U.S. oil prices saw narrowed gains on Tuesday due to rise of U.S. dollar index and higher crude oil inventory in Oklahoma's Cushing area.

Index of U.S. dollar grew more than 0.3 percent in the afternoon session on Tuesday while crude oil inventory increased by around 754,000 barrels in the previous week, according to a report by market information supplier Genscape.

Crude oil futures traded on Chicago Mercantile Exchange registered solid growth in the morning session and once reached 71.4 U.S. dollars per barrel with the approach of Tropical Storm Gordon.

U.S.-based oil company Anadarko Petroleum Corp. said it had closed two platforms and evacuated workers along the Gulf Coast.

The West Texas Intermediate (WTI) for October delivery increased 0.1 percent, or 0.07 U.S. dollar, to settle at 69.87 dollars a barrel on the New York Mercantile Exchange.