Differential strain curve analysis to estimate the stress state of the Hijiori hot dry rock field, Japan

Oikawa, Yasuki; Matsunaga, Isao; Yamaguchi, Tsutomu

doi:10.1016/0148-9062(93)90065-l

Cited by 21 publications

(4 citation statements)

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“…Young 0 s modulus, Poisson 0 s ratio, shear modulus and bulk modulus). Differential strain curve analysis (DSCA and anelastic strain recovery (ASR) methods or ''overcoring'' can also be utilized to estimate the subsurface state of stress by means of oriented drill cores (Wolter 1997;Oikawa et al 2002).…”

Section: Study Of Reservoir Poro-elastic Propertiesmentioning

confidence: 99%

Application of the geomechanical facies approach and comparison of exploration and evaluation methods used at Soultz-sous-Forêts (France) and Spa Urach (Germany) geothermal sites

Tenzer¹,

Park

Kolditz

et al. 2010

Environ Earth Sci

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Earth-reservoirs are increasingly exploited today with the extraction of resources, such as heat and hydrocarbons, and the large-scale emplacement of waste, such as CO 2 sequestration. The characterization, site investigation, predictive modeling and long-term monitoring are dependent on the processes being investigated and modeled. In most cases complex coupled processes have to be addressed in a geologically complex rock mass system. In this paper we present a conceptual holistic framework known as geomechanical facies linking all the scales of investigation, characterization and reservoir development methods. We demonstrate this concept on the work undertaken during the design and development of the enhanced geothermal systems (EGS) systems at the forefront of European HotDry-Rock (HDR) technology, Soultz-sous-Forêts (France) and Spa Urach (Germany). Soultz-sous-Forêts is situated within granitic rocks and an active tectonic graben system in the central part of the Rhine Graben. It presents conditions of lithology, temperature, stress, hydraulics and geochemistry that are very different from those at Spa Urach, located in a very dense gneiss formation in the South German crystalline complex. Spa Urach exhibits more elastic behavior and is set tectonically within an almost inactive strike-slip stress field described in more detail in Sects. ''Drill core analysis'' and ''Hydraulic stimulation at Spa Urach''. This paper compares the exploration and field development methods used at these two sites against the back drop of the geomechanical facies concept. Issues addressed include the key parameters for flow and heat transport properties, coupled hydro-mechanical process identification, the success of the HDR reservoir as a heat exchanger and exploration techniques applicable to the different facies. Identification of the key geomechanical facies gives an indication as to which technologies will prove more efficient in the application of HDR technology. The results of this study will hopefully help in developing heat recovery schemes for the long-term economical operation of future HDR plants and EGS as well as assist in the understanding of engineered geosystems.

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Section: Study Of Reservoir Poro-elastic Propertiesmentioning

confidence: 99%

Application of the geomechanical facies approach and comparison of exploration and evaluation methods used at Soultz-sous-Forêts (France) and Spa Urach (Germany) geothermal sites

Tenzer¹,

Park

Kolditz

et al. 2010

Environ Earth Sci

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“…经过数十年的发展, 国内外的地应力测量方法可大致归纳为如下几类: 水力压裂法(hydraulic fracturing method) [3, 5~9] , 应力解除法(relief methods) [4~11] , 扁千斤顶法(flat jacking method) [5~7] , 应变恢复法(strain recovery method) [5,6] , 钻孔崩落法(borehole breakout method) [5,6] , 差应变应分析法(differential strain curve analysis method) [5,6,12] , 钻进诱发张裂缝法(drilling induced tensile fracture method) [13] , 声发射法(acoustic emission method) [14] , 以及地球物理方法等其他测试方法 [6] .…”

Section: 地应力测量方法概述unclassified

钻孔局部壁面应力解除法(bwsrm)的原理及其在锦屏二级水电站工程中的初步应用

侯¹,

葛²

2012

Sci. Sin.-Tech.

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“…A series of in situ stress measurement techniques have been developed to interpret stress in different geological conditions at a given point [1,2]. In situ stress measurement methods include the hydraulic fracturing method [2,[6][7][8][9], stress relief method [7][8][9][10], flat jacking method [9], borehole breakout method [9], drillinginduced tensile fracture method [11], acoustic emission method [12], strain recovery method [9], differential strain curve analysis method [9,13], and geophysical method [9]. Among them, the hydraulic fracturing method and the stress relief method with overcoring are usually employed for in situ stress measurement in projects with boreholes [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…As China's western development strategy is further implemented, the number of deep and large road and railway tunnel projects will increase in the future. Unlike shallow engineering projects, deeply buried tunnel projects feature high sidewalls, large spans, high in situ stresses, and complex geological conditions [12][13][14][15][16]. e deformation or damage of the rocks surrounding deeply buried tunnels is distinctly influenced by the in situ stress field.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the In Situ Stress Field and Engineering Effect along the Lijiang to Shangri‐La Railway on the Southeastern Tibetan Plateau, China

Chai

Ling

et al. 2021

Advances in Civil Engineering

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This work aims to characterize the in situ stress field along the Lijiang to Shangri-La railway and identify possible engineering geological problems when constructing tunnels along this railway on the margin of the Tibetan Plateau. The in situ stress measured at 76 points in 12 boreholes by the hydraulic fracturing method was analysed. A rose diagram of the maximum principal stress direction was plotted based on the measured in situ stress data. The results show that the measured in situ stress is mainly horizontal stress, corresponding to a strike-slip fault-related tectonic stress field with a moderate to high in situ stress value. The main stress values have a good linear relationship with the burial depth, and the maximum horizontal principal stress (σH) increases by 1.1–8.8 MPa per 100 m, with an average gradient value of 3.6 MPa per 100 m. The maximum and minimum horizontal principal stresses and the stress differences increase with depth, and the lateral pressure coefficient (σH/ σ v ) is generally 1–1.5. The ratio of the maximum and minimum effective stresses is less than the threshold at which faulting occurs, resulting in faults that are relatively stable at present. The direction of the maximum horizontal principal stress is oriented at a small angle to the axial direction of the deeply buried tunnel along the railway line; therefore, the tunnel sidewalls could readily deform during the construction process. Rock bursts are expected to occur in strong rock masses with high risk grades, whereas slight to moderate deformation of the rock surrounding the tunnel is expected to occur in weak rock masses. This study has significance for understanding the regional fault activity and issues related to the construction of deeply buried tunnels along the Lijiang to Shangri-La railway.

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Differential strain curve analysis to estimate the stress state of the Hijiori hot dry rock field, Japan

Cited by 21 publications

References 1 publication

Application of the geomechanical facies approach and comparison of exploration and evaluation methods used at Soultz-sous-Forêts (France) and Spa Urach (Germany) geothermal sites

Application of the geomechanical facies approach and comparison of exploration and evaluation methods used at Soultz-sous-Forêts (France) and Spa Urach (Germany) geothermal sites

钻孔局部壁面应力解除法(bwsrm)的原理及其在锦屏二级水电站工程中的初步应用

Characteristics of the In Situ Stress Field and Engineering Effect along the Lijiang to Shangri‐La Railway on the Southeastern Tibetan Plateau, China

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