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Study on the Effect of Water Saturation on Acoustic Properties for Two Phase Medium Based Artificial Cores
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
The physical parameters of two-phase medium based reservoirs play an important role in seismic exploration and field development. Due to the advantages of controllable properties, stable performance, and high reproducibility, artificial cores have been widely applied in the research of seismic physical modelling. In this paper, we studied the properties of the artificial core samples based on quartz sands and epoxy resin, especially the influence of porosity and water saturation on the acoustic parameters, such as the wave velocities and elastic modulus. When the porosity was lower than 10%, the P wave velocities increased along with the water saturation; when the porosity was between 10% and 25%, the wave velocities almost increased linearly with the water saturation; when the porosity was higher than 25%, the velocities firstly decreased to the minimum value (water saturation of 0.4∼0.5), then returned to the value that was a little higher than the initial values. At the same time, the S wave velocities stayed almost unchanged as the water saturation increased. By comparing the elastic modulus of dry and water saturated samples, it was found that the Poisson’s ratio was the most sensitive factor among the parameters to identify the fluid in the porous samples.