2D STRATIGRAPHIC ANALYSIS FROM DOM USING SPATIAL TECHNIQUES
We present two case studies that combine spatial and geologic techniques to efficiently produce stratigraphic and structural data on new exposures on a highway in northern Colombia (Lower Magdalena basin): turbidite depositional systems in shallow marine environments of the Paleocene San Cayetano Formation and shallow-marine to deltaic transition recorded in the Oligocene Cienaga de Oro Formation. Both outcrops offer the possibility of quantifying sedimentological, stratigraphic and structural processes on inaccessible exposures.
Area and thickness measurements, proximity, overlay and adjacency analysis, image segmentation, and linear referencing techniques where used along with lithofacial descriptions, photointerpretation and structural descriptions to test an approach to stratigraphic areal analysis. Linear referencing allowed to extract lithofacial information on lines crossing the 2D bodies. The possibility to automatically generate multiple stratigraphic columns provided a means to quantitative analyze changes in thickness and shape, and to produce single segment columns in contrast to field-based descriptions. Additionally, linear referencing and overlay functions were used in computing fracture abundance measurements that account for the effect of areas with patchy debris coverage on fracture detection.