Acknowledgements We are greatful to the Ministry of petroleum, Sudan, Sudapet, Chevron Oil Company, GRAS Sudan, Petrodar, and Robertson Research International for supplying essential data that enabled this work to be carried out. Especial thanks to Mr Awad Abdel-Fatah the Undersecretary of Sudan’s Oil Ministry and Mr Abu baker Elsheikh Alnoor. Thanks to Dr Awad B. Ibrahim and Mr Mohamed Ali Idris of the Central Petroleum Laboratories (CPL), and Sudapet, Khartoum, for fruitful discussions and to their data management team; Mohamed Alameen Abdel Hameed, Mohamed Adam, Azhari Abdel Gadir, Abdel raheem, Abu Zeid Hassan Salih, and Mohamed Salih Ali. Schlumberger is acknowledged for making available the PetroMod software used in this work and thanks to our computer lead Judith Christie for computer support. The manuscript has benefited from constructive comments and important suggestions by the Associate editor Michael Abrams and anonymous reviewers.
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