The OPEC+ group saw its combined crude oil production rise by 140,000 barrels per day (bpd) to 42.71 million bpd in December, but the alliance was still 1.8 million bpd below its target, according to the Platts survey by S&P Global Commodity Insights. Russian production was mostly unchanged, while Nigeria saw a rebound in output to a several-month high, according to the survey. OPEC-only production was estimated by the monthly Reuters survey last week to have risen by 120,000 bpd in December from November, thanks to a rebound in Nigerian…