Bureau of Economic Geology, The University of Texas at Austin (www.beg.utexas.edu).
AAPG Annual Convention, Calgary, Alberta, Canada, June 19–22, 2005
Ordovician Karst Mapping with Hyperspectral and LIDAR Data
The Franklin Mountains in El Paso,
Texas, expose a world-class Ordovician paleocave system. Recent mapping
of this system using tripod-mounted lidar, GPS, DEM data, and hyperspectral
satellite imagery has revealed mappable spectral patterns that allow us
to better understand the paleocave development, collapse, and dolomitization
in three dimensions.
Recent work in the Mesozoic of Utah suggests that off-nadir summer acquisitions will be useful in this and other areas of steep topography.
Ground-truth spectral acquisition during satellite overpasses also improves overall classification accuracy. Extensive averaging of training spectra maximizes the signal-to-noise ratio of the training spectra. These practices maximize the effectiveness of full-range hyperspectral facies mapping for hydrocarbon-exploration-model development. The result is a new paradigm for three-dimensional, quantitative, hybrid hyperspectral/topographic facies analysis that leverages rock-reflectance spectra invisible to the human eye.