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Abstract
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Mello,
M. R., F. T. T. Gonçalves, N. A. Babinski, and F. P. Miranda, 1996,
Hydrocarbon prospecting in the Amazon rain forest: application of  surface
geochemical, microbiological, and remote sensing methods, in D.
Schumacher and M. A. Abrams, eds., Hydrocarbon migration and its near-surface
expression: AAPG Memoir 66, p. 401-411. |
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Chapter
31
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Hydrocarbon
Prospecting in the Amazon Rain Forest: Application of Surface Geochemical,
Microbiological, and Remote Sensing Methods |
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| M. R. Mello
F. T. Gonçalves |
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N. A. Babinski
F. P. Miranda
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Petrobrás
Research & Development Center
Rio de Janeiro, Brazil
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Abstract
Geochemical, microbiological,
and remote sensing investigative techniques were used to reduce exploration
risk in the difficult task of finding oil in the Amazon rain forest. These
nonconventional methods were used successfully in ranking exploratory leads
close to a major gas occurrence in the Juruá area, Solimões
Basin, Brazil. Near-surface soil and sediment samples were collected along
seismic lines and analyzed by geochemical and microbiological methods.
The results showed anomalous concentrations of hydrocarbons and hydrocarbon-consuming
bacteria concordant with structural traps and aligned with the trace of
a major reverse fault. The remote sensing survey presented an anomalous
spectral response of vegetation over the geochemical and microbial anomalies
which may represent the response of plants to long-term anaerobic conditions
due to gas leakage from subsurface reservoir rocks. Further exploration
on potential prospects proved the existence of gas and gas-condensate accumulations.
The use of surface geochemical , microbiological, and remote sensing techniques
thus proved to be cost-effective in constraining exploration risk. |
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