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Investigation on the Shear Behavior and Mechanism of MICP-Treated Loess Soil Geofluids (IF 1.7) Pub Date : 2024-3-15 Yang Chen, Li Zhao, Jiaojiao Zi, Jianyong Han, Chaozhe Zhang
Microbially induced carbonate precipitation (MICP) has been utilized as a new method to improve loess soil strength. In this study, we investigated the influence of the main parameters on the shear strength of MICP-treated loess specimens. Initially, culture media with different formulas and pH values were examined to identify the most efficient medium for loess soil. To explore the shear behavior
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The Stability Analyses of Tunnel Faces in Saturated Soils with Soil Arching Effect Geofluids (IF 1.7) Pub Date : 2024-3-14 Liu An, Xi Mingxing, Liu Jun
The undesirable effect on the stability for cross-river tunnel faces considering pore water pressure was observed with the consideration of the soil arch effect by using the discrete technology for the first time. In light of the upper bound of plastic theory, an improved failure mechanism of the deep-buried tunnel face was established. A new discrete technology approach taking account into the soil
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Effect of Temperature Gradient on Compressive Strength and Strain Characteristics of Coarse-Grained Frozen Soil Geofluids (IF 1.7) Pub Date : 2024-3-13 Jiajun Luo, Changtao Hu, Zhilong Zhang, Bingbing Lei, Jing Luo, Ao Zhang, Ge Hao
The temperature field beneath a roadbed is asymmetrically distributed, which causes uneven settlement, longitudinal cracking, and even sliding and collapse, as well as other diseases of frozen soil roadbeds. Most roads in alpine mountain regions are half-filled and half-excavated. The degree and direction of the temperature gradient are utilized as variables in a numerical simulation to examine the
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Reservoir Quality, Lithotype Assessment, and Geochemical Source Rock Analysis: Insights from Well Logs and Pyrolysis Data, Karama Field, North-Western Desert, Egypt Geofluids (IF 1.7) Pub Date : 2024-3-6 Mahmoud Mamdouh, Mohamed Reda, Abdelmoneam Raef, M. Y. Zein El Din, Tharwat H. Abdelhafeez, Mansour H. Al-Hashim
Reservoir characteristics and source rock geochemistry are essential for petroleum system investigation as they reveal reservoir quality and hydrocarbon generation capability, respectively. The primary Karama oil field reservoir of Abu El Gharadig Basin is the limestone-sand-shale Abu Roash G (AR/G) Member. This study examines AR/G, analyzes source rocks for maturity and organic elements, and defines
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Logging Response Mechanism and Content Evaluation of Laumontite-Bearing Glutenite Reservoir: A Case Study of Lower Urho Formation of Permian of the Junggar Basin Geofluids (IF 1.7) Pub Date : 2024-3-6 Jia Jun, Xue Kunlin, Ni Liping, Luo Yang, Liu Yuchao
The Urho Formation in the Lower Permian System at the Junggar Basin in China commonly develops zeolite cements. The presence of zeolite minerals in various states of occurrence and uneven distribution in glutenite reservoirs makes it indeterminate to interpret the well logging response characteristics such as acoustic, resistivity, radioactivity, and nuclear magnetic resonance (NMR). This poses significant
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Ab Initio Molecular Dynamics Simulations and Vibrational Frequency Calculations of Species in Liquid-Liquid Phase Separated MgSO4 Solution at 543 K Geofluids (IF 1.7) Pub Date : 2024-2-21 Mengzi Zhou, Xiancai Lu, Xiandong Liu, Yingchun Zhang, Xiaoyu Zhang, Kai Wang
The transport of sulfate-bearing brines is closely relevant to mineralization of sulfide deposits as metal-sulfate complexes exist in hydrothermal fluids. Liquid-liquid phase separation evidently occurs in various metal-sulfate systems with transport and precipitating different from homogeneous fluids. Previous studies have revealed a new species with a Raman peak at ~1020 cm-1 in rich concentration
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A Two-Dimensional Planar Fracture Network Model for Broken Rock Mass Based on Packer Test and Fractal Dimension Geofluids (IF 1.7) Pub Date : 2024-2-19 Lei Wen, Ping Guo, Xin Zhang, Wen-qiang Lu, Zhong Fang Liu
Broken rock masses with the complexity and concealment widely exist in nature such as underground mine, collapse column, and zone. It is extremely difficult to model fracture networks and to simulate water diffusion for broken rock masses. To explore a reasonable fracture network model for broken rock masses, a new method for modeling a two-dimensional planar fracture network model is proposed in this
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Genesis of the Early Indosinian Darongshan Granitoid in South China: Response to the Subduction of the Eastern Paleo-Tethys Ocean Geofluids (IF 1.7) Pub Date : 2024-1-25 Meng-Yu Tian, Yong-Jun Di, Chun-Yu Zhang, Shu-Guang Deng
