After Obama trashed the oil leases in Utah, Wyoming and Nevada, then screwed up the Gulf with the permit moratorium, the resources for domestic production took a pretty big hit. If we are increasing output in spite of all that intentionally inflicted damage, I'm surprised.
Places like Texas and North Dakota, producing on private, not federal lands, are helping to pull up the total.
Same technology advances in steerable, horizontal drilling combined with hydraulic fracturing are increase oil the same way the natural gas is growing. 
Now it should be even better if the feds and states like California and Alaska would get behind the ideas of growing production and jobs, instead of strangling it with regulations and overly taxed.