Brittle Characteristic and Microstructure of Sandstone under Freezing-Thawing Weathering by Songtao Yu, Junren Deng, Hongwei Deng, Feng Gao, Jielin Li

“…Mechanical and Nuclear Magnetic Resonance parameters of sandstone under various Freezing-Thawing (F-T) cycles are also acquired and analyzed. …”
Get full text

Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone by Wenwu Zhong, Xin Zhang, Tao Li, Xin Yang, Wei Deng, Jianchao Shi

“…In this work, CT scanning experiments of intact sandstone specimens and fractured sandstone specimens were performed. …”
Get full text

Research on the Influence of Moisture Condition on the Mechanical Properties and Microstructure of Sandstone by Zuosen. Luo, Zuoxiang. Zhu, Hao Bai, Daxiang Liu, Qiancheng. Sun

“…The sandstone from the dry to saturated state shows obvious deterioration characteristics. …”
Get full text

Experimental Study on the Anisotropic Characteristics and Engineering Application of Tight Sandstone by Yuanlong Wei, Wei Liu, Zhenkun Hou

“…The anisotropy of tight sandstone (a type of unconventional gas reservoirs) is a significant factor influencing the characteristics of cracks network under hydrofracturing; thus, it also has a large influence on the final production capacity of the gas reservoirs. …”
Get full text

Optimal Proportion of Similar Materials and Rockburst Tendency of White Sandstone by Chaoyi Ma, Zhengguo Zhu, Zhichun Fang, Zhaobin Li, Liu Liu

“…To explore the tendency of rockburst, a similar material ratio was optimised based on white sandstone. Quartz sand, iron powder, gypsum, cement, retarder, and a water-reducing agent were used as the main materials. …”
Get full text

A New Method for Predicting the Permeability of Sandstone in Deep Reservoirs by Feisheng Feng, Pan Wang, Zhen Wei, Guanghui Jiang, Dongjing Xu, Jiqiang Zhang, Jing Zhang

“…The results show that the SVR models are applicable in both high and relatively low porosity-permeability sandstone reservoirs; it can provide a higher degree of precision, and it is recognized as a helpful tool aimed at estimating the permeability in sandstone formations, particularly in situations where it is crucial to obtain a precise estimation value.…”
Get full text

Engineering Characteristics and Application Analysis of Red Sandstone in the Lanzhou Metro by Yujie Li, Zhongju Feng, Yanpeng Zhu, Pengyun Wei, Fudeng Zhao

“…The water-rich red sandstone strata at the Lanzhou Metro site area have special engineering properties and vary greatly in their speed of disintegration when exposed to water. …”
Get full text

Impacts of Pore-Throat System on Fractal Characterization of Tight Sandstones by Dengke Liu, Zhaolin Gu, Ruixiang Liang, Junwei Su, Dazhong Ren, Bin Chen, Chuanqing Huang, Chao Yang

“…The pore-throat structures play a dominant role in the evaluation of properties of tight sandstone, but it remains difficult to determine the related parameters and understand their impact on reservoir quality. …”
Get full text

Changing Characteristics of Sandstone Pore Size under Cyclic Loading by Jiaguang Kan, Guichen Li, Nong Zhang, Peng Wang, Changliang Han, Shun Wang

“…These characteristics were studied under different pressures, pore diameters, and pore throat size distribution laws using a UTM5540 electronic universal testing machine, magnetic resonance imaging scanning, and low field nuclear magnetic resonance spectroscopy with cyclic loading on yellow sandstone. We found the following. (1) Under 0–10 MPa load, the peaks of the sandstone T2 spectrum move left as load increases, and the porosity of the sandstone decreases. …”
Get full text

An Experimental Study on Stress Sensitivity of Tight Sandstones with Different Microfractures by Xinli Zhao, Zhengming Yang, Zhiyuan Wang, Wei Lin, Shengchun Xiong, Yutian Luo, Zhongkun Niu, Debin Xia

“…As a result, the tight sandstone pore size is greatly reduced and the permeability is gradually reduced. …”
Get full text

Quantifying Fractal Dimension in Integrated Experimental Data of Tight Sandstones by Dazhong Ren, Rongxi Li, Dengke Liu, Yuhong Li, Na Liu, Fu Yang

“…Determining the microscopic pore structures of tight sandstones is becoming one of the most challenging efforts, and the strong heterogeneity makes the accurate assessment still a problem. …”
Get full text

Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties by Xianshan Liu, Ming Xu, Ke Wang

“…Permeability of sandstones with different properties taken from Chongqing reservoirs has been measured and deeply discussed under increasing deviatoric stress. …”
Get full text

The Damage Constitutive Model of Sandstone under Water-Rock Coupling by J. Jiang, Z. M. Hou, K. P. Hou, Y. F. Lu, H. F. Sun, X. D. Niu

“…The damage mechanism of sandstone under the coupling action of water and force is clarified based on the microscopic test of sandstone under the coupling action of water and rock in this paper. …”
Get full text

A Research on the Effect of Heterogeneities on Sandstone Matrix Acidizing Performance by Jianye Mou, Lei Wang, Shicheng Zhang, Xinfang Ma, Boyang Li

“…Matrix acidizing is one of the common methods to enhance production in sandstone reservoirs. Conventional acidizing designs generally neglected the effect of heterogeneities of mineral and flow field distributions both in areal and vertical directions and assumed that the acid front propagates with a piston-like style. …”
Get full text

Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios by Yang Wang, Manchao He, Dongqiao Liu, Yubing Gao

“…In this study, rockburst in four elliptical holes with different axial ratios in sandstone under biaxial loading is studied as an analogue for underground roadways. …”
Get full text

Trade Sanctions — Effects and Side Effects by Thieß Petersen, Thomas Schwab

“…Abstract Trade sanctions have been repeatedly used as an instrument to force countries to change policies or actions that are considered condemnable. …”
Get full text

The impact of economic sanctions on the country's economy by S. Alikhani, I. P. Khominich

Subjects: “…economic sanctions…”
Get full text

Insight into the Pore Structures and Its Impacts on Movable Fluid in Tight Sandstones by Dazhong Ren, Fu Yang, Rongxi Li, Desheng Zhou, Dengke Liu, Ying Li

“…Both the characteristics of pore structure and movable fluid are significant properties in controlling the flow regularity in pores in tight sandstones. However, the governing factors that affect the fluid flow features will still be a myth. …”
Get full text

On the Imbibition Model for Oil-Water Replacement of Tight Sandstone Oil Reservoirs by Xiong Liu, Desheng Zhou, Le Yan, Shun Liu, Yafei Liu

“…A model suitable for evaluating a tight sandstone reservoir is established. The model includes two oil-water replacement modes: capillary force mode and osmotic pressure mode. …”
Get full text

Experimental Study on the Effects of Stress Variations on the Permeability of Feldspar-Quartz Sandstone by Fugang Wang, Zhaoxu Mi, Zhaojun Sun, Xufeng Li, Tianshan Lan, Yilong Yuan, Tianfu Xu

“…Through laboratory experiments, variations in the permeability of sandstone in the Liujiagou formation of the Ordos CO2 capture and storage (CCS) demonstration project were analyzed using cyclic variations in injection pressure and confining pressure and multistage loading and unloading. …”
Get full text