The Bangxi–Chenxing suture zone is an essential area from which information about the closure history of the eastern Paleo-Tethys Ocean can be obtained. The Darongshan granitoid, which is adjacent to this suture, lies among the widely distributed granitic rocks and few basic rocks in the southern Guangxi Province. Herein, we report the petrogeochemistry, zircon U–Pb ages, and zircon Hf isotopic data
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A Numerical Simulation Approach for Superheated Steam Flow during Multipoint Steam Injection in Horizontal Well Geofluids (IF 1.7) Pub Date : 2024-1-19 Qiuying Du, Mingzhong Li, Chenwei Liu, Zhifeng Bai, Chenru Zhou, Xiangyu Wang
Superheated steam flow during multipoint steam injection technology has a good effect on improving the steam absorption profile of heavy oil thermal recovery wells, enhancing the production degree of horizontal section of thermal recovery wells, and enhancing oil recovery. Based on the structure of multipoint steam injection horizontal string, considering the characteristics of variable mass flow,
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Experimental and Numerical Simulation Study of Water Infiltration Impact on Soil-Pile Interaction in Expansive Soil Geofluids (IF 1.7) Pub Date : 2024-1-17 Waleed Awadalseed, Xingli Zhang, Yunpeng Ji, XiangJin Wang, Yuntian Bai, Honghua Zhao
A laboratory model of a single pile embedded in Nanyang expansive soil and subjected to water infiltration is applied in this study to examine the interaction between the expansive soil and pile foundation upon water infiltration. The soil matric suction decreases as a result of the rising soil-water content. The amount of soil ground heave reaches its peak of 10.7 mm after 200 hours of water infiltration
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Anisotropy and Energy Evolution Characteristics of Shales: A Case Study of the Longmaxi Formation in Southern Sichuan Basin, China Geofluids (IF 1.7) Pub Date : 2024-1-12 Liu Xiangjun, Zhuang Dalin, Xiong Jian, Zhou Yishan, Liu Junjie, Deng Chong, Liang Lixi, Ding Yi, Jian Xuemei
To obtain the influence of anisotropy and energy evolution characteristics on wellbore stability, the acoustic and mechanical anisotropy characteristics of shales are studied through various experiments, including scanning electron microscopy, ultrasonic pulse transmission, and uniaxial compression experiments, with the Longmaxi Formation shale in the southern area of the Sichuan Basin as the research
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Automatic History Matching for Adjusting Permeability Field of Fractured Basement Reservoir Simulation Model Using Seismic, Well Log, and Production Data Geofluids (IF 1.7) Pub Date : 2024-1-11 Le Ngoc Son, Nguyen The Duc, Sumihiko Murata, Phan Ngoc Trung
Developing automatic history matching (AHM) methods to replace the traditional manual history matching (MHM) approach in adjusting the permeability distribution of the reservoir simulation model has been studied by many authors. Because permeability values need to be evaluated at hundreds of thousands of grid cells in a typical reservoir simulation model, it is necessary to apply a reparameterization
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A Case Study on Preservation Conditions and Influencing Factors of Shale Gas in the Lower Paleozoic Niutitang Formation, Western Hubei and Hunan, Middle Yangtze Region, China Geofluids (IF 1.7) Pub Date : 2024-1-8 Shengling Jiang, Qinghua Zhou, Yanju Li, Rili Yang
The Niutitang Formation of the lower Cambrian (Є1n) is a target reservoir of shale gas widely developed in China’s Middle-Upper Yangtze region, with the characteristics of being widely distributed, having a big thickness and highly organic carbon abundance. However, the exploration and research degree are relatively low. Based on extensive core sample, experimental test results, drilling, and field
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Impact of Tool Eccentricity on Acoustic Logging Response in Horizontal Wells: Insights from Physical Simulation Experiments Geofluids (IF 1.7) Pub Date : 2024-1-5 Yuanjun Zhang, Dong Wu, Maojie Liao, Xuewen Shi, Feng Chen, Chengguang Zhang, Ming Cai, Jun Tang
Horizontal wells are extensively utilized in the development of unconventional reservoirs. However, the logging responses and formation evaluation in horizontal wells can be impacted by factors like anisotropy and tool eccentricity. To investigate the influence of tool eccentricity on acoustic logging response, physical simulation experiments of array acoustic logging were conducted in a scaled borehole
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Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling Geofluids (IF 1.7) Pub Date : 2024-1-3 Yuanling Shi, Conghui Li
Reverse circulation impact drilling has the advantages of high drilling efficiency and less dust, which can effectively form holes in hard rock and gravel layer. As integral reverse circulation drill bits used in the conventional down-the-hole (DTH) hammers are only suitable for specific formations, the whole set of DTH hammer needs to be replaced when drilling different formations. In this paper,
