Hydrocarbon generation potential and thermal maturity of coal and coaly mudstones from the Eocene Urahoro Group in the Kushiro Coalfield, eastern Hokkaido, Japan
Hydrocarbon generation potential and thermal maturity of coal and coaly mudstones from the Eocene Urahoro Group in the Kushiro Coalfield, eastern Hokkaido, Japan
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日本北海道东部钏路煤田始新世浦幌群煤和煤质泥岩的生烃潜力和热成熟度
DOI：
10.1016/j.coal.2019.103322
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发表时间：
2020
影响因子：
5.6
通讯作者：
Yasuaki Hanamura
中科院分区：
文献类型：
--
作者：
Koji U. Takahashi;Takeshi Nakajima;Yuichiro Suzuki;Sumito Morita;Takayuki Sawaki;Yasuaki Hanamura
本研究揭示了日本北海道东部钏路煤盆地始新世浦幌群煤和煤质泥岩的生烃潜力和热成熟度。煤被分类为亚烟煤或高挥发性C烟煤，并且特征在于高氢含量（6.1 ± 0.4重量%，1σ，干无灰基）。氢指数（HI = 180-409 mg烃/g总有机碳）和随机平均镜质组反射率（VRr= 0.42-0.56%）表明，浦幌群煤和煤质泥岩具有油气倾向或油倾向。基于HI和VRr值，有效油窗口开始于0.55%至0.80%的镜质组反射率范围。尽管各煤层具有相同的热历史，但钏路煤矿煤样的镜质组反射率与HI值成反比。这一结果表明，钏路煤矿样品的镜质组反射率受到抑制。根据校正的镜质组反射率（非抑制镜质组反射率），钏路盆地煤的成熟度向北增加。来自盆地最北部（Hokuyo区域）的样品的非抑制镜质体反射率约为0.8%，在油窗的开始范围内。盆地北方含煤地层的成熟度受火山前缘沿着火山活动的影响。在北叶地区，浦幌群覆盖在一套厚约3000-4000 m的白垩纪-始新世海相碎屑岩（根室群）之上，表明海相碎屑岩中的有机质应达到较高的成熟度（VRr> 0.8%）。
This study reveals the hydrocarbon generation potential and thermal maturity of coal and coaly mudstones from the Eocene Urahoro Group in the Kushiro coal basin (Kushiro Basin) of eastern Hokkaido (Japan). The coal is classified as subbituminous or high volatile C bituminous, and characterized by high hydrogen content (6.1 ± 0.4 wt%, 1σ, dry ash free basis). The hydrogen index (HI = 180–409 mg hydrocarbon/g total organic carbon) and random mean vitrinite reflectance (VRr= 0.42–0.56%) indicate that the coal and coaly mudstones in the Urahoro Group are gas- and oil-prone or oil-prone. Based on the HI and VRrvalues, the effective oil window starts at vitrinite reflectance ranges of 0.55 to 0.80%. The vitrinite reflectance of coal samples from the Kushiro Coal Mine is inversely proportional to the HI value, although each coal seam has the identical thermal history. This result suggests that the vitrinite reflectance of the samples in the Kushiro Coal Mine is suppressed. Based on the corrected vitrinite reflectance (non-suppressed vitrinite reflectance), the maturity of the coal in the Kushiro Basin increases towards the north. The non-suppressed vitrinite reflectance of the samples from the northernmost part of the basin (Hokuyo Area) was approximately 0.8%, which is within the start of the oil window. The maturity of the coal-bearing strata in the northern area of the basin could be affected by volcanic activity along the volcanic front. In the Hokuyo Area, the Urahoro Group overlies a sequence of Cretaceous–Eocene marine clastic rocks (Nemuro Group), which are about 3000–4000 m in total thickness, suggesting that the organic matter in the marine clastic rocks should reach higher maturity (VRr> 0.8%).
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