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A novel feature selection-driven framework for sustainable and efficient rainfall classification using machine learning models 一个新的特征选择驱动框架,用于使用机器学习模型进行可持续和有效的降雨分类
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-11-29 DOI: 10.1016/j.uncres.2025.100286
Mohamed S. Sawah
Accurate rainfall prediction is essential for managing water resources, mitigating disasters, and supporting sustainable agriculture in the face of increasing climate variability. However, the high dimensionality and heterogeneity of meteorological data often hinder the efficiency and interpretability of traditional models. This study introduces a feature selection driven machine learning framework that enhances rainfall classification accuracy and computational sustainability using Australia's comprehensive weather dataset. Three classifiers Logistic Regression, Random Forest, and a Multi-Layer Perceptron (MLP) neural network were evaluated before and after applying the feature selection. The proposed framework demonstrates that dimensionality reduction significantly improves efficiency while preserving or enhancing predictive capability. Experimental results show up to 96 % reduction in training time and a perfect ROC-AUC score (1.00) for both Random Forest and Neural Network models, with false negatives reduced by 30–68 %, leading to more reliable rain-event detection. The study's novelty lies in systematically quantifying the effect of feature selection on model robustness and efficiency for rainfall prediction a topic that has received limited attention in prior research. These findings provide a sustainable and generalizable approach for real-time rainfall forecasting and can be extended to other climate prediction tasks requiring efficient model deployment under computational constraints.
准确的降雨预测对于管理水资源、减轻灾害和支持可持续农业至关重要,以应对日益加剧的气候变化。然而,气象数据的高维性和异质性往往阻碍了传统模式的效率和可解释性。本研究介绍了一个特征选择驱动的机器学习框架,该框架使用澳大利亚综合天气数据集提高了降雨分类精度和计算可持续性。在应用特征选择之前和之后评估了三种分类器逻辑回归,随机森林和多层感知器(MLP)神经网络。该框架表明,降维显著提高了效率,同时保留或增强了预测能力。实验结果表明,随机森林和神经网络模型的训练时间减少了96%,ROC-AUC得分(1.00)完美,假阴性减少了30 - 68%,导致更可靠的降雨事件检测。该研究的新颖之处在于系统地量化了特征选择对模型鲁棒性和降雨预测效率的影响,这一主题在以往的研究中受到有限的关注。这些发现为实时降雨预报提供了一种可持续和可推广的方法,并可扩展到需要在计算约束下高效部署模型的其他气候预测任务。
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引用次数: 0
Reservoir classification and evaluation of tight sandstone formations based on electric imaging image processing and XGBoost algorithm 基于电成像图像处理和XGBoost算法的致密砂岩储层分类与评价
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-11-21 DOI: 10.1016/j.uncres.2025.100284
Tianyu Liu, Peng Zhu, Tong Ma, Jianjun Guo, Jinhao Chen, Qin Xu, Nijia Jisi
Imaging logging serves as a crucial technique for acquiring reservoir information. Extracting characteristic reservoir parameters, such as fractures and porosity, from log images is of significant importance for reservoir classification and evaluation. The tight sandstone reservoirs in the second member of Xujiahe Formation in the Western Sichuan Depression exhibit poor physical properties, low porosity and permeability, and diverse lithological types. Collectively, these factors contribute to complex fracture development patterns and pose challenges for characterizing their heterogeneity. To address these challenges, this study proposes an integrated evaluation method for tight sandstone reservoirs that combines electrical imaging log image processing with machine learning. The proposed approach initially employs the Otsu method combined with the watershed segmentation algorithm to segment electrical imaging log images and extract fracture features. Subsequently, the ensemble tree model eXtreme Gradient Boosting (XGBoost) is utilized to process the feature parameters, leveraging the advantages of machine learning in parameter processing and feature extraction. This ultimately enables reservoir classification and evaluation. Particularly under small-sample conditions, this method effectively enhances identification performance and facilitates the selection of high-quality reservoirs, thereby laying the groundwork for improved recovery efficiency. In practical application, this method successfully extracted characteristic parameters from fractures in tight sandstone reservoir samples and achieved reservoir classification and preferential selection. Validation against production data confirmed a classification accuracy of 88 % (95 % CI: 84 %–96 %), effectively ensuring identification precision. This study provides more accurate geological interpretation and technical support for the drilling and development of tight sandstone reservoirs in the second member of the Xujiahe Formation in the Western Sichuan Depression.
