Mnazi Bay Concession

The Mnazi Bay Concession covers a 756km² area in south-eastern Tanzania, bordering Mozambique. In 1981, ENI drilled a shallow water, offshore well and discovered the Mnazi Bay Gas Field. The well was subsequently suspended and abandoned as there was no local demand for natural gas at that time.

Mnazi Bay Concession Maps

Source: Maurel et Prom

In 2005, Wentworth re-entered the existing shut-in well (MB-1) and successfully drilled two appraisal wells (MB-2 and MB-3) and one exploration well (MS-1X), all of which encountered hydrocarbons. The fourth and final well discovered the previously unknown Msimbati gas field. Wentworth went on to build two gas processing plants, 27km of 8” pipeline, and an 18MW gas-fired power plant.

Currently Wentworth owns a 41.78%(i) working interest in operations other than exploration on the block together with the operator, Maurel et Prom 38.22%, and TPDC 20%. Wentworth also owns a 52.225%(ii) working interest in exploration operations on the block together with Maurel et Prom’s 47.775% working interest.

2012 Work Programme(iii)

The 2012 Work Programme is well underway and consists of drilling one exploration well (Ziwani-1), work-overs of MB-2, MB-3, and MS-1X, and drilling one appraisal well or an additional exploration well.

Ziwani-1 Exploration Well Highlights

  1. Spudded on 1 February 2012(iv)
  2. The fifth well to be drilled in the Mnazi Bay concession
  3. Expected vertical target depth range is 1,800 to 2,500 meters
  4. Approximately 13km to the west of the producing Mnazi Bay and Msimbati gas fields (see map below)
  5. Targeting similar Miocene and Oligocene sandstones, which form the reservoirs of the Mnazi Bay and Msimbati gas fields
  6. Drilling time is estimated to be 35 days

(i)Subject to pre-emptive rights and government approval as announced in our press release dated 30 January 2012
(ii)Subject to pre-emptive rights and government approval as announced in our press release dated 30 January 2012
(iii)Wentworth is carried 70% by Maurel et Prom for the cost of one exploration well (Ziwani-1) and the cost of a 200km² 2D seismic survey (or cost equivalent), again subject to pre-emptive rights and government approval as announced in our press release dated 30 January 2012
(iv)As announced in our press release dated 1 February 2012

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