You may be a little off base with your remarks about gas. The price you are referring to is domestic gas which has overwhelmed the system because of fracking. If I'm not mistaken, Chevron's primary exposure is foreign LNG which is a whole different world.
Just take a look at the interim report. You will see the impact of lower Natural Gas Prices in the US will not have much of an affect on Chevron's profits. Chevron is producing about 1,200 MMCFD of natural gas in the US. In 2011 they got about $4 per MCF and now the price is $2 per MCF. If you multiply it all out the total yearly loss would be about $880 million. On the other hand they are producing about 3,800 MMCFD of natural gas internationally and the price this quarter is up by about 40 cents per mcf. So that adds about $550 million if the price holds the rest of the year.
Part of the reason Chevron has been doing better than Exxon lately is that Chevron is considered more oily than Exxon. So the price of oil affects Chevron much more than the price of natural gas.