Kerogen, thermal maturity, crude oil inclusions, & pyrobitumens in Bowser and Hazleton Group, Bowser Basin, B.C. L.D. Stasiuk and N.S.F. Wilson Natural Resources Canada Geological Survey of Canada: Calgary

Purpose of todays presentation: kerogen (source rocks?), thermal maturity, distribution of crude oil-bitumen- pyrobitumen, temperatures, paragenesis etc.  Review of most current petrology (organic & sedimentary) data collected at GSC Calgary in Bowser  Review (briefly) previous thermal maturity data from Bowser Basin (Evenchick et al, 2002)

Methods  Organic Petrology: Reflected white and fluorescent light microscopy  Sedimentary Petrology: Transmitted & reflected light – fluorescence microscopy, fluid inclusion microthermometry  Organic Geochemistry – Rock Eval, biomarkers (?)

Samples in this study

Ritchie wells o N, o W Rock Eval – TOC Bowser Gp ? Hazleton Gp ? Source rock ?

Rock Eval – kerogen type Ritchie wells o N, o W

Terrestrial-dominated macerals in kerogen: deltaic, marine influence, Ritchie wells o N, o W Ritchie A-3-J, ’, Bowser and uppermost Hazleton ?

Terrestrial-dominated macerals in kerogen: deltaic, marine influence Ritchie A-3-J, ’, Bowser and uppermost Hazleton ?

Probable potential SPENT source rock: marine kerogen precursor ? Ritchie A-3-J, Hazleton Group ? Lower Jurassic 6745’, TOC = 2.4 % Equivalent to Nordegg of Alberta ?? Spent amorphous kerogen

Rock Eval – S1 and S2

Thermal maturity of Bowser and Hazleton groups – Vitrinite %Ro cond- dry gas dry gas rare Bowser ? Hazleton ? ~ o C

Pyrobitumens – early high %Ro and late low %Ro cond- dry gas dry gas rare Bowser ? Hazleton ? ~ o C ~ o C

Late ‘low’ maturity pyrobitumens in Ritchie C-62-G Ritchie C-62-G, late low %Ro pyrobitumen in fractures, 7235’ Ritchie C-62-G, late highly anisotropic pyrobitumen in late calcites, ’ ~ o C

Late - high maturity crude oil inclusions in Ritchie A-3-J, ’ Ritchie A-3-J, late crude oil inclusions in calcite and fractures, ’’

Ritchie A-3-J, late crude oil in intercrystalline areas in quartz cement, ’ Ritchie A-3-J, late crude oil in in calcite cement, ’ Late - high maturity crude oil (condensate) inclusions in Ritchie

35-45 o API > o API red green blue

Late - high maturity crude oil and condensate inclusions in Ritchie A-3-J. > 35-50/55 o API > o API

Tango Creek Formation Bowser Lake Group

Late - high maturity crude oil inclusions in Muskaboo Creek Fm, Bowser Lake Group > 55 o API

Late pyrobitumen in Muskaboo Creek Fm, Bowser Lake Group, Muskaboo Creek outcrop, o N, o W %RoRmean = 1.20, ~ 150 o C

Pyrobitumen: %RoRmean = 1.58 Late - high maturity crude oil inclusions and late pyrobitumen, Bowser Lake Group, o N, o W, outcrop Crude oil inclusions Host rock has a thermal maturity level of ~ > 3.6 %Rovitrinite (>240 o C). Late pyrobitumen altered to ~ o C

Late - high maturity crude oil inclusions, Bowser Lake Group, o N, o W, outcrop > o API

Late - high maturity crude oil inclusions, Tango Creek Fm, Sustut Group, o N, o W, outcrop > o API Late pyrobitumen: 1.91 %Ro, ~ o C Early pyrobitumen: 5.55 %Ro, ~ > 250 o C Crude oil inclusions

Evenchick et al., GSC Open File 4343, 2002

Tango Creek Formation Bowser Lake Group