Abstract
Summary Whitcombe (2002) established the Extended Elastic Impedance (EEI) as a seismic attribute as a mechanism for fluid and lithology prediction. Under certain approximations, EEI is the application of angle rotation in conventional acoustic impedance by combining intercept and gradient with varying angles to emphasize specific parameters. EEI could estimate the elastic parameters such as; S-wave impedance, V_p/V_s ratio, Bulk modulus, Shear modulus, Poisson’s ratio, and also provide petrophysical reservoir parameters such as porosity, clay content, and water saturation. EEI is considered as robust approach and has been implemented on this field study case in Pannonian Basin. Fluids and lithology prediction has been successfully demonstrated, particularly in areas where the acoustic impedance of gas saturated sands and adjacent shale is almost similar. The method distinguishes between seismic anomalies induced by lithology and those caused by fluid content. The idea of extended elastic impedance inversion is employed in this work to determine petrophysical parameters and reservoir facies distribution in order to construct a correlation between these estimated properties and the well log data. The results have demonstrated that EEI is a valuable approach to distinguish between reservoir and non-reservoir areas and to potentially locate hydrocarbons.
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