with fracture development controlled by local structures such as folds and faults, and fracture activity showing significant regional differences with changes in geological structure.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Jingshou Liu, Lianfu Mei, Wenlong Ding, Ke Xu, Haimeng Yang, Yang Liu
Summary: This study accurately predicts the stress field distribution and 3-D morphology of hydraulic fracture networks in the heterogeneous continental reservoir of the Ordos Basin in China through numerical simulation and microseismic monitoring methods. The asymmetric propagation mechanism of hydraulic fractures is investigated. The research results are of great significance for modeling, exploration, and development of continental reservoirs.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Energy & Fuels
Ke Xu, Haijun Yang, Hui Zhang, Wei Ju, Chao Li, Lu Fang, Zhimin Wang, Haiying Wang, Fang Yuan, Bin Zhao, Wei Zhang, Jingrui Liang
Summary: Onshore ultra-deep oil and gas resources are abundant and the effectiveness of fractures is crucial for the development of these reservoirs. This study focuses on the DB-4 ultra-deep gas reservoir in the Kuqa Depression and analyzes the fracture characteristics and effectiveness using geomechanical methods. The relationship between fracture effectiveness and oil and gas production capacity is established through simulated fracture opening. The findings provide geological reference for the efficient development of ultra-deep oil and gas resources in the Kuqa Depression and similar fractured reservoirs around the world.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Ke Xu, Hui Zhang, Ruixia Dong, Wei Ju, Yani Xie, Deyu Cui, Lu Fang, Fang Yuan, Shujun Lai, Jingrui Liang, Wei Zhang, Bin Zhao
Summary: This study establishes 1D MEM and 3D HGM models to clarify the in situ stress distribution and influencing factors in the Kuqa Depression's Bozi gas field. The results indicate that the gas field is under extremely strong in situ stress conditions, with vertical stratification and significant influence from faulted anticline types and overthrusts. The use of highly deviated wells is more beneficial for hydrocarbon exploitation in the Bozi gas field.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Jingshou Liu, Peng Chen, Ke Xu, Haimeng Yang, Hejuan Liu, Yang Liu
Summary: This study investigates the fracture stratigraphy and mechanical stratigraphy of the Triassic Yanchang Formation sandstone reservoirs in the Huaqing area of the Ordos Basin. By analyzing natural fractures and rock mechanical properties, it reveals the relationship between dynamic Young's modulus and fracture density, as well as the correlation between dynamic Poisson's ratio and fracture density.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Hui Zhang, Ke Xu, Binxin Zhang, Guoqing Yin, Haiying Wang, Zhimin Wang, Chao Li, Shujun Lai, Ziwei Qian
Summary: Rock mechanics parameters control the distribution of in situ stress and natural fractures, which is crucial for sweet spot evaluation in reservoir engineering. Experimental results show that rock sonic velocity is highly sensitive to water saturation, and different minerals have varied effects on the rock P-S wave velocity ratio, with quartz content playing a dominant role.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Ke Xu, Haijun Yang, Hui Zhang, Zhimin Wang, Lu Fang, Guoqing Yin, Haiying Wang
Summary: This study examines the geomechanical characteristics of the Dibei gas reservoir in the Tarim Basin, revealing the rock mechanical properties, in situ stress, and fracture characteristics of the tight reservoir. The results show that in situ stress and fracture mechanics significantly impact the production capacity of the gas reservoir. Optimal wellbore trajectory and fracturing strategies can be quantitatively optimized based on geomechanical understanding, leading to more efficient hydraulic fracturing and stimulation of the reservoir. Geomechanics research plays a crucial role in increasing gas production by bridging geology and engineering.
Article
Energy & Fuels
Ke Xu, Hui Zhang, Zhizhen Zhang, Guoqing Yin, Xiaoji Shang, Zhimin Wang, Haiying Wang, Fang Yuan, Ziwei Qian, Shujun Lai
Summary: This paper investigates the coupling effect of in situ stress and fluid pore pressure during hydraulic fracturing and gas fracturing in heterogeneous fractured reservoirs. A coupled fluid-solid-damage mathematical model is established and numerical simulations are conducted. The results show that continuous injection of nitrogen or water increases pore pressure and leads to rock damage and increased porosity. The damage area and length for nitrogen fracturing are larger than hydraulic fracturing, and the changes in pore pressure, permeability, and porosity are consistent with the damage area. The damage evolution during nitrogen fracturing is less affected by in situ stress and matrix permeability compared to hydraulic fracturing.
ENERGY SCIENCE & ENGINEERING
(2023)