Mars should have massive petroleum deposits in its crust. What are we waiting for? Halliburton should be on their way now. Oh, wait, the lightweight fractions would be gone, we aren't talking light, sweet crude. Probably just bitumen. Well, we can blacktop the road to Cydonia, anyway.
And if Mars is such a hot bead of hydrocarbon fractions, how appropriate that we should just be discovering this while Mars is at it closest to Earth ever; only some 23 million miles away! Reach out and touch a Martian hydrocarbon deposit with one of those new celestial drilling rigs!