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Wednesday, May 12, 2021

U.S. Geological Survey may have grossly underestimated massive Guyana-Suriname basin potential

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The U.S. Geological Survey (USGS) assessed the potential for undiscovered conventional oil and gas fields within priority geologic provinces of South America and the Caribbean as part of the USGS World Petroleum Resources Project. Thirty-one geologic provinces were assessed in this study, which represented a complete re-assessment of the South America−Caribbean region published in 2000 (U.S. Geological Survey World Energy Assessment Team, 2000).

Locations of 31 provinces of South America and Caribbean assessed in the USGS study

The provinces that were assessed represent a wide range of tectonic settings and evolution, stratigraphic fill, thermal evolution, petroleum systems, and exploration history. USGS said at the time several provinces were estimated to have significant undiscovered conventional oil potential, including the Guyana−Suriname Basin Province with a mean of 13.6 billion barrels of oil and 32 billion cubic feet of gas.

However, since 2015, U.S. oil major ExxonMobil has made an unprecedented series of oil discoveries offshore Guyana which are now fast approaching the USGS 13 billion barrels mark. To date, more than 9 billion barrels of oil equivalent (boe) have already been found and upwards of 20 prospects are yet to be targeted. Additionally, 5 discoveries have already been made offshore Suriname. US multinational investment bank and financial services company Morgan Stanley says its modelling of Block 58 shows that it contains a potential 6.5 billion boe. Between Guyana and Suriname, resources to date therefore already exceed 15 billion boe.

And this is just the tip of the iceberg. ExxonMobil believes the prolific Stabroek Block where it is operator of an area equivalent to more than 1000 blocks in the Gulf of Mexico, could contain more than double the volume of oil it has already found.

“It’s still early days in the programme but we continue to be very encouraged, and we estimate the resource potential of the basin to be more than double what we’ve already discovered,” ExxonMobil Senior Vice President of Upstream, Neil Chapman, told investors in March.

Geologists and experts in the oil and gas industry have long been intrigued with similarities between the MSGBC Basin – Mauritania, Senegal, The Gambia, Guinea Bissau and Guinea Conakry, off the coast of West Africa and that of the Guyana-Suriname Basin.

IHS Markit expert, Jerry Kepes, has said the Atlantic Margin play extends as far north as Norway, and all the way down to the southern areas offshore, in the deep water of Argentina on the west side of the Atlantic, and then South Africa on the east side. He said this concept is called Conjugate Margin Pair Basins because plate reconstruction shows that parts of South America and North America fit right into Africa and Europe before the plate split.

“Basically, you had very similar basins being developed on both sides of the Atlantic. The Guyana Basin offshore Guyana and Suriname where ExxonMobil and others have made such extraordinary discoveries, they are analogous pair bases with the MSGBC Basin on the other side,” Kepes said.

Just last week, ExxonMobil announced another discovery at the Uaru-2 well where it encountered approximately 120 feet (36.7 meters) of high-quality oil-bearing reservoirs including newly identified intervals below the original Uaru-1 discovery. The oil major is also pursuing an aggressive exploration and appraisal campaign this year offshore Guyana targeting around 12 to 15 wells in a variety of play types which analysts say will further increase the recoverable resource in the basin.

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