Heritage Oil ‘s rank wildcat Buffalo-1, a new discovery in the Butiaba region of Block 1 in Uganda, is potentially the largest in the Butiaba Area to date. The well encountered 15 metres of net gas pay and over 28 metres of net oil pay within a 123 metre gross interval. The well was in an early stage of evaluation as of December 2008.
Buffalo-1 was drilled some 500 metres from the crest of the structure to a total depth of 637 metres. Downhole pressure testing and sampling confirmed the presence of dry gas and moveable oil that has been recovered to surface. The company says that reservoir quality in all pay zones is excellent, with the gas and oil columns encountered being 48 metres and 75 metres respectively with the potential to be even larger.
Executives at Tullow Oil, which is partner to Heritage Oil on the lease, enthuse that “Buffalo-1 is the fifth successful test of the Victoria Nile delta play fairway within the Lake Albert Rift Basin”. It was drilled 16 km north-east of the Warthog-1 and Kasamene-1 discoveries. This latest result extends the play further north and de-risks several adjacent prospects, located in Blocks 1 and 2, which are scheduled for drilling in 2009.
The well has now been suspended as a future producer and the rig moved five km south to the location of the Giraffe prospect where drilling commenced in late December 2008. This well will also appraise some of the upside potential of the Buffalo discovery.
Tullow has interests in three licences in the Lake Albert Rift Basin in Uganda. Tullow operates Block 2 with a 100% interest and has a 50% interest in Blocks 1 and 3A which are operated by Heritage Oil (50%).
French supermajor TOTAL has flowed 6,000 barrels per day 40° API oil, in turbiditic reservoirs, in the wildcat Etisong 1, located in the southeastern corner of Oil Mining License (OML) 102, offshore southeastern Nigeria.
“The well constitutes the first step of an exploration and appraisal programme from 2009 to 2010 designed to demonstrate the feasibility of a new development pole on OML102”, according to a company release. That new development pole will combine the Etisong main discovery and the surrounding structures.
OML 102 is run by the joint venture between Nigeria’s state hydrocarbon company Nigerian National Petroleum Corporation (NNPC), which holds 60% and TOTAL, which operates the JV with 40%. “The Etisong main discovery when confirmed by further appraisal results should contribute toward helping to meet the Government’s objective of renewing national reserves”. Etisongi\ is located in a water depth of 70 metres, in the area within about 15 kilometers from the Ofon Field.
The Etisong-1 well was drilled by the Trident VIII jackup to a total depth of 2,207 metres.
CNODC Nigeria has initiated prequalification of contractors to process the 3D seismic data it acquired on the Nigerian Oil Prospecting Lease, OPL 471, in shallow offshore western Niger Delta. The China National Oil Development Corporation (CNODC), a subsidiary of the Chinese state behemoth CNPC, wants a full kirchoff post stack time migration (PSTM)processing for the 1,200sq km survey, which was acquired in 15-45metre water depth at bin size of 12.5 x 25 and a 60 fold coverage. The company says record length is nine seconds(in time depth). CNODC won OPL 471 in a bid round in 2006 and signed a Production Sharing Contract with the state hydrocarbon company NNPC in 2007. The seismic processing contract is to be awarded by first quarter 2009 and processing must be completed in a maximum of six months from receipt of input tapes
Nigerian independent South Atlantic Petroleum Ltd (Sapetro) may have commenced drilling the near-field exploration well Seme SW, around the Seme oil field, in Block 1. The Sèmè SW target had previously been identified but whether this becomes the company’s first operated well in Benin remains to be seen. It is understood the Noble Drilling’s jack up rig ‘Don Walker”, currently in Cameroon, has been contracted to do the job as the structure lies in around 30metres of water. Block 1, including Sèmè field, covers 551 sq km in the shallow waters of the Benin Embayment, at the maritime border with Nigeria.
It was awarded in December 2004 and is held 100% by Sapetro. In March 2007, Sapetro completed a 360 sq km 3D seismic survey over the Sèmè field and its environs. It is believed this data will form the basis for a redevelopment plan of the Sèmè field aimed at putting the field back into production. Sapetro has a share in the development of the Akpo deepwater field off Nigeria. Its chairman is General Theophilus Danjuma, formerly minister of defense under Olusegun Obasanjo.
FRENCH MAJOR TOTAL HAS SUCCESSFULLY appraised its 2005 discovery Mostarda-1. The appraisal well Mostarda 2G1, was suspended at a Total Depth of 5,150metres subsea, but TOTAL did not provide details of the hydrocarbon find. Mostarda 1 was drilled in the Ultra deepwater Block 32 in late 2005 and flowed 5,347 BOPD of 30 degree API oil.
