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

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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岩石圈动力学三重破坏模型与初步应用

岩石圈动力学三重破坏模型与初步应用

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2014年中国地球科学联合学术年会——专题40：青藏高原周缘的构造变形与深部动力学过程

作者：刘洁 Klaus Regeanuer-Lieb Ali Karrech Gideon Rosenbaum vladimir lyakhovsky 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 University of Queensland

基于非平衡热动力学原理,我们给出了一个综合力学破坏与局部熔融破坏的全新"三重破坏"模型:对于力学破坏,我们考虑了基于非平衡热动力学的弹黏塑性破坏;对于局部熔融,我们采用了平衡的热动力学模型(借助基于Gibbs能最小化原理的MELTS软...

基于非平衡热动力学原理,我们给出了一个综合力学破坏与局部熔融破坏的全新"三重破坏"模型:对于力学破坏,我们考虑了基于非平衡热动力学的弹黏塑性破坏;对于局部熔融,我们采用了平衡的热动力学模型(借助基于Gibbs能最小化原理的MELTS软件包[1-3])。该模型在统一的热动力学框架下,实现了对岩石圈浅部脆性破坏、中深部韧性破坏和深部局部熔融破坏的综合描述,因而被称为三重破坏模

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