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Molecular geochemical characteristics of gas source rocks from the Upper Triassic Xujiahe Formation indicate transgression events in the Sichuan Basin

, : Molecular geochemical characteristics of gas source rocks from the Upper Triassic Xujiahe Formation indicate transgression events in the Sichuan Basin. SCIENCE CHINA Earth Sciences 55(8): 1260-1268

The geochemical characteristics of saturated and aromatic hydrocarbons from different formations and lithologies provide obvious evidence for transgressions that occurred during Upper Triassic Xujiahe stage in Sichuan Basin with a great impact on the source input and depositional environment. A clear dual peak distribution for normal alkanes and obvious abundant compounds sourced from bacteria and algae in whole oil gas chromatogram indicates the abundance of lower organisms input. The ratio of Pr/Ph is low, ranging from .33 to .86 with an average of .6, quite different from Pr/Ph >2. for coal measures in swamp environment, representing source rocks from saline lake or marine facies. In the gas source rocks extracts, abundant ?-carotane, ?-carotane, and their degradated series were detected in the whole oil chromatogram, indicating a reducing environment. The concentrations of methyl steranes and dinosteranes are high. The content of polycyclic aromatic sulfur heterocycles (PASH) is relatively higher in aromatic fraction and the assemblage of fluorene, dibenzofuran, and dibenzothiophene is different from the typical saline lake and the regular swamp facies source rocks, manifesting the transgression effects on gas source rocks.


DOI: 10.1007/s11430-012-4408-1

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