Abstract
The diagenetic mechanism and process of carbonate rocks, which is different to that of clastic rocks, decides the existence of different existing state organic matters in carbonate rocks. This has been verified by both the microscopic observation of organic petrology and the analysis of organic geochemistry of many samples. Based on the hydrous pyrolysis simulation experiment of the low-mature carbonate rocks, the contrasting study on the yield and their geochemistry characteristics of different existing state soluble organic matters of a series of various maturity samples shows that the different existing state organic matters make different contributions to hydrocarbon generation during every evolution state. So that, the hydrocarbon generation process of carbonate rocks can be summarized as the following three stages: the first is the direct degradation of biogenic bitumen macromolecules during the immature stage, the second is the thermal degradation of a large amount of kerogen at the mature stage, the last stage is the expulsion or release of inclusion organic matter owing to the increased thermal expansion pressure during the high evolution stage.
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References
Tissot, B. P., Welte, D. P., The fate of organic matter in sedimentary basins: generation of oil and gas,Petroleum Formation and Occurrence, Berlin, Heidelberg, New York: Springer-Verlag, 1984, 69–253.
Liu Baojun,Sedimentary Petrology (in Chinese), Beijing: Geological Press, 1979.
Philp, R. P.,Fossil Fuel Biomarkers—Application and Spectra, Amsterdam: Elsevier, 1985.
Wang Zhaoyun, Cheng Keming, Zhang Baishenget al., The study on simulation experiments of hydrocarbon generation and expulsion of mud limestone,Sedimentary Acta (in Chinese), 1996, 14(1): 127.
Powell, T. G., Cook, P. J., Organic geochemistry of phosphorites: relevance to petroleum genesis,Am. Assoc. Petro. Geol. Bull., 1975, 59(4): 618.
Claypool, G. E., Love, A. H., Maughan, E. K., Organic geochemistry, incipient intamorphism and oil generation in black shale members of phosphoria formation,AAPG Bulletin, 1978, 62(1): 98.
Powell, T. G., Some aspects of the hydrocarbon geochemistry of a middle Devonian barrier-reef complex,AAPG Studies in Geology 18, Tulsa, 1984, 45–61.
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Part of achievements of the Eighth Five-Year National Science-Technology Key-Task Project “85-102-02-07”.
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Wang, Z., Cheng, K. The hydrocarbon generation mechanism and the three-stage type model of hydrocarbon generation for carbonate source rocks. Sci. China Ser. D-Earth Sci. 40, 232–238 (1997). https://doi.org/10.1007/BF02877530
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DOI: https://doi.org/10.1007/BF02877530