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Replacement of annular domain with trapezoidal domain in computational modeling of nonaqueous-phase-liquid dissolution-front propagation problems

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Journal of Central South University 2015年第5期22卷 1841-1846页

作者：赵崇斌 Thomas POULET klaus regenauer-lieb Computational Geosciences Research Centre Central South University CSIRO Division of Earth Science and Resource Engineering P.O.Box 1130 Bentley WA 6102 Australia School of Earth and Environment The University of Western Australia

In order to simulate the instability phenomenon of a nonaqueous phase liquid(NAPL) dissolution front in a computational model, the intrinsic characteristic length is commonly used to determine the length scale at which the instability of the NAPL dissolution front can be initiated. This will require a huge number of finite elements if a whole NAPL dissolution system is simulated in the computational model. Even though modern supercomputers might be used to tackle this kind of NAPL dissolution problem, it can become prohibitive for commonly-used personal computers to do so. The main purpose of this work is to investigate whether or not the whole NAPL dissolution system of an annular domain can be replaced by a trapezoidal domain, so as to greatly reduce the requirements for computer efforts. The related simulation results have demonstrated that when the NAPL dissolution system under consideration is in a subcritical state, if the dissolution pattern around the entrance of an annulus domain is of interest, then a trapezoidal domain cannot be used to replace an annular domain in the computational simulation of the NAPL dissolution ***, if the dissolution pattern away from the vicinity of the entrance of an annulus domain is of interest, then a trapezoidal domain can be used to replace an annular domain in the computational simulation of the NAPL dissolution system. When the NAPL dissolution system under consideration is in a supercritical state, a trapezoidal domain cannot be used to replace an annular domain in the computational simulation of the NAPL dissolution system.

关键词： nonaqueous phase liquid(NAPL) trapezoidal domain computational simulation dissolution front instability

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Rock Plasticity from Microtomography and Upscaling

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Journal of Earth Science 2015年第1期26卷 53-59页

作者： Jie Liu Reem Freij-Ayoub klaus regenauer-lieb School of Earth Science and Geological Engineering Sun Yat-Sen University School of Earth and Environment the University of Western AustraliaPerth WA 6000Australia Earth Science and Resource Engineering CSIROKensington WA 6151Australia School of Petroleum Engineering University of New South WalesSydney NSW 2052Australia

We present a workflow for upscaling of rock properties using microtomography and percolation theory. In this paper we focus on a pilot study for assessing the plastic strength of rocks from a digital rock image. Firstly, we determine the size of mechanical representative volume ele- ment （RVE） by using upper/lower bound dissipation computations in accordance with thermody- namics. Then the mechanical RVE is used to simulate the rock failure at micro-scale using FEM. Two cases of different pressures of linear Drucker-Prager plasticity of rocks are computed to compute the macroscopic cohesion and the angle of internal friction of the rock. We also detect the critical exponents of yield stress for sealing laws from a series of derivative models that are created by a shrinking/expanding algorithm. We use microtomographic data sets of two carbonate samples and compare the results with previous results. The results show that natural rock samples with irregular structures may have the critical exponent of yield stress different from random models. This unexpected result could have significant ramifications for assessing the stability of solid materials with internal structure. Therefore our pilot study needs to be extended to investigate the scaling laws of strength of many more natural rocks with irregular microstructure.

关键词： plastic strength rock mierotomography percolation theory upscaling.

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Borehole deformation based in situ stress estimation using televiewer data

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2475-2481页

作者： Hamid Roshan Danqi Li Ismet Canbulat klaus regenauer-lieb School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW2052Australia WA School of Mines MineralsEnergy and Chemical EngineeringCurtin UniversityPerthWA6102Australia

The knowledge of in situ stress is critical in safe and optimised extraction of minerals and energy *** situ stresses are either measured directly(***)or estimated indirectly(*** breakouts).Borehole breakout analysis for in situ stress estimation is considered a relatively simple and cost-efficient *** technique,however,poses certain limitations such as complexities with progressive formation of breakouts and it requires inputs such as rock failure parameters that are not often *** a result,significant effort has been made to develop new indirect methods for in situ stress *** deformation analysis using four-arm caliper has been recently proposed for in situ stress estimation and has shown promising *** this study,we demonstrate a new methodology that analyses the borehole televiewer data with the technique of borehole deformation analysis to estimate the in situ stresses through a field case *** advantages and challenges of using borehole televiewer data for stress estimation based on borehole deformation analysis are discussed and the best practice to obtain the reliable results is *** limitations of using fourarm caliper and borehole deformation analysis for in situ stress estimation are also discussed and it is shown how televiewer data can overcome such ***,the in situ stress results obtained from televiewer data and borehole deformation analysis are compared with independent in situ stress measurements to show the robustness and reliability of the proposed methodology.

