ケロジェンの熱分解による有機熟成作用の評価 : 北海道北部地域に分布する白亜系・第三系中のケロジェンを例として

概要

論文の詳細を見る
Organic maturation of kerogen was discussed from the yielded n-alkanes and weight losses by the pyrolysis of 67 kerogens separated from the Upper Cretaceous to Miocene muddy rocks in the northern part of Hokkaido. The results are as follows; 1) Ratios of n-C_4H_<10>/CH_4 and n-C_6H_<14>/CH_4 of the pyrolyzed products increase with burial depth in the Miocene core samples of the MITI-Hamayuchi Borehole, but decrease in the Paleogene and Cretaceous core samples of the MITI-Sorachi Borehole. 2) n-Alkane composition generated from kerogens by pyrolysis at 200℃ depend on their geologic ages, though independent at 400℃. Ratios of C_<16>〜C_<20>/C_<10>〜C_<15> generated at the former condition decrease from the Neogene kerogens to the Cretaceous through the Paleogene. 3) There is the distinct correlation of the Carbon Preference Index of n-alkanes (C_<13>〜C_<20>) between the pyrolyzed products of each kerogen at 200℃ and 400℃, the former being smaller than the latter, though they do not show any relation with burial depth.
日本地球化学会の論文
1981-03-30