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Image courtesy of Tullow Oil.

UK-based Tullow Oil finished a series of four exploration and appraisal projects at onshore blocks 10BB and 13T in Kenya, turning up a mixed bag of results.

The Kodos-1 exploration wildcat in Block 10BB was the first well drilled in the Kerio Basin, northeast of the successful South Lokichar Basin.

Hydrocarbon shows were encountered at the well indicating the presence of an active petroleum system, Tullow said.

However, reservoirs were of mixed quality alluvial sands close to the basin boundary fault.

The Weatherford Rig-804 drilled Kodos-1 to a final depth of 8,202 feet.

Kodos-1 will be plugged and abandoned.

Further drilling in the greater Kerio Basin can be expected during 2015 to follow up on “encouraging hydrocarbon shows,” the company said.

The Ekosowan-1 well in block 10BB was drilled in the South Lokichar Basin, about 7.4 miles southeast and up-dip of the previous Amosing-1 oil discovery.

The well encountered a 900 meter section of near continuous oil shows throughout an interval of tight faulted sands, extending the proven oil basin in the block southwards.

The Ekosowan area is located in the the South Lokichar Basin where 3D seismic survey is ongoing.

Tullow said follow up drilling will target better developed reservoirs expected between Amosing-1 and Ekosowan-1.

The well will be plugged and abandoned.

The Sakson PR-5 rig drilled the Ekosowan-1 well to a final depth of 6,656 feet.

Meanwhile, the Ngamia-4 well in Block 10BB continued the successful appraisal of the Ngamia oil field.

The well successfully encountered up to 120 meters of net hydrocarbon pay, with about 80 meters of oil.

Ngamia-4 was drilled about half a mile west of the Ngamia-1 discovery well to a final depth of 5,951 feet.

The well has been suspended for use in future appraisal and development activities.

The SMP-5 Workover Rig has successfully completed four flow tests on the Twiga-2A well in Block 13T.

Production rates at Twiga-2A were between 150 and 3,270 barrels of oil per day under natural flow with no depletion, the highest oil production rate seen to date in Kenya.

Tullow said that with optimized equipment the maximum flow potential from the best zone could have increased to around 10,000 barrels of oil per day, demonstrating excellent reservoir deliverability.

Tullow Operates Blocks 10BB and 13T with 50 percent equity. Vancouver-based Africa Oil Corporation holds the remaining 50 percent.