Seismic Anisotropy as a Lithological Indicator

B026 SEISMIC ANISOTROPY AS A LITHOLOGICAL INDICATOR Abstract 1 Polar (VTI) anisotropy is now commonly used for large angle time and depth correction of gathers and for physical and consistent depth calibration. As basically an increase of anisotropy is linked to an increase of the shale content in the formation the variations of seismic anisotropy can be an indicator of variations in sand/shale ratio. After calculation of the effective anisotropy values from a 3 term high density time velocity picking the next step is to derive from them interval parameters which can be used for lithological predictions of the shaly