Indonesian Oil & Gas Book 2008 118 Natuna Sea Block A PSC Chevron's subsidiary Amoseas Indonesia Ltd became the operator after Sumatra Gulf Oil Ltd. Amoseas installed Anoa Natuna FPSO (floating production storage and offloading) and commenced oil production from the field in April 1990. Fact Sheet Type of Contract : PSC Location : West Natuna Sea (Offshore), Riau Islands Area : 5,000 sq km Operation Status : Production Operator : Premier Oil Natuna Sea BV Contract Signing : October 16, 1979 End of Contract : October 16, 2009 (extend) Participants : Premier Oil (28.67%) Kufpec (33.33%) Hess Corporation (23%) Petronas (15%) � � � � � � � � � � � � � � � � � � � � � � � � � � � ����������� Natuna Besar Island ���������� ��������� ������ � ������� ������������ In 1996, Premier Oil took over the operatorship after acquiring Amoseas' interest in the block. Premier's main focus was the commercialization of the gas reserves in the block. Following the signing in early 1999 of a gas sales agreement to supply gas from West Natuna area to Singapore, Premier and its partners in the West Natuna Consortium started developing their combined gas reserves of 2.5 trillion cubic feet. The West Natuna Consortium commenced sales of gas to Singapore's SembCorp Gas from Anoa platform in January 2001. Gas production equipment was installed on the Anoa platform to facilitate early deliveries. Deliveries were later made from the Anoa gas export (AGX) platform which was successfully brought onstream in June, ahead of the gas contract delivery date of July 15, 2001. Overview The Natuna Sea Block A PSC is located in the Natuna Sea, covering an area of 5,000 sq km with water depths of between 250 and 350 feet. It is about 1,100 km north of Jakarta. Geologically, it is part of the West Natuna Basin. Agip Indonesia Ltd was the first operator of the block. Agip found first indication of potentially commercial hydrocarbons in the block in 1974 at the AQ-1X well, which due to poor seismic trap definition clipped the edge of what subsequently known as Anoa field. In the mid 1970's, Agip relinquished its interest in Block A and Sumatra Gulf Oil Ltd took operatorship and developed the Anoa field.