b'Costs Incurred in Oil and Gas ActivitiesThe following tables reflects total costs incurred, both capitalized and expensed, for oil and gasproperty acquisition, exploration, and development activities for the year.EquityMethodInvestmentU.S. Gulf Kosmos EquatorialGhana of Mexico Other(1) Total Guinea(2) Total(In thousands)Year ended December 31, 2018Property acquisition:Unproved . . . . . . . . . . . . . . $$ 302,688 $ 2,975 $ 305,663 $ $ 305,663Proved . . . . . . . . . . . . . . . .1,037,5111,037,5111,037,511Exploration . . . . . . . . . . . . . . . 3,182 69,673 199,423 272,278272,278Development . . . . . . . . . . . . . 110,401 21,252 4,569 136,222136,222Total costs incurred . . . . . . . . . $113,583 $1,431,124 $206,967 $1,751,674 $ $1,751,674Year ended December 31, 2017Property acquisition:Unproved . . . . . . . . . . . . . . $$$ 9,865 $ 9,865 $ $ 9,865Proved(3) . . . . . . . . . . . . . . 231,280 231,280231,280Exploration . . . . . . . . . . . . . . . 15,15055,632 70,78270,782Development . . . . . . . . . . . . . 1,364 1,3641,364Total costs incurred . . . . . . . . . $ 16,514 $$296,777 $ 313,291 $ $ 313,291Year ended December 31, 2016Property acquisition:Unproved . . . . . . . . . . . . . . $$$ 17,322 $ 17,322Proved . . . . . . . . . . . . . . . .Exploration . . . . . . . . . . . . . . . 11,871425,229 437,100Development . . . . . . . . . . . . . 265,451 265,451Total costs incurred . . . . . . . . . $277,322 $$442,551 $ 719,873(1) Includes Africa (excluding Ghana), Europe and South America.(2) For year ended December 31, 2017, represents 50% interest in KTIPI costs incurred from the dateof acquisition through December 31, 2017.(3) Represents cash paid to acquire 50% interest in KTIPI.Standardized Measure for Discounted Future Net Cash FlowsThe following table provides projected future net cash flows based on the twelve monthunweighted arithmetic average of the first-day-of-the-month oil price for Brent crude in the periodJanuary through December 2018. The average price is adjusted for crude handling, transportation fees,quality, and a regional price differential.Because prices used in the calculation are average prices for that year, the standardized measurecould vary significantly from year to year based on market conditions that occur.154'