Mechanical behaviors of an anisotropic shale rock

Q. Gao, J. L. Tao, J. Y. Hu, X. Yu

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

Abstract

Shale gas is becoming an increasingly important energy source worldwide. The geomechanical properties of shale rocks can have a major impact on the efficiency of shale gas exploration. This paper studies the mineralogical and mechanical characteristics of a typical gas shale in Ohio, USA. A scanning electron microscope (SEM) with Energy Dispersive X-ray (EDX) analyses was employed to measure the microstructure and material composition of the shale rock. The anisotropic behaviors of shale rock, including compressive and tensile strength, were experimentally measured. The effects of anisotropy on the observed strength behaviors and failure patterns were discussed. The characteristics of shale rock are also studied by non-destructive wave speed measurements. The shale demonstrated strong anisotropic behaviors with the tensile strength perpendicular to the bedding plane around 300-360 times of that parallel to the bedding plane. Results of ultrasonic testing indicated that both compression and shear wave velocities show strong anisotropic patterns. The compression wave speed was smallest in the direction perpendicular to the bedding plane, while the shear wave speed was smallest in the direction parallel to the bedding plane. The ratio of wave speed anisotropy is around 1.3-1.4 times for compression wave. The ratio of wave speed anisotropy is more diverse for shear wave.

Original languageEnglish (US)
Title of host publicationShale Energy Engineering 2014
Subtitle of host publicationTechnical Challenges, Environmental Issues, and Public Policy - Proceedings of the 2014 Shale Energy Engineering Conference
PublisherAmerican Society of Civil Engineers (ASCE)
Pages159-167
Number of pages9
ISBN (Print)9780784413654
DOIs
StatePublished - Jan 1 2014
Externally publishedYes
EventShale Energy Engineering 2014: Technical Challenges, Environmental Issues, and Public Policy - Pittsburgh, PA, United States
Duration: Jul 21 2014Jul 23 2014

Publication series

NameShale Energy Engineering 2014: Technical Challenges, Environmental Issues, and Public Policy - Proceedings of the 2014 Shale Energy Engineering Conference

Conference

ConferenceShale Energy Engineering 2014: Technical Challenges, Environmental Issues, and Public Policy
CountryUnited States
CityPittsburgh, PA
Period7/21/147/23/14

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology

Fingerprint Dive into the research topics of 'Mechanical behaviors of an anisotropic shale rock'. Together they form a unique fingerprint.

  • Cite this

    Gao, Q., Tao, J. L., Hu, J. Y., & Yu, X. (2014). Mechanical behaviors of an anisotropic shale rock. In Shale Energy Engineering 2014: Technical Challenges, Environmental Issues, and Public Policy - Proceedings of the 2014 Shale Energy Engineering Conference (pp. 159-167). (Shale Energy Engineering 2014: Technical Challenges, Environmental Issues, and Public Policy - Proceedings of the 2014 Shale Energy Engineering Conference). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784413654.017