Petroleum Resource Potential of Queen Charlotte Sound within the Scott Islands Marine Wildlife Study Area. Report prepared for University of Victoria (UVic) – Ministry of Energy, Mines and Petroleum Resources (MEMPR) Partnership Program Dr. Torge Schuemann Dr. Michael Whiticar School of Earth and Ocean Sciences University of Victoria 2007 Table of contents I Table of contents 1 Executive summary...........................................................................................................................1 2 Technical summary...........................................................................................................................2 2.1 Input ..........................................................................................................................................3 2.2 Methods.....................................................................................................................................6 2.3 Results.......................................................................................................................................6 2.3.1 Tertiary sourced petroleum system...................................................................................8 2.3.2 Mesozoic sourced petroleum system ..............................................................................11 2.4 Recommendations...................................................................................................................13 3 Introduction.....................................................................................................................................15 3.1 Previous work .........................................................................................................................15 3.2 Geological backround .............................................................................................................17 3.2.1 Structure..........................................................................................................................17 3.2.2 Stratigraphy.....................................................................................................................17 3.3 This study................................................................................................................................18 4 Input Data........................................................................................................................................24 4.1 Reflection seismic...................................................................................................................24 4.1.1 Stratigraphic units ...........................................................................................................25 4.1.2 Faults...............................................................................................................................25 4.2 Well interpretation ..................................................................................................................27 4.2.1 Lithologies ......................................................................................................................27 4.2.2 Distribution & quality of source rocks............................................................................29 4.2.3 Distribution and quality of reservoir rocks .....................................................................30 4.2.4 Distribution & Quality of cap rocks................................................................................31 5 Calibration data...............................................................................................................................32 5.1 Maturation indicator................................................................................................................32 5.2 Heat flow.................................................................................................................................33 6 Calibration.......................................................................................................................................34 6.1 Heat flow.................................................................................................................................34 6.2 Vitrinite reflectance ................................................................................................................35 7 Results.............................................................................................................................................36 Table of contents II 7.1 Structure and stratigraphy.......................................................................................................36 7.2 Maturation...............................................................................................................................36 7.3 Migration and trapping ...........................................................................................................36 7.4 Seismic reflection data and 2D model construction ...............................................................39 7.5 Modeling.................................................................................................................................40 7.5.1 Vitrinite reflectance ........................................................................................................40 7.5.2 Transformation ratio .......................................................................................................41 7.5.3 Timing of transformation and deposition of reservoir rocks ..........................................42 7.5.4 Evolution of main accumulations and possible biodegradation .....................................43 8 Discussion.......................................................................................................................................58 8.1 Input parameters......................................................................................................................58 8.1.1 Lithology.........................................................................................................................58 8.1.2 Heat flow.........................................................................................................................59 8.1.3 Migration along faults.....................................................................................................59 8.1.4 Structure..........................................................................................................................60 8.2 Calibration...............................................................................................................................61 8.3 Previous work .........................................................................................................................61 8.4 Risk factors .............................................................................................................................62 8.5 Outlook ...................................................................................................................................63 9 References.......................................................................................................................................64 10 Appendix.....................................................................................................................................67 10.1 Predicted present day vitrinite reflectance..............................................................................67 10.1.1 Constant heat flow ..........................................................................................................67 10.1.2 Rift heat flow ..................................................................................................................68 10.2 Predicted accumulations .........................................................................................................69 10.2.1 Cenozoic petroleum system ............................................................................................69 10.2.2 Cenozoic petroleum system ............................................................................................78 10.2.3 Mesozoic petroleum system............................................................................................87 10.2.4 Cenozoic and Mesozoic petroleum systems ...................................................................96 List of figures III List of figures Figure 1. Map of Queen Charlotte Basin with location of seismic line 88-02 chosen for the 2D petroleum systems modeling presented in this study. Wells used for calibration are marked in orange................................................................................................................................................2 Figure 2. Modified stratigraphic chart from Haggart et al (2005), showing the main stratigraphic units used to define the 2D PSM. Prominent source-, reservoir-, and seal-rock units are marked. Source rocks are either marine oil-prone (green) or terrestrial gas-prone (red). Letters in brackets refer to individual intervals of Unit 1 and 2 (see also Table 2).....................................................................4 Figure 3. Reflection seismic image of the modelled part of GSC line 88-02 (Rohr and Dietrich, 1990 & 1992) with interpretation (above) and results of the 2D basin modeling showing predicted accumulations and main migration pathways(below).......................................................................5