Mathematical model for release of compounds from kerogen and its applications for Neogene sediments of the Shinjo basin, Japan
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概要
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A mathematical model has been proposed to obtain depth profiles of compound abundances (release extents) released from thermal decomposition of kerogen in a sedimentary sequence using parameters for reaction kinetics in the decomposition and for thermal history of the sequence. Equations for release extents and differential release extents of compounds were derived from a rate law of first-order reaction and the Arrhenius expression. The model was applied for the Neogene Shinjo sediments, whose depths were reported by Taguchi et al. (1986). The activation energies and pre-exponential factors for benzene, hexane, toluene, phenol, heptane and indene on release from kerogen were reported by Oba et al. (2002). The geothermal gradient was determined by the method by Suzuki (1984) and data by Suzuki and Shimada (1983), and the rate of the sediment subsidence by Shiraishi and Matoba (1992). The depth profiles of differential release extents for compounds were different in temperature (therefore, depth) from each other. The average temperatures of the maximum releases were 134℃ for benzene, 159℃ for hexane, 136℃ for toluene, 143℃ for phenol, 152℃ for heptane, and 121℃ for indene. The temperatures for benzene, toluene and indene appear in the petroleum generation zone and for the rests below the zone. Furthermore, the model indicated that hexane and heptane of aliphatic hydrocarbons were released in sediments deeper than benzene, toluene and indene of aromatic ones. These calculated depth profiles were similar in pattern to those reported for solvent extractable aliphatic and aromatic hydrocarbons in the sediments, but shifted toward deeper sediments than the reported profiles. These shifts may be corrected by taking consideration of the effect of sediment constituents for the determination of parameters for reaction kinetics.
- 日本有機地球化学会の論文
- 2002-06-30
著者
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Oba Masahiro
Department of Chemistry, University of Tsukuba
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Shimoyama Akira
Department of Chemistry, University of Tsukuba
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Oba Masahiro
Department Of Chemistry University Of Tsukuba
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Shimoyama Akira
Department Of Chemistry University Of Tsukuba
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