PROJECTSLatest Petroleum News[06.14.2010] British Gas Spins Bit in Offshore Tunisia Development. In late May 2010,?British Gas Tunisia Limited (BG) was testing Hasdrubal A4ST3 in its?Hasdrubal field, offshore Pelagian Basin. [02.08.2010] Apex plans wells in Sfax Offshore Permit. Atlas Petroleum Exploration Worldwide Ltd (APEX) plans to appraise the Jawhara structure in the Sfax Offshore exploration permit, offshore Pelagian Basin [11.11.2009] Petrofac Resources International Ltd (Petrofac) is planning to tie a pre-drilled third well (Chergui-3) into the Chergui field central production facility in Kerkennah Island in 2010. [08.20.2008] Apex Strikes Oil Offshore Tunisia. Atlas Petroleum Exploration Worldwide Ltd. (Apex) reached a total depth of 7,231 feet (2,204 m) with the Ras El Besh 3 (REB3) well on the Sfax Offshore Permit in Tunisia. |
SALLOUM DISCOVERYIn November 1991 British Gas found oil in the wildcat Salloum #1 (SAM1), drilled to a total depth of 3,371m at an offshore location northeast of Sfax 2km from the coast. The well tested at a rate of 1,800 BOPD of 41° API oil (no water) & 385 MSCFPD, from pay zone in the objective Upper Cretaceous Douleb/Bireno carbonates through perforations at 3,205-3259m.
This discovery is in close proximity and similar in structural nature to the onshore Gremda and El Ain fields which were discovered in 1980 and 1982 respectively, and also the Rhemoura field which was discovered in 1991. All of the oil in these fields is produced from the limestones and dolomites of the Late Cretaceous Bireno Formation.
At the Bireno level the Salloum structure is interpreted by APEX as a large faulted anticlinal dome, cut by a major north-northwest to south-southeast trending fault. The Salloum discovery comprises the eastern, upthrown fault block. At the crest, the structure is separated into two domal highs by a northwest-southeast oriented stress relief fault. In general, the reservoir characteristics of the Bireno at Salloum include porosities that range from 10% to 25% with corresponding permeabilities that range from < 1 mD to over 500 mD. Although lowest known oil is at 3259m., the probable oil/water contact in the field lies between 3263 and 3276m (-3241mTVDSS & -3264mTVDSS) based on log and core analysis. 
Due to the sparse nature of the 2D seismic coverage in the Salloum area, APEX decided with its partner to acquire a transition zone 3D survey over the area. The survey, initiated on July 8, 2007 was completed on July 22, 2007. Although still awaiting delivery of the final processed volumes, preliminary evaluation of the data is bearing up the validity of APEX’s intitial interpretation.
Based on APEX’s current structural interpretation of the Douleb, an attic well location could get as much as 35m higher on the structure and potential reserves are considered by APEX to be in excess of 35 MMBO. |