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