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Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment Geofluids (IF 1.7) Pub Date : 2023-12-29 Linchao Wang, Xin Liang, Xuyang Shi, Jianyong Han, Yang Chen, Wan Zhang
In order to promote sustainable energy development and reduce the impact of fossil fuels on the environment, it is crucial to strengthen the development and utilization of clean and renewable geothermal energy. Liquid nitrogen fracturing, as an emerging waterless fracturing technology, has outstanding advantages in rock fracturing effect and thermal exchange ability with hot dry rock and is more environmentally
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The Combined Effect of Nanoclay Powder and Curing Time on the Properties of Class G Cement Geofluids (IF 1.7) Pub Date : 2023-12-21 Abdulmalek Ahmed, Ahmed Abdulhamid Mahmoud, Salaheldin Elkatatny
When the cement paste is subjected to stresses, the cement matrix and its characteristics are dramatically influenced, especially in the early ages of cement hydration when the cement properties have not yet settled. Nanoclay, which is made up of very small particles, was used to improve the properties of cement. In this study, the early-age performance of cement made with nanoclay powder for use in
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An Advanced Early-Stage Production Forecasting Model for Middle-High Rank Coal Development Geofluids (IF 1.7) Pub Date : 2023-12-20 Zhiwang Yuan, Yancheng Liu, Hao Wu, Yifan Zhang, Yufei Gao, Xu Zhang
Reasonable production prediction of coalbed methane (CBM) is of great significance for improving the economic benefit of CBM reservoirs. Current prediction methods for CBM production focus on the later stages of development, with few studies on early production forecasting. The objective of this work is to provide a reliable new idea for the early production prediction of CBM through various analyses
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Temperature Field Study of Offshore Heavy Oil Wellbore with Coiled Tubing Gas Lift-Assisted Lifting Geofluids (IF 1.7) Pub Date : 2023-12-18 Kechao Gao, Qibin Zhao, Xinghua Zhang, Suogui Shang, Lijun Guan, Jizhi Li, Na Xu, Dagui Cao, Liang Tao, Hongxing Yuan, Yonghai Gao
Offshore heavy oil resources are abundant, but they have greater difficulty and higher costs compared to onshore extraction. When crude oil flows through the seawater section, the temperature of the crude oil decreases faster, making it susceptible to solidification in the wellbore and resulting in lower well production. The cooling of crude oil becomes more pronounced in deep-water wellbore. However
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The Effect of Slickwater on Shale Properties and Main Influencing Factors in Hydraulic Fracturing Geofluids (IF 1.7) Pub Date : 2023-12-18 Jiawei Liu, Xuefeng Yang, Shengxian Zhao, Yue Yang, Shan Huang, Lieyan Cao, Jiajun Li, Jian Zhang
As shale gas reservoirs have low porosity and low permeability, hydraulic fracturing is a necessary means for industrial exploitation of shale gas. In this study, aiming at the problem of reservoir damage in the process of hydraulic fracturing of shale gas reservoir, a physical simulation method of slickwater fracturing fluid flow in shale core has been established. The change laws of physical parameters
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The Time-Varying Variation Characteristics of Methane during Nitrogen Injection Process: An Experimental Study on Bituminous Coals Geofluids (IF 1.7) Pub Date : 2023-12-11 Aoxiang Zhang, Longyong Shu, Zhonggang Huo, Xin Song
The existing research on CH4 displacement by N2 mainly focuses on the gas injection displacement mechanism and the factors affecting displacement efficiency. And most of them are theoretical analyses at the model level or multifactor analyses at the simulation test level, while there are few targeted physical simulation tests and quantitative analyses. Given the above problems, the experiment system
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Influence of the Three Gorges Reservoir Impoundment on Xiannvshan Fault Activity Geofluids (IF 1.7) Pub Date : 2023-12-6 Zhang Jiayu, Zhang Lili, Zhang Yaowen, Yao Yunsheng, Li Haoran, Dai Yiming, Wang Renlong, Hu Caixiong
Since the initial impoundment and commissioning of the Three Gorges Reservoir in June 2003, seismic activity surrounding the reservoir region has undergone substantial changes. Leveraging geological and hydrogeological data from the Three Gorges Reservoir area, this study statistically analyzes the historical water level and earthquake catalog within the reservoir. By examining the correlation between
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Feasibility of Tunnel TEM Advanced Prediction: A 3D Forward Modeling Study Geofluids (IF 1.7) Pub Date : 2023-11-28 Jiannan Fu, Xiaodong Yang, Guanqun Zhou, Xueliang Jin, Fuqin Zhai, Fanbin Meng, Yafei Wang
