Heating experiments on green algae of Chlorella and their potential for hydrocarbon generation as precursors of petroleum

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概要

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• Algae are regarded as possible excellent progenitors of petroleum hydrocarbons. They have been considered to be transformed into type I kerogen in sediments during diagenesis, which generates a large quantity of petroleum hydrocarbons on catagenesis and metagenesis. Living green algae of Chlorella vulgaris were heated to 72-650℃ for 24 hours under the N_2 in open system in the laboratory to investigate the changes in physical and chemical properties of green algae with regards to the hydrocarbon generation. The atomic H/C vs. O/C ratios indicate that the green algae unheated and heated at the temperature below 233℃ belong to type II kerogen, and shift their position towards the origin of the coordinate axes along an extension of the evolution path for type II kerogen on a van Krevelen diagram. The green algae heated at the temperature from 258 to 331℃ belong to type III kerogen and evolve along the evolution path for this type kerogen. After being heated at 380℃ the green algae become "residual organic matter" described by Tissot and Welte (1984), which is characterized by abnormally low H/C ratios associated with high O/C ratios. The kerogen types of the heated algae samples appear to be transformed from II through III to "residual organic matter" towards the origin on a curve crossing the evolution path of type III kerogen on a van Krevelen diagram. It was shown that heated green algae have decreasing trends in weight, atomic H/C and N/C ratios, and brightness (statistical Thermal Alteration Index) with increasing temperature. The changes in the atomic H/C ratio indicated that hydrocarbon generation from living green algae should take place mainly in the temperature range of about 111 and 405℃, which infers green algae have more potential for petroleum generation than pollen (Pinus and Styrax), spores (Athyrium) and leaves (Pinus) as precursors of type II kerogen, and woods (Pinus) as precursors of type III kerogen.

• 2010-11-25

著者

• UJIIE Yoshihiro

  Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Hirosaki

• TAKIYA Mitsunari

  Taxation Division, Hirono Town Office

• AIZAWA Takehiro

  Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Hirosaki

• SHIMOFUSA Maiko

  Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Hirosaki

• Ujiie Yoshihiro

  Department Of Earth And Environmental Sciences Graduate School Of Science And Technology Hirosaki Un

• Aizawa Takehiro

  Department Of Earth And Environmental Sciences Graduate School Of Science And Technology Hirosaki Un

• Shimofusa Maiko

  Department Of Earth And Environmental Sciences Graduate School Of Science And Technology Hirosaki Un

• Takiya Mitsunari

  Taxation Division Hirono Town Office

関連論文

• Heating experiments on green algae of Chlorella and their potential for hydrocarbon generation as precursors of petroleum
• Heating experiments on Pinus pollen grains and its relation to petroleum genesis

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