关键词： In situ stress Borehole deformation Televiewer Elastic properties Downhole logging

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Coupling of Thermal-Hydraulic-Mechanical Processes for Geothermal Reservoir Modelling

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Journal of Earth Science 2015年第1期26卷 47-52页

作者： Ali Karrechl Oussama Beltaief Ruyan Vincec Thomas Poulet klaus regenauer-lieb School of Civil and Resource Engineering The University of Western AustraliaCrawley WA 6009Australia Tunisia Polytechnic School Rue AlkhawarizmiLa MarsaTunisia Earth Science and Resource Engineering CSIROKensington WA 6151Australia School of Petroleum Engineering University of New South WalesSydney NSW 2052Australia School of Earth and Environment The University of Western AustraliaPerth WA 6000Australia

This paper uses a fully coupled framework of thermal-hydraulic-mechanical processes to investigate how the injection and extraction of fluid within a geothermal reservoir impacts on the distributions of temperature, pore pressure, and deformation within the rock formations. Based on this formulation, a numerical model is developed in light of the thermodynamics of porous materials. The proposed procedure relies on the derivation of dissipative flow rules by postulating proper storage and dissipation functions. This approach opens new horizons for several resource engineering applications. Since it allows for full coupling, this formulation can play a key role in predicting risks when used for reservoir simulation. The results indicate that the injection-extraction process and temperature change have a definite impact on altering the in-situ properties of the reservoir.

关键词： poro-mechanics resource engineering fluid injection and extraction temperaturechange pore pressure stress deformation uplift subsidence.

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Foreword: Toward a Quantitative Understanding of the Frontier in Geothermal Energy

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Journal of Earth Science 2015年第1期26卷 1-1页

作者： klaus regenauer-lieb David A.Yuen Shihua Qi Yanxin Wang Chisheng Liang School of Petroleum Engineering University of New South WalesSydney NSW 2052Australia Earth Science and Resource Engineering CSIROKensington WA 6151Australia School of Earth and Environment The University of Western AustraliaPerth WA 6000Australia School of Environmental Studies China University of Geosciences Department of Earth Sciences and Minnesota Supercomputing Institute University of MinnesotaMinneapolis MN 55455USA Guangdong Geological Bureau

Our planet, Earth, contains an enormous amount of heat just right under our feet. Harnessing this heat from 2 to 5 krn below is one of the great challenges of the 21st century, because this can solve many of the currently urgent problems in mega-cities, such as inexpensive domestic heating and airconditioning, electric power consumption and the cure of ram- pant air pollution. Around 40 TW heat are released at a steady rate by the Earth partly due to natural radioactive decay and partly due to the action inside the core. We would like to stress here that the depth of the isotherm of 200℃ （minimum tem- perature for efficient generation of electricity） varies around the globe. In general, this depth would be less than 10 km deep. Therefore these heat sources would provide ubiquitous ample, clean and sustainable electricity. In addition to this sustainable resource the potential of geothermal energy use is much greater, because it allows effective heat mining of the Earth. Geothermal energy is most commonly exploited in volcanic areas where magma is close to the surface and brings up the heat from deeper down. The largest geothermal power plant of this style is the Geysers in California, which with 1 GW power production rivals nuclear power plants.

