Prediction of Stratigraphy at Hummocky Hills

Fault Block (HH #1).

Sources, reservoirs and seals are predicted from field and laboratory

work. All thicknesses are approximate and are based on preliminary

seismic data interpretation or extrapolation from fieldwork.

Geology of the Tasmania Basin and location of drill site on Hummocky Hills Fault Block.

Potential development of the Gondwananpetroleum system in the Tasmania Basin. Major and minor potential source, reservoirand seal facies are indicated, along with

timing of trap formation and source maturity.Source rocks are marked in the Woody

Island Formation and Liffey Group, reservoirin the Liffey Group, and seals in the Cascadeand Ferntree Formation and Jurassic dolerite.

Great South Land Minerals

Hummocky Hills

Fault Block

(HH #1) May 2008

Compiled by Dr. Zohreh AminiArea onshore Tasmania

Special Exploration Licence 13/98

Petroleum System Characteristics of the Hummocky Hills Half Graben (based on seismic line TB01- PG )

Target: Triassic, Early to Late Permian

Source: Unit 1, Liffey Group, Macrae Mudstone, Quamby Mudstone, Tasmanite Oil Shale

Reservoir: Unit 2 (Triassic ), unit 1, Palmer Sandstone, Garcia Sandstone, Liffey Group (Permian)

Depth to top of reservoir: Unit 2 = 510 m, Unit 1 =~710 m, Palmer Sandstone=~ 810 m, Garcia Sandstone=~ 860 m, Liffey Group=~960 m. Seal: Jurassic Dolerite

Trap: Half Graben

Risk: Timing, maturation and migration in the Mid-Jurassic to the Cretaceous - traps were formed in the early Cenozoic. Burial in the Cenozoic, plus an elevated geothermal gradient may result in generation of late hydrocarbons.

*

HH #1

HH#1 Drill Site

Gravity Map (Residual Bouguer Anomaly) of the Hummocky Hills Fault Block (HH#1)

Geology map of the Hummocky Hills Fault Block and location of proposed drill site.

Permo- Triassic

Ordovician -Devonian

Total

(P90) 8 - 8 (P50) 16 - 16 (P10) 30 - 30

Monte – Carlo simulations of potential, undiscovered petroleum at Hummocky Hills # 1 i in million barrels.

Topographic map of the Hummocky Hills Fault Block (HH#1)

HH #1

Depth(m) Lithology Age Sequence Lithological Description

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

Unit 1: Carbonaceous, micaceous, quartz sandstone and coal measures. (source and reservoir) U

pper

Par

mee

ner S

uper

grou

p U

pper

Fre

shw

ater

Seq

uenc

e

Bogan Gap Group (30 – 180 m): Mudstone & siltstone. (seal) Palmer Sandstone: Thin layer of pebbly sandstone. (reservoir) Springmount Mudstone. Garcia Sandstone: Coarse-grained pebbly sandstone.(reservoir)

Dolerite (diabase). (seal)

Sand, gravel and mud of alluvial and lacustrine origin.

Minor Unconformity

Coarse Sandstone

Precambrian?: deformed siliciclastics Disconformity

Stockers Tillite (~ 180 m): Glacial, lithified boulder clay, arkosic sandstone and conglomerate.

Quamby Mudstone (~ 260 m): Dark massive-bedded pyritic mudstone, carbonaceous siltstone and abundant glendonites and rare marine fossils. (source) Tasmanite oil shale (~2 m). (source)

Hornfels Contact Metamorphism

Poatina Group: Calcareous fossiliferous siltstone & sandstone. Liffey Group: Sandstone, siltstone & mudstone. (reservoir) Mudstone with some coal measures. (source) Macrae Mudstone: Mudstone, siltstone&carbonaceous rocks. (source) Golden Valley Group (0 - 135 m): Richly fossiliferous siltstone & sandstone and mudstone with some lonestone.

Prot

- E.

Pal.?

Q

Jura

ssic

La

te P

erm

ian

Late

Car

boni

ferr

ous -

Ear

ly P

erm

ian

L

ower

Par

mee

ner S

uper

grou

p Lo

wer

Mar

ine

Sequ

ence

LF

S U

pper

F.S

.

? Unit 3 (0-80 m): Quartz rich sandstone, lithic sandstone, lutite and coal. Unit 2 (0-200 m): Sequences of well-sorted quartz sandstone, feldspathic sandstone and lutite sandstone. (reservoir) Basal Conglomerate?

Tria

ssic

Seismic line TB01-PG with structural and stratigraphic interpretations

Base of dolerite

Proposed drill site for HH #1 519 784 mE, 5 383 887 mN

Between Shot points 975 and 1275 the Jurassic Dolerite and Tasmania basin sectioncomprise a single tilted block.

Seismic line TB01-PG without interpretations

-0.20

0.40

0.60

0.80

0.00

0.10

0.20

Offset:SP:

SP:

-0.20

0.00

0.40

0.60

0.80

0.10

0.20

Offset:

2.5 Km0

Base Parmeener Unconformity Horizon

Cenozoic Sequence