Study Of Associate Enrichment Form And Combination Type Of Various Energy Resources In Ordos Basin

Ordos basin is prolific in many energy resources, such as coal, oil, gas, sandstone type of uranium, etc. Vertically, coal distributes in Permo-Carboniferous and Jurassic; oil and uranium distributes mainly in Jurassic while gas distributes in Ordovician and Permian. Laterally, oil distributes in the center and southern parts of the basin, uranium deposits are located at the edges of the basin, natural gas and coal distribute in the whole basin. There are seven association and accumulation form of different energy resources, namely gas in oil, gas in coal, gas enriched in the upper while oil enriched in the lower, uranium in oil, uranium in coal, oil in coal and independent accumulation separately. During the development of the basin, there are four kinds of energy resource combination types which are relative: combination of coal, gas and uranium, combination of coal and gas, combination of coal, oil and gas, combination of coal, oil, gas and uranium, because of the overlap of different tectonic units. Tectonic evolution, sedimentary environment and hot evolution together cause the association and accumulation of different energy resource in Ordos basin. The tectonic evolution framework controls the characteristics of the basin, the internal sequences of basin-fill and the distribution of coal, oil, gas and uranium. Depositional environment is the base of mineral accumulation, that is to say, minerals are differentiated because of sedimentary environment and sedimentary facies; the hot evolution of basin contributes to the formation, accumulation and disappearance of coal, oil, gas and uranium.