The transient electromagnetic (TEM) method has long been applied in tunnel advanced prediction. However, it remains questionable to what extent a geologic anomaly body will influence the induced electromagnetic response in front of the heading face. The dilemma is partly because observed TEM data are frequently interpreted by empirical formulas or proportional relationships, and a quantitative measurement
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Fine Detection and Analysis of Hidden Karst in Wellsite with Quasi-Three-Dimensional TDEM Based on Lateral Constraint Geofluids (IF 1.7) Pub Date : 2023-11-22 Bin Wu, Yunping Liao, Hongkai Chen, Lichuan Chen, Shicong Ren, Shihong Xiao, Yunjian Yang, Yong Yang, Haiyou Peng
Considering that karst caves, underground rivers, and dissolution fractures in shallow carbonate formation in the Sichuan Basin are extremely developed, leakage, failure and plugging difficulties are easy to occur in the drilling process. The TDEM was used to carry out the exploration of hidden karst geological bodies in well QM2, and the quasi-three-dimensional inversion based on lateral constrain
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Fracture Initiation and Propagation in the Hot Dry Rock Subject to the Cyclic Injection Hydraulic Fracturing Treatment Geofluids (IF 1.7) Pub Date : 2023-11-16 Yilong Yuan, Wei Wang, Jiawei Tang, Qiang Guo, Yulong Liu
Cyclic injection hydraulic fracturing is a promising way for the geothermal energy exploitation by reactivating the fractures in geothermal reservoir. However, fracture initiation and growth induced by cyclic injection schemes have been inadequately studied for hot dry rock (HDR), and the cyclic injection fracturing optimized often by experience. For this reason, the initiation and propagation of hydraulic
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Heat Transfer Analysis of Enhanced Geothermal System Based on Heat-Fluid-Structure Coupling Model Geofluids (IF 1.7) Pub Date : 2023-11-16 Linchao Wang, Xin Liang, Xuyang Shi, Jianyong Han, Yang Chen, Wan Zhang
Dry hot rock geothermal resources by virtue of its wide distribution, large reserves, clean and low-carbon, stable, high utilization rate, and other characteristics have been widely used. The enhanced geothermal system (EGS) is the most efficient approach for harnessing and exploiting geothermal energy from hot, arid rock formations. To investigate the impact of varying parameters on heat recovery
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Well-Testing Model for Dual-Porosity Reservoir considering Stress-Sensitivity and Elastic Outer Boundary Condition Geofluids (IF 1.7) Pub Date : 2023-11-16 Song Chol Kim, Song Guk Han, Yong Il Song, Jin Sim Kim, Myong Gun Hong
Stress sensitivity and the elastic outer boundary (EOB) condition have a great effect on the analysis of the characteristics of the fluid flow in a reservoir. When researchers analyzed the characteristics of the fluid flow, they have considered the stress sensitivity and the EOB condition separately but have not considered them simultaneously. Therefore, errors are inevitable during the analysis of
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The Impact of Microscopic Pore Network Characteristics on Movable Fluid Properties in Tight Oil Reservoir Geofluids (IF 1.7) Pub Date : 2023-11-14 Jie Gao, Hu Wang, Xiaojun Ding, Qingxiao Yuchi, Qiang Ren, Bo Ning, Junxiang Nan
The fluid flow behavior, generally referred to as seepage, could determine the hydrocarbon and brine movement behavior. Movable fluid property, as one of the vital parameters for seepage characteristic evaluation, was generally used for tight oil reservoirs’ fluid flow ability assessment. The nuclear magnetic resonance technique was used to experiment with movable fluid percentage and movable fluid
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Influence of Water Saturation on Adsorption Behavior at Liquid-Liquid Interfaces in Unsaturated Porous Media Geofluids (IF 1.7) Pub Date : 2023-11-9 Yan Zhu, Ziteng Cui, Kun Li, Chaoqi Wang, Zhao Li, Xueyi Zhang, Zhi Dou
Adsorption reaction in unsaturated porous media is of great importance for soil and groundwater remediation. In this study, the influence of the Peclet number (Pe) and water saturation on adsorption behavior at liquid-liquid interfaces was quantitatively investigated. The pore-scale reactive transport in unsaturated porous media was directly simulated. The Navier-Stokes equations, the surface transfer
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Reactive Transport Modelling of Elevated Dissolved Sulphide Concentrations in Sedimentary Basin Rocks Geofluids (IF 1.7) Pub Date : 2023-10-25 Mingliang Xie, Danyang Su, Kerry T. B. MacQuarrie, K. Ulrich Mayer
Groundwater with total dissolved sulphide concentrations in excess of is relatively common at intermediate depths in sedimentary basins. However, the mechanisms responsible for the formation and spatial distribution of these sulphidic waters in sedimentary basins, which have been affected by periods of glaciation and deglaciation, are not fully understood. Sulphate reduction rates depend on many factors
