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Calci-microbialite as a potential source rock and its geomicrobiological processes |
| YANG Hao1, WANG Yongbiao1, CHEN Lin1, DONG Man2 |
| 1.Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China; 2.The Center of Paleontology and Stratigraphy, Jilin University, Changchun 130026, China; |
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Abstract The calci-mircobialite is a special carbonate buildup, which is formed due to the activities of different kinds of microbes. Abundant microfossils preserved in the microbialite show the high-level productivity during deposition, while characteristic sedimentary minerals and geochemical compositions suggest an anoxic marine environment for organic burial. The high-level productivity and anoxic sedimentary environment favor the efficient preservation of organic matter and thus the formation of source rocks. On these points, microbialites could be one of the potential hydrocarbon source rocks, awaiting further geobiological investigation and exploration. Precambrian and some of the great transitional stages in Phanerozoic are critical periods when mircobialites were well developed. Widespread microbialites have been found in North and South China. Bitumen observed in many outcrops of Precambrian and late Devonian mircobialites further raises the possibility of the calci-microbialite as a potential hydrocarbon source rock.
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Issue Date: 05 December 2007
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