Goldman Sachs said in a research note released on Tuesday that the oil supply-demand balance is weaker than previously expected. The deduction is based on upside surprises to the third quarter production and greater clarity on new project delivery into the year-end.At last check, the WTI grade of crude oil was trading down $1.27 at $44.66.Surplus WoesAnalyst Damien Courvalin estimates a global surplus of 400 kilo barrels per day in the fourth quarter compared to the 300 kb/day draw estimated earlier. The surplus assumption is conservative, as it assumes only a limited additional increase in Libya/Nigeria production, the analyst said.Source