Static and Dynamic Moduli of Malm Carbonate: A Poroelastic Correlation

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• 作者：Alireza Hassanzadegan ; Romain Guérizec ; Thomas Reinsch…
• 关键词：Biot theory of poroelasticity ; Acoustic wave propagation ; Static elastic moduli ; Dynamic elastic moduli ; Seismo ; mechanics
• 刊名：Pure and Applied Geophysics
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：173
• 期：8
• 页码：2841-2855
• 全文大小：1,132 KB
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• 作者单位：Alireza Hassanzadegan (1)
  Romain Guérizec (1) (2)
  Thomas Reinsch (1)
  Guido Blöcher (1)
  Günter Zimmermann (1)
  Harald Milsch (1)
  
  1. Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany
  2. University of Montpellier, Montpellier, France
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9136
• 卷排序：173

文摘

The static and poroelastic moduli of a porous rock, e.g., the drained bulk modulus, can be derived from stress–strain curves in rock mechanical tests, and the dynamic moduli, e.g., dynamic Poisson’s ratio, can be determined by acoustic velocity and bulk density measurements. As static and dynamic elastic moduli are different, a correlation is often required to populate geomechanical models. A novel poroelastic approach is introduced to correlate static and dynamic bulk moduli of outcrop analogues samples, representative of Upper-Malm reservoir rock in the Molasse basin, southwestern Germany. Drained and unjacketed poroelastic experiments were performed at two different temperature levels (30 and 60 \(^\circ\)C). For correlating the static and dynamic elastic moduli, a drained acoustic velocity ratio is introduced, corresponding to the drained Poisson’s ratio in poroelasticity. The strength of poroelastic coupling, i.e., the product of Biot and Skempton coefficients here, was the key parameter. The value of this parameter decreased with increasing effective pressure by about 56 \(~\%\) from 0.51 at 3 MPa to 0.22 at 73 MPa. In contrast, the maximum change in P- and S-wave velocities was only 3 % in this pressure range. This correlation approach can be used in characterizing underground reservoirs, and can be employed to relate seismicity and geomechanics (seismo-mechanics). Keywords Biot theory of poroelasticity Acoustic wave propagation Static elastic moduli Dynamic elastic moduli Seismo-mechanics