Geochemical Characteristics of Oil and Gas Accumulations Used to Define the Petroleum Systems of the Browse Basin Dianne Edwards, Emma Grosjean & Nadege Rollet with contributions from Steve Abbott, Ron Hackney, Kamal Khider, Megan Lech, Chris Nicholson, Rowan Romeyn & Jennie Totterdell
NW Margin Team, Energy Systems Group, Resources Division RIU Good Oil Conference, Freemantle, 2–3 September 2015 GEOCAT 83966
Distribution of Hydrocarbons in the Browse Basin • Proven gas, condensate and oil province (26 accumulations; t 11 commercial for gas) • LNG production infrastructure in progress • Ichthys pipeline (Inpex/Total)
Gwydion
• Prelude FLNG (Shell/Inpex) • Browse Joint Venture (Woodside)
100 km
• Oil accumulations on the Yampi Shelf (Cornea, Focus, Gwydion and Sparkle) and Caswell-2
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Browse Basin: Caswell Sub-basin & Yampi Shelf Permit awarded: Murphy Oil and Mitsui Permit awarded: Santos and Inpex
AC15-3 W15-18
Closing Date: 29 Oct 2015
W15-3 W15-4
Closing Date: 21 April 2016
RIU Good Oil Conference, Freemantle, 2–3 September 2015
4 Mesozoic Petroleum Systems Westralian 3 Early Cretaceous Echuca Shoals oil & gas Westralian 1 + 2 Jurassic Plover + Vulcan (thick) gas Westralian 1 + 2 Jurassic Plover + lower Vulcan Wet gas Modified from Barrett, 2004 Kennard et al., 2004 le Poidevin et al., 2015 Kuske et al., 2015
Westralian 1 Early – Middle Jurassic Plover, gas RIU Good Oil Conference, Freemantle, 2–3 September 2015
1
Westralian 2 3
Petroleum System
Browse Basin Stratigraphy: Source Rocks
Source Rocks Marine shales
Echuca Shoals & Jamieson, Heywood
Marine shales
Vulcan
Pre-rift coals, fluvio-deltaic shales
Plover
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Petroleum System
Browse Basin Stratigraphy: Reservoirs
1 + 2 Caswell 2 1
Westralian 3
Main Reservoirs Caswell Sub-basin & Yampi Shelf Echuca Shoals, Jamison & Heywood Brewster Mbr
Vulcan
“Ichthys Sst”
Plover
RIU Good Oil Conference, Freemantle, 2–3 September 2015
2
Reservoirs Heywood Graben Vulcan
1
1 + 2 Heywood
Westralian 3
Petroleum System
Heywood Graben Stratigraphy: Reservoirs
Plover Triassic Nome RIU Good Oil Conference, Freemantle, 2–3 September 2015
Accumulations and Shows by Reservoir: E–M Jurassic
Plover
Plover
Plover
CGR Plover Argus, Kronos <10 bbls/MMscf Scott Reef Trend ~10 to <30 bbls/MMscf Ichthys/Prelude ~10 to <30 bbls/MMscf Dry Gas Heywood Graben 22 to 37 bbls/MMscf Wetter Gas
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Accumulations and Shows by Reservoir: Late Jurassic
CGR Brewster Mbr/Vulcan Fm Ichthys
Ichthys/Prelude/Burnside ~60 bbls/MMscf Wet Gas
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Accumulations and Shows by Reservoir: Early Cretaceous GORs Echuca Shoals Gwydion 149 MMscf/bbl Adele
Cornea CGRs Echuca Shoals/ Jamison Adele-1 19–59 bbls/MMscf
Caswell Gwydion
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Gas/Condensate and Oil Families Browse Basin Oil/Condensate Families
Plover
Echuca Shoals
Edwards and Zumberge, 2005 Boreham et al, 1997, AGSO Record, 1997/57 Blevin et al., 1988, BBHR Study
Gas & Condensate Families; Plover-sourced
E-M Jurassic
Westralian 1 PS Plover-sourced Dry gas Biodegraded on Yampi Shelf Edwards et al, 2006 AAPG
Plover-Sourced Gas/Condensates
Plover-reservoirs
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Torosa, Brecknock and Calliance Caswell SB Plover
N Scott Reef, Scott Reef/Torosa Brecknock
Barcoo SB Plover + ?Vulcan Source
Brecknock South/ Calliance
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Ichthys Gas & Condensate; Plover/Vulcan sourced
Westralian 1+2 PS Caswell Sub-basin Vulcan-sourced wet gas Plover-sourced Dry gas E-M Jurassic Edwards et al, 2006 AAPG
Plover and Vulcan-Sourced Gas/Condensates
Plover-reservoir Ichthys-reservoir
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Ichthys Accumulation
Plover Fm Brewster Mbr Vulcan Fm
Le Poidevin et al, 2015 Browse APA Kuske et al., 2015, APPEA poster RIU Good Oil Conference, Freemantle, 2–3 September 2015
Crux Gas/Condensate; Plover/Vulcan-Sourced
Westralian 1+2 PS Heywood Graben Plover & Vulcansourced gas
E-M Jurassic Edwards et al, 2006 AAPG
Crux Gas/Condensate
Plover-reservoir
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Heywood Graben Structural Study • Merged airborne and shiptrack magnetic data used to better define the VulcanBrowse Basin transition • Refine extent of prospective Heywood Graben • Delineation of structural trends will allow better understanding of hydrocarbon migration
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Heywood Graben Tbase Kcamp l
Kcamp u Ktur
Kmas
Kapt Kbar Kval Kbase
Heywood Graben
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Early Cretaceous-Sourced Oil and Gas Westralian 3 PS Early Cretaceous Echuca Shoalssourced oil and gas
E-M Jurassic Edwards et al, 2006 AAPG
Browse Basin Petroleum Systems Westralian 3 Westralian 1 + 2 Heywood Graben
Plover-reservoir Brewster/Ichthys-reservoir
Westralian 1 + 2 Caswell Sub-basin Westralian 1
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Valanginian to Barremian Palaeogeography K20 Sequence (lower Echuca Shoals)
Basin floor; mud
Slope; silt/mud
K30 Sequence (upper Echuca Shoals)
Fluvial-shelf; mud
Fluvial-shelf; sand
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Conclusions: 4 Mesozoic Petroleum Systems Oil
Westralian 3 PS Early Cretaceous Echuca Shoals Oil & gas Westralian 1+2 PS Jurassic Plover + Vulcan (thick) Variable gas
Wet Westralian 1+2 PS
Modified Modifiedfrom from Barrett, Barrett,2004 2004 Kennard et al., 2004 Kennard et al., 2004 le Poidevin et al., 2015 le Poidevin et al., 2015 Kuske et al., 2015 Kuske et al., 2015
Jurassic Plover + Vulcan Wet gas
Dry Westralian 1 PS
Early – Middle Jurassic Plover, Dry gas
RIU Good Oil Conference, Freemantle, 2–3 September 2015
Thank you Resources Division
[email protected]
Any questions?
