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Exploration for evaluation of oil&gas resources (Tables) | 12 Months Ended
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Dec. 31, 2019
Exploration for evaluation of oil&gas resources |
Schedule of information about exploration for evaluation of oil&gas resources |
(€ million) |  | 2019 |  | 2018 |  | 2017
Revenues related to exploration activity and evaluation |  | 34 |  | 17 |  | 9
Exploration activity and evaluation costs |  |  |  |  |  |
- write-off of exploration and evaluation costs |  | 214 |  | 93 |  | 252
- costs of geological and geophysical studies |  | 275 |  | 287 |  | 273
Exploration expense for the year |  | 489 |  | 380 |  | 525
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs |  | 1,031 |  | 1,081 |  | 995
Tangible assets: capitalized exploration and evaluation costs |  | 1,563 |  | 1,267 |  | 1,371
Total tangible and intangible assets |  | 2,594 |  | 2,348 |  | 2,366
Provision for decommissioning related to exploration activity and evaluation |  | 109 |  | 77 |  | 81
Exploration expenditure (net cash used in investing activivties) |  | 586 |  | 463 |  | 442
Geological and geophysical costs (cash flow from operating activities) |  | 275 |  | 287 |  | 273
Total exploration effort |  | 861 |  | 750 |  | 715

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