Oil futures have risen over 7% since to five-week highs, as the move was seen as putting a floor under the market.
However, the U.S. oil options market skewed toward buying of put options, used to either bet on or protect against downside movement.
Trading volumes for U.S. crude futures puts and calls for November delivery gained over 40% to Wednesday, the day of the OPEC+ meeting, from Tuesday, data from CME Group showed.
On Thursday and Friday, volumes in puts totaled 15,579 and 25,771, respectively, while volumes in calls totaled 16,087 and 42,291, CME Group data showed.
In the futures market, crude spreads widened on Friday, with near-term contracts rising at a faster rate than later-dated contracts.