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Optimization of Gas Production from Hydrate-Bearing Sediments with Fluctuation Characteristics

Journal of Ocean University of China 2024年第3期23卷 618-632页

作者： LI Yaobin XU Tianfu XIN Xin YU Han yuan yilong ZHU Huixing Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun 130021China

As an important source of low-carbon,clean fossil energy,natural gas hydrate plays an important role in improving the global energy consumption *** the hydrate industry in the South China Sea is important to achieving‘carbon peak and carbon neutrality’goals as soon as ***-water areas subjected to the action of long-term stress and tectonic movement have developed complex and volatile terrains,and as such,the morphologies of hydrate-bearing sediments(HBSs)fluctuate *** key to numerically simulating HBS morphologies is the establishment of the conceptual model,which represents the objective and real description of the actual geological ***,current numerical simulation models have characterized HBSs into horizontal strata without considering the fluctuation *** representing the HBS as a horizontal element reduces simulation ***,the commonly used horizontal HBS model and a model considering the HBS’s fluctuation characteristics with the data of the SH2 site in the Shenhu Sea area were first constructed in this ***,their production behaviors were compared,and the huge impact of the fluctuation characteristics on HBS production was *** this basis,the key parameters affecting the depressurization production of the fluctuating HBSs were studied and *** research results show that the fluctuation characteristics have an obvious influence on the hydrate production of HBSs by affecting their temperatures and pressure distributions,as well as the transmission of the pressure drop and methane gas ***,the results show that the gas productivity of fluctuating HBSs was about 5%less than that of horizontal *** optimizing the depressurization amplitude,well length,and layout location of vertical wells,the productivity of fluctuating HBSs increased by about 56.6%.

关键词： natural gas hydrate numerical simulation fluctuation characteristics depressurization production production well optimization

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Effect of movability of water on the low-velocity pre-Darcy flow in clay soil

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3299-3310页

作者： Hui Cheng Fugang Wang Shengwei Li Xiaotong Guan Guohua Yang Zhongle Cheng Ceting Yu yilong yuan Guanhong Feng Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun130012China Jilin Provincial Key Laboratory of Water Resources and Water Environment Jilin UniversityChangchun130012China Chengdu Center China Geological SurveyChengdu610081China

Water seepage in soil is a fundamental problem involving various scientific and engineering *** to the literature,low-velocity water seepage in low-permeability porous media,such as clay,does not follow Darcy's law,also known as pre-Darcy *** formation of immovable water due to water adsorption on the pore wall is believed to be responsible for the formation of pre-Darcy ***,this view lacks direct solid *** investigate the pre-Darcy water flow in clay,head permeability experiments are conducted on six clay samples with different *** results indicate that water seepage in clay at low hydraulic gradients does not follow Darcy's law.A clear nonlinear relationship between flow velocity and hydraulic gradient is *** flow in clay can be divided into the pre-Darcy flow and Darcy flow regions by the critical hydraulic gradient,which is 10-12 for the Albic soil with dry density between 1.3 g/cm^(3)and 1.8 g/cm^(3).According to the disjoining pressure theory,immovable water due to water adsorption on the pore wall is the primary reason for water flow deviating from Darcy's law in *** results indicate that the percentage of movable water ranges from 39.7%to 59.3%for the six samples at a hydraulic gradient of *** the hydraulic gradient increases,the percentage of moveable water also ***,there is a strong correlation between the percentage of movable water and the variation in hydraulic conductivity with the hydraulic ***,a quantitative relationship between the percentage of movable water and the hydraulic conductivity has been *** results of this study suggest that water adsorption on the pore wall not only affects the water movability,but is also closely related to the pre-Darcy flow phenomenon in clay.

关键词： Pre-Darcy flow Clay Critical hydraulic gradient Water movability analysis

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应力加载对花岗岩粗糙裂隙渗透率影响规律

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地球科学 2024年第5期49卷 1810-1820页

作者：那金谢康路袁可涵袁益龙油气地球化学与环境湖北省重点实验室(长江大学资源与环境学院) 湖北武汉430100 吉林大学地下水资源与环境教育部重点实验室吉林长春130021

本研究选取青海共和盆地干热岩靶区储热层印支期花岗岩为目标层,利用高压流体驱替实验装置开展岩心裂隙渗流-应力耦合下循环加卸载试验,分析应力加载过程对花岗岩粗糙裂隙渗透率影响规律,并通过数值模拟技术分析实验过程中花岗岩裂隙渗... 详细信息

