Holocene intertidal microbial mats of Qatar and their implications for petroleum source rock formation in carbonate-siliciclastic-evaporite systems

Mirek Slowakiewicz, Lisa Thomas, Maurice E Tucker, S M Ooi, Fiona F Whitaker, Rich D Pancost

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

4 Citations (Scopus)

Abstract

Organic-rich mesohaline microbial mats occur in the intertidal zone of a lagoonal area developed to the lee of a coastal spit in Mesaieed, Eastern Qatar. The mats grow on a substrate of seagrass-rich carbonate mud with cerithid gastropods and other small bioclasts, these mats reach a thickness >3.5 cm. The mats are well laminated with different microbial communities, from cyanobacteria to sulphur bacteria, reflected in the distinct colour changes from green to pink to brown. The mat layers contain spheroids of dolomite plausibly mediated by bacteria. The lipids reflect the biomass of the principal mat-building phototrophic and heterotrophic microorganisms. Moderate amounts of hydrocarbons, n-alkanes, cyanobacterial n-heptadecane and diploptene, isoprenoids including phytane, phytene, phytadiene and squalene were detected in the particular mat layers. The concentration and abundance of n-alkanes and hopanoids increase with depth at the early stage of diagenesis. Such high accumulation of oil-typical compounds may lead to the formation of source rocks for hydrocarbons. Therefore, understanding of hydrocarbon-generating processes will improve our knowledge of organic matter alteration and preservation in marine mixed carbonate-evaporite-siliciclastic systems, as well as the processes operating in the early stages of diagenesis. This will help considerably in the prediction of hydrocarbon occurrence in frontier, as well as mature, petroleum carbonate-evaporite basins.
Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - International Petroleum Technology Conference 2014, IPTC 2014: Unlocking Energy Through Innovation, Technology and Capability
PublisherSociety of Petroleum Engineers
Pages1692-1701
Number of pages10
Volume3
Publication statusPublished - 2014
EventInternational Petroleum Technology Conference 2014: Unlocking Energy Through Innovation, Technology and Capability, IPTC 2014 - Doha, United Kingdom
Duration: 19 Jan 201422 Jan 2014

Conference

ConferenceInternational Petroleum Technology Conference 2014: Unlocking Energy Through Innovation, Technology and Capability, IPTC 2014
CountryUnited Kingdom
CityDoha
Period19/01/1422/01/14

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    Slowakiewicz, M., Thomas, L., Tucker, M. E., Ooi, S. M., Whitaker, F. F., & Pancost, R. D. (2014). Holocene intertidal microbial mats of Qatar and their implications for petroleum source rock formation in carbonate-siliciclastic-evaporite systems. In Society of Petroleum Engineers - International Petroleum Technology Conference 2014, IPTC 2014: Unlocking Energy Through Innovation, Technology and Capability (Vol. 3, pp. 1692-1701). [17400] Society of Petroleum Engineers.