Influence of organic content on acoustic wavepropagation characteristic of organic-rich shale

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  • State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,
    Southwest Petroleum University,Chengdu 610050,China

Received date: 2017-02-26

  Revised date: 2017-07-07

  Online published: 2017-09-10

Abstract

As the significant component of the gas-bearing shale,the content and type of organic control the porosity and hydrocarbon to a large degree.In the predecessors’ work had been paid on the shale’s velocity and mechanical properties anisotropy,caused by shale’s mineal composition and arrangement anisotropy,while the research on the relationship of organic content and wave propagation characteristic of organic-rich shale was rare.The Chang 7 member of Triassic Yanchang Formation organic-rich shale in Ordos Basin is the object of our research.The information of ultrasonic wave under 15MPa confining pressure was acquired,with the assistant of the SCMS-J equipment developed in-house.The influence of organic matter content on wave propagation speed and mechanical properties of shale was analyzed.Rules of wave form and wave spectrum were researched using fast fourier transform.The following conclusions can be drawn: Firstly,Both compressional and shear wave velocities decrease as organic content increases.The impact of organic content on shear velocity was found to be more significant compared with the response with compressional velocity.Secondly,Both dynamic shear modulus (G),dynamic bulk modulus (K),dynamic Young’s modulus(E) decrease as organic content increases.Poisson’s ratio (v) increases as organic content increases.The more organic content the shale “softer”.Lastly,the higher organic matter content,the high frequency absorption is more obvious,the dominant frequency move to low frequency.Centroid frequency is negatively correlated with organic content.The results of this study have some guiding significance for the prediction of organic matter content by acoustic wave information.
 

Cite this article

Kang Yi-li,Bai Jia-jia,You Li-jun . Influence of organic content on acoustic wavepropagation characteristic of organic-rich shale[J]. Natural Gas Geoscience, 2017 , 28(9) : 1341 -1349 . DOI: 10.11764/j.issn.1672-1926.2017.07.001

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