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Geleki Oil & Gas Field that covers an area of about 25<br>sq. km. was discovered in 1968. The main hydrocarbon<br>bearing formations are Tipam Sandstone of Miocene<br>age, Barail of Oligocene age and Kopili of Eocene age<br>containing all together of 35 sand layers (Fig-1). As on<br>01.07.2007, the field has OIIP 127 MMt in PD category<br>and Ultimate Reserves of 32 MMt in PDD categories.<br>The field has so far produced about 12.60 MMt of oil.