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Synthetic Modeling Study of the Effect of Attenuation Anisotropy in Fractured MediaNormal access

Authors: A. M. Ekanem, X. Y. Li, M. Chapman and I. G. Main
Event name: 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011
Session: Seismic Modelling II
Publication date: 23 May 2011
DOI: 10.3997/2214-4609.20149621
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 832.23Kb )
Price: € 20

The process of hydraulic fracturing is neither completely understood nor does a commonly accepted description exist. Its application in gas or oil industry is well known, but geothermal reservoir recovery and stimulation of ground water sources can also base on hydraulic fracturing. Knowledge of the fracturing process and thus a prediction of fracture growth would increase its reliability and efficiency. The goal of this work is to characterise the reflection of an acoustic wave at a single crack which is idealised as a thin fluid layer embedded in solid elastic media. The dependency of reflection coefficients for different incidence angles is investigated in a theoretical approach and is modelled by using the numerical layer-code software OASES. For small values of Poisson's ratio the reflection coefficient is nearly independent of the frequency of the wave. For incidence angles greater than ~30° the reflection coefficient is independent of the specific magnitude of P- and S-wave velocity, it only depends on their ratio. These results serve as a pre-study for a more complex setup, which can be randomly distributed cracks. In combination with reflection processing of microseismic events these results will help to estimate reservoir properties or improve the imaging of hydraulic fractures.

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