成像测井是获取储层信息的关键技术。从测井图像中提取裂缝、孔隙度等储层特征参数对储层分类和评价具有重要意义。川西坳陷须二段致密砂岩储层物性差,孔隙度和渗透率低,岩性类型多样。总的来说,这些因素导致了复杂的裂缝发育模式,并为表征裂缝的非均质性带来了挑战。为了解决这些挑战,本研究提出了一种将电成像测井图像处理与机器学习相结合的致密砂岩储层综合评价方法。该方法首先采用Otsu方法结合分水岭分割算法对电成像测井图像进行分割,提取裂缝特征。随后,利用集成树模型eXtreme Gradient Boosting (XGBoost)对特征参数进行处理,充分利用机器学习在参数处理和特征提取方面的优势。最终实现储层分类和评价。特别是在小样本条件下,该方法有效提高了识别性能,有利于优质储层的选择,为提高采收率奠定了基础。在实际应用中,该方法成功提取了致密砂岩储层样品裂缝特征参数,实现了储层分类和优选。对生产数据的验证证实了分类准确率为88% (95% CI: 84% - 96%),有效地确保了识别精度。该研究为川西坳陷须二段致密砂岩储层的钻探开发提供了更为准确的地质解释和技术支持。
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引用次数: 0
Investigation of the macro-micro mechanical properties of soft–hard interbedded rock-like materials considering varied interface roughness and layer thickness proportions 考虑不同界面粗糙度和层厚比例的软硬互层类岩石材料宏观微观力学特性研究
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-11-19 DOI: 10.1016/j.uncres.2025.100282
Jiale Li, Xiao Shi, Chuanqi Su
Soft-hard interbedded rock masses are frequently encountered in tunnel excavation, slope stabilization, and mining engineering, where their intricate mechanical behavior and failure mechanisms significantly impact overall stability. This study involved the creation of mudstone-sandstone interbedded rock specimens to conduct uniaxial compression tests alongside discrete element simulations, with the objective of clarifying the influence of layer thickness ratios and interface roughness on the mechanical behavior, failure characteristics, and energy evolution of these materials. The findings indicate that the layer thickness ratio is the primary determinant of macro-mechanical behavior; increasing the proportion of hard rock significantly improves the composite's overall strength and stiffness. Interface roughness significantly affects both strength and failure mode, with increased roughness resulting in elevated peak and residual strengths. When the layer thickness ratio is 1:1 and the interface roughness is moderate to high, the interbedded rock demonstrates excellent synergistic load-bearing performance. The computational results closely align with the experimental observations, validating the dependability of the chosen mesoscopic parameters. Energy analysis further illustrates that both total and dissipated energies increase nonlinearly, while the progression of elastic energy roughly aligns with the stress response. As interface roughness escalates, the rate of energy dissipation diminishes, leading to a predominance of elastic energy storage, which signifies increased energy buildup and postponed energy release. An instability criterion defined by the ratio of elastic to dissipated energy is proposed, along with an energy-based damage constitutive model, according to energy theory. These findings offer significant experimental evidence and theoretical insights for forecasting collapse and maintaining stability in soft-hard interbedded rock masses.
