Chevron warns 4Q earnings below 3Q results Jan 11 06:46 PM US/Eastern (AP) - Chevron says its fourth-quarter profit will be significantly lower than the third-quarter results, partly because of weaker profit margins on refining and marketing. The oil giant said Wednesday that earnings from exploration and production of oil and gas will be similar to the previous quarter, but the usually profitable refining and marketing end of the business will be near break-even. Chevron shares fell $2.27, or 2.1 percent, to $105.50 in after-hours trading.