Hochstetter-1 Tane-1 Matuku-1Taranui-1 Maui-7 Maui-1 West

OMV New Zealand Limited

Alexander Wunderlich and Callum Kennedy


New Plymouth, 22nd of March, 2017

Hochstetter-1 Tane-1 Maui-1 Maui-7 Taranui-1 Matuku-1

Amokura-1

Kopuwai-1

Taranga-1

West Cape-1

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2

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OMV New Zealand Limited - The 2017 New Zealand Petroleum Conference - March 2017

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Agenda

OMV New Zealand Limited - The 2017 New Zealand Petroleum Conference - March 2017 3

Scope

Location and stratigraphy

Regional development of the Southern Taranaki Basin

Syn-Rift Stratigraphy and Evolution

Sequence stratigraphic units and sediment partitioning

Syn-Rift Architecture

Subsidence Analysis of wells in hanging-walls

Evolution of syn-rift normal faults

Sequential Dip-Slip Movement

Multi-phase rifts versus accommodation space development

Conclusions

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Location


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Stratigraphy


North Cape Formation

Rakopi Formation

Wainui Formation

Schematic Generalized Stratigraphy, Southern Taranaki, New Zealand

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Regional Development


The elongated sub-basin architecture and bottle-necks:

Amplified tidal currents

Dampened wave-action

Prevented any longshore drift as one possible sediment-supply mechanism

Thick Upper Cretaceous package

Thin/absent Upper Cretaceous package

Area of interest

MH: Maui High HKH: Hector-Kiwa High TR: Tasman Ridge AQ: Aquitaine Ridge MSB: Maui Sub-basin KT: Kahurangi Trough KS: Kiwa Sub-basin CS: Cook Sub-basin TT: Tane Trough TAT: Taranga Trough MS: Moa Swell NRA: Northern Rift Area

From Uruski 2015

MH

TR

HKW AQ

MSB KT KS

CS

TT TAT

MS

NRA

50km

Distal: Open Marine

Proximal: Coastal and Fluvial

Cretaceous Isopach Map

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Regional Development – Syn-Rift Stratigraphy and Evolution


T

T R

R 2

nd o

rder

TR

cycle

s

2nd o

rder

TR

cycle

s

Fining & Coarsening Cycles

Fining & Coarsening

Cycles MFS@66Ma

MFS@71-72Ma

MRS@~81Ma

MRS@~69Ma

BASEMENT

Tane-1

GR/SP DEN/NEU DINO % LITH.

Matuku-1

GR/SP DEN/NEU LITH. DINO %

Maximum Flooding Surface

Maximum Regressive Surface

Transgression

Regression

MFS

MRS

T

R

NE SW 75km

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Regional Development - Sequence stratigraphic units


Se

qu

en

ce

1

Se

qu

en

ce

2

I. Early rift stage

IV. Early rift stage

II. Main rift stage

III. Transition rift stage

V. Main rift stage

VI. Late rift stage

Tane-1 Takapou-1 Kiwi-1 Matuku-1 Pukeko-1 Maui-4 North Tasman-1

NE S

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Multi-phase rifts versus accommodation space development Small to large scale development


Te Whatu Area

Western Platform

Southern and Central Taranaki Basin

C

B

A

Matuku-1

Maui-4

Tane-1

A

B

C

Cretaceous Isopach Map

Thick

Thin

|

Multi-phase rifts versus accommodation space development Local perspective – Western Platform focus


Sequence 1

Initial Rift Stage – Low Accommodation System Tract

Scattered local depocentres.

Asymmetrical stratal units.

Potential erosion, starvation or low deposition-rates at footwall crests.

Sediment supply higher than rate of accommodation

low preservability of organic deposits; incised-valley-fill type of stratigraphic architecture dominated by multi-storey channel fills and a general lack of floodplain deposits.

N

5 km

Thick

Thin

Isopach Map

Te Whatu-2

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Sequence 1

Main Rift Stage – High Accommodation System Tract

Enhanced stratal thickness development in hanging-wall and stratal wedge-shaped units toward the footwall crest.

Development of footwall islands with erosion of elevated areas.

Hanging-wall dip-slope delta

Fault tip delta

Foot-wall sourced delta

Breaching of relay ramps and fault linkage.

Smooth, elongate hanging wall depocentres.

N

5 km

Thick

Thin

Isopach Map

Te Whatu-2

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Sequence 2

Early Rift Stage – Low Accommodation System Tract

Tectonic quiescence, no dip slip movement along major faults.

Minor differential compaction possible.

Partly infilled half-grabens are regressed by mainly fluvial and coastal plain deposits.

No scattered depocentres, as faults are linked already.

N

5 km

Thick

Thin

Isopach Map

Te Whatu-2

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Sequence 2

Main Rift Stage – High Accommodation System Tract

Renewed extension favor the reactivation of previously established through-going fault zones.

All displacement immediately accumulates on few major faults which ensures high rates of footwall uplift and possible fault block rotation.

