Modeling uncertainty in the three-dimensional structural deformation and stratigraphic evolution from outcrop data: Implications for submarine channel knickpoint recognition |
| |
| Institution: | 1. Department of Geosciences, Colorado State University, Fort Collins, CO, United States;2. Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, United States;3. Department of Geography and Center for Integrative Geosciences, University of Connecticut, Storrs, CT 06269, United States;4. Institute of Geological Sciences, Freie Universität Berlin, Germany;1. HPO Global Resources Ventures, Colombia;2. Agencia Nacional de Hidrocarburos, Colombia;3. Independent Consultant, Condominio Hacienda San Miguel, Casa 5, Piedecuesta-Santander, Colombia;4. PSL Proanálisis Ltda, Colombia;1. Department of Geosciences, UiT – The Arctic University of Norway, PO Box 6050 Langnes, 9037 Tromsø, Norway;2. Department of Petroleum Engineering, University of Stavanger, 4036 Stavanger, Norway;3. Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, DK-1350 Copenhagen K Denmark;4. Department of Arctic Geology, University Centre in Svalbard, PO Box 156, 9171 Longyearbyen, Norway;5. Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark;1. The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;2. Geological Survey of Israel, 30 Malkhe Israel, Jerusalem 95501, Israel;3. Ratio Oil Exploration, Tel Aviv, Israel;1. Department of Arctic Geology, University Centre in Svalbard (UNIS), PO Box 156, 9171 Longyearbyen, Svalbard, Norway;2. Eni Norge AS, PO Box 101 Forus, 4064 Stavanger, Norway;3. Department of Geosciences, University of Oslo (UiO), PO Box 1047, Blindern 0316, Oslo, Norway;1. KU Leuven, B-3001, Department of Earth and Environmental Sciences, Leuven, Belgium;2. NEXT - Natural and Experimental Tectonics Research Group - Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Italy;3. CNRS, G2R Laboratory, Université de Lorraine, Nancy, France;4. Shell Global Solutions International B. V., Rijswijk, The Netherlands |
| |
| Abstract: | Digital outcrop models help to constrain the interactions of stratigraphic and structural heterogeneity on ancient depositional systems. This study uses a stochastic approach that incorporates stratigraphic and structural modeling to interrogate the three-dimensional morphology of deep-water channel strata outcropping on Sierra del Toro in the Magallanes Basin of Chile. This approach considers the relative contributions, and associated uncertainty, of erosional downcutting versus post-depositional structural folding and small-offset faulting on the present-day configuration of the submarine channel complexes. Paleodepositional channel-belt gradients were modeled using a combination of three-dimensional visualization, stochastic surface modeling, palinspastic restoration, and decompaction modeling that are bound with errors constrained by stratigraphic and structural uncertainty. Modeling results indicate that at least 100 m of downcutting occurs over 6 km, and the resultant thalweg gradient of 64–125 m/km (decompacted) suggests that the Cerro Toro axial channel belt is an out-of-grade depositional system. Furthermore, the presence of steeper segments (100–175 m/km decompacted) suggests the preservation of one or more knickpoints that are similar in magnitude to tectonically-induced knickpoints on the modern seafloor. The interpreted knickpoints are correlated with a decreasing channel width-depth ratio and an increase of channel depth. These results indicate that stochastic surface modeling using digital outcrop models can constrain stratigraphic interpretations and post-depositional structural heterogeneity. |
| |
| Keywords: | Structural modeling Stratigraphic modeling Deep-water channels Stratigraphic grade Magallanes Basin Cerro Toro Formation Knickpoint Digital outcrop model |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
