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Petroleum Resource Potential of Queen Charlotte Sound Within the Scott Islands Marine Wildlife Study Area

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Petroleum Resource Potential of Queen Charlotte Sound Within the Scott Islands Marine Wildlife Study Area 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
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