Geomechanics for Energy and the Environment最新文献_第2页

A data-driven analysis of changes in volumetric and hydraulic properties of rocks under the presence of hydrogen 氢存在下岩石体积和水力特性变化的数据驱动分析

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-02-16 DOI: 10.1016/j.gete.2026.100805

Eftychia Christodoulou , Charalampos Konstantinou , Panos Papanastasiou

Underground hydrogen storage (UHS), considered a viable solution for large-scale storage, raises concerns about the integrity and performance of reservoir and caprock formations under hydrogen exposure. This study investigates the volumetric and hydraulic properties alterations of different type of rocks under the influence of hydrogen, through data-driven analysis by employing the random forest (RF) algorithm, a machine learning (ML) technique. Data have been collected from the existing literature which relate to porosity and permeability changes and calculation of hydrogen diffusion coefficients after the rock formations have been exposed to hydrogen. Variables such as the initial rock properties, type of rocks and environmental conditions are included as features in the ML models. For porosity and permeability, the most influential factors found, are the type of rock and its initial porosity and permeability values, with low-porosity rocks like shales showing higher sensitivity to hydrogen exposure, especially under high pressure (>10 MPa) and high temperature (>100°C). Based on the measurements, a unified Kozeny-Carman type equation across lithologies is derived, which can be used in reservoir mathematical models. In predicting hydrogen diffusion, initial porosity, pressure, and hydrogen concentration were the most important variables, with strong interactions observed between porosity and insitu conditions such as pressure, temperature and hydrogen exposure duration. Based on the feature importance results, the Chapman-Enskog equation was also fitted to the data to predict diffusivity, primarily for sandstone formations, and could also be used for modelling. The findings highlight clear gaps in the existing experimental literature and indicate the need for additional laboratory studies targeting under-represented combinations of operating conditions.

地下储氢（UHS）被认为是一种可行的大规模储氢解决方案，但它引起了人们对储层和盖层地层在氢气暴露下的完整性和性能的担忧。本研究采用随机森林（RF）算法(一种机器学习（ML）技术，通过数据驱动分析，研究了不同类型岩石在氢气影响下的体积和水力特性变化。本文收集了有关岩石暴露于氢气后孔隙度和渗透率变化以及氢扩散系数计算的现有文献数据。初始岩石属性、岩石类型和环境条件等变量都作为ML模型的特征。对于孔隙度和渗透率，影响最大的因素是岩石类型及其初始孔隙度和渗透率值，页岩等低孔隙度岩石对氢气暴露的敏感性更高，特别是在高压（>10 MPa）和高温（>100℃）条件下。在此基础上，推导出了跨岩性的统一Kozeny-Carman型方程，该方程可用于储层数学模型。在预测氢气扩散时，初始孔隙度、压力和氢气浓度是最重要的变量，孔隙度与压力、温度和氢气暴露时间等原位条件之间存在很强的相互作用。基于特征重要性的结果，Chapman-Enskog方程也被拟合到数据中来预测扩散系数，主要用于砂岩地层，也可用于建模。研究结果突出了现有实验文献中的明显差距，并表明需要针对代表性不足的操作条件组合进行额外的实验室研究。

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引用次数: 0

Finite element analysis of shear stress evolution in fault-related folds: implications for subsurface geomechanics and energy applications 断裂相关褶皱剪切应力演化的有限元分析：对地下地质力学和能源应用的启示

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-03-02 DOI: 10.1016/j.gete.2026.100813

Anis Khalifeh-Soltani , Mehdi Ganjiani , Reza Derakhshani

Fault-related folds are critical subsurface structures that strongly influence fluid flow, reservoir integrity, and fault stability in a wide range of energy and environmental applications. Reliable predictions of their mechanical behavior are essential for assessing risks associated with hydrocarbon production, geothermal operations, carbon storage, and induced seismicity. In this study, we employ two-dimensional finite element models to quantify the evolution of shear stress component in three end-member fold types—detachment, fault-propagation, and fault-bend folds. Stress–time histories extracted from representative elements on fold surfaces and fault planes reveal systematic spatiotemporal patterns. The results show that (i) maximum shear stresses localize at fault tips and fold forelimbs, whereas minima occur near detachment terminations and fold crests; (ii) layer buckling enhances shear stress magnitudes and reorients principal stress axes, promoting strain localization; and (iii) shear stresses consistently peak at ∼45° to bedding, independent of fold rotation. These findings provide new quantitative insights into the mechanical evolution of fault-related folds and offer practical guidance for geomechanical modeling strategies in subsurface energy and environmental applications.

