Calci-microbialite as a potential source rock and its geomicrobiological processes |
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Authors: | Yang Hao Wang Yongbiao Chen Lin and Dong Man |
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Institution: | (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
microbialites were well developed. Widespread microbialites have been found in North and South China. Bitumen observed in
many outcrops of Precambrian and late Devonian microbialites further raises the possibility of the calci-microbialite as a
potential hydrocarbon source rock.
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Translated from Earth Science-Journal of China University of Geosciences, 2007, 32(6): 797-802 译自: 地球科学-中国地质大学学报] |
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Keywords: | calci-microbialite potential source rock geomicrobes |
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