关键词： Toward a Quantitative Understanding of the Frontier in Geothermal Energy Foreword

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Deep Geothermal: The ‘Moon Landing' Mission in the Unconventional Energy and Minerals Space

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Journal of Earth Science 2015年第1期26卷 2-10页

作者： klaus regenauer-lieb Andrew Bunger Hui Tong Chua Arcady Dyskin Florian Fusseis Oliver Gaede Rob Jeffrey Ali Karrech Thomas Kohl Jie Liu Vladimir Lyakhovsky Elena Pasternak Robert Podgorney Thomas Poulet Sheik Rahman Christoph Schrank Mike Trefry Manolis Veveakis Bisheng Wu David A.Yuen Florian Wellmann Xi Zhang School of Petroleum Engineering University of New South WalesSydney NSW 2052Australia Earth Science and Resource Engineering CSIROKensington WA 6151Australia School of Earth and Environment The University of Western AustraliaPerth WA 6000Australia Department of Civil and Environmental Engineering & Department of Chemical and Petroleum Engineering University of PittsburghPittsburghPennsylvaniaUSA School of Geosciences University of EdinburghEdinburghUK Science and Engineering Faculty School of EarthEnvironmental and Biological SciencesEarth SystemsQueensland University of TechnologyBrisbaneAustralia Karlsruhe Institute of Technology KarlsruheGerman School of Earth Science and Geological Engineering Sun Yat-Sen University Geological Survey of Israel Jerusalem 95501Israel Idaho National Laboratory Idaho FallsUSA Land and Water CSIROFloreat Park WA 6014Australia School of Environmental Studies China University of Geosciences Department of Earth Sciences and Minnesota Supercomputing Institute University of MinnesotaMinneapolis MN 55455USA Aachen Institute for Advanced Study in Computational Engineering Science (AICES) RWTH Aachen University52062 AachenGermany

Deep geothermal from the hot crystalline basement has remained an unsolved frontier for the geothermal industry for the past 30 years. This poses the challenge for developing a new unconventional geomechanics approach to stimulate such reservoirs. While a number of new unconventional brittle techniques are still available to improve stimulation on short time scales, the astonishing richness of failure modes of longer time scales in hot rocks has so far been overlooked. These failure modes represent a series of microscopic processes： brittle microfracturing prevails at low temperatures and fairly high deviatoric stresses, while upon increasing temperature and decreasing applied stress or longer time scales, the failure modes switch to transgranular and intergranular creep fractures. Accordingly, fluids play an active role and create their own pathways through facilitating shear localization by a process of time-dependent dissolution and precipitation creep, rather than being a passive constituent by simply following brittle fractures that are generated inside a shear zone caused by other localization mechanisms. We lay out a new theoretical approach for the design of new strategies to utilize, enhance and maintain the natural permeability in the deeper and hotter domain of geothermal reservoirs. The advantage of the approach is that, rather than engineering an entirely new EGS reservoir, we acknowledge a suite of creep-assisted geological processes that are driven by the current tectonic stress field. Such processes are particularly supported by higher temperatures potentially allowing in the future to target commercially viable combinations of temperatures and flow rates.

关键词： geothermal energy enhanced geothermal systems fracture mechanics creep dissolution precipitation.

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广东河源断裂带地热成因及与构造关系初探

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地质力学学报 2019年第3期25卷 400-411页

作者： Lisa TANNOCK 王亚李景富刘洁张珂徐力峰 klaus regenauer-lieb 澳大利亚新南威尔士大学矿产与能源资源工程学院澳大利亚悉尼2052 中山大学地球科学与工程学院广东广州510275 广东省地质过程与矿产资源探查重点实验室广东广州510275 广东省有色地质环境中心广东广州510080

广东省河源断裂带位于中国东南沿海地热异常区,地热资源十分丰富,但其形成机制和利用前景尚不确定。为此文章开展了多学科综合分析,获得以下初步认识:温泉是断裂带内深循环地下水被地温加热而成,断裂剪切热和花岗岩浆残余热的贡献基本... 详细信息