断层相关褶皱是重要的地下构造，在广泛的能源和环境应用中强烈影响流体流动、油藏完整性和断层稳定性。对其力学行为的可靠预测对于评估与油气生产、地热作业、碳储存和诱发地震活动相关的风险至关重要。在这项研究中，我们采用二维有限元模型量化了三种末端褶皱类型——剥离褶皱、断层传播褶皱和断层弯曲褶皱中剪应力分量的演化。从褶皱面和断面的代表性元素中提取的应力-时间历史揭示了系统的时空格局。结果表明：(1)最大剪应力出现在断层尖端和褶皱前肢，最小剪应力出现在滑脱末端和褶皱峰附近；（ii）层屈曲增强了剪切应力的大小，改变了主应力轴的方向，促进了应变局部化；（iii）剪切应力始终在与层理的~ 45°处达到峰值，与褶皱旋转无关。这些发现为断层相关褶皱的力学演化提供了新的定量见解，并为地下能量和环境应用的地质力学建模策略提供了实用指导。

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引用次数: 0

Impact of pore-water salinity and sulphate concentration on the breakdown pressure of limestone rocks 孔隙水矿化度和硫酸盐浓度对石灰岩破裂压力的影响

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2025-12-25 DOI: 10.1016/j.gete.2025.100781

Mohammad Rezaee, Mohsen Masihi, Hassan Mahani

Hydraulic fracturing (HF) is widely used to enhance production from subsurface energy systems, with fracturing pressure governed by geochemical and geomechanical factors. While similar rock types and stress conditions may exist across regions, rock-pore water interactions can vary, influencing fracture behavior. A key factor overlooked in current models is sulphate ion variability in pore water, which interacts with carbonate rock and alters its mechanical properties. This study investigates how sulphate concentration in the formation water affects HF in limestone rock, using laboratory-scale experiments and theoretical modeling. A custom-built 2D fracturing apparatus was used to evaluate breakdown pressure (BP) dependency on sulphate concentration and injection rate. Additional insights were obtained through surface complexation modeling, disjoining pressure calculations, microscopic imaging, and elemental analysis. Results indicate that BP increases with injection rate, facilitating smoother, more effective fractures. The primary weakening mechanism arises from alterations in intergranular forces due to brine composition changes, rather than mineral dissolution or precipitation. Salinity affects BP by modifying both rock tensile strength and local stress state. Notably, BP exhibits a non-monotonic trend with sulphate concentration, reaching maximum weakening at 1 M salinity. High salinity results in lower BP, leading to irregular, less conductive fractures, while lower sulphate levels enhance injectivity post-HF, improving reservoir performance. These novel findings provide critical insights for optimizing HF and injection operations, particularly when brine salinity differs from formation water, enabling more effective well stimulation strategies in carbonate reservoirs.

