鄂尔多斯盆地多种能源矿产共存富集形式及沉积控制

The Concurrent Enrichment Form and Deposition Control of the Multiple Energy Resources in Ordos Basin

鄂尔多斯盆地以煤和石油为主体的多能源矿产共存富集形式主要有以下几种:油中气、上气下油、油中铀、煤中铀、煤中油、煤中气、煤与油单独赋存等,这些矿产之间又多有成因关系。石炭-二叠纪特殊的沉积环境,形成以煤为主的能源矿产。含煤地层既是上、下古生界天然气的主力烃源岩,又是上古生界煤成气的主力储集层,为油气提供非常有利的生、储、盖空间配置体系,在纵向上呈现下煤上气的能源共存组合形式。有机质的丰度及分布与盆地的兴衰演化、沉积环境及其沉积相密切相关;储层的分布及物性明显受控于沉积体系;沉积体系控制着砂体、泥质岩的空间展布,有利的沉积体系常发育有利的储集层和盖层类型。

There are many concurrent enrichment forms of multiple energy resources dominated by the coal and oil in Ordos Basin, such as the gas-in-oil, upper-gas-and-lower-oil, uranium-in-oil, uranium-in-coal, oil-in-coal, gas-in-coal, the coal and the gas enriched solely, and so on. There are many genetic relations among these minerals. The multiple energy resources dominated by the coal were formed in the special depositional environment of Permian-Carboniferous. The coal bearing strata are both the main hydrocarbon source rock of upper and lower Paleozoic and the main reservoir of the coal-derived gas of upper Paleozoic, which provides the very advantaged special distribution system of source rock, reservoir and cover, So the concurrent form of multiple energy resources of lower-coal and upper-gas longitudinally was formed. The abundance and the distribution of the organism have the close relation with the evolvement, the depositional environment and the depositional facies of the basin. The distribution and the physical character of the reservoir are obviously controlled by the depositional systems, which controlled the spatial spreading of the sands body and the muddy rocks. And the favored reservoirs and covers are often developed in the advantaged systems.