Acreage Producing Well Summary The following table sets forth the gross and net producing oil and natural gas wells in which we owned an interest at December 31, 2013: We operate 895 of the 1,535 producing wells presented in the above table. As of December 31, 2013, we owned interests in 14 wells containing multiple completions, which means that a well is producing from more than one completed zone. Wells with more than one completion are reflected as one well in the table above. The following table summarizes our developed and undeveloped leasehold acreage at December 31, 2013, all of which is onshore in the continental United States. We have excluded acreage in which our interest is limited to a royalty or overriding royalty interest. Our undeveloped acreage expires as follows: Oil Natural Gas Gross Net Gross Net Arkansas ............................................... — — 15 8.0 Kansas ................................................ — — 9 5.0 Louisiana .............................................. 17 5.4 452 252.4 New Mexico ............................................ 1 — 91 14.0 Oklahoma .............................................. 10 1.2 132 18.5 Texas ................................................. 121 79.1 661 436.3 Wyoming .............................................. — — 26 1.9 Total ................................................ 149 85.7 1,386 736.1 Developed Undeveloped Gross Net Gross Net Arkansas ........................................ 1,280 684 — — Kansas ......................................... 6,400 4,064 — — Louisiana ....................................... 95,138 60,726 34,699 30,298 Mississippi ...................................... — — 34,616 32,455 New Mexico ..................................... 10,240 1,896 — — Oklahoma ....................................... 38,080 5,707 — — Texas .......................................... 110,761 68,454 43,044 27,816 Wyoming ....................................... 13,440 927 — — Total ......................................... 275,339 142,458 112,359 90,569 Expires in 2014 .......................................... 13% Expires in 2015 .......................................... 11% Expires in 2016 .......................................... 15% Thereafter ............................................... 61% 100% 19