软-硬互层岩体在隧道开挖、边坡稳定和矿山工程中经常遇到,其复杂的力学行为和破坏机制对整体稳定性有重要影响。本研究通过制作泥岩-砂岩互层岩石试样进行单轴压缩试验,并进行离散单元模拟,目的是阐明层厚比和界面粗糙度对这些材料的力学行为、破坏特征和能量演化的影响。结果表明:层厚比是宏观力学行为的主要决定因素;增加硬岩掺量可显著提高复合材料的整体强度和刚度。界面粗糙度显著影响强度和破坏模式,粗糙度增加导致峰值强度和残余强度升高。当层厚比为1:1,界面粗糙度中高时,互层岩石表现出优异的协同承载性能。计算结果与实验结果吻合较好,验证了所选介观参数的可靠性。能量分析进一步表明,总能量和耗散能量均呈非线性增长,而弹性能量的增长与应力响应大致一致。随着界面粗糙度的增大,能量耗散速率减小,导致弹性能量储存占主导地位,这意味着能量积累增加,能量释放推迟。根据能量理论,提出了由弹性耗散能比定义的失稳判据,并建立了基于能量的损伤本构模型。这些研究结果为软硬互层岩体崩塌预测和稳定性维护提供了重要的实验依据和理论见解。
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引用次数: 0
A review on microgrid control: Conventional, advanced and intelligent control approaches 微电网控制综述:传统、先进和智能控制方法
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-12-24 DOI: 10.1016/j.uncres.2025.100297
Kalpana Bijayeeni Samal, Mitali Mahapatra, Swagat Pati, Manoj Kumar Debnath
A microgrid is an advanced, small-scale power grid comprising conventional and non-conventional generation units, loads, and controllers. One of the reasons behind the growing interest and research in developing the microgrid concept is the seamless integration of renewable energy into the power grid. This concept also helps to ensure a reliable and economical local power supply to remote areas. Furthermore, renewable energy systems supply the network with the necessary power, which may be utilized directly or saved using energy storage devices. This approach to power management requires an effective control system to improve the microgrid's overall performance. Selection and design of an efficient controller for microgrids is a challenging task. There are several challenges to design a stable and effective control structure for a microgrid. This review article provides the details based on 194 published research articles in between 2010 and 2025, covering microgrid architectures, working principles, their harmfulness and control strategies. This review articulates an innovative classification of microgrid control methods, categorizing them as conventional, advanced, and intelligent techniques, along with a comparative evaluation framework based on performance metrics such as robustness, settling time, computational load, and communication requirements. It also identifies existing research gaps as well as their benefits and limitations and suggests a path forward for controller development, aiming to achieve robust and autonomous microgrids. The major findings indicate that hybrid intelligent control systems, which incorporate adaptive, predictive, and AI-based methodologies, excel in complex and dynamic microgrid contexts.
微电网是一种先进的小型电网,由传统和非常规发电机组、负载和控制器组成。开发微电网概念的兴趣和研究日益增长的原因之一是可再生能源与电网的无缝集成。这一概念也有助于确保偏远地区的可靠和经济的本地电力供应。此外,可再生能源系统向网络提供必要的电力,该电力可以直接利用或使用储能设备节省。这种电源管理方法需要一个有效的控制系统来提高微电网的整体性能。选择和设计一种高效的微电网控制器是一项具有挑战性的任务。为微电网设计稳定有效的控制结构面临着诸多挑战。本文基于2010年至2025年间发表的194篇研究论文,详细介绍了微电网的结构、工作原理、危害和控制策略。这篇综述阐述了微电网控制方法的创新分类,将它们分为传统、先进和智能技术,以及基于鲁棒性、稳定时间、计算负荷和通信要求等性能指标的比较评估框架。它还指出了现有的研究差距以及它们的优点和局限性,并为控制器的发展提出了一条前进的道路,旨在实现健壮和自主的微电网。主要研究结果表明,混合智能控制系统结合了自适应、预测和基于人工智能的方法,在复杂和动态的微电网环境中表现出色。
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引用次数: 0
Investigation on the mechanism of multi-physical field cooperative heat extraction based on Field Synergy Principle 基于场协同原理的多物理场协同采热机理研究
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-11-28 DOI: 10.1016/j.uncres.2025.100285
Yuanyuan Ma , Xiaofan Hou , Xiaofei Fu , Xiaodong Li , Shibin Li , Ligang Zhang , Wanchun Zhao , Songze Liu , Xuejia Du
The hot dry rock (HDR) heat extraction process is a typical multi-physical field coupling phenomenon, where efficiency depends not only on the intrinsic properties of individual physical fields but also on their synergistic coordination. To address this, the Field Synergy Principle (FSP) is introduced to analyze the heat extraction process between the HDR reservoir and the working fluid. Based on the coupled temperature-seepage numerical simulation, an evaluation system for heat extraction performance is established, with the Reynolds number, Prandtl number, field synergy number Fc, and field synergy angle as key parameters. The mechanism underlying the differential heat extraction performance of various self-supported fracture types is systematically analyzed, and an optimized fracture configuration scheme for enhanced heat extraction is proposed. The results demonstrate that the field synergy effect is significantly stronger at the fracture entrance and in the central region; however, it deteriorates progressively near the fracture wall, where the angle between the velocity vector and temperature gradient is substantially larger. The field synergy number Fc of the rough fractures is consistently slightly higher than that of the smooth fractures. This study provides theoretical guidance for the optimized design and efficient development of HDR fracturing reservoirs.
