Abstract

: Bassein field in Mumbai offshore is a giant gas field underlain by a thin oil-rim of around 10 meters and a thick aquifer. The field is under gas production since 1988 with an insignificant amount of oil production. With a cumulative gas production of over 120 BCM out of total reserve of 274 BCM, there is an apprehension that the thin oil column might have migrated into gas zone resulting in very little or no oil column left for any future production. In order to confirm the presence of oilrim, an RST survey was carried out in five wells of the field in flowing well conditions. The Alpha processed results of these wells were studied to see the changes in fluid saturations and their movement. Apart from So