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Geochemical correlation of the Cenomanian/ Turonian source rock sequences in the Mediterranean, North Africa - Adriatic/Dinaric area

Geochemical research of Cenomanian/Turonian strata in North Africa and Adriatic/Dinaric area indicate the presence of good source rock sequences with high generative potential. Organic rich strata in the northwestern Africa developed by upwelling systems, however this phenomena gradually decreased along the African coast and completely disappeared in the eastern Mediterranean. In the Adriatic/Dinaric and other areas development of good source rocks was controlled by formation of oxygen minimum zone. In the areas with strong influence of upwelling source rocks are represented by black shales, however in the Adriatic/Dinaric area micritic limestone and bituminous laminated limestones exhibit good source rock properties. Organic matter consists of amorphous, hydrogen and often sulphur rich components originated predominantly from algal and bacterial lipids. Source rock maturity varies in broad range depending on the subsidence, thermal history and other geological factors. On the basis of analyzed data it can be concluded that the Cenomanian/Turonian anoxic event was global in the broader Mediterranean area.

Cenomanian/Turonian strata; North Africa; Adriatic/Dinaric area; source rocks; organic facies; maturity

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