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Geochemical features and genetic mechanism of deep-water source rocks in the Senegal basin, West Africa

ABSTRACT
This paper discusses the maturity of source rocks of the Senegal basin through basin simulation, so as to get a better understanding of oil- source correlation. Based on the analysis of pyrolysis chromatography and TOC data of core samples taken from 11 wells, the model of Cenomanian-Turonian marine sediment-organic facies was established, and the genetic mechanism of high-quality source rocks was clarified. The results show that source rocks in the Senegal Basin may occur in the Aptian-Albian of Lower Cretaceous and Cenomanian-Turonian of Upper Cretaceous. One is hybrid organic facies in the shallow carbonate platforms in the shelf area and is characterized by moderate to high TOC (<3%) and HI (100-400 mg HC/g). The other is well-preserved marine facies in continental slope to abyssal sea, with high TOC (>3%) and high HI (max 900 mg HC/g TOC). Molecular fossils originating from aryl carotene are the indicator of the existence of euphotic zone in the ancient ocean. The compounds of aryl isoprenes and sulfurous aryl isoprenes are detected in the black shale samples of well DSDP 367. They rooted in photosynthetic green sulfur bacteria and the carbon isotope value of these compounds is higher 10‰~15‰ than those of fossil molecules of algae and cyanobacteria. Two packages of oil-prone source rocks separately occurr in the Aptian-Albian of Lower Cretaceous and Cenomanian-Turonian of Upper Cretaceous. High-graded marine source rocks of the Senegal Basin may occur in a sulfurous, anoxic deep-water environment with sufficient carbon sequestration
KEYWORDS
PAPER SUBMITTED: 2018-11-30
PAPER REVISED: 2019-01-25
PAPER ACCEPTED: 2019-01-05
PUBLISHED ONLINE: 2019-05-18
DOI REFERENCE: https://doi.org/10.2298/TSCI181130153W
REFERENCES
  1. Tong Xiaoguang and Guan Zengmiao. Atlas of World Petroleum Exploration and Development (Africa). Petroleum Industry Press, Beijing,China, 2002.
  2. Schlanger S O, Jenkins H C. Cretaceous Oceanic Anoxic Events: Causes and Consequences. Geology en Mijnbouw, 55 (1976), 3,pp.179-184
  3. Jenkins H C. Cretaceous Anoxic Events: from Continents to Oceans. Journal of the Geological Society, 137(1980), 2, pp.171-188
  4. Leckie R M, Bralower T, Cashman R. Oceanic Anoxic Events and Plankton Evolution: Biotic Response to Tectonic Forcing the Mid-Cretaceous. Paleoceanography, 17(2002), 3, pp.13-1-13-29.
  5. Xu Hanliang, Shan Xuanlong, GAO Xuan, et al. Heavy Oil Accumulation Condition and Enrichment Regularity of Senegal Basin in West Africa. Science Technology and Engineering, 14(2014), 16, pp.211-215
  6. Abdelrahman E M, Tealeb A, Hassan R M. A Least-Squares Derivative Analysis of Gravity Data Applied in Senegal, West Africa. Journal of African Earth Sciences, 33(2001), 1, pp.165-175
  7. Zheng Yingzhao. Petroleum Geology Features and Exploration Potential Analysis in the Coastal Basins of West Africa. thesis, China University of Geosciences (Beijing), Beijing, China, 2012
  8. Liu Yanli. The Petroleum Geology and Prospective Analysis of The Senegal Basin. Geology and Resources, 23(2014), 2 , pp.197-201, 196.
  9. Xiong Liping, Liu Yanli, and Huo Hong. Comparison of the hydrocarbon accumulation patterns of petroliferous basins between the north and south parts of the West African coast. Oil & Gas Geology, 31(2010), 4, pp.410-419
  10. Xu Zhicheng, Lu Fuliang, Fan Guozhang, et al. Deepwater petroleum geology and exploration potential of West Africa coastal basins. Petroleum Geology and Recovery Efficiency, 19(2012), 5, pp.1-5, 11
  11. Feng Guoliang, Xu Zhicheng, Jin Jiuqiang, et al. Basin Evolution and Development Characteristics of Deepwater Oil and Gas Fields in Coastal Basins, West Africa. Marine Origin Petroleum Geology, 17(2012), 1 , pp.23-28
  12. Nzoussi-Mbassania P, Khamlib N, Disnara J R, et al. Cenomanian-Turonian Organic Sedimentation in North-West Africa:A Comparison between the Tarfaya (Morocco)and Senegal Basins. Sedimentary Geology, 177(2005), 3, pp.271-295.
  13. Shipboard Scientific Party, Site 367: Cape Verde Basin, Init. Rep. Report No.DSDP 41,2005
  14. Espitalie' J, Le Laporte J, Madec M, et al. Me' thode rapide de caracte' risation des roches me`res de leur potentiel pe'trolier et de leur degre' d' e'volution. Revue de l'Institut Francais du Petrole, 32(1977) , pp.23-42
  15. Tissot B P, Welte D H.,Petroleum Formation and Occurrence, Springer-Verlag, Berlin, Germany, 1984
  16. Morse W J, Berner A R. What Determines Sedimentary C/S Ratio? Geochimica et. Cosmochimica Acta, 59(1995), 6, pp.1073-1077
  17. Peters E K, Moldovan J M. The Biomarker Guide: Interpreting Molecular Fossils in Petroleum and Ancient Sediment, Prentice Hall, Englewood Cliffs, NJ, 1993
  18. Waples D W. Reappraisal of Anoxia and Organic Richness, with Emphasis on Cretaceous of North Atlantic. AAPG Bulletin, 67(1983), 6, pp.963-978
  19. Kruijs E, Barron E. Climate model prediction of paleo-productivity and potential source-rock distribution//Huc. A.Y, Ed. Deposition of Organic Facies. Tulsa, OK: AAPG, 30 (1990) , pp.195-216.
  20. Pedersen T F, Calvert S E. Anoxia vs. Productivity: What Controls the Formation of Organic-Carbon-Rich Sediments and Sedimentary Rocks? AAPG Bulletin, 74(1990), 4 , pp.454-466
  21. Jiao Nianzhi. Carbon fixation and sequestration in the ocean, with special reference to the microbial carbon pump. Scientia Sinica (Terrae), 42(2012), 10 , pp.1473-1486
  22. Philip J, Babinot J F, Tronchetti G, et al. Late Cenomanian//Dercourt J, Ricou L E, Vrielynck B, Eds. Atlas Peri-Tethys, Palaeogeographical Maps.thesie,CCGM/CGMW, Paris,France, 2000
  23. Thurow J, Kuhnt W. Mid-Cretaceous of the Gibraltar Arch Area//Summerhayes C P, Shackleton N J, eds. North American Palaeoceanography. Geological Society, London, Special Publications, 21(1986), pp.423-445
  24. Koopmans M P, Köster J, Van Kaam-Peters H M E, et al. Diagenetic and Catagenetic Products of Isorenieratene: Molecular Indicators for Photic Zone Anoxia. Geochimica et. Cosmochimica Acta, 60(1996), 22 , pp.4467-4496
  25. Damsté J S S, Köster J. A Euxinic Southern North Atlantic Ocean During the Cenomanian/Turonian Oceanic Anoxic Event. Earth and Planetary Science Letters, 158(1998), 3 , pp.165-173