Formation of immature asphalt from organic-rich carbonate rocks—I. Geochemical correlation |
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| Authors: | E Tannenbaum Z Aizenshtat |
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| Institution: | 1. Department of Geology, Hebrew University, Jerusalem, Israel;2. Institute of Chemistry and Casali Institute for Applied Chemistry, Hebrew University, Jerusalem, Israel |
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| Abstract: | The formation of low-maturity asphaltic oils (immature asphalts) from carbonate source rocks was investigated. The Senonian bituminous rocks (SBR) in Israel are organic-rich carbonate rocks that were deposited in a high productivity environment, and they are part of a sedimentary sequence that also contains cherts and phosphorites. The SBR were studied in different basins, and the samples are from outcrops and three deep drillholes. The bitumen contents of the rocks are exceptionally high (up to 700 mg/g Corg), and immature asphalts are found to be associated with them. Geochemical analysis indicates that the bitumens are indigenous to the host SBR, and the associated asphalts are bitumens that have migrated a short distance with negligible chemical fractionation. The high heteroatom content of the kerogens (up to 30%) in the SBR is suggested as a possible cause of the generation of asphaltic oils in an early stage of maturation. |
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| Keywords: | source rock kerogen bitumen asphalt immature oil carbonates |
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