Geoenergy Science and Engineering最新文献

Simulation study on acidizing of self-diverting acid and conventional acid in fractured carbonate rocks 裂缝性碳酸盐岩自导流酸与常规酸酸化模拟研究

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.geoen.2025.214236

Weiren Mo, Yongming Li

{"title":"Simulation study on acidizing of self-diverting acid and conventional acid in fractured carbonate rocks","authors":"Weiren Mo, Yongming Li","doi":"10.1016/j.geoen.2025.214236","DOIUrl":"10.1016/j.geoen.2025.214236","url":null,"abstract":"<div><div>Matrix acidizing is a key technology for alleviating near-wellbore damage in carbonate reservoirs. However, conventional acidizing often exacerbate formation heterogeneity due to preferential acid flow into high-permeability zones. Although self-diverting acid based on viscoelastic surfactant (SDVA) demonstrate potential for improving acid distribution, the diversion in fractured media remain unclear. This study integrates the two-scale continuum model (TSC), the 3D embedded discrete fracture model (3D-EDFM), heat transfer model, and SDVA viscosity control model to develop a numerical model for simulating SDVA acidizing in fractured carbonate reservoirs. Using this model, the SDVA acidizing process was simulated, and results aligned with existing studies, confirming high accuracy. Comparative analysis with simulation of conventional HCl acidizing revealed the following: SDVA acidizing tends to form slender, less-branched wormholes across various injection rates, with smaller the pore volume of acid required to reach the breakthrough (<span><math><mrow><msub><mrow><mi>P</mi><mi>V</mi></mrow><mrow><mi>B</mi><mi>T</mi></mrow></msub></mrow></math></span>) and lower optimum injection rates. High injection rates favor uniform dissolution. SDVA effectively reduces acid leakage along natural fractures, demonstrating stronger diversion suppression in low-permeability fractures. The heat from SDVA acid-rock reactions concentrates near wormhole regions, and elevated initial rock temperatures weaken self-diverting effects. In fractured cores, SDVA and HCl produce similar wormhole morphology under low porosity; As porosity increases, diversion advantages of SDVA emerge, enhancing effective acid penetration distance. As injection rates increase, the propagation mechanism shifts from pore-structure-dominated wormholes to fracture-dominated paths, particularly in reservoirs with well-developed, interconnected fracture networks.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214236"},"PeriodicalIF":4.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study of interference and competition mechanism of multi-cluster fractures in hydrate-bearing sediments 含水沉积物多簇裂缝干扰竞争机制实验研究

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.geoen.2025.214233

Jinxin Liu , Yi Zhang , Xiaolong Ma , Houzhen Wei , Yongping Yu , Yan Zhao , Congshan Zhang

{"title":"Experimental study of interference and competition mechanism of multi-cluster fractures in hydrate-bearing sediments","authors":"Jinxin Liu , Yi Zhang , Xiaolong Ma , Houzhen Wei , Yongping Yu , Yan Zhao , Congshan Zhang","doi":"10.1016/j.geoen.2025.214233","DOIUrl":"10.1016/j.geoen.2025.214233","url":null,"abstract":"<div><div>During the stimulation of hydrate-bearing sediment reservoirs, multi-cluster hydraulic fracturing has demonstrated superior stimulation effects and enhanced gas production rates compared to single-cluster hydraulic fracturing by establishing artificial fracture networks. However, due to limitations in experimental equipment, research on the mechanisms of interference and competition among multi-cluster fractures in hydrate-bearing sediments has predominantly relied on numerical simulations, with experimental studies being nearly non-existent. To address this gap, this paper presents the independent development of a multi-cluster fracturing experimental system specifically designed for hydrate-bearing sediments, and conducts a series of multi-cluster hydraulic fracturing experiments. The study investigates the influences of hydrate saturation, initial stress state, injection rate, and clay mineral type on the competition and interference mechanisms among multi-cluster fractures. The results indicate that a slight increase in hydrate saturation creates a favorable environment for fracture development, reduces fluid loss in upper fractures, and significantly enhances the energy available for the development of the second cluster, thereby improving fracture quality. However, further increases in hydrate saturation result in the preferential allocation of fluid for the development of the first cluster, forming a dominant pathway and complicating the initiation of the second cluster. Under low injection rate conditions, both clusters initiate, albeit with average fracture quality. An increase in the injection rate intensifies competition among fractures, leading to improved quality of upper fractures that tend to propagate along the path of least resistance, thereby placing the second cluster at a disadvantage in the competition.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214233"},"PeriodicalIF":4.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of foam flooding for residual oil production in granitoid cores from the “X” oil field in Kazakhstan 泡沫驱在哈萨克斯坦X油田花岗岩心剩余油开采中的应用

