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Abstract

The aim of this work is to utilize seismic velocities to incorporate vertical and lateral changes in elastic rock properties into geomechanical models. These properties, i.e. Young’s Modulus and Poisson’s Ratio, are used to populate geomechanical finite element (FE) models to quantify the effect of spatial variations in mechanical parameters on the orientation and magnitude of the present-day stress field. The commonly used layer cake approach is improved through this workflow. The data basis consists only of a compressional wave velocity cube and well logs for P- and S-wave velocities and density taken from the CO2CRC Otway project in SE Australia. Therefore the elastic and material parameters are inferred from empirical relationships to populate the geomechanical model. The results show the impact of the spatially varying rock parameters for all three principles stresses. Both location of maximum and minimum values and magnitude of the respective stress are changed in comparison to a commonly used layer cake approach. The results, however, need further validation since only one reference point with in situ data for the calibration of the model is available.

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/content/papers/10.3997/2214-4609.201414323
2015-10-13
2020-04-03
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201414323
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