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High Resolution Stratigraphic Modeling of the Paleocene in the Southwestern Santos Basin, Brazil

South Atlantic Basins Research Symposium Presentation
AAPG Distinguished Lecture

Authors: Adriana Henao (presenter), Egberto Pereira, Rio de Janeiro State University (UERJ)

Stratigraphic and sedimentological modeling is a valuable tool for testing the parameters of the depositional process of sedimentary rocks. The present study on the tectono-estratigraphic evolution of the southwestern Santos Basin aims to show the geological context recorded in the Cenozoic of that basin regarding the rate of subsidence and the anomalous behavior of the relative sea level curve. The Cenozoic-Paleocene interval in the basin is mainly controlled by tectonic events in the continental region near to the basin, associated with the evolution of Serra do Mar. These events may explain the anomalous sedimentation recorded in this period, producing a sedimentary stack that generates a discrepancy between the coastal onlap curve and the behavior of the global eustatic level curve, in a condition of constant subsidence. The Dionisos modeling software allowed to test the role of the parameters in the sedimentary process in the Santos basin, by calculating possible deposition scenarios for the platform between 66 and 56 million years. A variety of scenarios were simulated, but only six are explored in this project. The main objective was to understand the controlling parameters of the formation and evolution of this system, considering the relative variations in sea level, sedimentary input, subsidence with a methodological approach that includes the seismic stratigraphic analysis of the seismic lines, chronostratigraphic data and lithological samples of 20 exploratory wells available, and the construction of 2D and 3D stratigraphic models. The scenario two reproduces the geometry observed on seismic section and allow to obtain the parameters that controls the sedimentation considering the techno-sedimentary evolution of the study area. The simulations for scenario two were carried out using the forward subsidence modeling method, with an average sedimentary input of 6325 Km3/Ma and river discharge of 3000 m3/s by placing three sources of input. From the final stratigraphic model in scenario 2, it was possible to estimate the temporal and spatial variation of accommodation, subsidence, sediment input, fluvial discharge, see level and migration of sedimentary sources that controlled the tecto-stratigraphic framework to the southwestern Santos Brasil.


Adriana Henao, Rio de Janeiro State University

Adriana graduated from Rio de Janeiro State University (UERJ).

With 10 years of experience in the industry, she is Research and Associate Professor at America University, in Bogota, Colombia, where she teaches Geology, Petroleum Geology and Environment Sediments. Prior to being a Professor, Adriana worked as Exploration Geologist at GranTierra Energy.

Adriana is a member of EAGE and SPE.

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