1. Department
of Petroleum Engineering, Faculty of Science and Technology, University of Stavanger, N-4036 Stavanger, Norway
2. Department
of Mathematics and Natural Sciences, Faculty of Science and Technology, University of Stavanger, N-4036 Stavanger, Norway
3. Department
of Petroleum Engineering and Applied Geophysics, Faculty of Engineering
Science and Technology, Norwegian University of Science and Technology, NTNU, N-7491 Trondheim, Norway