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Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM Geofluids (IF 1.7) Pub Date : 2023-10-25 Chuigang Zeng, Changbin Yan, Gaoliu Li, Xiao Xu, Fengwei Yang, Weilin Su
The rock chip information (shape, size, and particle size distribution) could comprehensively reflect the characteristics of rock mass and rock-breaking efficiency of TBM. This study is aimed at defining a novel index (effective rock-breaking ratio, ) to identify the rock-breaking efficiency of TBM based on the rock chip information. To evaluate this approach, a series of field sieving and measuring
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Investigation of the Impact of Leaching Agent Concentration and pH on the Stability of Agglomeration of Ion-Absorbed Rare Earth Deposits Geofluids (IF 1.7) Pub Date : 2023-10-25 Zhongquan Gao, Yunzhang Rao, Liang Shi, Xiaoming Zhang, Run Xiang
Ion-absorbed rare earth deposits react with the leaching agent during the in situ leaching process through ion exchange and hydration, which change the stability of ore agglomerates and even result in mining slopes or landslides. Indoor simulated column leaching assays were conducted on ion-absorbed rare earth deposit samples by using magnesium sulfate solution as the leaching solution. Surface zeta
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Investigation of Fracture Evolution and Failure Characteristics of Rocks under High-Temperature Liquid Nitrogen Interaction Geofluids (IF 1.7) Pub Date : 2023-10-17 Linchao Wang, Yi Xue, Xuyang Shi, Zhihao Zhang, Xue Li, Lin Zhu, Ruifu Liu, Lin Sun, Caifang Wu, Songbao Feng
The utilization of liquid nitrogen as a sustainable and water-free fracturing medium exhibits immense promise in engineering applications. In this investigation, Brazilian split tests and acoustic emission tests were conducted to explore the impact of liquid nitrogen cooling on the internal structure and mechanical properties of rock specimens. To examine the influence of liquid nitrogen cooling on
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Effect of Water Content on the Impact Propensity of White Sandstone Geofluids (IF 1.7) Pub Date : 2023-10-17 Jiankui Bai, Chuanming Li, Ruimin Feng, Nan Liu, Xiang Gao, Zhengrong Zhang, Bochao Nie
Impact ground pressure is one of the most common dynamic disasters induced by mining activities, and water content is an important factor affecting such dynamic disasters. In this paper, uniaxial compression test, cyclic loading and unloading test, and acoustic emission test were conducted on white sandstone using RMT-150B rock mechanics test system and DS5 acoustic emission test system. The influence
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Controlling Factors of Organic-Rich Lacustrine Shale in the Jurassic Dongyuemiao Member of Sichuan Basin, SW China Geofluids (IF 1.7) Pub Date : 2023-10-11 Yadong Zhou, Chan Jiang, Dongfeng Hu, Zhihong Wei, Xiangfeng Wei, Daojun Wang, Jingyu Hao, Yuqiang Jiang, Yifan Gu
Organic-rich continental shale, widespread in the Sichuan Basin during the deposition of the Jurassic Dongyuemiao Member (J1d), is considered the next shale hydrocarbon exploration target in southern China. To identify a shale gas sweetspot and reduce exploration risk, it is of great significance to determine the organic matter (OM) enrichment mechanism of J1d shale. In this study, based on sedimentological
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Morphology and Depositional Processes of a Carbonate-Filled Canyon in the Carboniferous KT-II Formation of the Eastern Precaspian Basin, Kazakhstan: Insight from 3D Seismic Data Geofluids (IF 1.7) Pub Date : 2023-10-5 Jiapeng Wu, Xiaodong Cheng, Shanbo Sheng, Leyuan Fan, Kai Guo, Xining Li, Wan Diao, Unmei Tai, Shutang Jin, Shengbin Zhang, Xinxin Song
Canyons in carbonate depositional settings, as important elements of the source-to-sink system, remain poorly studied compared to those in siliciclastic depositional environments. The latest high-resolution three-dimensional seismic data, well logs, and core data at the eastern edge of the Precaspian Basin are used to investigate the geomorphology, infillings, and depositional process of a unique carbonate-filled
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Early Mechanical and Microstructure Evolution Characteristics of Concrete in Steam Curing Condition Geofluids (IF 1.7) Pub Date : 2023-10-4 Shengrong Liao, Chunming Xiao, Yuhao Cui, Yan Xue
In order to study the effect of steam curing on early mechanical properties of concrete, the strength, dynamic elastic modulus, and microstructure characteristics of concrete under different curing methods were tested. The results show that the early strength growth rate of steam curing concrete is obviously higher than that of standard curing. The strength development of concrete during steam curing
