The Orca-1 well, which targeted a previously untested Albian play, exceeded pre-drill expectations encountering 36 m of net gas pay in excellent quality reservoirs. In addition, the well extended the Cenomanian play fairway by confirming 11 m of net gas pay in a down-structure position relative to the original Marsouin-1 discovery well, which was drilled on the crest of the anticline. The location of Orca-1, approximately 7.5 km from the crest of the anticline, proved both the structural and stratigraphic trap of the Orca prospect, which the company estimates has a mean gas initially in place (GIIP) of 13 trillion ft3.
In total, the company believes that Orca-1 and Marsouin-1 have de-risked up to 50 trillion ft3 of GIIP from the Cenomanian and Albian plays in the BirAllah area, more than sufficient resource to support a world-scale LNG project. In addition, a deeper, untested Aptian play has also been identified within the area and surrounding structures.
The Orca-1 result demonstrates highly calibrated AVO, which provides further confidence in the ability to predict the presence of high-quality gas charged Cenomanian and Albian reservoirs within the 400-km long inboard Mauritania/Senegal gas basin.
Commenting on the results of the Orca-1 well, Chairman and CEO, Andrew G. Inglis, said: “The Orca-1 well concludes a very strong year for exploration and appraisal in Mauritania and Senegal. Orca-1, which we believe is the largest deepwater hydrocarbon discovery in the world so far this year, further demonstrates the world-scale quality of the Mauritania gas basin. With sufficient resource in place at the BirAllah hub, Kosmos looks forward to working with the Government of Mauritania and its partners to bring benefits to the people of Mauritania through the development of cost competitive, low carbon intensity projects.”
Following the positive drilling result and due to the scale and materiality of the Orca-1 discovery, Kosmos is extending the timeline of its Mauritania/Senegal sell down process into 2020, giving potential bidders additional time to analyse the new data.
Located approximately 125 km offshore Mauritania, the Orca-1 well was drilled in approximately 2510 m of water to a total measured depth of around 5266 m.
Partners in the BirAllah gas hub, located offshore Mauritania, include SMHPM, BP, and Kosmos.
Read the article online at: https://www.oilfieldtechnology.com/exploration/28102019/gas-discovery-made-offshore-mauritania/