Fault analysis of reservoir intervals in the Maui Field … · NZ Petroleum Geoscience workshop, 28- 29 September 2017. GNS Science. Introduction. Initial investigations for the development

Fault analysis of reservoir intervals in the Maui FieldNew Zealand Petroleum Geoscience Workshop September 2017

Hannu Seebeck Glenn ThrasherSusanna Willan

WaikawauNormal fault ~30 m disp.Mid Miocene siltstones

GNS ScienceNZ Petroleum Geoscience workshop, 28-29 September 2017

IntroductionInitial investigations for the development of

the Maui structure

Iteration 1 Structural Model19 horizons mapped and gridded at

500 m x 500 m resolution

13 proportional slices representing key intervals gridded at 500 x 500 m

Seamless fault and horizon model

Triangulated-surface model calculated at500 m x 500 m resolution

Depth converted Isopach Maui16Seafloor-Top Mangahewa0 MaRed = thickBlue = thin

Iteration 1

Iteration 2


Isopach 4DTM. Miocene –Top Mangahewa11 MaRed = thickBlue = thin

Isopach 4DTL. Miocene –Top Mangahewa7.2-5.3 MaRed = thickBlue = thin


IsopachL. Miocene-Top Mangahewa7.2-5.3 Ma

IsopachMiocene foreset-Top Mangahewa9 Ma

Isopach Iteration 1M. Miocene-Top Mangahewa11 Ma


Hypothesis

How has uplift under the shelf been accommodated?

Why is this important?Any hydrocarbons migrating from the

East Maui Basin at this time were potentially flowing through this structure

towards the north

IsopachL. Miocene-Top Mangahewa

7.2-5.3 Ma

Shelf Break

Shelf Break

Thinning under shelf

Thinning under slope

Uplift

Possibility of significant L. Miocene compressional folding

IL Seismic sectionPGS Megasurvey



7.2-5.3 Ma

PGS MegasurveySeismic amplitude TWTT

2

3Seconds

Two-way travel time

2 km



7.2-5.3 Ma

PGS MegasurveySeismic amplitude TWTT3D triangular surface model500 x 500 m

3D model

3

2

1

SecondsTwo-way

travel time

4 km


Fault analysisMOVE™ 2017.2 Midland Valley

Fault displacement profile along sectioned fault

3D Fault triangulated surfaces with displacement magnitudeMax. displacement 110 m red arrow

Max. displacement

Max. displacement


Decompaction + fault restoration to M. Miocene (~11 Ma)

Restoration of elliptical fault displacement (3-3.6 Ma)

Fault restoration + decompactionMOVE™ 2017.2 Midland Valley

Elliptical fault displacement Forward model

Structural model


Summary and next stepsFaults bounding Maui reservoirs result from reversal of regional strain from compression to extension resulting in collapse of incipient folding across Maui high

Low angle basement fault(s) reverse motion initiated folding in cover sequence

Reactivation and/or development of basement faults important for late stage normal fault nucleation trends

Different restoration strategies influence tectonic interpretation

Upon completion of Iteration 2 model build:

Restoration of Cape Egmont and Maari faults

Erosion estimates

3D decompaction

WaikawauNormal fault 2 m disp.Mid Miocene siltstones


Acknowledgements

Andy Nicol (UC)John Walsh (UCD)

This project is funded by the Ministry of Business, Innovation and Employment through the GNS Science-led research programme on New Zealand petroleum source rocks, fluids, and plumbing systems (contract C05X1507)

For further information please contact:[email protected]

3D fault surfaces Mid Miocene siltstones

mailto:[email protected]

Fault analysis of reservoir intervals in the Maui Field … · NZ Petroleum Geoscience workshop, 28- 29 September 2017. GNS Science. Introduction. Initial investigations for the development

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