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-29 DOI: 10.1016/j.geoen.2025.214237

Sotirios Nik. Longinos , Stepan Verendeyev , Dastan Begaliyev , Randy Hazlett

{"title":"Application of foam flooding for residual oil production in granitoid cores from the “X” oil field in Kazakhstan","authors":"Sotirios Nik. Longinos , Stepan Verendeyev , Dastan Begaliyev , Randy Hazlett","doi":"10.1016/j.geoen.2025.214237","DOIUrl":"10.1016/j.geoen.2025.214237","url":null,"abstract":"<div><div>Foam has been recognized as a diverting agent that enhances sweep efficiency. Foam flooding is also speculated to improve microscopic displacement efficiency in the reservoir core by the same mechanism. Incremental recovery of remaining oil in \"X\" oilfield core following sequential waterflooding and immiscible gas flooding is investigated using foam with both N<sub>2</sub> and CO<sub>2</sub>.</div><div>Limited laboratory tests on \"X\" oilfield core indicated excellent enhanced oil recovery (EOR) potential by foam processes, with and without the inclusion of nanoparticles. The recovery process sequence was repeated with Berea and Indiana limestone for comparison. The baseline analyses for gas flooding across all lithologies indicated that immiscible CO<sub>2</sub> flooding is more efficient than N<sub>2</sub> flooding, presumably due to increased interaction mechanisms for CO<sub>2</sub> with both water and oil. Without the incorporation of nanoparticles, N<sub>2</sub> foam flooding was superior to CO<sub>2</sub> foam, as seen from the average enhanced recovery of 8.15 % of Original Oil in Place (OOIP) for the \"X\" core samples using N<sub>2</sub> foam compared to 2.45 % with CO<sub>2</sub> foam. The superior performance of N<sub>2</sub> foam was consistent also with Berea and Indiana limestone tests. Additionally, the introduction of nanoparticles to the foam system further improved recovery, with an average increase of 5.05 % in the recovery factor. However, the greater apparent viscosity of the N<sub>2</sub> foam with nanoparticles (around 9 cP) is undesirable, since it might impair injectivity and interwell mobility despite significant recovery efficiency improvement. Overall, the study results show that foam flooding is a promising option for sweep efficiency improvement in \"X\" oilfield core.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214237"},"PeriodicalIF":4.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A mild oxidation cleavage-and-polymerization strategy towards sulfonate-modified carbon dots for enhanced oil recovery 硫酸盐改性碳点的轻度氧化裂解聚合策略提高石油采收率

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-25 DOI: 10.1016/j.geoen.2025.214218

Jialin Li , Luming Meng , Zhongtao He , Xuan Han , Caili Dai , Wenting Wu , Qingshan Zhao , Bin Yuan , Yining Wu

