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A Study of the Frequency-dependent Characteristics of Fractured Porous Media
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
At present, most studies have considered partial saturation and fractures separately. However, these two phenomena exist simultaneously in most fractured reservoirs. In this paper, we model and investigate the frequency-dependent characteristics of a fractured porous medium filled with two-phase fluids, gas and brine. Firstly, we construct a periodic layered porous model with layers alternately saturated with gas and water. Then we add a set of horizontal fractures evenly distributed in the gas-saturated layer. Finally, after the parameters of the fractured porous medium are determined, we analyse the effects of velocity and attenuation with frequency and incident angle and the impact of gas saturation on the velocity and attenuation. The numerical results show that the model displays significant dispersion and attenuation of the P-wave and converted S-wave in different ranges of incident angle. The attenuation in the fractured porous model is caused by the effects of partial saturation and aligned fractures. When the gas saturation is more than 0.2, the impact of aligned fractures is stronger than the partial saturation effect.