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Title: Geochemical features of oils from western and southern Gulf of Mexico: Reconstruction of the depositional environment of their source rocks

Abstract

Three main source rock depositional environments can be interpreted from the western and southern Gulf of Mexico oils: marine deltaic, marine carbonate and marine carbonate evaporitic. Marine deltaic oils are geographically limited to the Burgos and Macuspana basins. Their molecular features suggest a source from reworked, bacterially degraded terrestrial higher plants deposited in siliciclastic dysaerobic depositional environments. They can be recognized by their {delta}{sup 13}C values (between 23.6 to -21.7 {per_thousand}), low sulphur content (0.06 to 0.12 wt % S), high pristane/phytane ratios (1.95 to 3.43), high concentrations of oleanane, and very low sterane/hopane mbbs (<0.05). Marine carbonate oils have a widespread distribution throughout the western and southern Gulf of Mexico. They are present from Tampico Basin to Campeche Sound. Isotopic values of these oils range from -24 to -28.1 {per_thousand}. They are characterized by medium to high sulphur content, pristane/phytane <1, abundant extended hopanes C{sub 35} hopanes greater than or in similar abundance to their C{sub 34} counterparts, and presence of hexahydrobenzohopanes. Subtle internal differences in biomarker composition of this oil set can be interpreted in terms of salinity, clay content and oxygen depletion variations. Marine carbonate evaporitic oils are present in the Veracruz Basin and the Chiapas-Tabasco area.more » The oils are recognized by their heavy {delta}{sup 13}C values (between -23 to -24 {per_thousand}), very low sterane/hopane ratios, high C24-tetracyclics/C26-tricyclics terpanes ratios, and C{sub 33} hopanes greater than their C{sub 34} counterparts. In this oil set the organic matter is dominated by a strongly prevailing bacterial input. The diversity of oil families from the western and southern Gulf of Mexico explains the enormous petroleum potential of this region.« less

Authors:
; ;
Publication Date:
OSTI Identifier:
421104
Report Number(s):
CONF-9609255-
Journal ID: AABUD2; ISSN 0149-1423; TRN: 96:005770-0088
Resource Type:
Journal Article
Journal Name:
AAPG Bulletin
Additional Journal Information:
Journal Volume: 80; Journal Issue: 8; Conference: American Association of Petroleum Geologists (AAPG) international conferences and exhibition, Caracas (Venezuela), 8-11 Sep 1996; Other Information: PBD: Aug 1996
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; GULF OF MEXICO; STRATIGRAPHY; PETROLEUM; GEOCHEMISTRY; EXPLORATION; RESERVOIR ROCK; SEDIMENTATION; DIAGENESIS

Citation Formats

Guzman, M, Mello, M, and Holguin, N. Geochemical features of oils from western and southern Gulf of Mexico: Reconstruction of the depositional environment of their source rocks. United States: N. p., 1996. Web.
Guzman, M, Mello, M, & Holguin, N. Geochemical features of oils from western and southern Gulf of Mexico: Reconstruction of the depositional environment of their source rocks. United States.
Guzman, M, Mello, M, and Holguin, N. 1996. "Geochemical features of oils from western and southern Gulf of Mexico: Reconstruction of the depositional environment of their source rocks". United States.
@article{osti_421104,
title = {Geochemical features of oils from western and southern Gulf of Mexico: Reconstruction of the depositional environment of their source rocks},
author = {Guzman, M and Mello, M and Holguin, N},
abstractNote = {Three main source rock depositional environments can be interpreted from the western and southern Gulf of Mexico oils: marine deltaic, marine carbonate and marine carbonate evaporitic. Marine deltaic oils are geographically limited to the Burgos and Macuspana basins. Their molecular features suggest a source from reworked, bacterially degraded terrestrial higher plants deposited in siliciclastic dysaerobic depositional environments. They can be recognized by their {delta}{sup 13}C values (between 23.6 to -21.7 {per_thousand}), low sulphur content (0.06 to 0.12 wt % S), high pristane/phytane ratios (1.95 to 3.43), high concentrations of oleanane, and very low sterane/hopane mbbs (<0.05). Marine carbonate oils have a widespread distribution throughout the western and southern Gulf of Mexico. They are present from Tampico Basin to Campeche Sound. Isotopic values of these oils range from -24 to -28.1 {per_thousand}. They are characterized by medium to high sulphur content, pristane/phytane <1, abundant extended hopanes C{sub 35} hopanes greater than or in similar abundance to their C{sub 34} counterparts, and presence of hexahydrobenzohopanes. Subtle internal differences in biomarker composition of this oil set can be interpreted in terms of salinity, clay content and oxygen depletion variations. Marine carbonate evaporitic oils are present in the Veracruz Basin and the Chiapas-Tabasco area. The oils are recognized by their heavy {delta}{sup 13}C values (between -23 to -24 {per_thousand}), very low sterane/hopane ratios, high C24-tetracyclics/C26-tricyclics terpanes ratios, and C{sub 33} hopanes greater than their C{sub 34} counterparts. In this oil set the organic matter is dominated by a strongly prevailing bacterial input. The diversity of oil families from the western and southern Gulf of Mexico explains the enormous petroleum potential of this region.},
doi = {},
url = {https://www.osti.gov/biblio/421104}, journal = {AAPG Bulletin},
number = 8,
volume = 80,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1996},
month = {Thu Aug 01 00:00:00 EDT 1996}
}