Wentworth wishes to provide an update of the Ziwani-1 exploration well, currently drilling in the Mnazi Bay Concession, Tanzania. As previously reported, the well was spudded on February 1, 2012 and was anticipated to take 35 to 40 days to drill. However, there have been some significant delays due to equipment down-time, additional activities not accounted in the well plan and extra bit changes. The 12 1/4" section of the well has been drilled to a depth of 1,606 meters. This section has been successfully logged and the 9 5/8" casing has been run. The 8 1/2" section of the well has now been drilled to a depth of 2,588 meters.  While there have been a number of gas shows to date, no significant channel sands were identified in the Pliocene or Miocene.  A number of sands have been identified throughout the Oligocene and drilling continues.  The plan is to complete the well to the original target depth of 2,700 meters and carry out a full logging program.  This will allow the well to be drilled to all the targets as originally planned in the Pliocene, Miocene and Oligocene.
Subject to conclusion of the exercise of the pre-emptive rights exercised by Maurel & Prom ("M&P") on Wentworth's acquisition of Cove Energy's interest in the Mnazi Bay Concession announced on January 30, 2012, Wentworth will pay 11.98% of the costs and hold a 39.925% participating interest in the Ziwani-1 well. M&P currently estimates that the total cost of the Ziwani-1 well will be $1.95 million net to Wentworth ($16.25 million in total).
Managing Director, Geoff Bury, commented:
"Although the results of the Ziwani-1 well are so far not as expected, the Company is working with M&P to analyze the data obtained and evaluate its impact on the upcoming exploration activities that will follow the planned work-overs of three existing wells in the Mnazi Bay gas field. We look forward to completing Ziwani-1 and focusing on the prospective areas within the block."
About the Mnazi Bay Concession
The Mnazi Bay Concession Area is located in coastal, south-eastern Tanzania in the Ruvuma (Rovuma) Basin. The area lies between Aminex and Tullow Oil's Ruvuma Concession Area and Ophir Energy and BG Group's offshore Block 1. Ophir and BG Group's Chaza-1 gas discovery lies just northeast of Mnazi Bay's marine border. The 756 km² concession area contains two discovered Tertiary aged gas fields (Mnazi Bay and Msimbati) and holds additional Tertiary, Cretaceous and Jurassic hydrocarbon potential. Four wells have been drilled to date: MB-1, MB-2, MB-3 and MS-1X, and all four wells encountered hydrocarbons. MB-1 is currently producing gas at a rate of 1.7-2.0 mmscf/d and this gas is transported via an 8", 27 kilometre pipeline to the Mtwara Power Plant where it generates electricity for numerous local communities.
END
Enquiries:
Wentworth
Bob McBean, Executive Chairman
rpm@wentworthresources.com
Eric Fore, Finance, Investor & Public Relations Manager
etf@wentworthresources.com
Panmure Gordon
Nominated adviser & broker
+44 (0) 20 7459 3600
Katherine Roe
Brett Jacobs
FirstEnergy Capital
Broker
+44 (0) 20 7448 0200
Majid Shafiq
Travis Inlow
College Hill
Investment relations adviser
+44 (0) 20 7457 2020
Nick Elwes
Catherine Maitland
Alexandra Roper
Axxept
Investment relations adviser
+47 (0) 99 22 0200
Per Arne Totland
About Wentworth Resources
Wentworth Resources is a publicly traded (AIM:WRL, OSE:WRL), independent oil & gas company with:  natural gas production; midstream and downstream assets; a committed exploration and appraisal drilling programme; and large-scale gas monetisation programmes, all in the Rovuma Delta Basin of coastal southern Tanzania and northern Mozambique.
FORWARD LOOKING STATEMENTS
This press release may contain certain forward-looking information.  The words "expect", "anticipate", "believe", "estimate", "may", "will", "should", "intend", "forecast", "plan", and similar expressions are used to identify forward looking information.
The forward-looking statements contained in this press release are based on management's beliefs, estimates and opinions on the date the statements are made in light of management's experience, current conditions and expected future development in the areas in which Wentworth is currently active and other factors management believes are appropriate in the circumstances. Wentworth undertakes no obligation to update publicly or revise any forward-looking statements or information, whether as a result of new information, future events or otherwise, unless required by applicable law.
Readers are cautioned not to place undue reliance on forward-looking information. By their nature, forward-looking statements are subject to numerous assumptions, risks and uncertainties that contribute to the possibility that the predicted outcome will not occur, including some of which are beyond Wentworth's control.  These assumptions and risks include, but are not limited to: the risks associated with the oil and gas industry in general such as operational risks in exploration, development and production, delays or changes in plans with respect to exploration or development projects or capital expenditures, the imprecision of resource and reserve estimates, assumptions regarding the timing and costs relating to production and development as well as the availability and price of labour and equipment, volatility of and assumptions regarding commodity prices and exchange rates, marketing and transportation risks, environmental risks, competition, the ability to access sufficient capital from internal and external sources and changes in applicable law.  Additionally, there are economic, political, social and other risks inherent in carrying on business in Tanzania and Mozambique. There can be no assurance that forward-looking statements will prove to be accurate as actual results and future events could vary or differ materially from those anticipated in such statements. See Wentworth's Management's Discussion and Analysis for the year ended December 31, 2011, available on Wentworth's website, for further description of the risks and uncertainties associated with Wentworth's business.
NOTICE
Neither the Oslo Stock Exchange nor the AIM Market of the London Stock Exchange has reviewed this press release and neither accepts responsibility for the adequacy or accuracy of this press release.
This information is subject of the disclosure requirements pursuant to section 5-12 of the Norwegian Securities Trading Act.
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