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Elastic Properties of VTI Shales as a Function of Stress - Experimental Data in Comparison to the Theoretical Modeling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth EAGE Shale Workshop, May 2016, Volume 2016, p.1 - 5
Abstract
The stress conditions influence the elastic parameters and therefore the anisotropy of the shales. Such an influence is important for geophysical applications like an overpressure prediction from seismic data, or hydrocarbon production monitoring using time-lapse seismic measurements.
We present an application of a theoretical approach, known as porosity deformation approach (PDA) on our own experimentally obtained data. We introduce the theoretical background of the approach and validate it on a real data set. We propose an optimization algorithm called universal exponent approach (UNE) as an extension for PDA. We also propose the constant anellipticity approach (CAN), which is created for estimation of stress dependent inclined velocities in the transversely isotropic medium.
Moreover we present the experimentally measured full data set of velocities as functions of stress for two vertical transversely isotropic shales.