South Sudan Circle has a 4.5% carried interest in Block 11A. The operator of the block and owner of 85.5% of the block is Houston based ERHC Energy Inc. The government of Kenya retains the remaining 10% interest. Block 11A encompasses 11,950.06 square kilometers or 2.95 million acres (click on map to enlarge). The Block is situated on Kenya’s border with South Sudan to the north, Block 11B and Lake Turkana to the east and near Kenya’s border with Uganda to the west. Block 11A is in the vicinity of Blocks operated by one of the most prolific oil and gas explorers in Africa. Drilling activity in the area has made international headlines recently. The Eliye Springs well is in the adjacent Block 10BA while the Loperot and Ngamia-1 wells in Block 10BB are also nearby. The regional geology and structural evolution of Block 11A is dominated by the Cretaceous Central Africa Rift System (CARS) and the Tertiary East Africa Rift System (EARS) with the associated basin depositional trends. The main surface feature of Block 11A is the Lotikipi plain. This broad depression measures approximately 110 km from east to west. The proximity and in-trend relationship between the Lotikipi plain and the Abu Gabra Rift basins of southern Sudan suggest high oil and gas prospectivity. The southern Sudan basins are established petroleum provinces. Surface exposures of the sedimentary units with potential source and reservoir value, represented by the Cretaceous/Paleogene Lapur Formation of the Turkana Grits, give an indication of the sediments that might be encountered beneath the Lotikipi plain. Gravity data, acquired earlier in the area, enabled the delineation of a sedimentary basin within the Block 11A area below the Lotikipi plain. The basin-fill is believed to be in excess of 5,000 meters, well above the threshold for sufficiently buried and mature organic matter for oil generation. East Africa has emerged in recent years as an exciting, new oil province with the discovery of over 1 billion barrels of recoverable oil in Uganda’s Block 1 (EA1), the Ngamia-1 oil discovery in Kenya, which is estimated to be bigger than the Ugandan discovery, and large gas discoveries, including the recent Zafarani find, offshore Tanzania. Of major implication to the petroleum system in the Block 11A area, the Loperot well recovered light paraffinic oil sourced from an excellent type 1 oil-prone lacustrine shale. Even more important have been the significant oil columns encountered by the Ngamia-1 well.
From ERHC's web site:
The proximity and in-trend relationship between the Lotikipi plain and the Abu Gabra Rift basins of southern Sudan suggest high oil and gas prospectivity. The southern Sudan basins are established petroleum provinces. Surface exposures of the sedimentary units with potential source and reservoir value, represented by the Cretaceous/Paleogene Lapur Formation of the Turkana Grits, give an indication of the sediments that might be encountered beneath the Lotikipi plain.
Gravity data, acquired earlier in the area, enabled the delineation of a sedimentary basin within the Block 11A area below the Lotikipi plain. The basin-fill is believed to be in excess of 5,000 meters, well above the threshold for sufficiently buried and mature organic matter for oil generation.
The Block is ERHC’s first exploration acreage in East Africa, which has emerged in recent years as an exciting, new oil province with the discovery of over 1 billion barrels of recoverable oil in Uganda’s Block 1 (EA1), the Ngamia-1 oil discovery in Kenya, which is estimated to be bigger than the Ugandan discovery, and large gas discoveries, including the recent Zafarani find, offshore Tanzania.
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