Analysis of Channels Using Acoustic Impedance and Spectral Decomposition within Cenomanian- Turonian Reservoir in Iran

Channel patterns are studied to detect subtle changes and to determine reservoir characteristics within Cenomanian–Turonian carbonate reservoir in an oil field located in the SW of Iran. The Cenomanian–Turonian carbonate reservoir consists of several buried channels which would certainly be interesting candidate to verify probable places of hydrocarbon accumulation in the SW of Iran. In this study, firstly iso-frequency maps are estimated using FFT method, and then acoustic impedance is obtained based on seismic inversion. The iso-frequency maps can help to clarify the channel patterns through observed variations of the channel frequency content. The opposite behaviour of the acoustic impedance is confirmed to determine reservoir characteristics using the seismic inversion method. Based on the obtained results, the channel patterns can be classified into two types in several stratigraphic levels of the Cenomanian–Turonian carbonate reservoir based on the different frequency content and the acoustic impedance from their surroundings. Finally, integrated analysis of the iso-frequency maps with the acoustic impedance maps reveals porous parts of the channel patterns with more detail than single analysis of the acoustic impedance maps.