水力压裂（HF）被广泛用于提高地下能源系统的产量，压裂压力受地球化学和地质力学因素的影响。虽然不同地区可能存在相似的岩石类型和应力条件，但岩石-孔隙-水的相互作用可能会有所不同，从而影响裂缝行为。当前模型忽略的一个关键因素是孔隙水中硫酸盐离子的变化，它与碳酸盐岩相互作用并改变其力学性质。本研究利用实验室规模的实验和理论模型研究了地层水中硫酸盐浓度对石灰岩中HF的影响。使用定制的2D压裂仪来评估破裂压力（BP）与硫酸盐浓度和注入速率的关系。通过表面络合模拟、分离压力计算、显微成像和元素分析获得了更多的见解。结果表明，BP随着注入速度的增加而增加，有利于裂缝更平滑、更有效。主要的弱化机制是由于卤水成分变化引起的晶间力的改变，而不是矿物溶解或沉淀。盐度通过改变岩石抗拉强度和局部应力状态来影响BP。值得注意的是，BP随硫酸盐浓度呈非单调趋势，在1 M盐度时减弱最大。高矿化度导致BP降低，导致裂缝不规则、导流性差，而较低的硫酸盐水平提高了hf后的注入能力，改善了储层性能。这些新发现为优化HF和注入作业提供了重要的见解，特别是当盐水盐度与地层水不同时，可以实现更有效的碳酸盐岩储层增产策略。

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引用次数: 0

A multi-method integration approach for determining draw angles in underground metal mining: A case study of the kuogeshaye gold mine 地下金属开采角度确定的多方法集成方法——以郭格沙耶金矿为例

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.gete.2025.100777

Jiahui Tian , Ruiyang Bi , Jian Zhou , Zupu Xuan , Kun Du

Accurate determination of the draw angle is critical for defining surface subsidence boundaries and ensuring the safety of surface infrastructure during mining operations. To overcome the limitations of single-method approaches, this study proposes a multi-method integration framework. Using the Kuogeshaye Gold Mine as a case study, the framework effectively combines theoretical calculation, particle swarm optimization–support vector machine prediction, and numerical simulation. The maximum relative error between the results achieved using the three methods was only 5.1 %. Additionally, an analytic hierarchy process-based weighted fusion strategy was used to integrate the results from the three methods, yielding a more reliable determination. The final draw angles were 73.5° and 74.7° for a hanging wall and footwall, respectively. Engineering applications demonstrated that this method significantly enhanced the accuracy of surface subsidence zone-boundary delineation, offering a transferable methodology for determining the rock draw angle and ensuring safe mining in deep mines.

准确确定地表倾角对于确定地表沉陷边界、保障地表基础设施安全是至关重要的。为了克服单一方法方法的局限性，本研究提出了一个多方法集成框架。以Kuogeshaye金矿为例，该框架有效地将理论计算、粒子群优化-支持向量机预测和数值模拟相结合。三种方法测定结果的最大相对误差仅为5.1% %。此外，采用基于层次分析法的加权融合策略对三种方法的结果进行综合，得到更可靠的结果。上盘和下盘的最终抽采角度分别为73.5°和74.7°。工程应用表明，该方法显著提高了地表沉陷带边界圈定的精度，为确定深部矿山岩层倾角、保障矿山安全开采提供了一种可转移的方法。

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引用次数: 0

A unified thermo–hydro–mechanical load-transfer framework for energy piles: Quantifying interfacial softening 能源桩热-水-机械统一荷载传递框架：界面软化量化

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-02-26 DOI: 10.1016/j.gete.2026.100810

Tuan A. Pham , Sadegh Nadimi , Melis Sutman

Energy piles, which serve concurrently as structural foundations and ground source heat exchangers, exhibit complex, coupled thermo-hydro-mechanical (THM) load-transfer responses that are often poorly predicted by conventional models. Current methodologies predominantly simplify the interaction, focusing primarily on temperature-induced pile expansion while overlooking crucial changes in the surrounding soil properties and interface behaviour. This paper presents a novel, unified load-transfer approach designed to accurately capture the nonlinear, multi-factor performance of energy piles embedded in multi-layered soils. The model's uniqueness lies in the simultaneous incorporation of advanced constitutive relationships that account for the temperature dependence of key geotechnical parameters, including thermal expansion/shrinkage of pile materials, radial thermal stress, total stress, particle contact area ratio, pore-water pressure, internal friction angle, effective cohesion, overconsolidation ratio, and suction stress. This framework explicitly integrates the effects of thermal softening of the soil skeleton and the generation of thermally induced excess pore-water pressure. The complex non-linear equilibrium is solved using an iterative Neutral Plane (NP) procedure to precisely determine the distribution of axial forces and skin friction. The predictive capability of the model is rigorously validated against three distinct full-scale field tests across diverse soil types: sandy silts, granular soils, and high-plasticity clays. Results show that the proposed method achieves high accuracy, with an average relative error ranging from 3% to 8.2% across all validation cases. Crucially, the analysis demonstrates that thermal effects significantly decrease or increase interface resistance depending on site characteristics, an observation that cannot be replicated when only pile expansion is considered. This work provides a robust, physics-based predictive tool essential for mitigating design risks associated with THM coupling, advancing the safe and efficient integration of geothermal energy systems into foundational engineering practice.

