South Belridge Oil Field is the fourth-largest oil field in California and one of the most productive in the U.S.
David McNew | Getty Images
Oil prices were mixed on Monday with U.S. crude rising as a tropical storm in the Gulf of Mexico forced rigs to shut down, but the gains were kept in check by wider concerns about excess supply and falling demand for fuels.
U.S. West Texas Intermediate crude futures were up 9 cents, or 0.2%, at $37.42 a barrel by around 0050 GMT.
Brent crude was down 3 cents at $39.80 a barrel.
Both contracts ended last week lower, a second consecutive week of declines.
Tropical Storm Sally gained in strength in the Gulf of Mexico west of Florida on Sunday and was poised…