Moment Tensor Analysis of Acoustic Emissions Induced by Laboratory-based Hydraulic Fracturing in Granite,

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書誌事項

公開日
2019-03
資源種別
journal article
権利情報
  • This article has been accepted for publication in ’Geophysical Journal International' © The Author(s) 2019. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
DOI
  • 10.1093/gji/ggy493
公開者
Oxford University Press (OUP)

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説明

Moment Tensors of hydraulically induced AEs: Hydraulic fracturing is an important technique in the development of enhanced geothermal systems and unconventional resources. Although the fracture modes induced by hydraulic fracturing influence the recovery efficiency of the resources, the current understanding of this relationship is insufficient. In this study, we considered the acoustic emissions (AEs) induced during hydraulic fracturing under uniaxial loading conditions in the laboratory, and applied a moment tensor analysis by carefully correcting the coupling condition and directivity of AE transducers. Experiments were conducted for two types of Kurokami–jima granite samples: those with a rift plane perpendicular (Type H) or parallel (Type V) to the expected direction of fracture propagation (i.e. along the loading axis). In the experiments, both sample types experienced a significant number of shear, tensile and compressive events. The dominant fracture mode for Type H samples is found to be tensile events in which the fracture plane is parallel to the loading axis, whereas for Type V samples, shear events are dominant. This difference suggests that the dominant fracture modes induced by hydraulic fracturing are highly dependent on the relationship between the direction of fracture propagation and orientation of pre-existing weak planes.

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