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11
We engaged three third-party engineering firms to prepare portions of our reserves estimates comprising
approximately 89% of our estimated proved reserves (by volume) at year-end 2012. The portion of our estimated
proved reserves prepared by each of our third-party engineering firms as of December 31, 2012 is presented below.
% Prepared
(by Volume) Operating Division
Ryder Scott Company, L.P........................................................................ 44% Northern, Western
PetroTechnical Services, Division of
Schlumberger Technology Corporation..................................................... 24% Eastern
Netherland, Sewell & Associates, Inc. ...................................................... 21% Southern
Copies of the reports issued by the engineering firms are filed with this report as Exhibits 99.1 through 99.3. The
qualifications of the technical person at each of these firms primarily responsible for overseeing his firm's preparation
of the Company's reserve estimates are set forth below.
Ryder Scott Company, L.P.
• over 30 years of practical experience in the estimation and evaluation of reserves
• registered professional engineer in the state of Texas
• Bachelor of Science degree in Electrical Engineering
• member in good standing of the Society of Petroleum Engineers and the Society of Petroleum Evaluation
Engineers
PetroTechnical Services, Division of Schlumberger Technology Corporation
• over 20 years of practical experience in petroleum geology and in the estimation and evaluation of reserves
• registered professional geologist license in the Commonwealth of Pennsylvania
• certified petroleum geologist of the American Association of Petroleum Geologists
• Bachelor of Science degree in Petroleum and Natural Gas Engineering
Netherland, Sewell & Associates, Inc.
• over 30 years of practical experience in petroleum engineering and in the estimation and evaluation of
reserves
• registered professional engineer in the state of Texas
• Bachelor of Science degree in Petroleum Engineering