本研究选取青海共和盆地干热岩靶区储热层印支期花岗岩为目标层,利用高压流体驱替实验装置开展岩心裂隙渗流-应力耦合下循环加卸载试验,分析应力加载过程对花岗岩粗糙裂隙渗透率影响规律,并通过数值模拟技术分析实验过程中花岗岩裂隙渗透率的演化特征.研究结果表明:(1)应力加载导致裂隙接触面产生变形,是影响裂隙渗流的主要因素,裂隙渗透率与围压呈负相关关系;(2)裂隙渗透率对不同应力加载模式敏感性存在差异;(3)在试验基础上得出数学经验公式,并通过数值模拟分析花岗岩裂隙通道内渗流演化规律,模拟结果同实验拟合较好.

关键词：花岗岩应力加载裂隙渗透率渗流-应力耦合数值模拟地热能源

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干热岩地热能开发技术挑战与发展战略

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地球科学 2024年第6期49卷 2131-2147页

作者：许天福文冬光袁益龙吉林大学地下水资源与环境教育部重点实验室吉林长春130021 中国地质调查局水文地质环境地质调查中心天津300304

为推动我国干热岩地热开发取得新突破,形成一批干热岩开发示范区域,支撑国家能源结构调整和“双碳”目标实现,总结归纳了推进干热岩商业化开发的底层技术、关键技术以及前沿和颠覆性技术.根据国内外干热岩勘查、开发利用现状,结合青海... 详细信息

为推动我国干热岩地热开发取得新突破,形成一批干热岩开发示范区域,支撑国家能源结构调整和“双碳”目标实现,总结归纳了推进干热岩商业化开发的底层技术、关键技术以及前沿和颠覆性技术.根据国内外干热岩勘查、开发利用现状,结合青海共和干热岩试采科技攻坚战实践,将干热岩地热资源评价与选址、干热岩高效低成本钻井技术、干热岩地热利用技术定为底层技术;干热岩体精细勘查与刻画、高效复杂裂隙网络储层建造技术、有效微地震控制技术、裂缝网络连通与储层表征技术定为关键核心技术;井下液体爆炸造缝技术、井下原位高效换热发电技术、CO_(2)等不同工质换热发电技术列为前沿和颠覆性技术.

关键词：干热岩增强型地热系统工程示范研究进展技术挑战环境地质学

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深部超临界地热条件下纯水的电阻和电导演变特征

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地球物理学进展 2024年第2期39卷 490-497页

作者：钟承昊许天福袁益龙封官宏吉林大学地下水资源与环境教育部重点实验室长春130021

通过测定纯水在300~500℃和30~50 MPa条件下的电阻,揭示了纯水电阻和电导由亚临界区进入超临界区的变化特征.在此基础上,探讨了超临界水电阻和电导随温度和压力变化的演变机理.结果表明,纯水电导值在超临界点(374℃,22.1 MPa)附近具有... 详细信息

通过测定纯水在300~500℃和30~50 MPa条件下的电阻,揭示了纯水电阻和电导由亚临界区进入超临界区的变化特征.在此基础上,探讨了超临界水电阻和电导随温度和压力变化的演变机理.结果表明,纯水电导值在超临界点(374℃,22.1 MPa)附近具有涨落现象,具体表现为:(1)在亚临界区电导值与温度具有正相关关系,这是由于H+和OH-的极限当量电导之和随温度升高而上升所导致;(2)进入超临界区后电导值与温度具有负相关关系,这是由于水的密度和解离常数随温度上升而降低所导致.此外,固定温度条件下,纯水电导值与压力始终保持正相关关系.本次研究可为深部超临界地热资源地球物理勘探和解译提供基础数据.

