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Acre and Upper Amazon Basins, Brazil

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January 01, 1983


Seismic data were digitally recorded with 6-fold coverage, 24-channel equipment, source was shallow shaped charges and an off-end configuration with maximum offset of 2,900 m (9,514 ft) (15 charges of 3 kg per shotpoint), and the geophone array was 69 m (226 ft) long with 24 equi-spaced elements.


This seismic line is located in the Upper Amazon Paleozoic Basin (Jurua Area) and its orientation is northwest to southeast. The line crosses an expressive northeast to southwest structural trend developed in the central part of the basin.

The reflectors highlighted on the seismic section represent, from top to bottom:

— the top of the Cretaceous section (1);

— the pre-Cretaceous unconformity (2);

— the top of the Carboniferous section (3); and,

— the unconformity between the Permo-Carboniferous and Devonian sections (4).

The Permo-Carboniferous section is intruded by Juro-Triassic diabase sills.

The folding and reverse faulting of the Paleozoic rocks and of the Mesozoic intrusives, is presently being interpreted as the result of compressive efforts that were active in Neo-Jurassic - Eo-Cretaceous time.

The folded and faulted sections are truncated by a regional unconformity over which lies a Cretaceous sandy section.

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AAPG Studies in Geology

Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces

A. W. Bally
A. W. Bally
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American Association of Petroleum Geologists
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Publication date:
January 01, 1983




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