能源桩同时作为结构基础和地源热交换器，表现出复杂的，耦合的热-水-机械（THM）负载传递响应，通常是传统模型难以预测的。目前的方法主要简化了相互作用，主要关注温度引起的桩扩展，而忽略了周围土壤性质和界面行为的关键变化。本文提出了一种新的、统一的荷载传递方法，旨在准确地捕捉嵌入多层土壤中的能量桩的非线性、多因素性能。该模型的独特之处在于同时结合了先进的本构关系，考虑了关键岩土参数的温度依赖性，包括桩材料的热膨胀/收缩、径向热应力、总应力、颗粒接触面积比、孔水压力、内摩擦角、有效黏聚力、超固结比和吸力应力。该框架明确整合了土骨架的热软化效应和热诱导的超孔隙水压力的产生。采用迭代中立面法求解复杂的非线性平衡，精确确定轴向力和表面摩擦力的分布。该模型的预测能力通过三种不同的全尺寸现场测试进行了严格验证，这些测试涉及不同的土壤类型：沙质粉砂、颗粒土和高塑性粘土。结果表明，该方法具有较高的准确率，在所有验证案例中，平均相对误差在3% ~ 8.2%之间。至关重要的是，分析表明，热效应会显著降低或增加界面阻力，这取决于场地特征，这一观察结果在仅考虑桩的膨胀时是无法复制的。这项工作提供了一个强大的、基于物理的预测工具，对于降低与THM耦合相关的设计风险至关重要，促进了地热能源系统与基础工程实践的安全高效集成。

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引用次数: 0

Discussion of “Assessment of an amended soil as a climate adaptive barrier: Element testing and physical modelling” “作为气候适应屏障的改良土壤的评估：元素测试和物理模型”的讨论

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2025-12-25 DOI: 10.1016/j.gete.2025.100784

Vishnu Gopakumar, Bharat Venkata Tadikonda

This discussion examines methodological and interpretative aspects of “Assessment of an amended soil as a climate adaptive barrier: element testing and physical modelling” by Rana et al., emphasizing critical insights for enhancing barrier reliability. Key concerns include the potential for measurement errors arising from delayed hydraulic response and equilibration protocols associated with tensiometer and ceramic sensor techniques. These issues cause significant disparities in soil water characteristic curve (SWCC) and hydraulic conductivity results. The discussion highlights that breakthrough mechanisms in fine-textured, water treatment residual (WTR) amended soils are best characterized by suction equilibrium rather than hydraulic conductivity convergence, aligning with recent research on capillary barrier systems. Environmental and long-term durability factors are discussed, including the implications of organic matter degradation, vegetation compatibility, and atmospheric drying cycle effects. The verification of sensor response times and long-term assessment are recommended to improve the robustness and utility of WTR-based climate adaptive barriers.