{"title":"A mild oxidation cleavage-and-polymerization strategy towards sulfonate-modified carbon dots for enhanced oil recovery","authors":"Jialin Li , Luming Meng , Zhongtao He , Xuan Han , Caili Dai , Wenting Wu , Qingshan Zhao , Bin Yuan , Yining Wu","doi":"10.1016/j.geoen.2025.214218","DOIUrl":"10.1016/j.geoen.2025.214218","url":null,"abstract":"<div><div>As a new type of oil displacement agent, carbon dots (CDs) with ultrasmall size show great potential in developing unconventional reservoirs. However, the complex synthesis process, high energy consumption, and difficulty in surface modification restrict their practical applications. Herein, we propose a facile and mild oxidation cleavage-polymerization strategy for engineering sulfonate-modified carbon dots (sm-CDs) based on a low-temperature hydrothermal technology for enhanced oil recovery (EOR). This methodology employs humic acid as the carbonaceous precursor and sodium sulfamate as the sulfonation agent, utilizing hydrogen peroxide-mediated oxidative initiation under mild hydrothermal conditions (90 °C). The synthetic method achieves concurrent oxidative cleavage of humic acid macromolecules and subsequent polycondensation with sulfonation moieties, enabling one-step in situ functionalization of CDs with modified surface sulfonate groups. The sm-CDs demonstrate outstanding performance in dispersion stability under extreme reservoir conditions (high-temperature: 90 °C and high salinity: 5 × 10<sup>4</sup> mg/L NaCl), and the interfacial activity. Core flooding tests show that 0.2 wt% sm-CDs nanofluid significantly reduces the injection pressure by 62.15 % and increases the oil recovery from 48.14 % to 63.92 % compared with water flooding. Subsequent investigation indicates the tailored sm-CDs adsorb on core surface, which improves the heterogeneity of wettability and decreases the average oil-rock adhesion forces from 1.621 to 0.091 nN, thereby effectively enhancing the oil displacement. This study provides a valuable reference for the development and application of efficient CDs nanomaterials in the oilfield.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214218"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing performance of aquifer-based underground hydrogen storage via numerical simulation with cushion gas optimization 缓冲气优化数值模拟提高含水层地下储氢性能

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-25 DOI: 10.1016/j.geoen.2025.214231

Zhenhui Bi , Yintong Guo , Chunhe Yang , Lei Wang , Yuting He , Wuhao Guo , Hanzhi Yang

{"title":"Enhancing performance of aquifer-based underground hydrogen storage via numerical simulation with cushion gas optimization","authors":"Zhenhui Bi , Yintong Guo , Chunhe Yang , Lei Wang , Yuting He , Wuhao Guo , Hanzhi Yang","doi":"10.1016/j.geoen.2025.214231","DOIUrl":"10.1016/j.geoen.2025.214231","url":null,"abstract":"<div><div>Hydrogen energy is preferred by several countries as a significant component of the energy transition aimed at reducing the release of greenhouse gases. Large-scale underground hydrogen storage (UHS) can be utilized to meet energy demands. Aquifers have garnered considerable attention as highly viable locations for hydrogen storage. However, there remains a lack of understanding regarding the role of cushion gas, which can significantly impact the hydrogen storage performance of aquifers. This study analyzes various factors, including the type of cushion gas, injection rate, and injection period. As a result, the potential for using mixed gas as a cushion gas is suggested. Through the above analyses, the following insights are obtained: (1) The introduction of cushion gas exerted a significant impact on the cumulative gas production volume, recovery efficiency, and gas molar fraction of hydrogen. (2) A moderate increase in the injection rate of cushion gas could enhance the cumulative gas production volume and recovery efficiency. (3) The impact of the injection period of the cushion gas on the hydrogen storage performance of the aquifer was minimal without considering the gas-aquifer interaction. (4) The gas-aquifer interaction was unfavorable for UHS. Exploring alternative methods to mitigate the gas-aquifer interaction is essential for enhancing the performance of UHS. (5) A gas mixture (CH<sub>4</sub>: CO<sub>2</sub> = 1 : 1) could improve the recovery efficiency and gas mole fraction to a certain degree. These findings help to guide the selection of cushion gas type and the optimal operating strategy.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214231"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rock physics and petrophysical evaluation of diagenetic effects in the Broom Creek CO2 sequestration site Broom Creek CO2封存区成岩作用的岩石物理与岩石物理评价

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-20 DOI: 10.1016/j.geoen.2025.214229

