Dispersed and accumulated organic matter in fractures: Primary migration evidences

Conference · Mon Feb 01 00:00:00 EST 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6104941

Lopez, L; Pasquali, J ^[1]

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1. Universidad Central de Venezuela, Caracas (Venezuela)

Concentrated organic matter accumulated in fractures (organic rich fraction) and dispersed organic matter (total rock) of the source rocks of the Querecual and San Antonio formations of the Eastern Venezuelan basin were studied. The distribution of organic matter was studied in polished sections. Sample were analyzed for total organic carbon (Ct), total bitumen and the n-alkane fraction within the bitumen. Dispersed and concentrated organic matter were analyzed separately, and the pertinent differences were established. Concentrated organic matter, probably accumulated to due migration of dispersed organic matter into fractures, or low pressure zones is deficient in n-alkanes of low molecular weight. This fact is interpreted as the result of the migration process that allows the preferential movement of light components of low polarity. It seems that the products of kerogen maturation start their transformation to materials more like crude oils from their primary migration, stage that is to say, within the source rock.

• OSTI ID: 6104941
• Report Number(s): CONF-930306-; CODEN: AABUD2
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:2; Conference: International congress of the American Association of Petroleum Geologists (AAPG), Caracas (Venezuela), 14-17 Mar 1993; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
BITUMENS
GEOLOGIC FRACTURES
SOURCE ROCKS
ORGANIC MATTER
QUANTITATIVE CHEMICAL ANALYSIS
PETROLEUM
ORIGIN
VENEZUELA
PETROLEUM DEPOSITS
ALKANES
DISTRIBUTION
KEROGEN
MATURATION
MIGRATION
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
DEVELOPING COUNTRIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
HYDROCARBONS
LATIN AMERICA
MATERIALS
MATTER
MINERAL RESOURCES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
RESOURCES
SOUTH AMERICA
TAR
020200* - Petroleum- Reserves
Geology
& Exploration