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Effect of Pressure on Compression, Shear and Young’s ModuliNormal access

Authors: A. Kiss, J. Somogyi Molnar, M. Dobroka, T. Ormos and Á. Gyulai
Event name: 8th Congress of the Balkan Geophysical Society
Session: Modeling & Inversion II
Publication date: 05 October 2015
DOI: 10.3997/2214-4609.201414207
Organisations: BGS, EAGE
Language: English
Info: Extended abstract, PDF ( 2.41Mb )
Price: € 20

Summary:
s covered the examination of pressure dependence of compressional, shear and Young’s moduli. As they can be calculated from the acoustic wave velocities (longitudinal and transverse) it is important to know accurately the velocity-stress function. Therefore the authors developed a petrophysical model, which gives the physical connection between the acoustic velocities and stresses. After estimating the model parameters by joint inversion, where the rock physical parameter is the common parameter, the velocities can be calculated at any arbitrary stresses and the pressure dependent elastic moduli can be derived. To prove the applicability of this method, we measured P and S wave velocities on sandstone samples with an automatic acoustic test system under uniaxial load. This paper includes one sample from these measurements together with literature data of a Berea sandstone sample. The results show that the misfits between measured and calculated data are small, the model can be applied well in practice.


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