Characteristics of reflected waves in regular fractured media

The qualitative and quantitative effects of dynamics of waves reflected from fractured collector are analyzed. The azimuth dependences of seismic parameters on crack density, geometrical characteristicsof fractures and choose of the type of effective model of fractured media are estimated. The problem of connection of characteristics of effective model of fractured media with the physical properties of fractures is considered. The analyticalinstrument for the estimation of properties of the fractured media in terms of azimuth variations of seismic characteristics ofprimary reflected waves is suggested.
Materials and methods
Methods of effective media theory. Methods of numerical modeling of seismic wavefields in anisotropic media.
Results
Numerical modeling of cinematic and dynamic azimuth effects of body waves reflected from fractured reservoirs was realized. Dependence of azimuth anomalies on physical properties of fractures and choose of effective model was analyzed.
Сonclusions
• The methodology of determination of seismic characteristics of regularly fractured media in terms of elastic properties ofmatrix and fracture fill is proposed.• An instrument for a numerical modeling ofcinematic and dynamic azimuth effects ofbody waves reflected from fractured layersis developed.• The methodology of determination of fracturedensity in terms of effective parameters ofazimuth variations of AVO gradients, phasevelocities and chosen model of effectivemedia and borehole data is suggested.• The analytic method of determination ofparameters of fractured layer in terms ofazimuth variations of seismic characteristicsof reflected body waves is proposed.