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

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.

Reassess Vitrinite %Ro from Evenchick et al, 2002

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.

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

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

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

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

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

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

875/92

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

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

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

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

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

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

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

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

Sedimentary petrology

EP Calcite filled porosity with HC inclusions

EP Pyrobitumen lining pores - dissolution - HC inclusions

EP Leached Pore space

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

EP