falcon agg inversion to constrain 3d geological models in the … · 2017. 6. 23. · falcon® agg...
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FALCON® AGG inversion to constrain 3D
geological models in the Glyde Sub-Basin,
Northern Territory
Peter Kovac1, Luke Titus2, Carlos Cevallos3, Josh Bluett2, Fabio Vergara3
1 CGG GravMag Solutions, 6100 Hillcroft, Houston, TX 77081 2 Armour Energy Ltd, Level 27, 111 Eagle Street, Brisbane, QLD 4000 3 CGG Aviation (Australia) Pty Ltd, 69 Outram Street, West Perth, WA 6005
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Outline
Introduction
Geological Setting
Data and data processing
Structural interpretation
Earth Model and inversion
Conclusions
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Introduction
How can we improve our geological models using inversions?
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…inversions are just one step in the geological interpretation of geophysical data
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Introduction
Armour Energy
Acquisition
Integrated interpretation (Airborne
AGG and Mag, seismic, geology,
public domain datasets)
Goal: identify hydrocarbon plays in
the Glyde Basin
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Successful drilling!
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ASX Announcement, 23rd October 2013
ASX Announcement, 13th November 2013
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Geological setting
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Geological Setting - Regional
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Geological Setting - Regional
Rawlings (2002)
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Armour Energy exploration blocks
in the Glyde Sub-basin
Geological Setting – Glyde Sub-basin
McArthur Group: up to 4.5 km; carbonates,
sandstone, fine-grained clastics and minor
tuffaceous mudstone
Depositional environments: fluvial and
lacustrine to shallow marginal marine
Intracratonic setting
Oldest rocks: Palaeoproterozoic volcano-
sedimentary sequence of the Tawallah Group
Basement: Scrutton volcanics – correlated to
Cliffdale Volcanics and Nicholson Granite
emplaced at about 1860 – 1845 Ma
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Data and data processing
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Data – GDD, Mag
11 GDD TMI AS
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Data – gD
12 gD
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Data processing
Image enhancement of the AGG and magnetic data
Shape Index of equipotential surface of the gravity field to understand nature of AGG and its
relation to geometries of geological bodies (Cevallos, 2013)
Pseudo depth slices of the GDD, the Shape Index and magnetic data to constrain the vertical
distribution of geological units (Spector and Grant, 1970)
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GDD 1020m gD HD SI 1020m
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Structural interpretation
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Integrated structural interpretation
Structural interpretation and GDD
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Complex structural evolution
Regional size ‘pop up’ structure in the
north, represented by a pattern of
reverse, transpressional and strike-slip
faults, and abundant synclines and
anticlines
In the south, the transtensional Emu
Fault Zone controlled development of
several regularly oriented, fault
bounded depocentres (Glyde)
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Earth Model
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2D forward modelling
Fault network and magnetic basement
3D model (surfaces)
3D model (grid)
Inversion
Earth Model
5 0
00 m
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Geological cross-section A – A’
A) Pseudodepth slice of 1020m of first vertical derivative of vertical component of gravity (GDD) response (measured – black;
calculated – blue); B) Vertical gravity (gD) response (measured – black; calculated – blue)
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A
B
2D modelling
GDD
[Eo]
gD
[mGal]
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Earth Model – Fault network
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Earth Model – Depth to magnetic basement
Gridded Euler contact (Structural Index = 0)
magnetic solutions at 15% error level
Interpreted top surface of the magnetic basement
(Tawallah Group, Scrutton volcanics)
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Earth Model - Stratigraphy
Geological model constructed from interpreted geological interfaces and faults
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Earth Model - Voxet
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Barney Creek Fm + younger sequences Teena and Coxco Dolomite Layer Lower Umbolooga Subgroup
Basement (Tawallah Gr., Scrutton volcanics)
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Earth Model - Voxet
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Earth Model - Inversion
Coxco and Teena Dolomites - geological interpretation
-0.2 1
Coxco and Teena Dolomites - Heterogeneous density inversion results
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Earth Model - Inversion
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Glyde_GZZ_obs
Glyde GZZ resid
Glyde_GZZ_cal
-2 E 2 E 0
Validity of the proposed geological model was evaluated by inverting of gravity gradiometer data
Inversion indicated quantitative consistency between geological and geophysical data
-30 E 30 E
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Final Earth Model
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Barney Creek Fm and younger
sequences
Teena and Coxco Dolomite Layer
Lower Umbolooga Subgroup
Basement (Tawallah Gr., Scrutton volc.)
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Conclusions
The interpretation and 3D modelling workflow applied in the Glyde Sub-basin
project represents a solid approach to integrate available geological and geophysical
data in a comprehensive 3D interpretation
3D inversions proved valuable to refine the final model and as a quantitative tool to
assess model reliability
When integrated with a solid geological understanding, 3D inversions represent an
additional tool for the geologists and the geophysicist to aid interpretation and
improve 3D geological models
High-resolution airborne gravity gradiometer and magnetic survey effectively
images tectonic pattern to aid in minerals and hydrocarbon prospecting
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Thank you!