Ordos Basin Associated With Energy And Mineral Asphalt Geochemical Study

The formation of the asphalt depends on some functions that they include heat-changing of crude oil, taking off asphaltization , water washing, and biodegradation of the living etc. Meanwhile, the asphalt is an important energy resource also. In recent years, the main research of the asphalt is its origin, character, and chemical structure. But the study of geological application is not enough. The asphalt is an associated product of energy resource, such as coal, petroleum, gas and uranium, and so on. So it has an abundant of geological information. This paper discusses some geochemical characters and behaviors of associated bitumen of some energy resources. And then discloses some geochemical features of the energy resources in Ordos Basin. The geochemical characters of associated bitumen have been analyzed. It is said:1. Compared with crude oil in Ordos Basin, the lanthanon characters of the asphalt have some similarity, at the same time, they have some difference. The source of the asphalt and the crude oil are homogeneity in some way, but lanthanon fractionation of the asphalt is relatively high. So it can show that the asphalt is higher than the evolution degree of crude oil. Origin has also variety, some samples maybe exert deep fluid.( Hence, these indicate that the asphalt has high interaction with deep fluid when the asphalt is transporting, and it is inversely with surface fluid.2. According to the characters of trace elements and the lanthanon of associated bitumen of oil-bearing sandstone, their geochemical characters are similar with crude oil and associated bitumen of crude oil. The difference is that preponderant enrichmental lanthanons of associated bitumen of oil-bearing sandstone are higher than those of crude oil and the asphalt. The associated bitumen of oil-bearing sandstone has less deep source.3. In the coal mines of the southeast Ordos Basin, associated bitumen of coal have some characters that they are mixed sources. Preponderant enrichment elements of the asphalt are similar with coal. So sources of the asphalt and coal arehomogeneity in some way. The components of associated bitumen with the coal-bed gangue are mainly original organic fluids in the process of the diagenesis. They belong to the crust-derived organic fluids.4. The components of coal-bed gas in Chenjiashan coal mines and He isotope have been analyzed. It shows that mantle sources have been joined possibly in formation process of coal-bed gas.5. According to results of laser Raman spectroscopy and the structural location of the samples, the basement faults in the basin have some influences for component of the asphalt. The reducibility gas such as CH4, C2H2, CaHjand C2H6 can be found in chloroform asphalt extensively, whose content is growth and decline with the oxygenization gas CO2, and all of these show the features about later reformation and redox condition for the chloroform asphalt.