ExxonMobil adds ninth discovery offshore Guyana

• Hammerhead-1 well encounters 197 feet of high-quality, oil-bearing sandstone
• Discovery adds to estimated resource of more than 4 billion barrels
• Maximum offshore value creation through rapid development and accelerated exploration

Hammerhead-1 encountered approximately 197 feet (60 meters) of high-quality, oil-bearing sandstone reservoir. The well was safely drilled to 13,862 feet (4,225 meters) depth in 3,773 feet (1,150 meters) of water. The Stena Carron drillship began drilling on July 27, 2018.

“The Hammerhead-1 discovery reinforces the potential of the Guyana basin, where ExxonMobil is already maximizing value for all stakeholders through rapid phased developments and accelerated exploration plans,” said Steve Greenlee, president of ExxonMobil Exploration Company. “Development options for Hammerhead will take into account ongoing evaluation of reservoir data, including a well test.”

Hammerhead-1 is located approximately 13 miles (21 kilometers) southwest of the Liza-1 well and follows previous discoveries on the Stabroek Block at Liza, Liza Deep, Payara, Snoek, Turbot, Ranger, Pacora and Longtail. Those previous discoveries led to the announcement of an estimated recoverable resource of more than 4 billion oil-equivalent barrels discovered to date, and the potential for up to five floating production, storage and offloading (FPSO) vessels producing more than 750,000 barrels per day by 2025.

There is potential for additional production from significant undrilled targets and plans for rapid exploration and appraisal drilling. A second exploration vessel, the Noble Tom Madden, is due to arrive in Guyana in October to accelerate exploration of high potential opportunities and will commence drilling at the Pluma prospect approximately 17 miles (27 kilometers) from Turbot.

Liza Phase 1, which is expected to begin producing oil by early 2020, will use the Liza Destiny FPSO vessel to produce up to 120,000 barrels of oil per day. Construction of the FPSO and subsea equipment is well advanced. Pending government and regulatory approvals, Phase 2 is targeted for sanctioning by the end of this year. It will use a second FPSO designed to produce up to 220,000 barrels per day and is expected to be producing in 2022. A third development, Payara, will target sanctioning in 2019 and use an FPSO designed to produce approximately 180,000 barrels of oil per day as early as 2023.

The Stabroek Block is 6.6 million acres (26,800 square kilometers). ExxonMobil affiliate, Esso Exploration and Production Guyana Limited, is operator and holds 45 percent interest in the Stabroek Block. Hess Guyana Exploration Ltd. holds 30 percent interest and CNOOC Nexen Petroleum Guyana Limited holds 25 percent interest.

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Cautionary Statement: Statements of future events or conditions in this release are forward-looking statements. Actual future results, including project plans and schedules, resource recoveries and production rates could differ materially due to changes in market conditions affecting the oil and gas industry or long-term oil and gas price levels; political or regulatory developments; reservoir performance; the outcome of future exploration and development efforts; technical or operating factors; the outcome of future commercial negotiations; and other factors cited under the caption “Factors Affecting Future Results” on the Investors page of our website at www.exxonmobil.com. References to barrels of oil and similar terms include quantities that are not yet classified as proved reserves under SEC rules but that we believe will be produced in the future and moved into the proved reserve category.

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