Title: Sulfur Isotopic Evidence for Biological Karst of Sulfate Rocks in Burial Environment
Abstract: The purpose of this study is to explore the biological karst developing mechanism at the coexistence condition of the sulfate and carbonate rock.The study focuses on the geochemical processes in water-rock-bacteria system by tracing the stable sulfur isotope(34S) fractionation through laboratory experiment combined with the isotope data of the pyrite filling in Ordovician weathering crust in the Ordos basin.The results suggest that the H2S produced by bacterial sulfate reduction(BSR) is characterized by a significant isotope fractionation of 34S,which was controlled by temperature and the SO42-concentration from the dissolution of sulfate rocks in the system.Bacterial sulfate reduction in the experimental system provides an evidence for biological karst on sulfate rocks,and gives a good interpretation for the feature of karst development below the Ordovician weathering crust,Ordos basin.In addition,the presence of pyrite and compacted released water karst confirms that bacterial sulfate reduction took place within the weathering crust during the burial stage.The results provide a new perspective for the analysis of the formation of oil-gas reservoir and the exploration of petroleum gas geology resources.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 3
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