Master Thesis in Geosciences 1 Depositional environment, sequence stratigraphy and reservoir properties of an Eocene mixed siliciclastic- carbonate succession in the Ainsa Basin, Southern Pyrenees Asfaw Tenna Woyessa Depositional environment, sequence stratigraphy and reservoir properties of an Eocene mixed siliciclastic- carbonate succession in the Ainsa Basin, Southern Pyrenees Asfaw Tenna Woyessa Master Thesis in Geosciences Discipline: Petroleum Geology and Geophysics Department of Geosciences Faculty of Mathematics and Natural Sciences UNIVERSITY OF OSLO 01.05.2008 © Asfaw Tenna Woyessa, 2008 Tutor(s): Professor Johan Petter Nysuen, Professor Roy Gabrielsen and Dr. Micheal Heermans, UiO This work is published digitally thr ough DUO – Digitale Utgivelser ved UiO http://www.duo.uio.no It is also catalogued in BIBSYS ( http://www.bibsys.no/english ) All rights reserved. No part of this publication may be reproduced or transmitted, in any form or by any means, without permission . Woyessa, A. T. 200 8 5 ACKNOWLEDGMENTS I would like to express my deepest gratitude to my supervisor Professor Johan Petter Nystuen for his constant supervision, guidance, and valuable advices, without his support the research may not assume the present form. I am also very grateful to my co-supervisors Professor Roy Gabrielsen, Head of the Depa rtment of Petroleum Geology and Geophysics at the University of Oslo, and Dr. Micheal Heermans for their support. I would like to thank Dr. Cai Puigdefabreg as for his introduction to the studied area, guidance and invaluable descriptions of interes ting features of the Ainsa Basin. I would also like to thank Erlend Morisbak, Gilbert Ako and Roger Flåt for the interesting discussions and the memorable times we spent together during the entire period of the Thesis work. I am highly indebted to anyone who has given me any helpful comments and suggestions to any part of this Thesis work. I would also like to thank my parents and my sisters and brother who have given me every support I need ed. I also thank my colleagues of the MSc student 2006-2008 class in Geosciences discip line for sharing experiences and knowledge during the time of study. I would like to express my gratitude to my Scholarship sponsor, Norwegian State Education Fund (Lånekassen), for financing of my study at the University of Oslo. Finally, I acknowledge NorskHydro AS (now St atoilHydro AS) for providing me financial support for field work of the study. Oslo, June 2008 Asfaw Tenna Woyessa Front Page: General overview of the study area (Observation direction: North to South).