干热岩采热过程是一个典型的多物理场耦合现象,其采热效率不仅取决于单个物理场的内在特性,还取决于它们之间的协同配合。为了解决这个问题,引入了现场协同原理(FSP)来分析HDR储层与工作流体之间的热提取过程。基于温度-渗流耦合数值模拟,建立了以雷诺数、普朗特数、场协同数Fc和场协同角为关键参数的抽热性能评价体系。系统分析了不同自支撑型裂缝不同抽热性能的机理,提出了提高抽热性能的优化裂缝构型方案。结果表明:在裂缝入口处和中部区域,现场协同效应显著增强;然而,在裂缝壁附近,速度矢量与温度梯度之间的夹角明显较大,这一特性逐渐恶化。粗糙裂缝的现场协同数Fc始终略高于光滑裂缝。该研究为高阻压裂储层的优化设计和高效开发提供了理论指导。
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引用次数: 0
Robust multi-time-scale scheduling of microgrids with renewable energy interpretation and bidirectionally controlled electric vehicles using adaptive Harris hawks optimization 基于自适应哈里斯鹰优化的可再生能源解释和双向控制电动汽车微电网鲁棒多时间尺度调度
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2026-01-03 DOI: 10.1016/j.uncres.2026.100305
Zhuoting Cheng , Rendong Ji , Hai Tao , Ahmed N. Abdalla , Xiu Tang , Shifeng Li
The increasing penetration of renewable energy sources and bidirectionally controlled electric vehicles into microgrids introduces significant uncertainty in generation output, electricity market prices, and user behavior. These uncertainties pose substantial challenges to achieving reliable, economical, and flexible microgrid scheduling. This paper proposes a robust multi-time-scale scheduling framework that integrates renewable energy interpretation with advanced optimization techniques. A distributionally robust optimization model is developed for day-ahead planning, capturing renewable energy variability and electric vehicle dynamics through an ambiguity set constructed from historical data. The non-convex scheduling problem is solved using an adaptive Harris Hawks Optimization algorithm, which enhances convergence stability and search diversity. During real-time operation, a model predictive control strategy refines dispatch decisions every 15 min based on updated forecasts, ensuring responsiveness to operational fluctuations. The microgrid system under study includes wind turbines, photovoltaic units, microturbines, battery energy storage, and a fleet of bidirectionally controlled electric vehicles. Simulation results demonstrate that the proposed framework significantly reduces operating costs, mitigates power fluctuations, and enhances renewable energy utilization compared to conventional deterministic methods. These findings validate the effectiveness of the proposed strategy in delivering resilient, cost-effective, and renewable-integrated microgrid scheduling under uncertainty.
