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Petrological insights into thermal maturity, source rocks, migration, diagenesis L.D. Stasiuk and N.S.F Wilson Natural Resources Canada Geological Survey.

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Presentation on theme: "Petrological insights into thermal maturity, source rocks, migration, diagenesis L.D. Stasiuk and N.S.F Wilson Natural Resources Canada Geological Survey."— Presentation transcript:

1 Petrological insights into thermal maturity, source rocks, migration, diagenesis L.D. Stasiuk and N.S.F Wilson Natural Resources Canada Geological Survey of Canada

2 Thermal maturity – progress Reassess Vitrinite %Ro from Evenchick et al, 2002 (~ 160 samples). New Vitrinite % Ro and Tmax from Rock Eval for about ~ 200 samples.

3 Reassess Vitrinite %Ro from Evenchick et al, 2002

4 Petrology of Organic Matter and Rock Eval Evaluation of Potential Source Rocks Osadetz et al. have defined ‘Effective Petroleum Systems’ in Bowser Basin related to petroleum stains / shows proposed to come from: 1.a Paleozoic carbonate marine source rock deposited in a mesohaline to hypersaline setting (for stains in Muskaboo Creek Assemblage at Tsatia Mountain); 2.Mesozoic lacustrine – non-marine source rocks (for stains in Triangle zone) 3.Mesozoic normal marine source rock in Richie Well stains (e.g. 6745’) and in stains near Bucking Horse & Spatsizi River intersect.

5 Aptian to Albian to Campanian Tango Creek Formation; Non- marine potential hydrocarbon source rocks

6 Black shales (44/89, /92 series) : Bowser Basin: , 8.4 % TOC just North of Kitchener Lake. Sustut Basin 4.7 % TOC, near Stikine River-Cullivan Creek crossing for source rocks in the mid-late oil window (0.90 to 1.2 %Ro vitrinite). Coaly partings: % TOC Aptian to Albian to Campanian Tango Creek Formation: non-marine potential hydrocarbon source rocks in triangle zone

7 Rock Eval pyrolysis for Tango Creek, Triangle Zone and Sustut Basin (for Rocks with vitrinite %Ro > 1.0 – 1.5 and Tmax > 450 C – i.e. late oil window to condensate - dry gas

8 Rock Eval pyrolysis for Tango Creek ?? for coals and black shales with vitrinite %Ro > and Tmax > C – i.e. condensate - dry gas

9 Tango Creek shales – 8 % Total Organic Carbon Terrestrial – cuticular organic matter in coals and shales Upper Jurassic to Upper Cretaceous deltaic deposits, Bowser and Sustut basins

10

11 Vitrinite %Ro = 0.87 Aptian to Albian to Campanian Tango Creek Formation; Non-marine potential hydrocarbon source rocks – coals ?

12 875/92

13 Rock Eval pyrolysis for Skelhorne assemblage for coals and black shales with vitrinite %Ro of and Tmax > 600 o C – i.e. dry dry gas to sub-green schist

14 Recycled lacustrine Type I kerogen source rock clasts in Eagles Nest Assemblage (reworked from Muskaboo Creek ??)

15 Recycled lacustrine Type I kerogen source rock clasts in Eagles Nest Assemblage (reworked from Muskaboo Creek ??) Vitrinite %Ro Fluorescent lightWhite light

16 Fluorescent light Recycled lacustrine Type I kerogen source rock clasts in Eagles Nest Assemblage showing Pediastrum like morphology (freshwater, e.g. lacustrine algae) Modern

17 Some Pediastrum species also is characteristic of the littoral zone of oligotrophic waters

18 Crude oil generation from recycled lacustrine Type I kerogen source rock clasts in Eagles Nest Assemblage and migration of higher API oils in microfractures

19 High maturity recycled possible lacustrine Type I kerogen source rock clasts in Tango Creek, Eagles Nest and Todagin assemblage; Gas Zone, 1.0 to 1.4 %Ro

20 Evenchick et al., 2002 Recycled lacustrine Type I kerogen source rock clasts in Eagles Nest Assemblage (reworked from Muskaboo Creek ??) Some Pediastrum species also characteristic of the littoral zone of oligotrophic waters

21 Sedimentary petrology

22 EP Calcite filled porosity with HC inclusions

23 EP Pyrobitumen lining pores - dissolution - HC inclusions

24 EP Leached Pore space

25 EP Calcite cements Pyrobitumen + HC Inclusions Pore space – Fewer HC incs

26 EP


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