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Marker-and-cell and Chorin finite difference modeling for fluid flow in a single fracture

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Earthquake Science 2009年第5期22卷 499-504页

作者： duoxing yang Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

It is important to set up a detailed dynamic model of the fluid flow through fractures for understanding many fluid processes in Earth sciences. Numerical simulation is a popular tool for exploring these processes. The objective of this study is to understand fluid flow in fractures. Contrary to the conventional macro-scale modeling approach, micro-scale simulation is carried out. The Navior-Stokes equation solver was developed by a staggered marker-and-cell and the Chorin pressure iterating finite difference approach. We analyze the effects of the Reynolds number and the frequency of pressure fluctuations on flow mainly through visualization. A significant result is that the effect of pressure fluctuation-induced fluid flow can be observed in a broader frequency range. The peak velocity shifts along the spatial axis depending upon the frequency of the pressure fluctuation. An effective frequency band of the pressure fluctuation was identified which dominates dynamic behavior of the flow. Another major finding is that there exits a critical frequency of the pressure fluctuation which controls approximately the flow dynamic behavior. We conclude that it is only possible to estimate the flow behavior from pressure fluctuation, if effective frequency range is properly accounted for.

关键词： marker-and-cell frequency pressure fluctuation Reynolds number

Transport of airborne particulate matters originating from Mentougou, Beijing, China

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China Particuology 2007年第6期5卷 408-413页

作者： duoxing yang Yongwei Han Jixi Gao Jesse Thé institute of Crust Dynamics CEA Beijing 100085 China Chinese Academy of Environmenial Sciences Beijing 100012 China Lakes Environmental Software Inc. 419-3 Phillips St. Waterloo ON N2L 3X2 Canada

In this study, a coupled regional air quality modeling system is applied to investigate the time spatial variations in airborne particulate matters （PM10）, originating from Mentougou to Beijing municipal area in the period of April 1-7, 2004, and the influences of complex terrain and meteorological conditions upon boundary layer structure and PM10 concentration distributions. An intercomparison of the performance with CALPUFF against the observed data is presented and an examination of scatter plots is provided. The statistics show that the correlation coefficient and STD between the modeled and observed data are 0.86 and 0.03, respectively. Analysis of model results illustrates that the pollutants emitted from Mentougou can be transported to Beijing municipal area along certain transport pathways, and PM10 concentration distributions show heterogeneity characteristics. Contributions of the Mentougou sources to the PM10 concentrations in Beijing municipal area are up to 0.1-15 μg/m^3.

关键词： Airborne particulate matters CALPUFF PM10 SMOKE Emission inventory

Deformation and failure characteristics of sandstone under uniaxial compression using distributed fiber optic strain sensing

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1046-1055页

作者： Lingfan Zhang duoxing yang Zhonghui Chen Aichun Liu Institute of Crustal Dynamics China Earthquake AdministrationBeijing100085China College of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing100083China

This paper investigates the deformation and fracture propagation of sandstone specimen under uniaxial compression using the distributed fiber optic strain sensing(DFOSS)*** shows that the DFOSS-based circumferential strains are in agreement with the data monitored with the traditional strain *** DFOSS successfully scans the full-field view of axial and circumferential strains on the specimen *** spatiotemporal strain measurement based on DFOSS manifests crack closure and elastoplastic deformation,detects initialization of microcrack nucleation,and identifies strain localization within the *** DFOSS well observes the effects of rock heterogeneity on rock *** advantage of DFOSS-based strain acquisition includes the high spatiotemporal resolution of signals and the ability of full-surface strain *** introduction to the DFOSS technology yields a better understanding of the rock damage process under uniaxial compression.

关键词： Distributed fiber optic strain sensing (DFOSS) Uniaxial compression Strain localization

Laboratory core flooding experimental systems for CO_2 geosequestration: An updated review over the past decade

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第1期8卷 113-126页

作者： Yankun Sun Qi Li duoxing yang Xuehao Liu State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Key Laboratory of Crustal Dynamics Institute of Crustal Dynamics China Earthquake Administration

Carbon dioxide(CO2) geosequestration in deep saline aquifers has been currently deemed as a preferable and practicable mitigation means for reducing anthropogenic greenhouse gases(GHGs) emissions to the atmosphere, as deep saline aquifers can offer the greatest potential from a capacity point of view. Hence,research on core-scale CO2/brine multiphase migration processes is of great significance for precisely estimating storage efficiency, ensuring storage security, and predicting the long-term effects of the sequestered CO2in subsurface saline aquifers. This review article initially presents a brief description of the essential aspects of CO2subsurface transport and geological trapping mechanisms, and then outlines the state-of-the-art laboratory core flooding experimental apparatus that has been adopted for simulating CO2injection and migration processes in the literature over the past decade. Finally, a summary of the characteristics, components and applications of publicly reported core flooding equipment as well as major research gaps and areas in need of further study are given in relevance to laboratory-scale core flooding experiments in CO2geosequestration under reservoir conditions.