Footwall escarpment erosion.

Reactivation of smooth, elongate hanging wall depocentres.

N

5 km

Thick

Thin

Isopach Map

Te Whatu-2

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Cretaceous Subsidence and Displacement Analysis


Matuku-1 Depocentre

Tane-1 Depocentre

Maui-4 Depocentre

*

* Decompacted Values

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Matuku-1 Depocentre

Tane-1 Depocentre

Maui-4 Depocentre

*


MRS MFS MFS MRS

Sequence 1 – First Rift Phase Seq 2 – Second Rift Phase

Early R Stage Main Rift Stage Initial Main Rift Stage

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Matuku-1 Depocentre

Tane-1 Depocentre

Maui-4 Depocentre

*


MRS MFS MFS MRS

Sequence 1 – First Rift Phase Seq 2 – Second Rift Phase

Early R Stage Main Rift Stage Initial Main Rift Stage

Te Whatu Fault

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Multi-phase rifts versus accommodation space development Western platform reservoir architecture prediction


Initial Rift Stage – Low Accommodation System Tract (ca. 83 Ma)

Thick

Thin

Hochstetter-1

Kiwi-1

Matuku-1

Pukeko-1 Hector-1 Kiwa-1

Te Whatu-2

Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

Fluvial Plain - Highlands

Fluvial Plain - Lowlands

penetrated by well

not penetrated

Sediment Routes

Alluvial Fans/Fan Deltas

N

N

Isopach Map

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Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

Thick

Thin

Main Rift Stage – High Accommodation System Tract (ca. 75 Ma)

penetrated by well

not penetrated

Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

Coastal Plain

Trangressive Shallow and Marginal Marine

Sediment Routes


N

N

Isopach Map

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Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

Thick

Thin

penetrated by well

not penetrated

Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

Early Rift Stage – Low Accommodation System Tract (ca. 70 Ma) Fluvial Plain - Highlands

Sediment Routes

N

N

Isopach Map

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Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

Thick

Thin

penetrated by well

not penetrated

Main Rift Stage – High Accommodation System Tract (ca. 69 Ma) Coastal Plain

Trangressive Shallow and Marginal Marine

Sediment Routes


Hochstetter-1

Kiwi-1

Matuku-1


Te Whatu-2

N

N

Isopach Map

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Multi-phase rifts versus accommodation space development Regional perspective – shift of rift axis


82Ma 72Ma 66Ma 69Ma

Regressive-Transgressive Sequence 1 – First Rift Phase Regressive-Transgressive Sequence 2 – Second Rift Phase

Initial Rift Stage Main Rift Stage Early Rift Stage Main Rift Stage

Thick

Thin

N N N N

Matuku-1

Maui-4

Matuku-1

Maui-4

Matuku-1

Maui-4

Matuku-1

Maui-4

Tane-1 Tane-1 Tane-1 Tane-1

50 km 50 km 50 km 50 km

Isopach Map Isopach Map Isopach Map Isopach Map

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Implications on reservoir distribution


Kiwa Sub-basin Pakawau Sub-basin Maui Sub-basin

Kiwa-1 Matuku-1 Maui-4 North Tasman-1 Pukeko-1 Cretaceous

hanging-wall dip slope sedimentation, with erosion on the footwall

condensed sedimentation on intra-basin highs and low energy environment form muddy supratidal environments

Vsh < 40%

very high energy environments form subtidal and intertidal very good quality reservoirs

Basement

Sequence1

From Google Earth From Google Earth

Sequence2

NW S

Poor to Moderate Reservoir Quality

Good Reservoir Quality

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Conclusions


The Pakawau Group consists of various formations encompassing:

coarsening- and fining-upward multi-storey and scattered fluvial sandstones, coals and coaly mudstones in coastal- and fluvial-plain environments (Rakopi Formation and Wainui Formation), and

mainly fining-upwards units with transgressive shallow- to marginal-marine sandy sub-environments (North Cape Formation) interpreted to infill a large estuarine embayment complex.

The Pakawau Group has an aggradational to retrogradational stacking pattern caused by opening and drowning of the Maui, Kahurangi and Cook sub-basins, due to sequential dip-slip movement along selective reactivated fault sets.

Sediments deposited during the intervening periods with relative tectonic quiescence, differ from the typical post- or pre-rift syn-rift nomenclature.

Integration of structural styles and subsidence analysis derived from well-constrained seismic interpretation enables a unified model to be proposed.

Dip-slip extension predominated throughout the rifting episodes and normal faults were active sequentially not synchronously during the Cretaceous rift system of the Southern Taranaki Basin.


Hochstetter-1 Tane-1 Maui-1 Maui-7 Taranui-1 Matuku-1

Amokura-1

Kopuwa-1

Taranga-1

West Cape-1

Thank you very much!

Alexander Wunderlich and Callum Kennedy


New Plymouth, 22nd of March, 2017

Documents

Hochstetter-1 Tane-1 Matuku-1Taranui-1 Maui-7 Maui-1 West