Non-marine source rocks and hydrocarbon potential in the southwest Sakhalin, Russia

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  • サハリン南西部における非海成根源岩と炭化水素ポテンシャル
  • サハリン ナンセイブ ニ オケル ヒカイセイ コンゲンガン ト タンカスイソ ポテンシャル

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Abstract

There exist coal-bearing Paleogene basins along the Straits of Tatar, in the southwest Sakhalin. Those are presumed to be the northward extension of the hydrocarbon-yielding Ishikari Basin. Several basins in the southwest Sakhalin yields matured source rocks, which are evident from the existence of the offshore Izyilmetiev gascondensate field and many oil seepages on land.<br>Five Paleocene coals, one Miocene coal and four Miocene siliceous mudstones were collected for pyrolysis analysis in the southwest Sakhalin on the land area. The results are as follows;<br>Eocene coal (Nizhne Due Fm.) : HI : 263-430 mg/g, TOC : 45.46-73.05%, Tmax : 408-424 degree C.<br>Miocene coal (Verkhne Due Fm.) : HI : 177 mg/g, TOC : 62.48%, Tmax : 408 degree C.<br>Miocene siliceous mudstone (Kurassi Fm.) : HI : 159-275 mg/g, TOC : 1.26-1.79%, Tmax : 396-411 degree C.<br>According to the results, Paleogene coals have most promising potential to expel hydrocarbon and develop seepages to the surface.<br>This paper reports not only the non-marine source rock potential but also the petroleum potential of basins in the southwest Sakhalin on the analogy of the Yufutsu Field in the Ishikari Basin of Japan.

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