关键词：超临界地热高温高压电阻电导水热实验

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不同冷却速率下干热花岗岩渗透率演化特征对比研究

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岩石力学与工程学报 2024年第2期43卷 385-398页

作者：朱振南王殿永杨圣奇解经宇袁益龙吴廷尧田文岭孙博文田红陈劲中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221116 中国矿业大学力学与土木工程学院江苏徐州221116 中国地质大学(武汉)教育部岩土钻掘与防护教育部工程研究中心湖北武汉430074 吉林大学地热资源开发技术与装备教育部工程研究中心吉林长春130026 西南交通大学土木工程学院四川成都610031 中建桥梁有限公司重庆402260 中国矿业大学资源与地球科学学院江苏徐州221116 重庆大学土木工程学院重庆400045

深部干热岩地热开采过程中向高温储层注入低温水,将会改变储层岩石渗透率,进而直接影响增强型地热系统(enhanced geothermal system,EGS)采热效率。为探究遇水冷却下干热花岗岩渗透率变化规律及演化机制,利用岩石全自动气体渗透率测试... 详细信息

深部干热岩地热开采过程中向高温储层注入低温水,将会改变储层岩石渗透率,进而直接影响增强型地热系统(enhanced geothermal system,EGS)采热效率。为探究遇水冷却下干热花岗岩渗透率变化规律及演化机制,利用岩石全自动气体渗透率测试系统进行不同冷却速率下干热花岗岩渗透率演化测试,分析围压和加载方式对花岗岩渗透率的影响规律,并采用偏光显微镜和计算机断层扫描进行干热花岗岩细观结构观测,探讨其二维和三维微观结构变化特征,揭示其渗透率演化机制。试验结果表明:(1)不同冷却速率下干热花岗岩渗透率和渗透流量随温度的升高逐渐增大,且遇水冷却条件下花岗岩渗透率和渗透流量总是大于自然冷却条件下的值,而最小渗透压力则呈现相反的趋势。(2)不同冷却速率下花岗岩试样的二维微裂纹密度和平均宽度、三维孔隙率均随温度的升高而不断增加,且遇水冷却条件下微裂纹密度、平均宽度和孔隙率的值均大于自然冷却条件下的值。(3)不同冷却速率下花岗岩渗透率的变化主要与岩石内部微裂纹的演化有关,而岩石内部微裂纹的演化主要是由于矿物非均匀膨胀和内部物理化学反应所引起的,遇水冷却促进其渗透率进一步提高。(4)随着围压的增大,不同冷却速率下干热花岗岩渗透率呈负指减小的趋势,卸荷作用下花岗岩渗透率远小于加载作用下的值。研究结果期望揭示深部干热岩地热开采过程中渗透率演化机制,并为EGS采热模拟提供可靠的参数。

关键词：岩石力学渗透率花岗岩冷却速率细观结构卸荷地热能

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Sensitivity Analysis of Multi-phase Seepage Parameters Affecting the Clayey Silt Hydrate Reservoir Productivity in the Shenhu Area,South China Sea

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Acta Geologica Sinica(English Edition) 2023年第6期97卷 1787-1800页

作者： LI Yaobin XU Tianfu XIN Xin ZANG Yingqi ZHU Huixing yuan yilong Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China

Natural gas hydrate(NGH)is an important future resource for the 21st century and a strategic resource with potential for commercial development in the third energy *** is of great significance to accurately predict the productivity of hydrate-bearing sediments(HBS).The multi-phase seepage parameters of HBS include permeability,porosity,which is closely related to permeability,and hydrate saturation,which has a direct impact on hydrate *** research has shown that these multi-phase seepage parameters have a great impact on HBS *** directly affects the transmission of pressure-drop and discharge of methane gas,porosity and initial hydrate saturation affect the amount of hydrate decomposition and transmission process of pressure-drop,and also indirectly affect temperature variation of the *** the spatial heterogeneity of multi-phase seepage parameters,a depressurization production model with layered heterogeneity is established based on the clayey silt hydrate reservoir at W11 station in the Shenhu Sea area of the South China ***+Hydrate software was used to calculate the production model;the process of gas production and seepage parameter evolution under different multi-phase seepage conditions were obtained.A sensitivity analysis of the parameters affecting the reservoir productivity was conducted so that:(a)a HBS model with layered heterogeneity can better describe the transmission process of pressure and thermal compensation mechanism of hydrate reservoir;(b)considering the multi-phase seepage parameter heterogeneity,the influence degrees of the parameters on HBS productivity were permeability,porosity and initial hydrate saturation,in order from large to small,and the influence of permeability was significantly greater than that of other parameters;(c)the production potential of the clayey silt reservoir should not only be determined by hydrate content or seepage capacity,but also by the comprehen

关键词： energy resources natural gas hydrate sensitivity analysis seepage parameters clayey silt reservoir Pearl River Mouth Basin