广东省河源断裂带位于中国东南沿海地热异常区,地热资源十分丰富,但其形成机制和利用前景尚不确定。为此文章开展了多学科综合分析,获得以下初步认识:温泉是断裂带内深循环地下水被地温加热而成,断裂剪切热和花岗岩浆残余热的贡献基本可以排除;沿断裂展布的厚层硅化带是古水热活动的产物;硅化带形成时期的挤压应力方向为北东-南西,与河源断裂及河源盆地晚白垩世以来的伸展活动对应,现代构造应力场为北西西-南东东方向挤压,与古应力场相比发生了明显变化;现今构造应力场使得北东向河源断裂呈右旋挤压运动,而北西向断裂则发生左旋张剪,导致地下水循环格局也发生相应改变;目前温泉沿河源断裂呈带分布,沿北西向断裂呈线性溢出,断裂交汇部位是热泉上升的主要通道。总体而言,河源地区拥有令人鼓舞的地热资源及应用前景,有可能达到建设地热发电厂的目标。建议继续深入开展地质学、地球物理、水文地质学和地热成因机理等多学科综合研究,从而更好地定量评价地热潜能与开发前景。

关键词：河源断裂地热硅化带构造应力场地下水循环

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关于构造地质模型的不确定性及信息价值的认识

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海洋地质 2013年第1期29卷 2-3页

作者： J. Florian WELLMANN klaus regenauer-lieb

构造地质模型总有不确定性。这里提出一种使用信息熵来解决其不确定性的方法。用概率理论计算模型空间每个位置的预测标量值，进而计算一个平均信息熵值来度量不确定性模型体。我们利用这种方法评估不确定性是由于地质界面的接触位置和... 详细信息

构造地质模型总有不确定性。这里提出一种使用信息熵来解决其不确定性的方法。用概率理论计算模型空间每个位置的预测标量值，进而计算一个平均信息熵值来度量不确定性模型体。我们利用这种方法评估不确定性是由于地质界面的接触位置和走向不明。

关键词：不确定性信息价值地质模型构造接触位置模型空间概率理论地质界面

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Modelling of Short-Timescale Lithospheric Geodynamics from weeks onwards

Modelling of Short-Timescale Lithospheric Geodynamics from w...

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2014年中国地球科学联合学术年会——国际专题（2）Microseismic Monitoring and Inversion

作者： David A.Yuen Yuri Podladchikov Gabriele Cambiotti Roberto Sabadini Manolis Veveakis klaus regenauer lieb B.Xiujiao Wang Dept. of Earth Sciences University of Minnesota School of Environmental Studies Chinese University of Geosciences Dept. of Earth and Environmental Sciences University of Lausanne Dept. of Earth Sciences University of Milan School of Engineering University of New South Wales Institute of Geology and Geophysics Chinese Academy of Sciences

Knowledge concerning geodynamical phenomena over a short-timescale has grown tremendously in the past 25 years because of the introduction of geodetic measurements driven by GPS and InSAR technology and satellite observations,*** and Topex *** acquisition of these data have forced geodynamicists to develop more refined mathematical models to explain the phenomena of episodic earthquake tremors(ETS)the temporal variations of the Earth’s topography and geoid fields,and the short-term scale movements of the Earth’s rotational axis(TPW or true polar wander),excited by the extremely large earthquakes,greater than Mw=8.5,which occurred in the past 20 *** have increased tremendously our understanding of geodynamical forces for short and intermediate short-timescales.

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微观层析成像技术在地球科学中的应用——几何结构特征、岩石物性模拟及尺度升级

微观层析成像技术在地球科学中的应用——几何结构特征、岩石物性...

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2014年中国地球科学联合学术年会——专题20：岩石物...

作者：刘洁 klaus regenauer-lieb Reem Freij-Ayoub University of Western Australia 中山大学地球科学与地质工程学院 CSIRO Earth Science and Resource Engineering University of New South Wales

＜正＞利用岩石微观层析成像,我们分析微观结构的几何学特征,模拟计算微观尺度上材料物性参数,并提取尺度率参数从而分析材料物性的尺度升级问题。微观结构的几何特征由体积百分比、比表面积、连通性（逾滲）,与及结构的各向异性表征[1]...

＜正＞利用岩石微观层析成像,我们分析微观结构的几何学特征,模拟计算微观尺度上材料物性参数,并提取尺度率参数从而分析材料物性的尺度升级问题。微观结构的几何特征由体积百分比、比表面积、连通性（逾滲）,与及结构的各向异性表征[1],自主开发的程序可以快速处理超大规模数据以获取这些特征参数。岩石物性参数（滲透率和力学参数）通过基于代表性体元（RVE）的数值模拟获得,包括孔隙尺度流体动力学模拟和微观结构固体力学相应分

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