Abstract

This paper deals with improved imaging below Kalol which has been a challenge for the processors involved in data processing of Cambay Basin till date. The 3D seismic data acquired in Wamaj low area of Cambay Basin, India by the departmental crews of ONGC for the exploration of Basin centre gas accumulation in the year 2005-06 has been re-processed. Prior to this attempt, data has been processed twice for basic processing and subsequently pre-stack time migration. Interpreters, however, felt difficulty in mapping the deeper horizons e.g. YCS, OCS & Olpad formations below Kalol resulting in not meeting the objective of exploration of deep gas in this depression of the basin. The area is well known for the multiple of Kalol masking these deeper horizons as well as poor penetration of energy due to attenuation of high frequency from the coal seams. In order to make a meaningful Interpretation below Kalol a need was felt to re-process the data once more with special emphasis to image below Kalol.