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Bioinformatic approaches of liquid–liquid phase separation in human disease

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中华医学杂志(英文版) 2024年第16期137卷 2024 Jul 19页

作者： Sun Jun Chen yilong Bi Ruiye yuan Yong Yu Haopeng Department of Thoracic Surgery and West China Biomedical Big Data Center West China Hospital Sichuan University Chengdu Sichuan China Med-X Center for Informatics Sichuan University Chengdu Sichuan China Department of Orthognathic and TMJ Surgery State Key Laboratory of Oral Diseases National Clinical Research Center for Oral Diseases West China Hospital of Stomatology Sichuan University Chengdu Sichuan China

Biomolecular aggregation within cellular environments via liquid–liquid phase separation (LLPS) spontaneously forms droplet-like structures, which play pivotal roles in diverse biological processes. These structures are closely associated with a range of diseases, including neurodegenerative disorders, cancer and infectious diseases, highlighting the significance of understanding LLPS mechanisms for elucidating disease pathogenesis, and exploring potential therapeutic interventions. In this review, we delineate recent advancements in LLPS research, emphasizing its pathological relevance, therapeutic considerations, and the pivotal role of bioinformatic tools and databases in facilitating LLPS investigations. Additionally, we undertook a comprehensive analysis of bioinformatic resources dedicated to LLPS research in order to elucidate their functionality and applicability. By providing comprehensive insights into current LLPS-related bioinformatics resources, this review highlights its implications for human health and disease.

关键词： Phase separation Liquid–liquid phase separation Disease Phase separation databases Bioinformatic tools

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Improved Preproduction Conceptual-Numerical Model of the Roosevelt Geothermal Field using Geological, Geochemical and Structural Information

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1805-1815页

作者： YU Han XU Tianfu yuan yilong FENG Guanhong Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun 130021China Engineering Research Center of Geothermal Resources Development Technology and Equipment Ministry of EducationJilin UniversityChangchun 130026China

The Roosevelt Hot Springs Known Geothermal Resource Area(KGRA) is a Basin and Range-type geothermal resource, which is located in southwestern Utah. The integrated multicomponent geothermometry(IMG) approach is used to estimate the reservoir temperature at the Roosevelt Hot Springs KGRA. Geothermometric modeling results indicate the deep reservoir temperature is approximately 284.6°C. A conceptual model of the Roosevelt Hot Spring KGRA is provided through integrating the various pieces of exploration information, including the geological data, geothermometric results, temperature well log and field evidence. A two-dimensional cross-sectional model was thus built to quantitatively investigate the coupled thermal-hydraulic processes in the Roosevelt geothermal field. By matching the preproduction temperature log data of deep wells, parameters controlling flow and heat transport are identified. The method and model presented here may be useful for other geothermal fields with similar conditions.

关键词： geothermal resource Roosevelt Hot Springs integrated multicomponent geothermometry preproduction state modeling

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Hydraulic Conductivity Characteristics of Hot Dry Rocks under Different Fracture Modes

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1915-1925页

作者： LIU Xin FENG Bo LIU Yulong yuan yilong Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun 130021China

Enhanced geothermal system(EGS) is an effective method for developing and utilizing hot dry rock(HDR). The key to the effectiveness of EGS is the construction of an artificial fracture network. The permeability of fractures has severe effects on the heat transfer efficiency and sustainability of geothermal energy. However, the evolution characteristics of hydraulic conductivity under different failure modes have not been adequately studied for HDR. To clarify this, rocks with different failure modes were investigated by conducting thermal triaxial compression experiments, and the fluid seepage related to different rock failure modes was comprehensively investigated. The results showed that the characteristic stresses and crack surface roughness of the rock increased as the confining pressure increased. The permeability in the composited failure mode was the largest(11.4 μm;), followed by that in the Y-shaped shear failure mode(9.7 μm;), and that in the single-shear failure mode was the smallest(7.2 μm;). The confining pressures had an inhibitory effect on permeability. As the confining pressure increased from 5 to 30 MPa, the permeability decreased by 88.8%, 88.4%, and 89.9%, respectively. In contrast, the permeability was significantly enhanced by 128.3%, 94.6%, and 131% as the flow rate increased from 3 to 7 m L/min.

关键词： EGS hydraulic conductivity permeability experiment failure mode hot dry rock

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