Where does the decline come from?

Guyana's monthly output ran at 915,000 barrels a day in January and peaked at 918,000 barrels a day in February. It then eased to 910,000 barrels a day in March and 903,000 barrels a day in April, and slipped to 895,000 barrels a day in May and 869,000 barrels a day in June. In all four of those months the direction was down.[1]

The loss comes from one place. Liza 1, the country's first project, produced 122,000 barrels a day in April against a first-quarter average of 129,000 barrels a day, and the gap is put down to natural decline at the field. The newer projects Liza 2, Payara and Yellowtail ran above nameplate and covered part of that gap, which is how the national total was held where it is.[1]

The ship has arrived; the calendar has not

The Errea Wittu reached Guyana's coast on 20 August. The vessel was built for Uaru, the country's fifth project, and is designed to add roughly 250,000 barrels a day. Two separate calendars sit behind the startup: the government says September, ExxonMobil guides to the fourth quarter. In the Stabroek block ExxonMobil holds 45 per cent, Chevron 30 per cent and CNOOC 25 per cent, and 1.996 billion dollars flowed into the country's sovereign wealth fund in the first half of the year.[1]

The binding constraint here is the commissioning calendar rather than geology or hardware. While the ship stands at the coast, the production curve still carries Liza 1's decline, and the difference between September and the fourth quarter directly changes how many barrels enter this year's balance. The 20 August column Fifteen blocks on the map, one drilling calendar behind them applied the same test to the Neuquén round: acreage on a map did not move that year's supply. Guyana is one step further along, because the hardware is physically there, and the test stays the same. The alternative reading is open too: if the government's September date holds, the gap closes within the quarter and the argument over the calendar loses its importance in hindsight.[1], [3]

The other end of the same weekend

On the same Sunday, Iran's oil minister Mohsen Paknejad announced that 7.5 trillion cubic feet, or 212.4 billion cubic metres, of gas had been found in Fars province in the south of the country, of which 5.7 trillion cubic feet is recoverable. He presented that volume as equal to 15 years of production from one phase of South Pars, the field shared with Qatar. Any production would be years away; alongside sanctions and chronic under-investment, the conflict destroyed roughly a quarter of Iran's daily gas production capacity.[2]

The two announcements sit at opposite ends of one line, measured by distance from a delivered barrel: in one the ship is at the coast and the argument is measured in months, in the other the field is on a map and the argument is measured in years. On the Guyana side the signal to watch is clear. If Uaru starts up during September, the country's monthly total returns above June's 869,000 barrels a day before the year ends; if startup slips to the fourth quarter, Liza 1's decline is carried alone for another quarter. The test date is 31 December 2026.[1], [2]