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Linking static and dynamic mechanical properties for metamorphic rocks from Austria including their anisotropic effect
Acta Geophysica ( IF 2.0 ) Pub Date : 2021-03-20 , DOI: 10.1007/s11600-021-00566-w
Nina Gegenhuber , Melanie Krueger

The derivation of geomechanical properties from petrophysical/geophysical data is not only of great importance in the oil industry but also in mining, geothermal projects and tunnelling, for reduction of costs and to improve security. For the oil industry and geothermal sector, it is mainly important for drilling rate and the stability of the borehole and, as a result, the economic factor. A key issue is that geomechanical properties, which can support a better planning of a project, cannot be measured in the borehole or on the surface directly. In this study, the focus is put on anisotropic effects on the correlation between static and dynamic properties, which is neglected in most studies but important because values can vary extremely. Therefore, measurements in the geotechnical laboratory of compressional and shear wave velocity during uniaxial compression strength test were taken. Additionally, typical properties like bulk and grain density as well as porosity were determined too. Different samples (carbonate–silica schist, marble and phyllite) from the "Zentrum am Berg"-research tunnelling centre at the "Erzberg" in Austria were used. Shown are correlations between uniaxial compression strength and compressional wave velocity as well as for static and dynamic Young’s modulus including their anisotropic effect. The results are promising and provide an opportunity for further applications on log data.



中文翻译:

链接奥地利变质岩的静态和动态力学特性,包括各向异性效应

从岩石物理/地球物理数据推导地质力学特性不仅在石油工业中非常重要,而且在采矿,地热工程和隧道技术中也很重要,以降低成本并提高安全性。对于石油工业和地热部门而言,它对于钻速和井眼稳定性以及因此的经济因素而言非常重要。一个关键问题是,不能直接在钻孔中或在地面上测量可以支持更好地规划项目的地质力学特性。在这项研究中,重点放在各向异性对静态和动态特性之间的相关性的影响上,这在大多数研究中都被忽略,但是很重要,因为值可能会发生很大变化。所以,在岩土工程实验室中进行了单轴抗压强度测试期间的压缩波和剪切波速度测量。另外,还确定了诸如堆积和晶粒密度以及孔隙率的典型性质。使用了来自奥地利“ Erzberg”研究隧道中心“ Zentrum am Berg”的不同样品(碳酸盐-二氧化硅片岩,大理石和橄榄石)。显示了单轴抗压强度和压缩波速度之间的相关性,以及静态和动态杨氏模量(包括它们的各向异性效应)之间的相关性。结果令人鼓舞,并为进一步应用日志数据提供了机会。使用了来自奥地利“ Erzberg”研究隧道中心“ Zentrum am Berg”的不同样品(碳酸盐-二氧化硅片岩,大理石和橄榄石)。显示了单轴抗压强度和压缩波速度之间的相关性,以及静态和动态杨氏模量(包括它们的各向异性效应)之间的相关性。结果令人鼓舞,并为进一步应用日志数据提供了机会。使用了来自奥地利“ Erzberg”研究隧道中心“ Zentrum am Berg”的不同样品(碳酸盐-二氧化硅片岩,大理石和橄榄石)。显示了单轴抗压强度和压缩波速度之间的相关性,以及静态和动态杨氏模量(包括它们的各向异性效应)之间的相关性。结果令人鼓舞,并为进一步应用日志数据提供了机会。

更新日期:2021-03-21
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