NORWEIGIAN OPERATOR, STATOILHYDRO has mapped out plans for a large two dimensional 2D seismic coverage of the 11,099- sq km deepwater block 2, frontier acreage of the Indian Ocean in the course of 2008. A first well is still far in the distance, but state hydrocarbon company Tanzanian Petroleum Development Corporation TPDC has a 10% back-in right in the event of a commercial find..
A PARTNERSHIP CONSISTING OF AFRICA Oil and Range Resources have secured a drilling rig for their proposed 2008 drilling programme in Puntland. The first well is planned to spud in July. The rig contract became effective February 19 and covers the drilling of two wells with a two well option.
The ETP rig No 3, newbuild rig currently being constructed in the Shengli, and scheduled for completion in May, will mobilize to Jebel Ali in Dubai before moving onto Somalia. ETP rig No 3 Is owned by Singaporean firm Energi Tata Persada Pte Ltd. The rig is a 1,500 High Pressure(HP) unit, equipped with the latest drilling technology, including a top drive and three 1,600 HP pumps. The camp facility will house up to 150 persons. ETP will also provide the trucking and hoisting equipment as part of its contractual obligations.
NIGERIAN INDEPENDENT ORANTO IS continuing a 1,500-sq km Marine 3D seismic survey started offshore Sierra Leone on the West African coast. The essential block is SL-5 and is being executed for Oranto by the Chinese owned Bureau of Geophysics BGP vessel Pioneer SV. Oranto says that the shoot will likely extend over nearby SL-4, and the job may be coupled to a planned 1,500 – sq 3D shoot in Oranto’s LB-12 in neighbouring Liberia.
THE KILAWANI NORTH-1 (KN-l) WELL has encountered what operator Aminex describes as substantial natural gas column, in offshore Tanzania’s Nyuni/East Songo- Songo license area. The fluid is in Lower Cretaceous sandstones, the same formation that produces gas commercially in the neighbouring SongoSongo gas field. Preliminary evaluation indicates a gas-water contact approximately 30 metres deeper than at the adjacent Songo-Songo Gas field. This indicates that the KN-1 discovery is in a separate structure to the Songo-Songo field, thus enhancing the prospectivity of the remaining leads and prospects within the Nyuni licence. Formation pressures confirm the presence of gas over a gross interval of approximately sixty metres. KN- 1 was drilled as a vertical hole to a depth of 2030 metres (6,687 ft), ahead of schedule. Electric logging has been completed. KN- 1 will now be completed as a gas production well pending hook-up for production and a test will be conducted to determine flow capacity and reservoir properties. Further appraisal drilling will be required to define the extent of this discovery. This is a positive outcome for the potential of other exploration prospects and leads in the Nyuni licence area. KN- 1 also encountered minor oil shows in the Neocomian reservoir section, as well as confirming the presence of potential reservoirs in the Tertiary section at an earlier stage in the well.
The Nyuni/East Songo-Songo licence is a component of Aminex’s acreage portfolio in East Africa, which includes the highly prospective Ruvuma Basin area of Tanzania as well as large acreage positions in Madagascar and Kenya, on all of which new seismic has now been acquired. Aminex is also currently participating in the Malak- 1 exploration well in the West Esh ElMeilahah concession in Egypt, which spudded on 25 February and is drilling ahead on schedule. “We are now seeing the first real fruits of our work on the East African margin over several years, says Aminex chairman Brian Hall. “Our exploration team has long believed in the potential of this area, both for oil and gas. KN-1 is a totally new, deep structure which opens up several avenues for further exploration on the licence and strengthens the case for oil on the East African margin. This frontier area, where we were an early pioneer, is now the subject of strong industry interest. Credit is due to our explorationists and operations personnel, as well as to our JV partners who have made a strong technical input to this project and to TPDC (Tanzanian national oil company) and the Tanzanian Ministry who have provided invaluable cooperation from the outset. ”Partners in the license are Ndovu Resources Ltd. (Aminex subsidiary and operator) 40%, RAK Gas Commission with 25%, Key Petroleum Ltd. holds 20%, East African Exploration Ltd. 10%, and the remaining 5% is held by Bounty Oil & Gas Ltd.
A 90 DAY, 700 SQ KM 3D SEISMIC SHOOT ended in February 2008 in the 1,305-sq Bock J offshore Equatorial Guinea. The crew was BJP Pioneer SV.