Análise de volumes de sal em restauração estrutural: um exemplo na bacia de Santos

Abstract

Halokinesis complexity in the central portion of Santos Basin involves significant structures and deformed depocenters, differentiated along the tectonic transport direction. Five geological cross-sections with an entire stratigraphic record in the study area have been restored to investigate different deformation styles, including the evolution of Cabo Frio Fault, coherently inserted into the tectonosedimentary evolution of Santos Basin. The procedure combines 2D restoration with 3D treatment and analysis through the following steps: layering removal, decompaction and flexural isostatic compensation; decoupled restoration of salt tectonics; material conservation (including salt); retrieval of the layering when differential strain rates affect uncoupled domains; bathymetric calibration of the restored set, and treatment and spatial analysis of results. Detailing of 14 restoration steps has properly discretized the deformation, minimized procedure deviations, and provided geometric and stratigraphic coherence in the space-time domains. The controlled salt redistribution has confirmed the effects of sedimentary aggradation and pre-existing structures on the strain. The results highlight the reciprocity importance of the effects of the halokinetic lateral displacement on isostasy, eustasy, bathymetry, and decompaction, which was not considered in the existing restoration programs.