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ABSTRACT: Advances In Use of Image Processing for Data Integration in Basin Studies -- Eastern Otway Basin, Australia -- A Case Study

PETTIFER, G. R., B. A. SIMONS, and A. OLSHINA, Geological Survey of Victoria Department of Manufacturing and Industry Development, Vistoria, Australia

Traditionally basin analysis and exploration prospect studies have relied heavily on seismic and drilling as the main tools for structural and stratigraphic interpretation. The volume of data and interpreted maps from these sources and limitations of existing contour displays creates problems in both effectively visualizing and assimilating the total picture of a basin or prospect. Two-dimensional seismic plan view display techniques have lagged behind advances in seismic acquisition and processing and three-dimensional seismic display technology.

Other datasets such as gravity, magnetics, topography, bathymetry, satellite imagery, airborne radiometrics, velocity maps and surface geological mapping containing structural information which could complement or guide the seismic interpretation, have been either overlooked or only partialIy integrated with seismic and drilling interpretations. Lack of tools to effectively integrate and interpret all geophysical and geological data has been a major impediment to the use of all data in basin studies.

Image processing technology has advanced to the stage where enhanced imaging of two-dimensional and three-dimensional seismic data and integration of all relevant data is now possible. All contoured or spatial (line and/or point) datasets can be gridded to a raster image and maps can be scanned or digitized to raster or vector images for input to an image processor for enhancement, combination, further processing and analysis and interpretation/annotation.

A case study from the Geological Survey of Victoria's Eastern Otway basin study, using ERMAPPER image processing software, illustrates state of the art image processing capability. Enhanced visualization and combined interpretation of two-dimensional seismic (time, velocity, depth), borehole (depth, thickness), gravity (land and marine), magnetics (airborne and marine), topography, bathymetry, surface geological mapping, airborne radiometrics and cultural map data has led to an improved understanding of the structural complexity of the basin.

 

AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)