可再生能源和双向控制的电动汽车越来越多地渗透到微电网中,在发电量、电力市场价格和用户行为方面带来了重大的不确定性。这些不确定性对实现可靠、经济、灵活的微电网调度提出了重大挑战。本文提出了一种鲁棒的多时间尺度调度框架,该框架将可再生能源解释与先进的优化技术相结合。建立了一种分布式鲁棒优化模型,通过历史数据构建的模糊集捕获可再生能源的可变性和电动汽车的动态。采用自适应Harris Hawks优化算法求解非凸调度问题,提高了算法的收敛稳定性和搜索多样性。在实时运行中,模型预测控制策略每15分钟根据更新的预测优化调度决策,确保对运行波动的响应。正在研究的微电网系统包括风力涡轮机、光伏发电装置、微涡轮机、电池储能和一批双向控制的电动汽车。仿真结果表明,与传统的确定性方法相比,该框架显著降低了运行成本,缓解了电力波动,提高了可再生能源的利用率。这些发现验证了所提出的策略在不确定性下提供弹性、成本效益和可再生集成微电网调度的有效性。
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引用次数: 0
Machine learning-based real-time lithology prediction from drilling acoustic signals 基于机器学习的钻井声学信号实时岩性预测
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-12-07 DOI: 10.1016/j.uncres.2025.100291
Eric Mensah Amarfio , Eric Thompson Brantson , Frederick Asamoah , Joel Adu-Awuku , Takyi Botwe , Bright Ntebu Laliri , Eugene Jerry Adjei
Accurate lithology classification is essential for optimizing drilling operations and improving reservoir understanding. Conventional well logging methods often suffer from delays, limiting real-time decision-making. This study introduces drilling acoustic signals as a high-frequency alternative and presents a novel hybrid MLP-XGBoost framework for lithology prediction. Acoustic features, including dominant frequency, amplitude, spectral centroid, spectral bandwidth, and zero-crossing rate, were extracted from drilling sounds recorded at the Johan Sverdrup 16/2 6 well. Three machine learning models were trained: Multi-Layer Perceptron (MLP), XGBoost, and the hybrid MLP-XGBoost model. The hybrid model, unique in its design, leverages the MLP as an adaptive feature engineer to learn complex lithology-specific patterns, while XGBoost performs robust classification, even with noisy data. This two-stage approach achieved the most balanced performance, with 86 % accuracy on the training set and 85 % on the testing set, outperforming the standalone MLP (78 % and 76 %) and XGBoost (98 % and 82 %). Feature importance and SHAP analyses revealed that dominant frequency, amplitude, and spectral centroid were key contributors, demonstrating how the model integrates both dynamic and steady acoustic characteristics to distinguish lithologies. Validation across eight North Sea wells yielded accuracies from 81.8 % to 89.5 %, confirming the model's generalization potential. Overall, this study establishes, for the first time, a robust and scalable machine learning framework for real-time lithology classification using exclusively acoustic signals, offering a practical complement to traditional formation evaluation techniques and opening new opportunities for integration with operational drilling parameters.
准确的岩性分类对于优化钻井作业和提高对储层的认识至关重要。传统的测井方法往往存在延迟,限制了实时决策。该研究引入了钻井声波信号作为高频替代方案,并提出了一种用于岩性预测的新型混合MLP-XGBoost框架。从Johan Sverdrup 16/ 26井记录的钻井声音中提取声学特征,包括主导频率、振幅、频谱质心、频谱带宽和零交叉率。训练了三种机器学习模型:多层感知器(MLP)、XGBoost和混合MLP-XGBoost模型。该混合模型设计独特,利用MLP作为自适应特征工程师来学习复杂的岩性特定模式,而XGBoost即使在有噪声的数据下也能进行稳健的分类。这种两阶段方法实现了最平衡的性能,训练集的准确率为86%,测试集的准确率为85%,优于独立的MLP(78%和76%)和XGBoost(98%和82%)。特征重要性和SHAP分析显示,主导频率、幅度和频谱质心是关键因素,表明该模型如何整合动态和稳定声学特征来区分岩性。在北海的8口井中进行验证,准确率在81.8%到89.5%之间,证实了该模型的推广潜力。总的来说,这项研究首次建立了一个强大的、可扩展的机器学习框架,用于仅使用声学信号进行实时岩性分类,为传统的地层评估技术提供了实用的补充,并为与作业钻井参数的集成提供了新的机会。
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引用次数: 0
Mathematical modeling of reversible and irreversible adsorption dynamics during CO2 storage in coal formation 煤储层中CO2可逆和不可逆吸附动力学的数学建模
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-11-01 DOI: 10.1016/j.uncres.2025.100264
Sheraz Ahmad , Farzain Ud Din Kirmani , Hidayatullah Mahar , Muhammad Shahid , Atif Ismail , Rizwan Younis
