The heterogeneity within a reservoir is difficult to predict, but the subtle changes of the seismic wave shape within any sequence provide valuable information about the reservoir and are preserved in 3D seismic data. In order to optimize the understanding of the reservoir, it is necessary to integrate geophysical, geological, petrophysical, reservoir and production data. Diagnostic tests and studies such as production logging, reservoir saturation, build up, pressure and temperature are commonly studied at the time of reservoir management in a developing field but off late seismic attribute is being used as an additional tool for reservoir management. With the advent of sophisticated algorithms and faster machines, today it is possible to extract a number of seismic attributes from within a particular sequence. In a heterogeneous reservoir or in an area of poor well control, synergistic study of seismic attributes can help us investigate the lateral variations in the quality of the reservoir and improve the imaging of reservoir units, providing vital clues for placing infill wells and injectors.

In the present study an attempt has been made to decipher the reservoir behavior in one of the western offshore fields of India. The field in question is in production from carbonate reservoir over last six years. At places, poor reservoir facies have been observed within the pay leading to poor transmissibility in the area thus affecting the voidage compensation in the targeted zone. Using the conventional tools, it was difficult to map the lateral facies changes in between wells. Efforts have been made to calibrate seismic attributes with other relevant data in order to arrive at a good prediction of the reservoir quality.

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