Geoelectric structure beneath limestones of the Sao Francisco Basin, Brazil

Travassos, Jandyr M.; Menezes, Paulo T. L.

doi:10.1186/bf03351578

Cited by 15 publications

(4 citation statements)

References 36 publications

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“…; Erenin ). A previous broadband magnetotelluric study in the region reveals a thick 1000 ohm.m resistive upper lithospheric structure extending over 70 km deep (Travassos and Menezes ). In the study area the lavas and hypabyssal intrusions, mainly kimberlites and lamproites (black dots in Fig.…”

Section: Geological Setting Of the Regis Kimberlite Pipementioning

confidence: 73%

3D magnetic interpretation of the Regis kimberlite pipe, Minas Gerais, Brazil

Menezes

Terra²

2011

Near Surface Geophysics

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In the present work, high-resolution ground magnetic data are used to unveil the structure of the Regis kimberlite pipe, which is located in a well-known diamondiferous province in the central portion of Brazil. The main tectonic feature of the area is a NW-SE major crustal fracture zone, extending for more than 3000 km within Brazil, along which Regis and several other kimberlite pipes have intruded. The area is located at low magnetic latitude (inclination approximately 27 o south) and the ground magnetic anomaly associated with the Regis pipe appears as an isolated asymmetric dipole-like source caused by magnetization primarily in the direction of the Earth's magnetic field. We inverted this high-resolution magnetic data set in order to recover the 3D effective susceptibility model of the studied pipe. We obtained an asymmetric conical-shaped strongly magnetized body (35 × 10 -3 SI units) extending from 50-720 m depth. Prior to the inversion, the data were upward continued to 30 m above the surface to attenuate high-frequency noise and mitigate inversion artefacts. Our results were used to better define the subsequent drilling positions to thoroughly evaluate the economic potential of the Regis pipe. One available borehole drilled approximately in the centre of the structure corroborates our interpretation. 2007). The magnetic study described herein was initiated prior to

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Section: Geological Setting Of the Regis Kimberlite Pipementioning

confidence: 73%

3D magnetic interpretation of the Regis kimberlite pipe, Minas Gerais, Brazil

Menezes

Terra²

2011

Near Surface Geophysics

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“…Among the EM methods, MT is the classical method used for sub-salt imaging [22] but also for sub-carbonate [23] and sub-basalt imaging [24,25], which face similar challenges presented by autochthonous and allochthonous salt body zones.…”

Section: Sub-salt Imagingmentioning

confidence: 99%

Twenty Years of CSEM Exploration in the Brazilian Continental Margin

et al. 2023

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The controlled source electromagnetic (CSEM) method is frequently used as a risk reduction tool in hydrocarbon exploration. This paper aims to provide a comprehensive historical review of the CSEM method’s twenty-year history in the Brazilian continental margin. Since 2003, we have significantly improved our understanding of CSEM resistivity data across various geological scenarios. This review presents a roadmap of the technical advancements in acquisition design and interpretation techniques. As a result, our understanding of the methodology has broadened from traditional to more general use, such as salt imaging, gas hydrates, geohazard mapping, and reservoir characterization. Finally, we indicate the potential upcoming CSEM applications in new energy resources and carbon capture and storage.

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“…1). The region is characterized by a thick upper lithospheric structure extending over 70 km deep (Travassos and Menezes, 1999). The main rock types are carbonatites, kimberlites and ultramafic bodies, represented by intrusive structures such as dikes, sills and diatremes.…”

Section: Geological Settingmentioning

confidence: 99%