INTERPRETAÇÃO SÍSMICA E MODELAGEM 3D ESTRUTURAL NA BACIA DE BARREIRINHAS (MARANHÃO, BRASIL)

Karoliny Gusso Conte,Pedro Andrés Chira Oliva

doi:10.21680/2447-3359.2021v7n2id25087

Karoliny Gusso Conte, Pedro Andrés Chira Oliva

Open Access

https://doi.org/10.21680/2447-3359.2021v7n2id25087

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Abstract

Discoveries of hydrocarbons in the basins of the African Equatorial Margin and Guinea Gulf stimulated the exploratory interest in the basins of the Brazilian Equatorial Margin, for being together before the Continental Drift. This interest emerges because both African and South American equatorial margin are considered analogous. The Barreirinhas Basin is a member of the Brazilian equatorial margin. The objective of this work is to present the results obtained through the seismic interpretation and structural 3D modeling, in the context of gravitational tectonics, in an area covered by 3D seismic data, in the Barreirinhas Basin. The compressional domain of an extensive-compressive system was mapped. In this study, were identified reverse faults, thrust faults and fault-related folding like fault-bend and fault-propagation fold that can be accompanied by backthrust features in deep to ultra-deep waters. The 3D structural model allowed the representation of the geometric variations present in the study area. The new information will be important for the identification and evaluation of structures with greater potential for hydrocarbon accumulations and can help in future studies to characterize the reservoir, contributing to the evolution of knowledge of the equatorial margin, especially in the Barreirinhas Basin.

Highlights

The knowledge of the structural framework and the tectonic context are essential for understanding the performance of the petroleum system in a sedimentary basin and for the construction of 3D structural models allows a simultaneous visualization and an integrated interpretation of different geological elements (PAVLOVSKI, 2009).The Brazilian Equatorial Margin includes Foz do Amazonas, Pará-Maranhão, Barreirinhas, Ceará and Potiguar basins
The study of gravity tectonics has received special attention from the scientific community in recent decades, since important potential and/or oil-producing areas are structurally affected by deformations induced by a mobile basal level, such as the Gulf of Mexico, basins of East Brazilian margin, West African margin, basins around the Mediterranean (PEROVANO et al, 2009, p. 490)
Notable examples of structures related to gravitational tectonics and for the gravitational fold-and-thrust belts in the Equatorial Margin Basins (Brazilian and African) were presented by Zalán (1998; 2001, 2011), Oliveira et al (2012); Da Cruz et al (2009), Krueger et al, (2012), Perovano et al, (2009), Pellegrini and Ribeiro (2018); Corredor et al, (2005); Yang et al (2020)

Summary

INTRODUCTION

The knowledge of the structural framework and the tectonic context are essential for understanding the performance of the petroleum system in a sedimentary basin and for the construction of 3D structural models allows a simultaneous visualization and an integrated interpretation of different geological elements (PAVLOVSKI, 2009). The Brazilian Equatorial Margin includes Foz do Amazonas, Pará-Maranhão, Barreirinhas, Ceará and Potiguar basins. These basins are structurally complex, with few published studies and few areas with 3D seismic data. The 3D structural modeling increases the knowledge of the structural framework in the region of gravitational fold-and-thrust belts that are present from the breaking of the continental slope to continental rise in deep to ultra-deep waters of the Barreirinhas Basin

Study Area

Geological Setting

MATERIALS AND METHODS

RESULTS AND DISCUSSION

Structural Maps

FINAL CONSIDERATIONS