DOC - Offshore Petroleum Exploration Acreage Release 2013

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AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

1

AUSTRALIA

201
3

Offshore
Petroleum

Exploration Acreage Release

RELEASE AREA

V13
-
1
,

EASTERN OTWAY

BASIN
,

VICTORIA


Figure
1

Location of the 2013 Release Areas in the
Eastern Otway basin

HIGHLIGHTS

BIDS CLOSE


21 November

2013



Located within a gas producing region



Access to existing infrastructure
and
growing energy market



Sha
llow to deep water depths, 70

1
030

m



Plays include faulted anticlines and tilted
fault blocks with cross
-
fault seal



Multiple potential oil
-

and gas
-
prone source
rocks and active petroleum systems within
the region



Special Notic
es apply, refer to Guidance
Notes

Release Area V13
-
1 is located partly
with
in
the highly prospective Shipwreck Trough

and extends onto the Prawn
Platform in the
eastern Otway Basin
.

The
Release Area

contains two exploration w
ells, Loch Ard

1 and Eric

the

Red

1.

The Otway Basin is a northwest
-
trending

passive margin rift basin that was formed during Gondwanan break
-
up and the
Antarctic
-
Australian separation. Rift
-
related faulting resulted in the development of large, deep depoc
entres, including the
Voluta and Shipwreck troughs

in the offshore part of the basin
. The Shipwreck Trough is a structural depression between
the Mussel
and Prawn p
latform
s
. Deposition throughout the Late Cretaceous was dominated by deltaic sedimentation
of
the Sherbrook Group
,

which
is

>
5
000

m
thick
in the
t
rough

and
contain
s

most of
the offshore gas discoveries
.
Two

potential
petroleum systems
occur in the depocentre to the west of the

Release Area;
the proven
Lower

Cretaceous
Austral

2 Petroleum System
that
is the source of

the
produced gas

in the region
, and the
Upper

Cretaceous Austral

3
Petroleum System with a potential Turonian oil
-
prone source rock.


AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

2


Figure
2

Structural elements of the Otway Ba
sin showing petroleum fields and discoveries, the location of regional
cross
-
sec
tions and the 2013 Release Area

AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

3


Figure
3

Stratigraphy and hydrocarbon discoveries of the Otway Basin based on the Otway Basin Biozonation and
Stratigraphy Chart 34 (Mantle et al, 2009). Geologic Time Sca
le after Gradstein et al (2012)

AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

4


Figure
4

AGSO seismic line 137/05 across the easternmost Shipwreck Trough and Prawn Platform, Otway Basin.
Location of the line is show
n in
Figure 2
. Mod
ified after O’Brien et al, 2006

AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

5


Figure
5

Regional cross section across the Otway Basin showing position of the present
-
day peak hydrocarbon
generation zone. Location of the line is s
hown in
Figure 2
. Mod
ified after O’Brien et al, 2009

AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

6

PETROLEUM SYSTEMS EL
EMENTS

Eastern Otway B
asin

Sources



Aptian

Albian lower coastal plain and peat swamp

Eumeralla Formation shale and coal (Austral

2)



Upper Cretaceous

lowest Paleogene fluvio
-
deltaic Sherbrook
Group
(Turonian Waarre

Formation

and
Coniacian

Santonian Belfast

Mudstone
) and marginal marine basal Wangerrip
G
roup (Austral

3
unproven

offshore
)

Reservoirs



Upper
Cretaceous
l
ower delta plain and

marginal marine

Waarre and Flaxman formations



Upper
Cretaceous marine Thylacine

Member
,

Belfast Mudstone



Upper Cretaceous
deltaic Paaratte Formation



Paleocene
shallow marine
Pebble Point Formation
Challis Formation and deltaic Nome Formation

Seals

Regional seal



Upper Cretaceous Belfast Mudstone

Intraformational seals



U
ppermost Cretaceous/Paleocene Massacre Shale



Paleocene

Eocene Pember Mudstone and Dilwyn Formation



Eocene Mepunga Formation

Traps



Faulted anticlines, tilted fault blocks with
cross
-
fault seal

INFRASTRUCTURE AND M
ARKETS

The 2013 Release Area
is

proximal to the
Geographe, Thylacine and La Bella

ga
s
fields. The
eastern Otway Basin is an
established gas producing province that services the southeastern Australian energy market
.

