Published 1986 | Version v1
Miscellaneous Open

Analysis of carbon stable isotope to determine the origin and migration of gaseous hydrocarbon in the Brazilian sedimentary basins

Creators

  • 1. PETROBRAS, Rio de Janeiro (Brazil). Centro de Pesquisas

Description

The carbon isotopic composition of natural gases to determine the origin and gaseous hydrocarbon migration of Brazilian sedimentar basins is analysed. The carbon isotopic ratio of methane from natural gases depends on the process of gas formation and stage of organic matter maturation. In the geochemical surface exploration the biogenic gases are differentiated from thermogenic gases, because the last one is isotopically heavier. As the isotopic composition of methane has not changed during migration, the migrated gases from deeper and more mature source rocks are identified by its relative 13C enrichment. The methane was separated from chromatography and and the isotopic analysis was done with mass spectrometer. (M.C.K.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (Portuguese)

Analisa-se a composicao isotopica do carbono de gases naturais para determinar a origem e migracao de hidrocarbonetos gasosos das bacias sedimentares brasileiras. A razao isotopica do carbono do metano de gases naturais depende do processo de formacao e do estagio de maturacao da materia organica. Na exploracao geoquimica de superficie os gases bioquimicos sao diferenciados dos gases termoquimicos, por estes ultimos serem mais pesados. Como a composicao isotopica do metano nao varia durante a migracao, os gases migrados de profundidades maiores e de rochas geradoras mais maturas sao identificados pelo seu relativo enriquecimento em 13C. O metano foi separado dos outros gases presentes por cromatografia e a analise isotopica foi feita com um espectrometro de massa. (Autor)

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Additional details

Additional titles

Original title (Portuguese)
Analise dos isotopos estaveis de carbono para determinar a origem e migracao dos hidrocarbonetos gasosos nas bacias sedimentares brasileiras

Publishing Information

Imprint Pagination
8 p.
Report number
INIS-BR--653

Conference

Title
3. Brazilian Congress of Petroleum.
Dates
5-10 Oct 1986.
Place
Rio de Janeiro, RJ (Brazil).

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
18054816
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
BRAZIL; CARBON 13; CARBON 14; GAS CHROMATOGRAPHY; GEOCHEMICAL SURVEYS; GEOLOGIC STRUCTURES; ISOTOPE RATIO; METHANE
Descriptors DEC
ALKANES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON ISOTOPES; CHROMATOGRAPHY; DEVELOPING COUNTRIES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; GEOLOGIC SURVEYS; HYDROCARBONS; ISOTOPES; LATIN AMERICA; LIGHT NUCLEI; NUCLEI; ORGANIC COMPOUNDS; RADIOISOTOPES; SEPARATION PROCESSES; SOUTH AMERICA; STABLE ISOTOPES; YEARS LIVING RADIOISOTOPES