Multithematic geoprocessing and structural analysis on Irati - Rio Bonito Petroleum System, Paraná Basin, Brazil

Abstract

Structural features associated with aspects like migration routes, fluid convergence and/or barriers and seal integrity, among others, may be evaluated with the aid of information obtained by remote sensing and field data. This work is focused on the analysis of the geometry of tectonic structures and their relationship with essential elements of the Irati-Rio Bonito Petroleum System, inserted in the Paraná Basin. The structural framework was outlined with satellite imagery, digital elevation models and geophysical maps. Several techniques relative to lineament analysis were reviewed and implemented by software programming. The description of structural styles, and kinematic & dynamic analysis were performed using field data obtained in key-areas. Another software was developed in order to calculate paleostress compo-nents. It computes maximum, intermediary and minor principal stress position based on Mohr-Coulomb criteria, for each fault individually. That aspect showed to be particularly important in this study due the several tectonic episodes that occurred in the Paraná Basin. The relationships among features of different magni-tudes and structural levels, interpreted by integrating several remote sensors, provided the understanding of the structural envelopment in the studied area. Based on the mapped structural elements, some accumulation controls were pointed out, such as the observed potential for the development of structural traps near regional structures, and the possibility of greater seals integrity associated with NE-SW oriented structural trends. Furthermore, N-S trending elements, generated in an extensional regime, could be associated with the rupture of the upper section, thus allowing leakage of hydrocarbon accumulations.