本讨论探讨了Rana等人的“作为气候适应性屏障的改良土壤评估：元素测试和物理建模”的方法和解释方面，强调了提高屏障可靠性的关键见解。关键问题包括延迟液压响应和与张力计和陶瓷传感器技术相关的平衡协议所引起的测量误差的可能性。这些问题导致土壤水分特征曲线（SWCC）和导水系数结果存在显著差异。讨论强调，细结构水处理残留物（WTR）修正土壤的突破机制最好是通过吸力平衡而不是水力导电性收敛来表征的，这与最近对毛细屏障系统的研究一致。讨论了环境和长期耐久性因素，包括有机质降解、植被兼容性和大气干燥循环效应的影响。建议对传感器响应时间进行验证和长期评估，以提高基于wtr的气候适应屏障的鲁棒性和实用性。

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引用次数: 0

Cracking patterns, self-healing and properties of sand-bentonite liner under environmental stresses: A CT scanning and laboratory testing approach 环境应力下砂-膨润土衬垫的开裂模式、自修复和性能：CT扫描和实验室测试方法

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-01-03 DOI: 10.1016/j.gete.2026.100786

Mina Fattahi, Reza Imam

Compacted Impervious Liners (CILs) play a critical role in landfills by preventing environmental pollution. Where local soils do not meet stringent design criteria, soil amendment with bentonite is widely adopted to enhance properties of CILs. This study focuses on examining the behavior of a typical sand-bentonite mixture used as CIL and investigating the cracking patterns, self-healing properties in terms of hydraulic conductivity and uniaxial strength under wet-dry and freeze-thaw cycles, and effects of bentonite type and percentage on these properties. CT scanning and image processing results showed that in higher plasticity mixtures containing more sodium bentonite, cracks formed during wet-dry cycles tend to be larger and surficial; however, following freeze-thaw cycles, they are thinner, shorter and distributed uniformly over the sample depth. In the lower plasticity calcium bentonite mixtures, the cracking patterns during the two types of environmental stresses are reversed. Moreover, three patterns of changes in hydraulic conductivity and self healing during wet-dry cycles depending on the bentonite type of the mixture are also identified. Possible explanations for the cracking and self-healing observations are also provided. Effects of bentonite type and mixture plasticity on the various mixture properties including strength, stiffness, post-peak softening rate, failure mechanism, hydraulic conductivity, compaction properties, etc. are also examined. It was noticed that for the low PI mixture, wet-dry cycles finally lead to either increase or decrease in hydraulic conductivity depending on the mixture density.

压实防渗衬垫（CILs）在垃圾填埋场中起到了防止环境污染的重要作用。在当地的土壤不符合严格的设计标准，土壤改良剂与膨润土被广泛采用，以提高混凝土的性能。本研究的重点是研究一种典型的砂-膨润土混合物作为CIL的行为，研究其在干湿循环和冻融循环下的开裂模式、水力导电性和单轴强度方面的自愈性能，以及膨润土类型和百分比对这些性能的影响。CT扫描和图像处理结果表明，在含钠型膨润土较多的高塑性混合料中，干湿循环过程中形成的裂纹往往较大且较浅；然而，在冻融循环之后，它们变得更薄、更短，并且在样品深度上分布均匀。在低塑性钙膨润土混合物中，两种环境应力作用下的开裂模式是相反的。此外，根据混合物的膨润土类型，还确定了干湿循环过程中水力导电性和自愈性的三种变化模式。对裂缝和自愈现象的可能解释也提供了。研究了膨润土类型和混合料塑性对混合料强度、刚度、峰后软化率、破坏机制、导电性、压实性等性能的影响。值得注意的是，对于低PI混合物，干湿循环最终会导致导电性的增加或减少，这取决于混合物的密度。

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引用次数: 0

Effects of pore pressure-dependent friction laws on supershear earthquakes 孔隙压力相关摩擦规律对超剪切地震的影响

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI: 10.1016/j.gete.2026.100787

