How do the optical properties of natural materials influence the accuracy and reliability of photogrammetry-derived topographic reconstructions? Here we quantify the effects of material composition, color, and grain size on digital photogrammetry reconstructions in the laboratory. Static experiments show that low-reflectivity granular materials (e.g., sand, pumice, and aluminum oxide) yield relatively reliable photogrammetry data for a wide range of grain sizes. Reflective materials (e.g., glass beads, wet clay) yield less reliable results but dusting wet clay surfaces with low-reflectivity granular materials improves reconstructions, with higher grain densities typically yielding lower errors. For deformed clay models, photogrammetric results tend to improve at higher extension magnitudes because of fault and associated texture development on model surfaces. These results have implications for the reliability of photogrammetry data in both field and laboratory settings and are particularly relevant for analog modelers seeking to improve the precision of their photogrammetry-derived topographic reconstructions. For more details, see our new open-access paper in Earth and Space Science: https://lnkd.in/gaJrfZX5
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SwRI Structural Geology and Geomechanics services help oil and gas clients to better understand the complex interplay between mechanical stratigraphy, natural deformation, and subsurface stress conditions. Our research, consulting, and training services are beneficial for oil and gas exploration, mining, and construction and civil engineering applications.
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- 1947
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Our new paper titled “Evidence for regional fluid migration in the Eagle Ford Formation, Austin Chalk, and Buda Limestone of south-central and west Texas, USA.” is now out in Marine and Petroleum Geology. Full reference: Evans, M.A., Ferrill, D.A., Smart, K.J., 2024.?Evidence for regional fluid migration in the Eagle Ford Formation, Austin Chalk, and Buda Limestone of south-central and west Texas, USA.?Marine and Petroleum Geology, 106896, https://lnkd.in/g7e9MSNA .?
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Mesostructures in subhorizontal thinly bedded calcareous mudstones of the Permian Bell Canyon Formation in the western Delaware Basin (west Texas) include vertical tectonic stylolites that are kinematically linked with low-angle thrust faults.?Schmidt rebound is high for all but a few beds, indicating generally competent rock.?Competent beds exhibit contrasting deformation behavior ranging from (i) no visible tectonic stylolites and numerous small-displacement (<1 cm) thrust faults, to (ii) tectonic stylolites with rare thrust faults.?Tectonic stylolites are abundant in beds with 3.5-6.5% clay minerals, and absent from beds with more or less clay.?Less competent beds are more clay-rich, and exhibit ductile flowage or internal folding rather than stylolite formation, and tend to terminate small-displacement thrust faults in adjacent beds.?These results demonstrate that deformation behavior in otherwise similar calcareous mudstone is extremely sensitive to subtle changes in mineralogy. Check out the full paper: Ferrill, D.A., Cawood, A.J., Evans, M.A., Smart, K.J., King, R.R., Zanoni, G., 2024.?Thrust v. stylolite.?Journal of Structural Geology, 105113, https://lnkd.in/gkUTgAsG
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