Seismic and Geological Interpretations of the Norne Field
Master thesis
Permanent lenke
http://hdl.handle.net/11250/240066Utgivelsesdato
2013Metadata
Vis full innførselSamlinger
Sammendrag
The art of seismic interpretation is an essential geophysical discipline before, during and after oil and gas is found (Tjåland, selection of verbal quotes). As there is no simple manual on how to carry out seismic and geological interpretations from a few selected 2D lines to the creation of 3D surfaces; this thesis written by me at the Norwegian University of Science and Technology (NTNU) seeks to highlight some of the practical techniques needed to succeed in such a task on real field data, as well as the corresponding geological results from the interpretation. Norne data was accessed through the IO Center at the NTNU web pages. Furthermore the data was kindly made available by Statoil and license partners (Norwegian University of Science and Technology, 2013).The Norne Field is located in the blocks 6608/10 and 6508/01, and was discovered in 1992 (Norwegian Petroleum Directorate). The approximately 9 x 3 〖km〗^2 horst block was found in the southern parts of the Nordland II area of the Norwegian Sea (Statoil, 2004). The Norne Field has several satellites; the Skuld Field was planned to start production in 2013 (Norwegian Petroleum Directorate).Wildcat well 6608/10-2 proved hydrocarbons in rocks of Lower and Middle Jurassic age, and about 80 % of the oil is believed to be located in the Ile and Tofte formations. Furthermore the hydrocarbon column contained approximately 110 m of oil and 25 m of gas. Most of the gas is found in the Garn formation.Thesis objectives are carefully described and defined throughout the following pages. The primary objectives are 2D and 3D interpretations of top reservoir (Top Garn) and cap rock (Top Spekk) reflectors and surfaces, respectively. Furthermore, primary faults and corresponding fault blocks defined to be block C, D, E and G, are interpreted. Secondary objectives include the interpretation of Top Ile, Top Tofte, Top Tilje and Top Åre, in addition to minor faults. Faults are first interpreted as fault pillars in the 14 selected seismic 2D lines, before their natural fault planes emerge from the resulting 3D surfaces. These natural fault planes and the selected 3D surfaces shape the sub surface topography of the Norne Field reservoir. The results could be suitable for further geological models. Sources such as literature and web pages give valuable insight into regional and local geology, lithology columns and well logs, and interpretation techniques. In addition to the information framework, an interpretation software has been used (I used Petrel) on the Norne Field data. At the end of this thesis I compare my personal interpretation of top reservoir (Top Garn) to the same surface found online (interpreted by Statoil), and evaluate method and results.