If there was any lingering doubt about what’s keeping Big Oil executives up at night, the fourth-quarter results cleared it up. It’s not slogans. It’s not transition optics. It’s whether they have enough high-quality barrels to avoid production decline in the 2030s. The majors are refocusing hard on upstream portfolio renewal for the next decade, according to WoodMac, who analyzed Q4 data. The near-term commodity backdrop isn’t exactly inspiring, and Brent looks soft. Refining margins are decent, petrochemicals less…