Coal is widely recognized as an effective CO2 storage medium due to its high adsorption capacity. Compared to other rock types, coal offers significantly greater CO2 adsorption potential, resulting in a larger storage capacity. However, it is well-known that CO2 adsorption in coal does not occur abruptly or instantaneously but rather as a function of time. Specialized numerical modeling is required for understanding the CO2 storage in coal due to its unconventional formation properties and complex storage mechanisms. Previous mathematical models lack consideration of time and space in CO2 adsorption within coal formations. Additionally, the combined effects of injected CO2 pressure and gas concentration on adsorption potential and storage capacity have not been clearly addressed or incorporated into mathematical models. This study focuses on modeling CO2 adsorption in coal systems using sophisticated computational C# programming. Previously proposed mathematical models each addressing adsorption, pressure, concentration, and gas storage separately have been coupled to provide a comprehensive understanding of CO2 adsorption in coal formations. The coupled model incorporates pore-scale surface heterogeneity and time-dependent adsorption behavior. The core novelty is the integration of multiple, previously isolated mathematical models (for adsorption, pressure, concentration, and gas storage) into a single, comprehensive coupled model. This holistic approach provides a more realistic and complete picture of the system's behavior. It also accurately defines the adsorption mechanism, accounting for both reversible and irreversible adsorption. The computational implementation of this model allows for the examination of CO2 adsorption across time scales, ranging from micro to macro. Adsorption and mechanistic parameters in coal formations vary non-linearly with time.
煤具有较高的吸附能力,被广泛认为是一种有效的CO2储存介质。与其他岩石类型相比,煤具有更大的二氧化碳吸附潜力,从而具有更大的储存能力。然而,众所周知,二氧化碳在煤中的吸附不是突然或瞬间发生的,而是作为时间的函数。由于煤的非常规地层性质和复杂的储存机制,需要专门的数值模拟来了解煤中二氧化碳的储存。以前的数学模型缺乏对煤地层中CO2吸附的时间和空间的考虑。此外,注入CO2压力和气体浓度对吸附势和储存容量的综合影响尚未得到明确解决或纳入数学模型。本研究的重点是使用复杂的计算c#编程来模拟煤系统中的二氧化碳吸附。以前提出的数学模型分别解决了吸附、压力、浓度和气体储存问题,以提供对煤层中二氧化碳吸附的全面理解。耦合模型考虑了孔隙尺度表面非均质性和随时间变化的吸附行为。其核心新颖之处在于将多个先前孤立的数学模型(吸附、压力、浓度和气体储存)集成为一个单一的综合耦合模型。这种整体的方法提供了一个更现实和完整的系统行为图。它还准确地定义了吸附机理,兼顾了可逆吸附和不可逆吸附。该模型的计算实现允许检查CO2吸附跨越时间尺度,从微观到宏观。煤的吸附和力学参数随时间呈非线性变化。
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引用次数: 0
Advancing enhanced geothermal systems: Novel strategies for sustainable energy extraction and risk mitigation 推进增强型地热系统:可持续能源开采和降低风险的新战略
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2025-11-07 DOI: 10.1016/j.uncres.2025.100272
Kelvy P. Dalsania, Anirbid Sircar
Enhanced Geothermal Systems (EGS) represent a pivotal advancement in harnessing geothermal energy as a low-carbon and sustainable power source. However, challenges such as induced seismicity, thermal breakthroughs, and economic viability have hindered their widespread adoption. This study integrates insights from recent advancements in hydraulic stimulation, reservoir optimization, and multi-physics coupling processes to propose innovative strategies for improving EGS efficiency and safety. Novel methods, such as Intermittent Thermal Extraction (ITE) and tunable fracture conductivity, demonstrate significant potential in extending reservoir lifespan, reducing greenhouse gas emissions, and preventing thermal short-circuiting. Mixed CO2-water EGS configurations are highlighted as economically and environmentally advantageous, leveraging carbon sequestration to enhance profitability. Comprehensive evaluations of fracture networks reveal that multi-horizontal well systems and adaptive fracture conductivity designs significantly improve heat exchange efficiency and mitigate thermal losses. Multi-physics coupling models quantify the mechanical, chemical, and coupled effects on reservoir characteristics, offering new insights into optimizing injection strategies. Furthermore, a seismic risk management framework ensures operational safety and public acceptance. This work synthesizes technical and economic perspectives, providing a robust decision-making framework for sustainable EGS development. The findings offer a transformative pathway for achieving cleaner, more efficient geothermal energy systems while addressing critical operational and environmental challenges.
