Seismic Attribute Analysis and Determination of Reservoir

Architecture of Miocene sands in Maari Field Area

Monmoyuri Sarma, Glenn Thrasher, Karsten Kroeger, Paul Viskovic

NZ Petroleum Geoscience Workshop, 22–23 September, 2016, Lower Hutt

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)

Paradigm Geophysical Ltd.

Acknowledgement

Objective

• To understand the structure and the stratigraphy of the area of interest.

• A secondary aim of the project is to develop an understanding of the lateral variation in facies and carrier bed geometries

Location and Available Data

PR Number

Entitlement Survey

PR 2598 Public Maari 3D

PR 3757 Public Maari 3D + PSDM

PR 4140 Public Maari 3D

PR 4193 Public Maari 3D Inversion

PR Public Matariki 3D

PR Confidential Maari-Matariki merge

Confidential Kaka

Well Data :Kea-1, Moki-1, Maari1/1A, Maari-2, Maui-4

Core Photos :Moki-1, Maari1/1A, Maari-2, Maui-4

Area of Interest

Methodology- Interpretation

seabed

N75

N60N50

N40

N35

MS

N15P50P22P10

P00

K96

basement

N82

Seismic Well tie Fault Interpretation

Horizon InterpretationAutopick / Gridding

Manual Picks

Auto Picks

N

N

Methodology- Attribute Analysis

Surface Attribute Analysis

Volume Attribute Analysis

Procedure followed1. RMS amplitude extraction in

horizon and slices.2. RMS balanced on either side of the

fault.3. Volume attribute creation4. Volume cropped and flattened on

desired horizon5. Volume blending6. Changing blending parameters to

obtain best representative view7. Volume rendering with opacity

1467 timeslice at N35 Flattened and blended semblance and amplitude

N

RGB Blended spectraldecompositionvolume

Study Intervals

N40

MS

N34

N15

P50

N40

MS

N34

interval

Balanced RMS amplitude extracted 0-50ms below N35

Moki Interval

12

1

2

The time section and the x line indicate smaller channelized features

The bright reflector indicate the paleocontactN35

MS

N35

MS

N35

MS

Upper Part of Moki Formation

Facies Map 0-50ms below N35

Facies Zones1467 timeslice at N35 Flattened and blended frequency

Horizon slices from N35 downwards

Massive Moki sandstone unit in Maari well with some mud clasts and shale laminae

Core 2, 1326-1327, Maari-1

Core 1, 1307-1308, Maari-1

Core 2, 1329-1330, Maari-1

Upper part of Moki Interval

Well data

MS

N35

N35

MS

Maui-4Kea-1 Moki-1

N35

MS

Results: Structural FrameworkVideo-1

Results: Facies Model

Video-2

Conclusions and Future Directions

1. Reservoir Architecture of Miocene units were recognized using mainly seismic patterns and with input from relevant wells and cores.

2. Helped in Understanding the distribution of these facies in 3D and in creation of facies maps.

Output will be used 1. To construct Petroleum Systems Model - the source to reservoir migration of

Petroleum in Taranaki Basin.2. Structural reconstruction of the basin.3. Geocellular Modelling in finer scale.