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Saturation Height Modelling for Tight Sandstone Reservoirs with Gas Diffusion Dynamics Taken into Account Geofluids (IF 1.7) Pub Date : 2023-10-3 Zhou Lyu, Zhilun Yang, Yuhong Hao, Shunzhi Yang, Liqiong Wang, Sen Chang, Xiaomin Xue, Jing Li
Interpreting and predicting the saturation of tight sandstone gas reservoirs are the key task to improve the reservoir development. The role of gas diffusion dynamics is stronger than that of buoyancy during the gas accumulation of tight sandstone reservoirs. In this study, a saturation height model that takes gas diffusion dynamics into account is proposed, which can complement logging saturation
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Fractured Zone Detection Using Petrophysical Logs by Rescaled Windowed R/S Analyses and Discrete Fracture Network (DFN) of Yanchang Formation in Mahuangshan-Hongliugou Area, Ordos Basin, China Geofluids (IF 1.7) Pub Date : 2023-9-28 Jindong Gao, Lirong Li, Gaorun Gao, Shuwei Ma, Meng Li
Structural fractures generally develop in the upper crust strata and are usually distributed in a convergent pattern, forming structural fracture zones with a specific strike. Fracture zones control the reservoir seepage system and seriously affect the migration and accumulation of oil and gas in tight sandstone reservoirs. Therefore, characterizing the characteristics of the fracture zones for tight
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Production Forecasting of Unruly Geoenergy Extraction Wells Using Gaussian Decline Curve Analysis Geofluids (IF 1.7) Pub Date : 2023-9-28 Ruud Weijermars
Fast and rigorous well performance evaluation is made possible by new solutions of the pressure diffusion equation. The derived Gaussian pressure transient (GPT) solutions can be practically formulated as a decline curve analysis (DCA) equation for history matching of historic well rates to then forecast the future well performance and estimate the remaining reserves. Application in rate transient
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Damage Depth Test and Numerical Simulation of Stope Floor in Mining Face Geofluids (IF 1.7) Pub Date : 2023-9-13 Xipeng Cui, Hongqi Shao, Kailei Zhao
The purpose of this study is to explore the development depth of rock layer rupture and analyze the developmental regularity of mining floor in Dongsi mining area of Xinzhi Coal Mine. Two kinds of pressure water testing methods and numerical simulation are used to study the failure characteristics of the bottom plate of the working face in Dongsi mining area of Xinxian Coal Mine. The results show that
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A PSBFEM Approach for Solving Seepage Problems Based on the Pixel Quadtree Mesh Geofluids (IF 1.7) Pub Date : 2023-9-9 Mingjiao Yan, Yang Yang, Zongliang Zhang, Chao Su, Tianfu Luo
This paper presents a PSBFEM approach that integrates the quadtree mesh generation technique based on digital images for solving seepage problems. The quantitative representation of the distribution of geometrical information and material parameters is achieved by utilizing the color intensity of each pixel, which can then be applied to seepage analysis. The presented method addresses the issue of
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Source Rock Evaluation of Hydrocarbons in Deep-Water Offshore Areas Based on a BP Neural Network Geofluids (IF 1.7) Pub Date : 2023-9-9 Jizhong Wu, Ying Shi, Qianqian Yang, Yanan Wang
Due to the lack of drilling data and poor quality of seismic data in deep-water offshore areas, conventional methods cannot effectively predict the total organic carbon (TOC) content. In this paper, the BP neural network method is used to predict the TOC of the strata overlying the target layer, which adds to the TOC information in the study area. Then, the highest TOC value of the strata overlying
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Degradation Characteristics and Mechanism of Black Sandy Dolomite with Fluid Added in a Mechanical Test Geofluids (IF 1.7) Pub Date : 2023-8-30 Xin Liao, Qi Xu, Sixiang Ling, Angran Tian, Qiang Tang
Sandy dolomite, being a soluble rock, is prone to dissolution and erosion caused by groundwater, leading to the formation of underground caves and fractures. This may result in geological disasters such as ground subsidence and collapse. In this paper, the changes and mechanical properties of black sandy dolomite after hydrochemistry are studied. A semi-immersion test with different concentrations
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Current Status, Future Prospects, and the Need for Geothermal Energy Exploration in Cameroon: Comprehensive Review Geofluids (IF 1.7) Pub Date : 2023-8-24 Marcelin Pemi Mouzong, Inoussah Moungnutou Mfetoum, Simon Koumi Ngoh, Prosper Gopdjim Noumo, Jean Gaston Tamba
Cameroon is a country in Central Africa that relies heavily on hydropower, fossil fuels, solar, and biomass for its energy needs. However, the unstable and intermittent nature of these energy sources makes them unreliable, and there is a pressing need for a more secure and sustainable energy supply. Geothermal energy, which is abundant in Cameroon due to its favorable geological characteristics, has