增强型地热系统(EGS)代表了利用地热能作为低碳和可持续能源的关键进步。然而,诸如诱发地震活动、热突破和经济可行性等挑战阻碍了它们的广泛应用。该研究结合了水力增产、油藏优化和多物理场耦合过程的最新进展,提出了提高EGS效率和安全性的创新策略。间歇性热采(ITE)和可调裂缝导流能力等新方法在延长储层寿命、减少温室气体排放和防止热短路方面显示出巨大的潜力。混合二氧化碳-水EGS配置具有经济和环境优势,利用碳固存来提高盈利能力。对裂缝网络的综合评估表明,多水平井系统和自适应裂缝导流设计显著提高了热交换效率,减少了热损失。多物理场耦合模型量化了对储层特征的力学、化学和耦合效应,为优化注入策略提供了新的见解。此外,地震风险管理框架确保了操作安全性和公众接受度。这项工作综合了技术和经济观点,为可持续的EGS发展提供了一个强有力的决策框架。这一发现为实现更清洁、更高效的地热能源系统,同时解决关键的运营和环境挑战提供了一条变革性的途径。
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引用次数: 0
Modeling capillary bound water in limestone reservoirs 石灰岩储层毛细管束缚水模拟
IF 4.6 Pub Date : 2026-01-01 Epub Date: 2026-01-06 DOI: 10.1016/j.uncres.2026.100308
Lulwah M. Alkwai , Kusum Yadav , Shahad Almansour , Debashis Dutta , Hojjat Abbasi
Precise evaluation of capillary bound water is critical for accurate hydrocarbon reserve estimation and reliable forecasting of reservoir behavior. Traditional laboratory techniques and empirical models often struggle with limitations in both accuracy and efficiency. This study introduces a data-driven approach to precisely assess capillary bound water saturation (CABW) in limestone reservoirs, a critical yet challenging aspect of hydrocarbon reserve estimation. This research leverages comprehensive core-analysis data, such as He-porosity, Gas permeability, and Nuclear Magnetic Resonance (NMR) T2lm​ data from diverse limestone core samples to train and validate various machine learning models. We evaluated the performance of several machine learning models. Rigorous data integrity checks were performed using the Leverage technique for outlier detection, while sensitivity analysis quantified the impact of features on CABW​. Model robustness was confirmed through K-fold cross-validation. The CNN model demonstrated superior performance and gas permeability as the strongest interpreter of CABW​, a finding that underscores the physical validity of our model at the core scale. This study highlights the strong capability of soft computing approaches to enhance petrophysical modeling in complex reservoirs, providing a scalable and economical alternative to traditional techniques. By integrating core analysis with computational modeling, the methodology advances reservoir characterization and reserve estimation with greater accuracy and reliability.
准确评价毛细束缚水是准确估计油气储量和可靠预测储层动态的关键。传统的实验室技术和经验模型经常在准确性和效率上受到限制。该研究引入了一种数据驱动的方法来精确评估石灰岩储层的毛细管束缚水饱和度(CABW),这是油气储量估算的一个关键但具有挑战性的方面。本研究利用综合岩心分析数据,如不同石灰岩岩心样品的he孔隙度、气体渗透率和核磁共振(NMR) T2lm数据,来训练和验证各种机器学习模型。我们评估了几个机器学习模型的性能。使用杠杆技术进行了严格的数据完整性检查,用于异常值检测,而敏感性分析量化了特征对CABW的影响。通过K-fold交叉验证证实了模型的稳健性。CNN模型表现出卓越的性能和渗透率,是最强的CABW解释器,这一发现强调了我们的模型在核心尺度上的物理有效性。这项研究强调了软计算方法在复杂储层中增强岩石物理建模的强大能力,为传统技术提供了一种可扩展且经济的替代方案。通过将岩心分析与计算建模相结合,该方法提高了储层表征和储量估计的准确性和可靠性。
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引用次数: 0
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