Source Mechanisms Inversion of Induced “Seismicity” During Laboratory Hydraulic Fracturing
Description:
This paper presents a laboratory study focused on hydraulic fracturing within a shale specimen. During the study, in-situ acoustic emissions were monitored using a 24-sensor array, with four sensors placed on each of the sample block's surfaces. The large shale specimen featured a pre-existing natural fracture spanning the entire sample. To replicate authentic subsurface stress conditions, a true tri-axial compression system applied confining stress. Fluid was introduced through a central borehole within the specimen until a hydraulic fracture developed along a pre-cut notch situated at the borehole's edge. This newly formed hydraulic fracture was oriented perpendicular to the pre-existing natural fracture.
We employ a quantitative analysis approach to study hydrofracturing processes, focusing on the localization and source mechanism inversion of induced labquakes recorded by the 24-sensor array. Utilizing waveform-based inversion techniques, our study reveals key insights into the hydraulic fracture growth and the activation of natural fractures that trigger these recorded labquakes. This research offers a comprehensive understanding of the dynamics involved in hydraulic fracturing processes.
Session: Induced Earthquakes: Source Characteristics, Mechanisms, Stress Field Modeling and Hazards [Poster Session]
Type: Poster
Date: 5/1/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Zhi
Student Presenter: Yes
Invited Presentation:
Authors
Zhi Yuan Presenting Author Corresponding Author yuan-z20@mails.tsinghua.edu.cn Tsinghua University |
Chen Gu guchch@mit.edu Tsinghua University |
Yichen Zhong zhongyc22@mails.tsinghua.edu.cn Tsinghua University |
Peng Wu wup23@mails.tsinghua.edu.cn Tsinghua University |
Zhuoyu Chen zhuoyu-c21@mails.tsinghua.edu.cn Tsinghua University |
Borui Kang kbr19thu@gmail.com Tsinghua University |
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Source Mechanisms Inversion of Induced “Seismicity” During Laboratory Hydraulic Fracturing
Session
Induced Earthquakes: Source Characteristics, Mechanisms, Stress Field Modeling and Hazards