Minerogenetic characteristics and resources potential of Permian oil shale in the northern slope of Bogda Mountain in Xinjiang
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摘要: 博格达山北麓山前弧形冲断褶皱带上发育强烈变形的二叠系油页岩,产出层位为中二叠统芦草沟组。纵向上芦草沟组上段油页岩较下段发育,而品质下段好于上段,横向上以阜康县三工河地区油页岩最发育,含油率高,由此向东、向西两侧油页岩逐渐减薄,品质降低。芦草沟组油页岩形成于高盐度的半深水—深水陆缘近海湖泊环境,属低熟—成熟优质生油岩。油页岩产状以纸状、层状和砂质油页岩3种类型为主,纸状油页岩品质最好。利用体积法估算博格达山北麓芦草沟组油页岩资源为652.39×108t,技术可采油页岩资源量226.5×108t,页岩油资源量为54×108t,技术可采页岩油资源量18.8×108t,可回收页岩油资源量14.1×108t。三工河地区油页岩品质好,厚度大,埋藏浅,油页岩和页岩油资源量大,是进一步勘查与开发的首选地区。Abstract: Severely deformed Permian oil shale is developed in the piedmont arc-shaped thrust fold zone in the northern slope of Bogda Mountain,with the occurring horizon in Lucaogou Formation in Mid-Permian.Vertically,the oil shale is more developed in upper Lucaogou Formation than in lower Lucaogou Formation,but the quality of the lower reservoir is better than the upper one.Laterally,the oil shale is most developed in Sangonghe area in Fukang County,with high oil content.Oil shale formations decrease gradually eastward and southward with reducing quality.Oil shale of Lucaogou Formation was formed in the semi-deep to deep epicontinental inshore lacustrine environment with high salinity,and is identified as excellent mid-matured to matured oil shale.The occurrences of oil shale are dominated by paper shale,laminar shale and sandy shale,with the paper shale having the best quality.By using volumetric method,it is estimated that the oil shale resources of Lucaogou Formation in the northern slope of Bogda Mountain is 652.39×108t,with the technically recoverable resources of 226.5×108t; the resources of shale oil of 54×108t,with the technically recoverable resources of 18.8×108t and recycled shale oil resource of 14.1×108t.The oil shale in Sangonghe area is characterized by good quality,great thickness,shallow burial and rich potential resources of shale oil,therefore Sangonghe area is the preferred area for further exploration and development.
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Key words:
- The northern slope of Bogda Mountain /
- Lucaogou Formation /
- Oil shale /
- Shale oil /
- Resources
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