石油技術協会誌
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
埋没続成下における堆積層中の沸石帯の生成要因
佐々木 詔雄藤岡 展价藤岡 一男
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ジャーナル フリー

1982 年 47 巻 1 号 p. 1-11

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In this paper, the factors to form the zeolites in the oil-bearing Cretaceous and Tertiary systems of Hokkaido, Akita and Niigata are discussed.
The following data are found at the top of each zeolite zone from the wells of the above areas. Top of the Maximum Geothermal Mudstone Cl- ion zeolite zone burial depth temperature porosity content (m) (°C) (%) (mg/l) Clinoptilolite 800-2, 150 57-69 31 4, 500-14, 000 Analcime 1, 450-3, 800 86-117 18 4, 000-13, 000 Albite 2, 000-5, 800 119-158 12 5, 300-5, 600
The reaction temperatures which begin to form zeolites in the areas are especially influenced by geothermal gradients and effective heating times (time within 15°C of maximum temperature) and/or times since sediments deposited.
The relations of the reaction temperatures to geothermal gradients and effective heating times are tabulated below: Geothermal gradient Effective heating time 3°C/100m 5°C/100m 2 million 4 million years Clinoptilolite 67°C 59°C 65±3°C 60±3°C Analcime 116°C 89°C 111±8°C 95±8°C Albite 157°C 122°C 153±8°C 132±8°C
Zeolites are controlled by geothermal temperatures, effective heating times and geothermal gradients, and have similar tendencies with the maturation of organic matters (e.g. vitrinite reflectance) in the sediments during diagenesis.

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