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Exploration for evaluation of oil&gas resources | 12 Months Ended
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Dec. 31, 2020
Exploration for evaluation of oil&gas resources |
Exploration for evaluation of oil&gas resources | 34 Exploration for evaluation of oil&gas resources
(€ million) |  | 2020 |  | 2019 |  | 2018
Revenues related to exploration activity and evaluation |  |  |  | 34 |  | 17
Exploration activity and evaluation costs: |  |  |  |  |  |
- write-off of exploration and evaluation costs |  | 314 |  | 214 |  | 93
- costs of geological and geophysical studies |  | 196 |  | 275 |  | 287
Exploration expense for the year |  | 510 |  | 489 |  | 380
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs |  | 888 |  | 1,031 |  | 1,081
Tangible assets: capitalized exploration and evaluation costs |  | 1,341 |  | 1,563 |  | 1,267
Total tangible and intangible assets |  | 2,229 |  | 2,594 |  | 2,348
Provision for decommissioning related to exploration activity and evaluation |  | 93 |  | 109 |  | 77
Exploration expenditure (net cash used in investing activivties) |  | 283 |  | 586 |  | 463
Geological and geophysical costs (cash flow from operating activities) |  | 196 |  | 275 |  | 287
Total exploration effort |  | 479 |  | 861 |  | 750

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