关键词： Carbon capture and storage(CCS) Geosequestration Trapping mechanism Core flooding Saline aquifer Experimental apparatus

Mercury indicating inflow zones and ruptures along the Wenchuan Ms 8.0 earthquake fault

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Chinese Journal Of Geochemistry 2015年第2期34卷 201-207页

作者： yang duoxing Zhang Lei Liu Yaowei Ren Hongwei Xie Furen Chen Gangcai Key Laboratory of Crustal Dynamics Institute of Crustal DynamicsCEA Institute of Geophysics CEA Chongqing Academy of Environmental Sciences

During the Wenchuan Fault Scientific Drilling Project,we determined the values of total mercury(HgT)and gaseous elemental mercury(GEM) from drilled cores and drilling mud,*** analysis shows HgT values ranging from 0.24 to 6.45 ng/g for the Penguan complex and from 2.90 to 137.54 ng/g for T3 *** average levels of HgT for the Penguan complex and T3 sediments are 1.81 ± 0.26 ng/g and23.96 ± 4.80 ng/g,*** anomalous peaks of HgT appear at depth of 614,731,993 and 1,107 m,which correspond to the long-term high seismic activity during crustal deformation in response to tectonic *** elemental mercury dissolved in drilling mud was also *** found fluid inflow zones with high GEM at depths of 590-750 m,suggesting that fluid-filled ruptures exist in the LMS fault *** indicates that mercury provides geochemical evidence for inflow zones and ruptures/fault zones in the Wenchuan Ms 8.0 earthquake fault.

关键词：地震断层断裂带汶川水星明流科学钻探工程地球化学分析钻井泥浆

基于光纤Bragg光栅的油气工业实时监测技术研究进展

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科技导报 2015年第13期33卷 84-91页

作者：孙艳坤李琦李霞颖杨多兴中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室武汉430071 中国地震局地壳应力研究所北京100085

光纤Bragg光栅(FBG)是近年发展起来的一种实时高精度监测技术,具有耐高温高压、抗电磁干扰、易于复用与可组网等独特优点,成为油气领域最具前景的监测手段。介绍了FBG传感技术的发展历程、工作原理,重点分析了全球油气工程中管道完整性... 详细信息

光纤Bragg光栅(FBG)是近年发展起来的一种实时高精度监测技术,具有耐高温高压、抗电磁干扰、易于复用与可组网等独特优点,成为油气领域最具前景的监测手段。介绍了FBG传感技术的发展历程、工作原理,重点分析了全球油气工程中管道完整性监测、油气测井、地震勘探方面的最新应用现状;探讨了目前FBG传感器在油气田复杂环境条件下实时监测存在的问题,并就未来发展趋势进行展望。

关键词：光纤Bragg光栅 FBG传感器油气工业监测技术

黄河郑州—济南段河型变化特征及其与隐伏断层活动的关系

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地质论评 2021年第6期67卷 1605-1618页

作者：王晶李德文马保起魏显虎魏永明杨多兴应急管理部国家自然灾害防治研究院北京100085 中国地震局地壳动力学重点实验室北京100085 中国科学院空天信息创新研究院北京100094

厚层松散堆积区(盆地或平原等)发震断层多以隐伏活动为主要特征,基于上断点的传统活动断层探测技术通常难以约束断层最新活动性质和时代。利用冲积河流对地表形变的敏感性评估断层活动性,是极具潜力的隐伏活动断层研究方向。本文基于TM/... 详细信息