Prasad Pothana , Kegang Ling , Richard A. Schultz

{"title":"Rock physics and petrophysical evaluation of diagenetic effects in the Broom Creek CO2 sequestration site","authors":"Prasad Pothana , Kegang Ling , Richard A. Schultz","doi":"10.1016/j.geoen.2025.214229","DOIUrl":"10.1016/j.geoen.2025.214229","url":null,"abstract":"<div><div>The Pennsylvanian–Permian Broom Creek Formation, a deep saline aquifer in the Williston Basin, North Dakota, is an important target for large-scale CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> sequestration. Preserving long-term CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> storage integrity in this reservoir hinges on a systematic assessment of how geological and diagenetic processes modify rock properties. This study investigates the impact of diagenetic alterations on the elastic properties of the Broom Creek sandstone through an integrated rock physics modeling approach. Multi-mineral petrophysical evaluation was conducted using geophysical well logs calibrated with X-ray diffraction and cuttings data. Rock physics models, including the contact cement, soft-sand, and stiff-sand models, were employed to establish diagenetic trends in compressional wave velocity and porosity space. Velocity-porosity trends and mineral volume fractions data were then used to quantify the contributions of contact cement and pore-filling materials to the rock framework. The findings reveal Upper Broom Creek eolian quartz arenite deposits exhibit diagenetic contact cementation by quartz overgrowths and dolomite, which stiffen the rock matrix while preserving porosity and permeability. In the lower, near-shore sandstone intervals of the formation, quartz overgrowths and dolomite cementation persist, but pore-filling anhydrite and clay dominate as non-contact cements. These results provide understanding into the mechanical properties of the reservoir and the role of diagenesis in modifying porosity and stiffness. The study’s outcomes are useful for modeling CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>-brine-rock interactions and evaluating the long-term stability and effectiveness of CO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> sequestration in the Broom Creek Formation.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214229"},"PeriodicalIF":4.6,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ManyWells: Simulation of multiphase flow in thousands of wells 多井：在数千口井中模拟多相流

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-20 DOI: 10.1016/j.geoen.2025.214226

Bjarne Grimstad , Erlend Lundby , Henrik Andersson

引用次数: 0

Effect of dynamic expansion of interface micro-annulus on casing failure mechanism during multistage fracturing 多级压裂中界面微环空动态膨胀对套管破坏机理的影响

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-19 DOI: 10.1016/j.geoen.2025.214227

Rui Sun, Dan Huang, Xuehao Yao, Zhuang Cai

{"title":"Effect of dynamic expansion of interface micro-annulus on casing failure mechanism during multistage fracturing","authors":"Rui Sun, Dan Huang, Xuehao Yao, Zhuang Cai","doi":"10.1016/j.geoen.2025.214227","DOIUrl":"10.1016/j.geoen.2025.214227","url":null,"abstract":"<div><div>The cyclic loads generated by multistage fracturing often affect the sealing integrity of the cement sheath, which in turn causes casing failure. Due to the difficulty in accurately describing the stress state in the cement sheath, the interacting mechanism between the sealing integrity of the cement sheath and the failure of the casing is still unclear. In this work, the fatigue damage cohesion model under cyclic loads is constructed by introducing the fatigue damage calculation criterion into the cohesive zone model (CZM). The effectiveness of the fatigue damage cohesive zone model is verified by the simulation results of double cantilever beam (DCB). Subsequently, by comparing the model results with the existing literature results, it is confirmed that the constructed fatigue damage cohesive zone model can be used to study the casing failure caused by cement sheath sealing integrity. The influence of the dynamic evolution of micro-annulus on casing failure is analyzed from the two key factors of casing eccentricity and wear. On this basis, potential strategies to mitigate casing failure are proposed, focusing on aspects such as fracturing well section selection, construction pressure and cementing quality. A case analysis of a shale gas well in a cementing quality cooperation in Weirong block in southwest China is conducted using the proposed fatigue damage cohesive zone model. The findings of this study provide valuable insights into improving wellbore sealing integrity and preventing casing failure during multistage fracturing operations.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214227"},"PeriodicalIF":4.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research progress of geothermal mining and carbon dioxide sequestration: multi-field coupling effect, synergy and optimization method 地热开采与二氧化碳封存研究进展：多场耦合效应、协同效应及优化方法

