Acoustic emission characteristics of shale

Z. Moradian, Q. B. Li, S. Morgan, B. Gonçalves Da Silva, J. T. Germaine, H. H. Einstein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Shale gas and oil production has grown rapidly in recent years, and consequently there are increasing demands to understand the mechanical and microseismic properties of shale. Acoustic emission (AE) monitoring provides useful information on the fracture mechanisms of shale rocks, and provides a basis for interpreting field seismic observations. While there have been attempts for microseismic monitoring of conventional hydrocarbon reservoirs, shale presents a large number of issues that require further investigation. For this purpose, experiments were conducted to understand the characteristics of the AE waveforms propagated through Opalinus shale rock in the time and frequency domains. Frequency range, arrival time, first arrival amplitude and other parameters such as counts, duration and energy of the waves generated from artificial and natural sources in the shale specimens were detected and compared with AE characteristics of granite, a brittle rock that has been extensively investigated. The experimental tests showed that there are some important factors that influence the analyses and interpretations of seismic surveys and microseismic monitoring of shale compared to granite. One of these factors is the anisotropic behavior of shale that causes the wave to propagate with different velocities in different directions. Also bedding planes and micro-discontinuities in the shale cause attenuation of the waves. Thus the AE waveforms that arrive at the sensor are a distorted and attenuated versions of the source waveform.

Original languageEnglish (US)
Title of host publication13th ISRM International Congress of Rock Mechanics
Editors Hassani, Hadjigeorgiou, Archibald
PublisherInternational Society for Rock Mechanics
ISBN (Electronic)9781926872254
StatePublished - Jan 1 2015
Externally publishedYes
Event13th ISRM International Congress of Rock Mechanics 2015 - Montreal, Canada
Duration: May 10 2015May 13 2015

Publication series

Name13th ISRM International Congress of Rock Mechanics
Volume2015- MAY

Other

Other13th ISRM International Congress of Rock Mechanics 2015
CountryCanada
CityMontreal
Period5/10/155/13/15

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Keywords

  • Acoustic emission
  • Anisotropy
  • Attenuation
  • Frequency domain
  • Shale
  • Source Location
  • Time domain
  • Waveform

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