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The Exquisite Comparison of Shale Mineralogical-Geochemical Characteristics between Chang 7 Member and Chang 9 Member in Yanchang Formation, Ordos Basin Geofluids (IF 1.7) Pub Date : 2023-8-16 Wang Zhang, Xinping Liang, Peng Li, Guoheng Liu
Significant amounts of unconventional oil and gas resources have been discovered in the Yanchang Formation of Ordos Basin. Shale layers deposited in Chang 7 member (divided into Chang 7-2 submember (C7-2SM) and Chang 7-3 submember (C7-3SM) and Chang 9 member (C9M)) are the main source rocks. Based on the comparison of mineralogical and geochemical characteristics, it is concluded that (1) in terms
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Layout and Parameter Analysis of the Cooling System with Mine Water as Cold Source in Linglong Gold Mine Geofluids (IF 1.7) Pub Date : 2023-7-29 Chunlong Wang, Hongkai Zhao, Li Cheng, Guilin Li, Yuyun Fan, Mingwei Jiang, Yingjie Hao, Kun Shao
As the heat hazard problem in the deep mine becomes more prominent, it is difficult to alleviate the high-temperature problem by increasing the air supply and adjusting the ventilation mode alone. In order to solve the issue of heat damage in the Linglong Gold Mine, a cooling system based on water source heat pump technology and utilizing the return air system to exhaust heat was constructed, and each
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Enclosed Karst Depression Identification and Analysis for the Pumped Storage Power Station Reservoir Construction Using DEM Geofluids (IF 1.7) Pub Date : 2023-7-22 Yu Bo, Zhang Tao, Zheng Kexun, Zuo Shuangying, Han Xiao, Wang Senlin, Chen Shiwan
An enclosed karst depression, a typical natural negative terrain, has the advantage of less engineering excavation when constructing a reservoir. In this study, the enclosed karst depression and its range identification technique have been developed. What is more, the geometric parameters and spatial distribution of enclosed karst depressions in Anlong County, Guizhou Province of China, have also been
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Ultrasonic P-Wave to Acquire Parameters of Boise Sandstone Geofluids (IF 1.7) Pub Date : 2023-7-20 Guangquan Li, Kui Liu, Xiang Li
Boise sandstone has a variety of grain diameter, and the heterogeneity makes it difficult to characterize. In this paper, a model of viscous squirt is used to simulate velocity and attenuation of ultrasonic P-wave in the sandstone saturated with water. Phase velocity yielding from the model is fitted against the velocity measured at frequency of 500 kHz, which determinates the quality factor due to
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Study on Spontaneous Combustion Law and Prevention Technology of Abandoned Coal in Goaf of Coal Mine Geofluids (IF 1.7) Pub Date : 2023-7-19 Lin Lin, Zongxiang Li, Mingqian Zhang, Chuntong Miao, Nan Jia, Yan Liu
The spontaneous combustion of coal in goaf areas is a significant natural disaster encountered during coal mining operations. To investigate the oxygen consumption characteristics of different coal types, we conducted TG experiments and closed oxygen consumption experiments using seven coal samples exhibiting various degrees of metamorphism. The findings revealed the following key observations: During
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Experimental Study on Permeability and Deformation Characteristics of Bedding Shale under Triaxial Shear-Seepage Coupling Geofluids (IF 1.7) Pub Date : 2023-7-19 Zhinan Lin, Shihong Feng, Jiaquan Wang, Qiang Zhang, Haifeng Long, Guangming Chen
The bedding structure of shale is generated during the deposition and formation, which results in shales with prominent anisotropic characteristics. It depends on stability, control of oil and gas storage, and deep exploitation. In addition, the mechanical and permeability parts of bedding shale are very complex when it is under deep underground space with coupled high stress and high seepage. In this
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Performance of Ecological Pervious Concrete Prepared with Sandstone/Limestone-Mixed Aggregates Geofluids (IF 1.7) Pub Date : 2023-7-7 Lei Wang, Zhikui Liu, Yan Yan, Bingyan Huang, Yongxiong Xie
To understand the performance of ecological pervious concrete prepared with mixed sandstone/limestone aggregates, limestone and sandstone were used as two aggregates. The sandstone-to-limestone volume ratio was calculated in 0 : 1, 0.25 : 0.75, 0.5 : 0.5, 0.75 : 0.25, and 1 : 0 in coarse aggregate to prepare ecological pervious concrete specimens. The compressive test, water permeability test, cooling
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Stability Analysis of Support Anchor Bolt in the Process of Surrounding Rock Fracture Evolution Geofluids (IF 1.7) Pub Date : 2023-7-6 Juncai Cao, Nong Zhang, Liming Pi, Tieliang An, Shuchen Li, Enan CHi
