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Tullow sures up Kenya onshore discoveries

22nd January 2015

Tullow Oil has reported encouraging results from exploratory drilling in its operated blocks onshore Kenya

Tullow Oil has reported encouraging results from exploratory drilling in its operated blocks onshore Kenya
An Extended Well Test programme on the Ngamia and Amosing appraisal wells will commence in the second quarter 2015

“The Epir-1 wildcat well proved the existence of a working oil system in the North Kerio Basin, encouraging us to consider further exploration activities,” said Angus McCoss, Tullow’s exploration director.

“The Ekales-2 exploratory appraisal well is a bold step-out away from the South Lokichar Basin bounding fault with follow up potential. Continued success in the appraisal of the Ngamia and Amosing oil fields is highly encouraging as we continue with development studies for the South Lokichar Basin.”


The Epir-1 exploration well is located in Block 10BB in the North Kerio Basin, a separate sub-basin from that tested by the Kodos-1 well, 25 kilometres to the southwest. Whilst not a discovery, the well encountered oil and wet gas shows over a 100 metre interval of non-reservoir quality rocks, demonstrating a working petroleum system in this lacustrine sub-basin. Further exploration activities will be considered in the North Kerio Basin following analysis and integration of the valuable data collected from the well.

The Weatherford 804 rig drilled the Epir-1 well to a final depth of 3,057 metres. The well will be plugged and abandoned, following which the rig will move to the Ekales-2 location in the South Lokichar Basin where it will conduct appraisal of the discovery made by the Ekales-1 well. The well will target reservoirs in a separate fault block to the east of the discovery well, further away from the basin bounding fault.


Engomo-1 exploration well commenced drilling

The new SMP-106 rig has commenced drilling the Engomo-1 well, the first test of the prospective North Turkana Basin in Kenya Block 10BA. This onshore prospect is to the west of Lake Turkana where numerous naturally occurring oil slicks and seeps have been observed. A result is expected during early March 2015.


Ngamia and Amosing appraisal wells

The PR Marriott 46 rig recently completed drilling the Ngamia-5, Ngamia-6 and Amosing-3 appraisal wells.  Both Ngamia wells were drilled from the Ngamia-1 discovery well pad. Ngamia-5 was drilled to a final depth of 2,317 metres and was deviated approximately 500 metres northeast of Ngamia-1, encountering between 160 to 200 metres of net oil pay. Ngamia-6 was drilled to a final depth of 2,480 metres and was deviated approximately 800 metres north of Ngamia-1, encountering up to 135 metres of net oil pay. Both wells have been suspended and remain available for use in an Extended Well Test programme that will commence in the second quarter 2015.

The Amosing-3 well in Block 10BB continued the successful appraisal of the Amosing oil field. The well was drilled approximately one kilometre northwest of the Amosing-1 discovery well and successfully encountered over 107 metres of net oil pay in good quality reservoir sands. The well reached a final depth of 2,403 metres and has been suspended for use in future appraisal and development activities. The PR Marriott 46 rig will now be moved to continue the appraisal of the Ngamia field, drilling the Ngamia-7 well to test the field’s eastern flank.


South Lokichar Basin 3D seismic

Acquisition of the large 951 square kilometre 3D seismic survey has completed over the series of significant oil discoveries in the western basin bounding fault play of the South Lokichar Basin. The fast-track processed data is already being used in the south of the basin whilst the remainder of the survey will be available for seismic interpretation by the end of the first quarter 2015. Initial evaluation of the 3D seismic data indicates significantly improved structural and stratigraphic definition and additional prospectivity not evident on the previous 2D seismic data.  In addition, the partnership has acquired over 1,100 metres of core samples from the South Lokichar Basin wells and an extensive programme of detailed core analysis is ongoing that will provide results from the first quarter 2015 onwards, to measure oil saturation and assess recovery factors of the reservoir sands.

Tullow operates Blocks 10BB, 13T and 10BA with 50 per cent equity and is partnered by Africa Oil Corporation, also with 50 per cent.


Africa Oil is also the operator with 50 per cent interest of the Rift Basin Area Block in Ethiopia, Marathon Oil holding the remaining 50 per cent. A 2D seismic crew has been mobilised on the block and will commence the acquisition at the end of January of a 400 to 800 kilometre land and lake survey.

Source rock outcrops and oil slicks on the lakes have been identified in the block where there is no existing seismic or wells.

In light of the current market conditions Africa Oil has worked closely with its partners to streamline its 2015 work programme.

"We are very encouraged by the excellent well results from our recent appraisal programme at Ngamia and Amosing and we will shortly be commencing Extended Well Tests at both fields, which should further improve reservoir definition,” said Keith Hill, Africa Oil president and CEO.

“The hydrocarbon shows we have seen in the Kerio Basin are also very encouraging and prove we have a new basin with a working hydrocarbon system. We will be focusing our evaluation on identifying a prospect in that basin with a high chance of a robust trap and better quality reservoirs. We are well positioned to weather the current downturn in oil prices with no debt, primarily discretionary spending and low operating and development costs. Our goal in 2015 will be to keep the project moving forward while being financially conservative until oil prices show signs of recovery. We are also working closely with partners and host governments to move the pipeline project forward and resolve remaining tax and fiscal issues in the new pricing environment."

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