Analysis of Seismic Attributes for Determination of Reservoir Properties of Jurrasic Sediments, Western Siberia

At modeling of oil and gas reservoirs confined to sedimentary deposits very often there are serious problems to forecast changes of rock properties of productive horizons. Reservoir properties have a sharp variation both on horizontal and vertical directions. For correct interpolation of these properties it is necessary to consider factors which are controlled of theirs variations. Certainly, large influence on rock properties of pores and caverns are rendered conditions of sedimentation as main part of porosity volume is formed at this stage. Goals of 3D seismic interpretation are a reconstruction of sedimentation conditions and a definition of reservoir properties by using significant correlations between petrophysical properties and seismic attributes for a target interval. A number of attributes and 3D cubes (instantaneous amplitude, AVO intercept; acoustic impedance) are calculated from standard seismic cube (after processing) for extraction of the maximal information. Seismic attributes, as we understands them, are generalized quantitative characteristics of a seismic record (Taner, 2001) which are calculated from seismic cube. We use such petrophysical parameters as: effective and general thicknesses and effective and average porosities. These parameters are calculated from the analysis of logging data.