
TY  - JOUR
A1  - O'Callaghan, E.J. 
T1  - 3-D visualisation of transpressional structures in the eastern Otway Basin
JF  - Exploration Geophysics
JO  - Explor. Geophys.
Y1  - 1993
VL  - 24
IS  - 4
SP  - 743
EP  - 750
KW  - 
UR  - https://doi.org/10.1071/EG993743 
N2  - The application of new technology and concepts to exploration in the eastern offshore area of the Otway Basin has recently resulted in two gas/condensate discoveries. Exploration for hydrocarbons in BHP Petroleum's permits VIC/P30 and VIC/P31 began in 1991. Geotechnical studies conducted by BHPP during the gazettal phase of the VIC/P31 acreage indicated the presence of a previously unrecognised compressional structural setting. A 2-D seismic grid was shot over this area which confirmed these concerns. The area displays extreme structural complexity, due to a history of reactivation closely linked to localised episodic compression and regional extension. The "Eric The Red" anticlinal structure is a product of these forces and was drilled unsuccessfully for hydrocarbons in early 1993. Accurately resolving the complex three-dimensional structural problem in the Eric The Red area with 2-D seismic data on Landmark presented major difficulties. In the ideal case, the most structurally plausible model would be generated with a three dimensional interpretation of the 2-D seismic. Through BHP Research, state-of-the-art 3-D computer visualisation technology was employed to assist in interpretation. Visualisation of 2-D seismic data in 3-D is not known to have been previously attempted with this technology. Mapped time surfaces and fault planes from the original Landmark/Zycor interpretation were sliced through the 3-D volume as part of the visualisation exercise. The "VoxelGeo" software utilised has the added capability of rendering the data volume transparent up to a specified amplitude threshold. This enabled detailed examination of zones and surfaces of interest. The 3-D visualisation concept is currently at the forefront of developments in computer-based geophysical interpretation. In addition to seismic amplitude data other attributes, such as phase, instantaneous frequency and velocity, are available for the 3-D imaging of seismic data. 
ER  -

