She is against exploration of natural gas. Many of the same areas with oil also contain natural gas.
I cannot understand this propensity for natural gas. I have nothing against natural gas or any other energy source. Natural gas prices have fluctuated wildingly. There is not world market for natural gas. Natural gas is used for electricity generation, a poor usage of a vital resource. The rats and NIMBY supporters are fighting against importing natural gas. We are going to replace high oil prices with high natural gas prices if Pelosi and TBone get their way.
Now we're getting down to the real issue!
I believe it's based on the fact that the combustion of CH4 produces somewhat less CO2 per evolved BTU than the combustion of other hydrocarbons. ( 117,00 lbs/billion BTU versus 164,000 lbs for "oil" : NaturalGas.org )
This leads to the doctrine that it is a "cleaner alternative", and hence an "alternative fuel".