Tuesday, February 22, 2011

BG and Ophir to drill ahead in Tanzania deepwaters after their third victory at Chaza-1

BG group and Ophir Energy are planning to continue with their exploration activities off Tanzania after their third consecutive success with Chaza-1 in Block 1. The earlier two wells, Pweza-1 and Chewa-1, both in Block 4, discovered significant quantities of gas in them.


  • The JV comprising of Ophir Energy and BG Group are carrying out Tanzania’s first deepwater drilling campaign consisting of Blocks 1, 3 and 4. 
  • The blocks cover an area of about 28,050km2 area of the Mafia Deep Offshore Basin and northern portion of the Ruvuma Basin.

Exploration History:

  • Infill 2D seismic surveys were acquired in Block 1 in 2005 and Blocks 3 and 4 in 2006.  Further 2D and 3,500km2 of 3D seismic data across all three blocks were acquired in 2008 to mature a number of prospects to a drillable status.

  • First well, Pweza-1 on Block 4 discovered gas in 60m Eocene section
  • The next well Chewa-1 hit gas in a Palaeocene reservoir
  • Chaza-1 drilled on Block 1 hit gas in a secondary objective

Forward Plan:

  • The Joint Venture has contracted the semi-submersible rig Deepsea Stavanger to drill two to three wells during 2H 2010.  Following completion of the first drilling campaign a further 4,000km2 of 3D seismic data will be acquired during 1H 2011.
  • There are tentative plans to drill a second well in Block 1 targeting the Jodari prospect later this year.

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