Sandro Andrés , David Santillán , Ruben Juanes , Luis Cueto-Felgueroso

Supershear earthquakes are a particular class of seismic events in which the rupture velocity exceeds the shear wave velocity. These high-speed ruptures challenge conventional fault mechanics and have significant implications for the assessment of seismic hazards. This work investigates the relationship between pore pressure-dependent friction laws and the propagation of seismic ruptures, particularly the transition to supershear speeds. We present a numerical approach that couples fluid flow, rock deformation, and frictional contact, using stress-rate-dependent rate-and-state friction laws to simulate fault reactivation and rupture propagation. Our simulations demonstrate that the dependence of frictional properties on the effective normal stress rate can partially explain the occurrence of supershear ruptures, leading to a transition from sub-Rayleigh to supershear propagation patterns, as opposed to classical rate-and-state laws. We perform a parametric sweep, varying confining stresses, tectonic ratio, and fluid compressibility, and perform a dimensionless analysis to quantify the impact of hydromechanical parameters on supershear ruptures. Our analysis reveals that the stress drop during rupture is a key parameter in distinguishing between sub-Rayleigh and supershear rupture regimes. This study contributes to understanding the mechanisms that control fault friction behavior and its impact on seismic risk in underground reservoirs, which is crucial for the safe implementation of technologies such as green hydrogen storage and geothermal energy.

超剪切地震是破裂速度超过横波速度的一类特殊地震事件。这些高速断裂挑战了传统的断层力学，对地震危险性评估具有重要意义。这项工作研究了孔隙压力相关摩擦定律与地震破裂传播之间的关系，特别是过渡到超剪切速度。我们提出了一种耦合流体流动、岩石变形和摩擦接触的数值方法，使用与应力速率相关的速率和状态摩擦定律来模拟断层的再激活和破裂扩展。我们的模拟表明，摩擦特性对有效法向应力速率的依赖可以部分解释超剪切破裂的发生，导致从亚瑞利到超剪切传播模式的转变，而不是经典的速率-状态定律。我们进行了参数扫描、改变围应力、构造比和流体压缩性，并进行了无量纲分析，以量化流体力学参数对超剪切破裂的影响。分析表明，破裂过程中的应力降是区分亚瑞利破裂和超剪切破裂的关键参数。该研究有助于理解断层摩擦行为的控制机制及其对地下储层地震风险的影响，这对绿色储氢和地热能等技术的安全实施至关重要。

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引用次数: 0

Geotechnical performance index to validate landfill cover efficiency: Cleaner production and circular economy in the Brazilian semi-arid region 验证垃圾填埋场覆盖效率的岩土性能指标：巴西半干旱地区的清洁生产和循环经济

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-01-25 DOI: 10.1016/j.gete.2026.100795

Felipe Firmino Diniz , Jordan Carneiro Martins de Souza , Pabllo da Silva Araujo , Tuilly de Fátima Furtado Guerra , Rejane Nascentes , Luiz Moreira Coelho Junior , Veruschka Escarião Dessoles Monteiro , Márcio Camargo de Melo

The efficiency of landfill cover layers in gas retention is vital to mitigate environmental impacts, reduce biogas modeling uncertainties, and promote resource circularity and low-carbon transitions. This study applies the Geotechnical Performance Index (GPI) to evaluate the spatial relationship between geotechnical properties and greenhouse gas (GHG) emissions in a landfill in northeastern Brazil. The data was obtained through laboratory testing of the soil from the site, in situ testing at 21 points in the cover layer and physical-mechanical characterization of the soil. The GPI included parameters such as moisture (w), degree of compaction (C), dry density (γ_d), void ratio (e), porosity (n) and degree of saturation (S). Interpolate the data using QGIS®, I'Moran to analyze the spatial correlation and Global Warming Potential (GWP) analyzes. The CH₄ concentrations, of the 21 points analyzed, 95 % registered average values of less than 4 % v/v. The main CO₂ hotspot had a flow of > 300 g.m⁻².d⁻¹, while for CH₄ it was 39 g.m⁻².d⁻¹. The GPI was suitable for assessing the efficiency of the landfill cover layer, showing positive spatial correlations with CO₂ (Moran's I = 0.105) and CH₄ (Moran's I = 0.064) fluxes. Under conservative, moderate and optimistic carbon-pricing scenarios (CO_2-eq), annual revenue estimates amounted to USD 63,285, USD 189,855 and USD 632,850, respectively, which highlights the economic leverage of methane-oriented interventions. The contributions demonstrate that landfill cover performance arises from coupled geotechnical, environmental, and biogeochemical interactions; targeted interventions can therefore elicit integrated responses and strengthen decision-making for landfill management and climate change mitigation.

