The block covers 4,212 square kilometers southeast of Abu Dhabi city DUBAI: Abu Dhabi National Company (ADNOC) said on Wednesday it had signed an exploration concession agreement with Occidental Petroleum Corp. for onshore block 5. Occidental will have a 100 percent stake in the exploration phase and will invest up to $140 million, including a participation fee, it said. The block covers 4,212 square kilometers southeast of Abu Dhabi city.