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MORPHOSTRUCTURAL ANALYSIS AS AN AID TO HYDROCARBON EXPLORATION IN THE AMAZONAS BASIN, BRAZIL
Author(s) -
Miranda F. P.,
Hora M. P. P. da Boa
Publication year - 1986
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1986.tb00379.x
Subject(s) - geology , structural basin , basement , sedimentary rock , fault (geology) , sedimentary basin , paleontology , seismology , socle , hydrocarbon exploration , feature (linguistics) , geomorphology , archaeology , geography , linguistics , philosophy , inversion (geology)
A significant contribution to regional studies in the Amazonas Basin has been provided by the morphostructural analysis of MSS‐LANDSAT and SLAR imagery. The interpretation of remote sensing data led to the detection of many morphostructural anomalies in the Upper Amazonas Basin. A comparison between these anomalies and the available geological and geophysical data permitted the definition of two distinct morphostructural domains in this region. The first comprises a set of E‐W anomalies, located in a thinner sedimentary cover portion of the Upper Amazonas Basin. This feature was tentatively attributed to a prominent basement hinge line. The second morphostructural domain embraces anomalies situated where the sedimentary pile exceeds 1,600 m. In this domain, many anomalies seem to be related to ENE‐striking reverse faults. These morphostructural anomalies are arranged along ENE and E‐W aeromagnetic trends forming morphostructural trends. Analysis of MSS‐LANDSA T and SLAR imagery near the boundary between the Middle and Lower Amazonas basins indicates that several morphostructural anomalies are aligned in well‐defined directions, also suggesting the presence of morphostructural trends. These trends, often striking ENE, lie among zones with sharp magnetic gradients interpreted as expressions of basement compositional boundaries. Such morphostructural trends are also found near positive small‐wavelength magnetic anomalies, interpreted as possible grabentype structures.