垃圾填埋场覆盖层的气体保留效率对于减轻环境影响、减少沼气模型的不确定性、促进资源循环和低碳转型至关重要。本研究应用岩土性能指数（GPI）对巴西东北部某垃圾填埋场岩土性能与温室气体（GHG）排放的空间关系进行了评价。这些数据是通过对现场土壤的实验室测试、覆盖层21个点的现场测试和土壤的物理力学表征获得的。GPI包括含水率(w)、压实度(C)、干密度（γd）、孔隙率(e)、孔隙率(n)和饱和度(S)等参数。使用QGIS®、I’moran对数据进行插值，分析空间相关性和全球变暖潜势（GWP）分析。分析的21个点中，95 %的CH4浓度平均值小于4 % v/v。主要的CO2热点流量为>； 300 g.m−2。而CH4为39 g.m−2.d−1。GPI与CO2 （Moran’s I = 0.105）和CH4 （Moran’s I = 0.064）通量呈空间正相关，适于评价填埋场覆盖层的效率。在保守、适度和乐观的碳定价情景（二氧化碳当量）下，年收入估计分别为63,285美元、189,855美元和632,850美元，这凸显了以甲烷为导向的干预措施的经济杠杆作用。研究表明，垃圾填埋场覆盖性能是由岩土、环境和生物地球化学相互作用引起的；因此，有针对性的干预措施可以引发综合反应，并加强垃圾填埋场管理和减缓气候变化的决策。

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引用次数: 0

Geomechanical Heterogeneity in channelized systems — How much is enough ? 渠化系统的地质力学异质性——多少才足够？

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment

Pub Date : 2026-03-01 Epub Date: 2026-02-03 DOI: 10.1016/j.gete.2026.100798

João Paulo Pereira Nunes , Gabriel Serrão Seabra

The accurate prediction of reservoir compaction and surface subsidence is critical for safe and efficient field development but is often delayed until a detailed reservoir characterization is available. This study investigates whether simplified three-dimensional geomechanical models based on bulk compositional parameters, instead of detailed geological models, can predict compaction and subsidence in channelized sandstone reservoirs. Through direct numerical simulation of an ensemble of synthetic channel systems with varying geometries and facies distribution, and statistical analysis of effective mechanical properties, we demonstrate that shale content is the primary control on the effective Young’s modulus of a sand–shale sequence, with the channel geometry having only a minimal impact on the effective modulus. Statistical analysis reveals that a model based primarily on shale fraction can predict effective Young’s modulus with high accuracy, while channel geometry parameters contribute to less than 5% to the prediction. Field-scale finite-element simulations confirm that simplified models using bulk shale content produce compaction and subsidence predictions comparable to detailed models with explicit channel representation, while significantly reducing computational and modeling requirements. Our findings enable earlier integration of geomechanical considerations in field development planning by demonstrating that detailed channel characterization, often unavailable in early project stages, is unnecessary for reliable geomechanical predictions.

储层压实和地表沉降的准确预测对于安全高效的油田开发至关重要，但通常要等到获得详细的储层特征后才能进行预测。本文研究了基于体成分参数的简化三维地质力学模型能否代替详细的地质模型来预测河道化砂岩储层的压实和沉降。通过对具有不同几何形状和相分布的合成河道系统的直接数值模拟，以及对有效力学性质的统计分析，我们证明了页岩含量是砂页岩层序有效杨氏模量的主要控制因素，而河道几何形状对有效模量的影响很小。统计分析表明，主要基于页岩组分的模型预测有效杨氏模量精度较高，而通道几何参数对预测的贡献小于5%。现场规模的有限元模拟证实，使用大块页岩含量的简化模型产生的压实和沉降预测与使用明确通道表示的详细模型相当，同时显着降低了计算和建模要求。我们的研究结果表明，对于可靠的地质力学预测来说，详细的通道特征（通常在项目早期阶段无法获得）是不必要的，因此可以在油田开发规划中更早地整合地质力学因素。

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引用次数: 0