This one could be a gusher Thanks for nothing, Chevron ( NYS: CVX ) ! The nation's second-largest oil and gas company cautioned investors last week that earnings would come in substantially below last year's figures due to a combination of lower oil prices and production delays in Mississippi caused by Hurricane Isaac. While much of this is well beyond the control of Chevron, it cast a cloud over the entire oil sector, including offshore driller Transocean.