Análise da Deformação e Evolução Estrutural 3D Calcário Albiano da Bacia de Campos

Abstract

The offshore exploration of hydrocarbons in the SE of Brazil has successfully discovered accumulations and oil-producing fields in strata of the Lower Cretaceous. Gravitational landslides resulting from the movement of Aptian salt usually deformed these reservoirs. Two-dimensional (2D) seismic lines from the Campos Basin, SE Brazil, and a three-dimensional (3D) volume on a reservoir scale were interpreted to model the regional structural evolution of the Albian sequence, as well as on a reservoir scale. The study area it is a naturally fractured carbonate reservoir, deformed by the raft tectonics, resulting from Cenozoic tectonic reactivations. This study focused on understanding the regional structural evolution to define the main conditions for fracturing (stresses, mechanical properties, etc.). For this purpose, the 3D Forward Geomechanical Modeling (GFM - Geomechanical Forward Modeling) methodology it is applied. Starting from limited data is possible to generate several possible structural scenarios, respecting the boundary conditions imposed. The GFM modeling depends mainly on the mechanical properties of the materials and the evolutionary history of the region, allowing modeling the temporal evolution of the deformation, identifying different tectonic events that may have originated deformational structures with different characteristics. Thus, tectonic-structural knowledge helps in the construction of geological models and 3D fracture prediction properties that can support production management, mitigating the risk of reactivation of failures, propagation of hydraulic fractures through the injection of fluids during the development of the deposit. Petroleum. The present work demonstrates that the forward geomechanical modeling correlates with the interpreted regional events, according to the regional evolution model, showing that it is a robust tool for reliable prediction of the reservoir's mechanical characteristics, as well as the distribution and temporal evolution of fractures.