Bowleven, the West Africa focused oil and gas exploration group traded on AIM is pleased to announce that the Sapele-1ST well drilling in the Douala Basin, offshore Cameroon has encountered a total of 23 metres of net hydrocarbon-bearing pay in the Omicron objectives based on the results of drilling, conventional wireline logs, samples of reservoir fluid and pressure data. A testing programme is expected to commence shortly.
Highlights
· 23 metres of log evaluated net hydrocarbon pay encountered in the Omicron objectives at Sapele-1ST.
· Preparing for testing programme at Sapele-1ST.
· Sapele-2 well progressing on schedule.
Sapele-1ST drilling update
The principal objective of Sapele-1ST was to appraise the Deep Omicron oil discovery encountered in the Sapele-1 exploration well. The well was also designed to intersect both the Upper and Lower Omicron objectives.
The well was drilled to a TVD of 3,634 metres (4,483 metres measured depth) in water depths of around 25 metres approximately 2 kilometres South East from the Deep Omicron oil discovery in the original vertical well.
Bowleven, as operator, provides updates for the reservoir sections encountered at Sapele-1ST below:
Upper Omicron
1.4 metres of net pay were intersected overlying approximately 24 metres of high quality reservoir which following sampling was confirmed as water bearing.
Lower Omicron
The well has intersected a log evaluated hydrocarbon interval that is interpreted to comprise fair quality thinly interbedded reservoir units. Provisional net pay is estimated to be approximately 11 metres, based on conventional wireline logs, with an average porosity of 17%. Fluid samples acquired during logging activities indicate the presence of light oil/gas condensate as reservoir fluid.
Deep Omicron
The well has intersected a log evaluated hydrocarbon interval that is interpreted to comprise high quality thinly interbedded reservoir units. Although less well developed at this location and with a corresponding lower net to gross ratio than the Sapele-1 motherbore, the provisional net pay is conservatively estimated to be approximately 10 metres, based on conventional wireline logs, with an average porosity of 19%. In addition, initial interpretation indicates that certain pay intervals identified in the original Sapele-1 well have been eroded at the Sapele-1ST location. It was not possible to recover, it is believed due to borehole conditions, reservoir fluid samples and pressure data from Deep Omicron. Consequently, pressure communication could not be confirmed from logging activities. The GC tracer however indicates the presence of a light high GOR oil.
Forward plan
Further detailed analysis, including test data, is now required to assess the implications of the Sapele-1ST well on current resource estimates. The impending Sapele-2 appraisal well results will also be integral to this process. The Company is now preparing to conduct a drill stem testing programme at Sapele-1ST. Following testing the intention is to release the Noble Tommy Craighead rig for a mandatory recertification process.
Due to the stratigraphic nature of the Omicron discoveries further appraisal will be required and is already underway and planned. The Sapele-2 well, intended to appraise both the Lower and Deep Omicron discoveries, is currently drilling with the Vantage Sapphire Driller rig and is expected to take a further 15 to 20 days (excluding testing). The rig is available for up to three well slots after Sapele-2 with the location selection process factoring in both ongoing technical evaluation and well results.
A map indicating the location of the Sapele-1ST well is available on our website www.bowleven.comunder the heading presentations; the presentation is titled "Sapele drilling locations". Previous press releases relating to Sapele-1 are available on our website in the 'Investor Relations, announcements section'.
An update announcement and conference call are planned on completion of the full test programme on Sapele-1ST. Further update announcements on drilling activities will be made as appropriate.
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