ExxonMobil and its partners have made an oil discovery at the Longtail-3 well in the Stabroek Block offshore Guyana.

The well has been drilled to a total depth of more than 6,100ft using the Stena DrillMAX rig.

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It is located approximately 3.5km south of the Longtail-1 well, where approximately 256ft of oil-bearing sandstone reservoir was identified in 2018.

Following the drilling, the Longtail-3 well encountered 230ft of net pay, including newly identified, high-quality hydrocarbon-bearing reservoirs below the original Longtail-1 discovery intervals.

ExxonMobil exploration and new ventures senior vice-president Mike Cousins said: “Longtail-3, combined with our recent discovery at Uaru-2, has the potential to increase our resource estimate within the Stabroek block, demonstrating further growth of this world-class resource and our high-potential development opportunities offshore Guyana.

“We will continue to leverage our core competitive advantages in our ongoing exploration campaign, delivering substantial value to the Guyanese people, our partners and shareholders.”

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The Stena DrillMAX will now be moved to drill the Whiptail-1 exploratory well on the Stabroek block, as part of the planned 15-well campaign.

The partners plan to use the Noble Sam Croft rig to support development drilling work for Liza Phase 2 development offshore Guyana.

In other drilling activity at the Mako-2 appraisal well in the Stabroek block, ExxonMobil confirmed the quality, thickness, and areal extent of the reservoir.

Together with the previously announced Uaru-2 discovery, the latest results suggest potential deployment of a fifth floating production storage and offloading vessel (FPSO) in the east of the Liza complex.

ExxonMobil affiliate Esso Exploration and Production Guyana operators the Stabroek Block with 45% interest.

Other partners include Hess Guyana Exploration (30%) and CNOOC Petroleum Guyana (25%), a wholly owned subsidiary of CNOOC Limited.