Geochemical investigation, Oil-Oil and Oil-Source Rock Correlation in the Dezful Embayment, Marun Oilfield, Zagros, Iran

Elham Asadi Mehmandosti, Mohammad Hosseim Adabi, Stephen A. Bowden, Bahram Alizadeh

Research output: Contribution to journalArticle

5 Citations (Scopus)
153 Downloads (Pure)

Abstract

Geochemical analysis of crude oils from Bangestan and Khami reservoirs, and potential source and reservoirs rocks from the Marun Field in the Dezful Embayment, Zagros Fold Belt Iran show that the Kazhdumi Formation (Fm.) is likely to be thermally mature (at least in the oil window) across the entirety of the Marun field, and that it has excellent generative potential as a source rock. Geochemical data also suggest the Pabdeh Formation has remarkable generative potential but is not thermally mature at the crest of the Marun field, although it is likely to be thermally mature in synclinal regions to the NE and SW. The Gurpi Formation, while thermally mature (early oil window) has marginal generative potential. It is notable, therefore, that oils from the Bangestan and Khami reservoirs have biomarker characteristics that do not match bitumen obtained from the Kazhdumi Formation. Examples of this include the ratio of diasteranes to steranes, the proportions of different carbon numbered hopane homologues and the ubiquitous occurrence of alkylated-trimethyl-benzenes. These biomarker characteristics could only have been imparted to the Bangestan and Khami oils by a source rock other than the Kazhdumi Formation. This contrasts with the stable isotope composition of the Bangestan and Khami oils which suggest correlation to the Kazhdumi Formation. Biomarkers are a quantitatively minor fraction of oil, thus it is possible that the biomarker characteristics of the oils was created by mixing Kazhdumi-bitumen with other petroleum from the Gurpi and Pabdeh formations. This could happen if 1) multiple oil charges from different source kitchens filled the same reservoir, or 2) if oil migrated vertically from the flanks and crossed the Gurpi and Pabdeh formations – both of which have been considered regional seals. Both scenario 1) or 2) would point to a filling history more complicated than previously conceived.
Original languageEnglish
Pages (from-to)648-663
Number of pages16
JournalMarine and Petroleum Geology
Volume68
Issue numberPart A
Early online date23 Feb 2015
DOIs
Publication statusPublished - Dec 2015

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Iran
source rock
oils
rocks
oil
biomarkers
biomarker
bitumen
crude oil
fold belt
reservoir rock
benzene
proportion
stable isotope
isotopes
petroleum
histories
occurrences
carbon

Keywords

  • Marun Oilfield
  • Bangestan reservoir
  • Thermal maturity
  • Oil-source correlation
  • Oil-oil correlation

ASJC Scopus subject areas

  • Geology

Cite this

Geochemical investigation, Oil-Oil and Oil-Source Rock Correlation in the Dezful Embayment, Marun Oilfield, Zagros, Iran. / Asadi Mehmandosti, Elham; Adabi, Mohammad Hosseim ; Bowden, Stephen A.; Alizadeh, Bahram.

In: Marine and Petroleum Geology, Vol. 68, No. Part A, 12.2015, p. 648-663.

Research output: Contribution to journalArticle

Asadi Mehmandosti, Elham ; Adabi, Mohammad Hosseim ; Bowden, Stephen A. ; Alizadeh, Bahram. / Geochemical investigation, Oil-Oil and Oil-Source Rock Correlation in the Dezful Embayment, Marun Oilfield, Zagros, Iran. In: Marine and Petroleum Geology. 2015 ; Vol. 68, No. Part A. pp. 648-663.
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note = "The authors wish to thank M.L Bordenave for many fruitful discussions, critical and helpful comments and reviewing an earlier draft of manuscript. We also wish to thank Hormoz Ghalavand,National Iranian Oil Company, for providing the oil samples and support provided by Shahid Beheshti University, Tehran, Chamran University, Ahwaz. The work depended on support provided by technical staff at the University of Aberdeen, U.K. and Kharazmi University. The work was much improved by reviews and comments provided by anonymous reviewers.",
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N1 - The authors wish to thank M.L Bordenave for many fruitful discussions, critical and helpful comments and reviewing an earlier draft of manuscript. We also wish to thank Hormoz Ghalavand,National Iranian Oil Company, for providing the oil samples and support provided by Shahid Beheshti University, Tehran, Chamran University, Ahwaz. The work depended on support provided by technical staff at the University of Aberdeen, U.K. and Kharazmi University. The work was much improved by reviews and comments provided by anonymous reviewers.

