AEM for Leigh Creek-Marree Structural Mapping

Tania Wilson (Geological Survey of SA) and

Ian Roach (Geoscience Australia)

AEM Survey Location

QUESTION…In a deformed geological environment, can AEM detect accurate structural data?

ANSWER…Yes

DISCLAIMER…

Approach with CAUTION!

AEM Survey Location

• Focused on the NW corner of the AEM survey area.

• Outcropping Neoproterozoic basement.

• Late Triassic Leigh Creek Coal Measures.

AEM Survey Data

SBS 400m

LBL 400m

Depth Slices

Elevation Slices

Depth of Investigation

Conductance

Regional Scale FaultsGoCAD t Surfaces5km line spacingx10 V.E.

Bedding

Georeferenced jpegs5km line spacingx7.5 V.E.

Data Artefacts

Georeferenced jpegs5km line spacingx7.5 V.E.

Witchelina DiapirGoCAD t Surfaces5km line spacingx10 V.E.

Witchelina Diapir

Georeferenced jpegs5km line spacingx7.5 V.E.

Skillogalee Dolomite

Georeferenced jpegs5km line spacingx7.5 V.E.

Tapley Hill FormationGoCAD t Surfaces5km line spacingx10 V.E.

Leigh Creek Coal Measures

5-10m Depth Slice

Conclusions

• Regional scale faults.

• Bedding.

• Potential to detect facies variations.

•3D mapping of diapirs.

•Potential for target generation.