秋田油田地域に分布する新第三系炭酸塩岩中の粘土鉱物と有機物

概要

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The importance of carbonate reservoir and source rocks is underscored by the fact that about half of the world's petroleum is produced from carbonates. In as much as stratigraphic and structural habitats of many oil and gas pools in carbonate rocks suggest indigenous origin of their hydrocarbons, many petroleum geologists are studying the origin and occurrence of petroleum in these rocks. The writers have been studying the origin and distribution of Neogene carbpnate rocks in the Akita Oil Fields of Japan since 1967. In the present paper some data on clay minerals and organic matter present in these rocks are presented. An attempt is made to relate the chemical and mineralogic composition of these rocks to density, porosity and other parameters. The results of the present study can be summarized as follows : (1) On the basis of clay mineral content, carbonate rocks can be grouped into those containing predominantly (a) kaolin clay or (b) montmorillonite clay. In addition, there is a group poor in clay mineral content. (2) Carbonate rocks containing kaolin clay formed in inner-neritic depositional environment, whereas carbonte rocks poor in clay mineral content or those containing montmorillonite clay formed in outer-neritic to bathyal environments.
日本粘土学会の論文
1972-04-25