Various diseases and failures inevitably appear on expressway roadways in water-rich strata under the long-term erosion of water. It is very difficult to support the surrounding rock of a water-rich roadway because water will corrode the anchorage bond and weaken the surrounding rock mass. In the process of supporting, damage and fracture of anchor bolt often appear in water-rich roadway. In order
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Petrological Characteristics and Rock Nomenclature of Sedimentary Bauxite Gas Reservoir: A Case Study of Bauxite in Taiyuan Formation of Ordos Basin Geofluids (IF 1.7) Pub Date : 2023-7-5 Na Liu, Junxiang Nan, Xingying Wang, Yanning Yang, Peng Yin, Renyan Zhang
With the great breakthrough in natural gas exploration of Paleozoic Taiyuan formation in Longdong exploratory area in the southwestern part of Ordos Basin, it is urgent to solve the petrological nomenclature of sedimentary bauxite, so as to further study the pore formation mechanism, distribution law, and controlling factors of bauxite reservoirs. In this paper, X-ray diffraction, polarizing microscope
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Productivity Formula of Horizontal Well in Low-Permeability Gas Reservoir considering Multiple Factors Geofluids (IF 1.7) Pub Date : 2023-6-30 Yan Feng, Mingqiu Li, Qingyuan Deng, Peng Yu, Xiuqing Li, Xi Yang
For horizontal well in low-permeability gas reservoir, the effects of threshold pressure gradient, stress sensitivity, and gas slippage have significant impacts on the well productivity. At present, there are few productivity formulas for horizontal gas well considering all these factors. In this paper, based on the flow analysis of horizontal well in low-permeability gas reservoir, the whole flow
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Insights into Enhanced Oil Recovery by Coupling Branched-Preformed Particle Gel and Viscosity Reducer Flooding in Ordinary Heavy Oil Reservoir Geofluids (IF 1.7) Pub Date : 2023-6-30 Zongyang Li
Viscosity reducer flooding has been successfully applied in tertiary oil recovery of ordinary heavy oil reservoirs. However, lowering interfacial tension or reducing oil viscosity, which is more critical for viscosity reducer to improve oil recovery of ordinary heavy oil, has not yet formed a unified understanding, which restricts the further large-scale application of viscosity reducer flooding for
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Reservoir Sensitivity Analysis of Tight Sandstone and Its Controlling Factors: A Case Study from Chang 4+5 to Chang 6 Reservoirs in N 212 Well Block of Nanniwan Oilfield, Ordos Basin Geofluids (IF 1.7) Pub Date : 2023-6-28 Pingtian Fan, Yuetian Liu, Ping Li, Yanqin Guo, Weichu Yu, Baiqiang Li
Reservoir sensitivity can lead to the physical or chemical reactions to block the pore throat. It is helpful for reducing the damage on tight sandstone reservoir to study the reservoir sensitivity and its controlling factors. This paper mainly focuses on the tight sandstone of the Chang 4+5 and Chang 6 reservoirs of the Yanchang Formation in the Nanniwan Oilfield, Ordos Basin. The reservoir sensitivity
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Resolution-Dependent Multifractal Characteristics of Flow in Digital Rock Twin Simulated Using the Lattice Boltzmann Method Geofluids (IF 1.7) Pub Date : 2023-6-24 Han Tang, Yanhui Dong, Xu-Sheng Wang, Li Wan, Xiao-Wei Jiang
Digital rock twins are widely used to obtain hydraulic properties of porous media by simulating pore-scale fluid flow. Multifractal characteristics of pore geometry and flow velocity distribution have been discovered with two-dimensional (2D) images and three-dimensional (3D) models, whereas the dependency of results on the resolution is not well known. We investigated resolution-dependent multifractal
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Influence of Wellbore Dogleg Severity on Drilling Friction in Horizontal Wells Geofluids (IF 1.7) Pub Date : 2023-6-22 Shitang Chen, Gui Hu, Xueqin Huang, Guohui Zhang, Xinyun Liu
In horizontal drilling, high frictional forces adversely influence operation efficiency. The influence of the rate of change in the overall hole trajectory angle (dogleg severity) is often ignored in the prediction of frictional force in drilling program design, and there is a shortage of quantitative analysis. Aiming at this issue, a mathematical model for computing the radial force caused by axial
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Temporal and Spatial Evolution Mechanisms of the Water-Conducting Fractured Zone of Overlying Strata in the Kongzhuang Coal Mine Geofluids (IF 1.7) Pub Date : 2023-6-21 Zhang Pei-ding, Sun Chao-shang, Fan Xuan, Li Song-tao, Wang Long-jing, Cao Zheng-zheng
Kongzhuang coal mine of Shanghai Datun Energy Resources Co., Ltd. is a typical deep coal mine in eastern China. The mining disturbance of working face in deep coal mine leads to the fracture and movement of overlying strata and the damage of the aquifer in overlying strata, thereby causing water inrush disaster and posing a serious threat to the safety production in coal mine. Therefore, the temporal