Exploration for evaluation of oil&gas resources

12 Months Ended

Dec. 31, 2018

34 Exploration for evaluation of oil&gas resources

(€ million)	2018		2017		2016
Revenues related to exploration activity and evaluation		17		9		4
Exploration activity and evaluation costs
- write-off of exploration and evaluation costs		93		252		170
- costs of geological and geophysical studies		287		273		204
Exploration expense for the year		380		525		374
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs		1,081		995		1,092
Tangible assets: capitalized exploration and evaluation costs		1,267		1,371		1,905
Total tangible and intangible assets		2,348		2,366		2,997
Provision for decommissioning related to exploration activity and evaluation		77		81		118
Exploration expenditure (net cash used in investing activivties)		463		442		417
Geological and geophysical costs (cash flow from operating activities)		287		273		204
Total exploration effort		750		715		621