The

greater Melbourne
region currently represents

Australia’s largest domestic gas market and is

supported by major petroleum refineries. The

City of Portland is the nearest centre along the western

Victorian coast and i
s
known

for
the

deep

water port

that

was
established for

aluminium

smelting operations

CRITICAL RISKS

The key risk is migration distance and access to hydrocarbon charge from effective source kitchens within the Shipwreck
Trough. F
ault
-
seal integrity
is an issue on the Prawn Platform, partic
ularly as
local structuring
occurred
during the
Turonian
. The presence of sufficiently thick
intraformational and regional sealing lithologies
over good quality reservoirs
is also uncertain.

DATA SETS

For the Wells Data Listing
go t
o


http://www.petroleum
-
acreage.gov.au/2013/support/geo.html

For the Se
ismic Surveys

Listing go to

http://www.ga.gov.au/energy/proj
ects/acreage
-
release
-
and
-
promotion/2013.html#data
-
packages

AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

7

GEOSCIENCE AUSTRALIA

PRODUCTS

Regional Geology and Seismic



Geology and hydrocarbon prospectivity of the deepwater Otway and Sorell basins, offshore southeastern Australia.
Geoscience Australia Reco
rd 2013/
02
.
GEOCAT 74603
.



Time
-
Depth Functions for the Otway Basin
. Geoscience Australia Record 2004/02.

GEOCAT

49566



An Audit of Selected Offshore Petroleum Exploration Wells in the Otway Basin, Southeastern Australia
. Geoscience
Australia Record 2003/21.
GEOCAT

47377



Deep Structure of the Otway Basin, Southeastern Australia, Survey 137 (Phases

1 and 2)
: Post
-
cruise report
.
Australian Geological Survey Organisation Record 1995/18.
GEOCAT

14810



NGMA/PESA Otway Basin Symposium, Melbourne
, 20 April 1994
: Extended Abstracts
. Australian Geological
Survey Organisation Record 1994/14.
GEOCAT

14724



Otway Basin Cross
-
section, SA
, Australian Geological Survey Organisation Record 1992/07.

GEOCAT

14518




Otway Basin
S
eismic
D
ata
, 1992.
GEOCAT

20759



Offshore Otway Basin Study
, 1988.
GEOCAT

20829



Extended abstracts
: Otway Basin Workshop, Canberra, 17 March 1987
, Bureau of Mineral Resources Record
1987/09.
GEOCAT

14137

Stratigraphy



Otway

Basin B
iozonation and
S
tratigraphy

Chart 9


Otway Basin.
GEOCAT

23350



Otway

Basin B
iozonation and
S
tratigraphy

Chart 34


Otway Basin.
GEOCAT 70371



New and Revised Palynological Data for the Otway Basin
, Geoscience Australia Record 2
004/22.
GEOCAT

61366



Otway Basin
-

Biostratigraphic Dataset
, 2001.
GEOCAT 37688

Petroleum Systems and Accumulations



The Oils of Eastern Australia, 2002.
GEOCAT

68754



South
-
eastern Australia Surface Geochemistry II: Light Hydrocarbon Geo
chemistry in Bottom
-
waters of the
Gippsland Basin, Eastern Otway Basin, Torquay Sub
-
b
asin and the Durroon Sub
-
b
asin
. Vols 1 and 2, Australian
Geological Survey Organisation Record 1992/54.
GEOCAT

14562



Australian
P
etroleum
A
ccumulations
R
eport. Otway Basin, South Australia, Victoria and Tasmania
, 1990.
GEOCAT