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-18 DOI: 10.1016/j.geoen.2025.214224

Yuanxiu Sun , Yuanyuan Li , Yangfan Tang , Shuai Xie , Yue Wang , Songqi Li

{"title":"Research progress of geothermal mining and carbon dioxide sequestration: multi-field coupling effect, synergy and optimization method","authors":"Yuanxiu Sun , Yuanyuan Li , Yangfan Tang , Shuai Xie , Yue Wang , Songqi Li","doi":"10.1016/j.geoen.2025.214224","DOIUrl":"10.1016/j.geoen.2025.214224","url":null,"abstract":"<div><div>With the escalating global demand for clean energy and the mounting pressure of carbon emission reduction, the synergistic approach of carbon dioxide sequestration in geothermal mining has gradually emerged as the current research hotspots. Studying this technology under multi-field coupling condition is crucial for efficient geothermal mining and carbon dioxide sequestration. From the perspective of multi-physical field coupling, the synergistic storage technology and optimization path of carbon dioxide geothermal mining are investigated, and the research progress in this field is also clarified.Initially, the mechanism of geothermal mining and sequestration with carbon dioxide are introduced. On this basis, we further explore the effects of various factors on the synergistic carbon sequestration in geothermal mining under a multi-field coupling mechanism. Finally, three different optimization methods based on injection-production schemes, reservoir structure and numerical simulation are proposed. Furthermore, the current challenges and future development directions of the synergistic sequestration technology for geothermal mining with carbon dioxide as the medium are summarized in this paper. The research presented in this paper provides vital theoretical basis and technical support for promoting the sustainable development of geothermal resources and accelerating the carbon dioxide emission reduction.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214224"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid CNN-LSTM model for predicting wettability alterations in shale reservoir based on experimental techniques 基于实验技术的页岩储层润湿性变化预测CNN-LSTM混合模型

IF 4.6

Geoenergy Science and Engineering Pub Date : 2025-09-18 DOI: 10.1016/j.geoen.2025.214217

Mohammed Ali Badjadi , Haiyan Zhu , Peng Zhao , Fengshou Zhang , Dali Hou , Liang Huang , Marembo Micheal

{"title":"Hybrid CNN-LSTM model for predicting wettability alterations in shale reservoir based on experimental techniques","authors":"Mohammed Ali Badjadi , Haiyan Zhu , Peng Zhao , Fengshou Zhang , Dali Hou , Liang Huang , Marembo Micheal","doi":"10.1016/j.geoen.2025.214217","DOIUrl":"10.1016/j.geoen.2025.214217","url":null,"abstract":"<div><div>The study proposes a hybrid model from Convolutional Neural Networks (CNN) and Long Short-Term Memory (LSTM) for the optimization of CO<sub>2</sub> sequestration in low clay or organic content, brittle, quartz-rich, siliceous shale reservoirs. The model solves the problem of wettability prediction under the low permeability of shale and complex fractures, which triggers high computational complexity and low generalization of conventional and existing machine learning methods. Using quartz as a proxy for siliceous shale, we train the model with CT scan data, SEM, high-speed camera images, and geomechanical measurements under supercritical CO<sub>2</sub> (SC-CO<sub>2</sub>) and water injection conditions. SC-CO<sub>2</sub> injection increases quartz porosity by 4.0 % and reverses wettability to hydrophobic in order to expand storage capacity, but decreases caprock sealing. Water injection increases porosity by 2.8 %, doubles permeability, and promotes hydrophilic wettability to favor CO<sub>2</sub> trapping. The model achieves 92 % accuracy (F1-score 0.905 for hydraulic fractures) and low error rates (MSE 0.015 for porosity, 0.018 for wettability) with real-time CO<sub>2</sub> injection optimization possible. Validation in organic- and clay-rich reservoirs would be required for broader applicability, but for siliceous shales, the model is remarkably adequate.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"257 ","pages":"Article 214217"},"PeriodicalIF":4.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0