The presentation attempts to show an application of spectral decomposition as a qualitative tool for fast delineation of different origin carbonate bodies. Two cases coming from Polish Permian Basin are discussed. Both of them are connected with objects hardly visible on regular amplitude seismic sections. In the first case spectral analysis was focused on slumps situated at the foot of carbonate platforms where in recent years hydrocarbon occurrence was confirmed in some places. The second case concerns reefs associated with older Zechstein Limestone deposits. The common feature of both structures is wedge shape external slope make perfect condition for spectral decomposition.<br>Comparing pictures obtained from spectral analysis with results of amplitude interpretation and inversion modeling revealed striking similarity. It is clearly visible that working with discrete frequency images can exposed a structural framework on a very initial stage of seismic interpretation. Furthermore these images not only confirmed the amplitude anomaly seen on the traditional amplitude map but also illuminated structures seemingly impossible to detect because of the tuning phenomenon. Due to the different object thickness digitally blending of chosen frequency slices can enhance geological contents on final pictures. <br><br>


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