厚层松散堆积区(盆地或平原等)发震断层多以隐伏活动为主要特征,基于上断点的传统活动断层探测技术通常难以约束断层最新活动性质和时代。利用冲积河流对地表形变的敏感性评估断层活动性,是极具潜力的隐伏活动断层研究方向。本文基于TM/ETM遥感影像,对小浪底水库建设前后(1990~2013年)郑州—济南段黄河水域多期次几何特征进行提取和分段,共获取6个时期河道中心线弯曲度和5个时段河道面积重叠率的沿程变化信息。与区域资料对比的结果表明,弯曲度异常高值段在空间分布上除个别临近运河穿越处外,主要与穿黄或临黄隐伏断层相对应,在综合分析各种潜在因素后,认为与相关隐伏断层活动引起的地表形变有关。多时段重叠率均值整体上顺流增大(趋于稳定),局部异常低值(不稳定)指示加积段落,在空间上与弯曲度分析指示的构造变形信息一致。本研究表明相关指标多期均值能较好地反映局部因素引起的河型异常,为认识和评价相关穿黄、临黄断层(新乡—商丘断裂、黄河断裂、聊城—兰考断裂、曹县断裂、巨野断裂及郑州—开封断裂)的活动性和地震危险性提供了独立的解释和评价依据,可为利用河型异常特征分析同类地区隐伏断层活动性和河段稳定性提供技术支撑。

关键词：活动构造隐伏断层河型异常地震危险性河流弯曲度

Numerical simulation of convective stability of the short-term storage of CO2 in saline aquifers

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Numerical simulation of convective stability of the short-te...

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： yang duoxing~(a,b,*),Zeng Rongshu~b,Zhang Deliang~c a Institute of Geology and Geophysics,CAS,Beijing 100029,China b Institute ofCrustal Dynamics,CEA,Beijing 100085,China c LHD Lab Institute of Mechanics,CAS,Beijing 100190,China

In this paper,inertial effects,mass interface and mass transfer mechanism are taken into *** applying an updated space and time conservation element and solution element(CE/SE) method and hybrid particle level-set method,the stability simulation of the density-driven convection in deep saline aquifers is presented for short-term storage of *** mass transfer equations coupled with two phase fluid flow equations are solved numerically to investigate effects of CO dissolution into brine on migration Results show that Taylor instability phenomenon has been observed in CO storage in saline aquifers for short time scales,which contributes to the further dissolution of COin saline ***-driven convection dominates hydrodynamic trapping,while dissolution process of CO also has a great influence on CO sequestration.

关键词： Multiphase flow CO2 storage CE/SE method Hybrid particle level set method

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致密储层岩石超低渗测试系统研发与应用进展

工程地质学报 2024年第4期32卷 1186-1198页

作者：王颂张路青周剑李晓潘哲君杨多兴李国梁中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室北京100029 中国科学院大学地球与行星科学学院北京100049 中国科学院地球科学研究院北京100029 北京工业大学城市与工程安全减灾教育部重点实验室北京100124 东北石油大学非常规油气研究院大庆163318 应急管理部国家自然灾害防治研究院北京100085

面向深部非常规能源开发领域,自主研制了一套适应于储层特性和深埋环境的超低渗测试系统,旨在解决高地温、高地压、高孔压条件下致密岩石超低渗透率精准测定的难题。该系统由渗流管路和高温高压多通道压力室两部分重要组件构成,经过创... 详细信息

面向深部非常规能源开发领域,自主研制了一套适应于储层特性和深埋环境的超低渗测试系统,旨在解决高地温、高地压、高孔压条件下致密岩石超低渗透率精准测定的难题。该系统由渗流管路和高温高压多通道压力室两部分重要组件构成,经过创新设计和系统优化,能稳定且可靠地模拟150℃高温、150 MPa围压和100 MPa孔压的深部储层环境,并能实现从亚纳达西至毫达西量级岩石样品渗透率的脉冲衰减法测量。基于该系统,开展了花岗岩和页岩在不同加卸载循环、有效应力、孔隙压力和温度条件下的渗透率测试。测试结果表明,加卸载循环次数增加有助于减少取样、制样过程中次生变形或次生微裂隙对测试结果的干扰;孔隙压力的提升抑制了气体滑脱效应,测得的表观渗透率更接近固有渗透率;相同有效应力条件下,页岩单一裂隙渗透率比基质渗透率至少高3个数量级;所建立的裂隙渗透率物理模型精准拟合了单一裂隙渗透率的测试结果,适用于刻画有效应力、孔隙压力和裂隙压缩变形共同影响下的裂隙页岩渗透率变化规律;固定有效应力和孔隙压力条件时,页岩渗透率随温度升高而降低。综上所述,所研发的超低渗测试系统可为致密储层渗透率的评价提供技术支撑,相关测试结果有助于加深对深部储层环境中流体运移机制的理解。

关键词：超低渗透率脉冲衰减法高温高压设备研发储层地质力学