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N2 - Geochemical analysis of crude oils from Bangestan and Khami reservoirs, and potential source and reservoirs rocks from the Marun Field in the Dezful Embayment, Zagros Fold Belt Iran show that the Kazhdumi Formation (Fm.) is likely to be thermally mature (at least in the oil window) across the entirety of the Marun field, and that it has excellent generative potential as a source rock. Geochemical data also suggest the Pabdeh Formation has remarkable generative potential but is not thermally mature at the crest of the Marun field, although it is likely to be thermally mature in synclinal regions to the NE and SW. The Gurpi Formation, while thermally mature (early oil window) has marginal generative potential. It is notable, therefore, that oils from the Bangestan and Khami reservoirs have biomarker characteristics that do not match bitumen obtained from the Kazhdumi Formation. Examples of this include the ratio of diasteranes to steranes, the proportions of different carbon numbered hopane homologues and the ubiquitous occurrence of alkylated-trimethyl-benzenes. These biomarker characteristics could only have been imparted to the Bangestan and Khami oils by a source rock other than the Kazhdumi Formation. This contrasts with the stable isotope composition of the Bangestan and Khami oils which suggest correlation to the Kazhdumi Formation. Biomarkers are a quantitatively minor fraction of oil, thus it is possible that the biomarker characteristics of the oils was created by mixing Kazhdumi-bitumen with other petroleum from the Gurpi and Pabdeh formations. This could happen if 1) multiple oil charges from different source kitchens filled the same reservoir, or 2) if oil migrated vertically from the flanks and crossed the Gurpi and Pabdeh formations – both of which have been considered regional seals. Both scenario 1) or 2) would point to a filling history more complicated than previously conceived.

AB - Geochemical analysis of crude oils from Bangestan and Khami reservoirs, and potential source and reservoirs rocks from the Marun Field in the Dezful Embayment, Zagros Fold Belt Iran show that the Kazhdumi Formation (Fm.) is likely to be thermally mature (at least in the oil window) across the entirety of the Marun field, and that it has excellent generative potential as a source rock. Geochemical data also suggest the Pabdeh Formation has remarkable generative potential but is not thermally mature at the crest of the Marun field, although it is likely to be thermally mature in synclinal regions to the NE and SW. The Gurpi Formation, while thermally mature (early oil window) has marginal generative potential. It is notable, therefore, that oils from the Bangestan and Khami reservoirs have biomarker characteristics that do not match bitumen obtained from the Kazhdumi Formation. Examples of this include the ratio of diasteranes to steranes, the proportions of different carbon numbered hopane homologues and the ubiquitous occurrence of alkylated-trimethyl-benzenes. These biomarker characteristics could only have been imparted to the Bangestan and Khami oils by a source rock other than the Kazhdumi Formation. This contrasts with the stable isotope composition of the Bangestan and Khami oils which suggest correlation to the Kazhdumi Formation. Biomarkers are a quantitatively minor fraction of oil, thus it is possible that the biomarker characteristics of the oils was created by mixing Kazhdumi-bitumen with other petroleum from the Gurpi and Pabdeh formations. This could happen if 1) multiple oil charges from different source kitchens filled the same reservoir, or 2) if oil migrated vertically from the flanks and crossed the Gurpi and Pabdeh formations – both of which have been considered regional seals. Both scenario 1) or 2) would point to a filling history more complicated than previously conceived.

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