Reservoir petrophysical properties (including porosity, permeability and water saturation) are the most important characteristics of a hydrocarbon reservoirs that are used in economic evaluation, production planning and their development management. Accurate measurement of these properties is possible only by drilling wells and/or studying drilling cores, but by studying subsurface data (including petrophysical diagrams of drilled wells and reflective seismic information); we can find relations and based on them, estimate these reservoir properties for areas far from wells. In present study, the porosity of a part of the Qom Formation in the Aran anticline, located in Central Iran, is estimated using three-dimensional seismic data and porosity, density and P-wave sonic logs in three exploratory wells based on Model-based post-stack seismic inversion and using multi-attributes. The results show that the acoustic impedance indicator have the lowest error among the five used indicators. In addition, the amount of porosity in reservoir parts of the Qom Formation, between f and c₄ members,” from well A-01 toward well A-02 is more than well A-01 to well A-03.

Keywords: Seismic Interpretation, Seismic reversal, porosity estimation, channel systems, sound resistance

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