CLB 2018 Annual Report

23 Segment Revenue Segment Revenue For the Years Ended December 31, (dollars in thousands) 2018 % Change 2017 % Change 2016 Reservoir Description $ 413,082 (0.5)% $ 415,220 (2.6)% $ 426,205 Production Enhancement 287,764 23.7 % 232,599 41.8 % 164,027 Total Revenue $ 700,846 8.2 % $ 647,819 9.8 % $ 590,232 Segment Operating Income For the Years Ended December 31, (dollars in thousands) 2018 % Change 2017 % Change 2016 Reservoir Description $ 54,847 (17.5)% $ 66,500 (15.7)% $ 78,881 Production Enhancement 63,039 43.3 % 43,987 419.3 % 8,470 Corporate and other (1) 736 NM (519) NM 100 Operating Income $ 118,622 7.9 % $ 109,968 25.7 % $ 87,451 (1) “Corporate and other" represents those items that are not directly relating to a particular segment. "NM" means not meaningful. Segment Operating Income Margins (1) For the Years Ended December 31, 2018 2017 2016 Margin Margin Margin Reservoir Description 13.3% 16.0% 18.5% Production Enhancement 21.9% 18.9% 5.2% Total Company 16.9% 17.0% 14.8% (1) Calculated by dividing "Operating Income" by "Revenue." Reservoir Description Revenue for our Reservoir Description segment decreased slightly to $413.1 million in 2018 compared to $415.2 million in 2017 and $426.2 million in 2016. The decreases in revenues in 2018 and 2017 as compared to each corresponding prior year were primarily due to the reduced international and deepwater project activity levels during 2017 and 2018. This segment's operations continue to work on large-scale, long-term, crude-oil and LNG projects with an emphasis on producing fields located in offshore developments and international markets. We continue to focus on large-scale core analyses and reservoir fluids characterization studies in the Asia-Pacific areas, offshore Europe and Africa, offshore South America, North America, and the Middle East.