37053



Preliminary Post
-
cruise Report
:
H
ydrocarbon
Gas G
eochemistry in sediments of the
o
ffshore Otway and Gippsland
Basin
s
: Project 9131.20

Contact Geoscience Australia’s Sales Centre for more information or to order
these reports or products, phone

61 (
0)2 6249 9966, email
sales@ga.gov.au

AUSTRALIA 2013




Offshore Petroleum Exploration
Acreage Release

8

KEY
REFERENCES



BOREHAM, C.J., HOPE, J.M., JACKSON, P., DAVENPORT, R., EARL, K.L., EDWARDS, D.S., LOGAN, G.A. AND
KRASSAY, A.A., 2004

Gas

oil

source correlations in the Otway Basin
, southern Australia. In: Boult, P.J., Johns,
D.R. and Lang, S.C. (eds), Eastern Australasian Basins Symposium II, Petroleum Exploration Society of Australia,
Special Publication, 603

627.



CLIFF, D.C.B., TYE, S.C. AND TAYLOR, R., 2004

The Thylacine and Geo
graphe gas discoveries, offshore
eastern Otway Basin. The APPEA Journal 44(1), 441

462.



GEOLOGICAL SURVEY OF VICTORIA, 1995

The stratigraphy, structure, geophysics and hydrocarbon potential
of the Eastern Otway Basin. Geological Survey of Victoria, Report
103, 241

pp.



GIBSON, G.M., MORSE, M.P., IRELAND, T.R. AND NAYAK, G.K., 2011

Arc
-
continent collision and orogenesis in
western Tasmanides: Insights from reactivated basement structures and formation of an ocean
-
continent transform
boundary off western Tasma
nia. Gondwana Research, 19, 608

627.



GRADSTEIN, F.M., OGG, J.G. SCHMITZ, M.D. AND OGG, G.M. (eds), 2012

The Geologic Time Scale 2012
:

Volumes 1 and 2. Elsevier BV, 1144

pp.



HALL, M. and KEATLEY, J. 2009

Otway Basin, stratigraphic and tectonic framework. Ge
oScience Victoria 3D
Victoria Report 2, Department of Primary Industries.



KRASSAY, A.A., CATHRO, D.L. AND RYAN, D.J., 2004

A regional tectonostratigraphic framework for the Otway
Basin. In: Boult, P.J., Johns, D.R. and Lang, S.C. (eds)
,

Eastern Australasia
n Basins Symposium II, Petroleum
Exploration Society of Australia, Special Publication, 97

116.



LUXTON, C.W., HORAN, S.T., PICKAVANCE, D.L. AND DURHAM, M.S., 1995

The La Bella and Minerva gas
discoveries, offshore Otway Basin. Th
e APEA Journal, 35, 405

417
.



MANTLE
,

D.J., BERNECKER, T., KELMAN, A.P. A
ND PARTRIDGE, A.D., 2009

Otway B
asin, Biozonation and
Stratigraphy, 2009, Chart 34.
Geoscience Australia.



O’BRIEN, G.W., BERNECKER, T., THOMAS, J.H., DRISCOLL, J.P. AND RIKUS, L., 2006

An assessment of the
hydrocarbon prospectivity of Areas VIC/O
-
06(1), VIC/O
-
06(2), VIC/O
-
06(3) and V06
-
1, eastern onshore and offshore
Otway Basin, Victoria, Australia. Victorian Initiative for Minerals and Petroleum Report 90, Department of Primary
Industries.



O’BRIEN
,

G.W., B
OREHAM, C.J., THOMAS, H.J. AND TINGATE, P.R., 2009

Understanding the critical success
factors determining prospectivity

Otway Basin, Victoria. The APPEA Journal, 49
(1)
, 129

170.



PARTRIDGE, A.D., 2001

Revised stratigraphy of the Sherbrook Group, Otway Basin
. In: Hill, K.C. and Bernecker,
T. (e
d
s), Eastern Australian Basins Symposium, A Refocused Energy Perspective for the Future, Petroleum
Exploration Society of Australia, Special Publication, 455

464.