Covering approximately 2.6 million acres, Offshore Area 1 is located within the Rovuma Basin, approximately 40km offshore northern Mozambique. The water depth in the area is roughly 1,600m.
The area hosts the Prosperidade and Golfinho/Atum complexes, which further host several deepwater discoveries, including Windjammer, Barquentine, Lagosta, Camarao, Golfinho, Orca, and Atum.
The offshore fields are being developed as part of the larger Mozambique LNG Project, which also includes the construction of an LNG park within the Cabo Delgado Province of northern Mozambique.
The project aims at initially supplying approximately 100 million cubic feet of natural gas a day (MMcfd) to the onshore LNG facility. It is expected to generate approximately between 400 and 700 jobs during the construction phase.
Operator and ownership of Offshore Area 1
Offshore Area 1 is operated by Anadarko Mozambique Area, with a 26.5% working interest. The other partners in the area include National Oil Company Empresa Nacional de Hidrocarbonetos (15%), Mitsui E&P Mozambique Area 1 (20%), ONGC Videsh (16%), Bharat PetroResources (10%), PTTEP Mozambique Area 1 (8.5%), and Oil India (4%).
Anadarko had signed a heads of agreement (HOA) with Eni in December 2012, to collaborate in the development of the gas discoveries within the former’s Offshore Area 1 and the latter’s Offshore Area 4, including the common onshore LNG facility.
Discoveries within Offshore Area 1
The Windjammer, Barquentine and Lagosta fields were discovered in February, October and November 2010 respectively, while the Tubarao field was discovered in February 2011, followed by the Camarao field in October 2011, the Golfinho field in May 2012, the Atum field in June 2012, and the Orca field in April 2013.
Reserves at the Rovuma basin gas fields
The gas field is estimated to hold approximately 75 trillion cubic feet (Tcf) of recoverable natural gas.
Offshore Area 1 development details
A total of 60 production wells are proposed to be drilled at Offshore Areas 1 and 4 during the initial phases, which would increase to 120 wells in subsequent phases. The wells will be drilled using drill ships.
The Offshore Area 1 development project will involve the installation of subsea production systems, including subsea production trees, manifolds, chemical injection distribution facilities, flowlines, electro-hydraulic control umbilicals, and pipeline end termination (PLET) systems.
The output from the gas fields will be conveyed to the onshore LNG plant through a 45km-long subsea pipeline corridor.
A floating production unit is also proposed to be installed during the later phases of the project.
Mozambique LNG Park details
The LNG facility will primarily be equipped with two 6mtpa each LNG trains, two 180,000m³ each LNG storage tanks, condensate storage facilities, a multi-berth marine jetty, and ancillary utilities and infrastructure.
Contractors involved with the deepwater offshore gas project
The front-end engineering and design (FEED) studies for the offshore project are being performed by three separate groups, which include Technip, a joint venture (JV) of Subsea 7 and Saipem, and a JV of McDermott and Allseas.
The FEED contract for the LNG facility was also awarded to three separate parties, which include the JV of JGC Corporation and Fluor Transworld Services, the JV of a subsidiary company of CB&I and Chiyoda Corporation, and International Bechtel.
The engineering, procurement and construction (EPC) contract for the LNG facility has been awarded to the CCS JV, which is comprised of CB&I, Chiyoda Corporation and Saipem.
The pre-feasibility study for the LNG facility was jointly performed by KBR and Technip.