We had very strong results in our 2011 drilling program. We drilled 87 successful wells including 62 Haynesville shale wells and 20 Eagle Ford shale wells. The drilling program was one of the drivers of our 25% growth in proved reserves that we achieved in 2011. It added 228 Bcfe of new reserves and increased our proved developed reserves by 170 Bcfe.
We ended 2011 by closing an acquisition that established a new core area in the oil-rich Permian basin. As we have shifted most of our resources this year to growing our oil production, this acquisition gives us a low-risk vertical drilling program to complement our successful Eagle Ford shale program in South Texas. We also think we're very well positioned to be a significant player in the emerging horizontal Wolfcamp shale in the Permian basin.
I will turn it over to Roland to review the financial results for this quarter in more detail. Roland?
Roland O. BurnsThanks, Jay. On Slide 4, we show our oil and gas production on a daily basis the last 4 years and we also separate it by operating region. Production from the Haynesville shale program on the chart is shown in blue and now we're showing the contribution from our Eagle Ford program in yellow. In the fourth quarter of this year, our production averaged 277 million cubic feet of natural gas equivalent per day, 48% increase over the fourth quarter of last year but about 3% lower than production in the third quarter of this year. Oil production of 3,800 barrels per day in the fourth quarter was up 78% from the third quarter. And oil now makes up 8% of our total production, as compared to only 4% in the previous 3 quarters. Eagle Ford averaged 20 million per day in the fourth quarter, as compared to about only 9 million a day in the third quarter of this year. On December 31, we estimate that oil made up 16% of total production, which we put in the press release, when taking into account the Permian properties that we closed on, on December 29.