Spatial positioning method for oil and gas dissipation and sandstone type uranium ore body in multi-energy basin

Abstract

The invention belongs to the technical field of sandstone type uranium ore, and particularly relates to a spatial positioning method for oil and gas dissipation and sandstone type uranium ore body in a multi-energy basin, which utilizes an improved fluid inclusion indirect dating method to accurately determine the time of oil gas dissipation to a uranium ore-bearing layer. The metallogenic age of the sandstone type uranium ore is determined through a total rock or uranium ore U-Pb isotope isochrone dating method, a time sequence of oil and gas dissipation and uranium metallogenic is established, and positioning marks of the uranium ore body under different conditions are determined by combining geological response research of the oil and gas dissipation process. According to the method, direct and indirect marks of oil and gas dissipation, large-scale oil and gas dissipation time and uranium mineralization age are researched, and the influence of large-scale oil and gas dissipation on formation and positioning of the sandstone type uranium ore is found out by combining the effect of oil and gas on uranium precipitation and enrichment; and the prospecting efficiency and precision of the sandstone type uranium ore in the oil-uranium symbiotic multi-energy basin are improved.

Description

technical field [0001] The invention belongs to the technical field of sandstone-type uranium deposits, and in particular relates to a spatial positioning method for oil and gas dissipation and sandstone-type uranium deposits in multi-energy basins. Background technique [0002] Domestic sandstone-type uranium deposits are mostly produced in multi-energy basins, and generally form the distribution law of internal oil and gas-edge uranium deposits, and lower oil and gas-upper uranium deposits. Some scholars have also carried out research on the spatial relationship between oil and gas reservoirs and uranium deposits in basins. It is considered that oil-uranium has a close temporal and spatial distribution relationship, and a corresponding mineralization model map has been established. In addition, a large number of scientific studies believe that oil and gas mainly affect the formation of uranium ore bodies through adsorption, complexation, and reduction. However, uranium ge...

AI Technical Summary

Problems solved by technology

However, uranium geologists have found in the actual study of the sandstone-type uranium ore-forming process that oil and gas escaped to the uranium ore-bearing layer at different times (before uranium ore-forming, during the ore-forming period, and after ore-forming). There are obvious differences in the process of mineralization and the spatial identification of uranium ore bodies: ①Oil and gas escape earlier than uranium mineralization, which can provide a strong reducing environment for uranium mineralization and uranium precipitation and enrichment Reducing substances, which are particularly important for the formation of red variegated clastic rocks, such as the Bashibulake deposit in the northwest margin of the Tarim Basin, the uranium ore bodies are controlled by the distribution range of early oil and gas organic matter-bitumen; At the same time as uranium mineralization, oil and gas on the one hand increased the reduction capacity in the ore-bearing layer, which was beneficial to uranium mineralization, and on the other hand blocked the migration of oxygen-containing uranium-containing water on the surface to the deep. At a certain equilibrium interface, uranium was always developed. Mineralization, forming large-rich uranium ore bodies, such as the Qianjiadian uranium deposit in the southern Songliao Basin, the uranium ore bodies are produced in the structural skylight under the double superimposed geochemical environment of infiltration (oxygen-containing uranium-containing water) and infiltration (oil and gas) ③Oil and gas escape later than the uranium mineralization period, which will protect the ore bodies formed in the early stage, and also reduce the early yellow oxidation zone to gray-green or blue for the second time, especially to cover up the characteristic signs of uranium deposits , which brings difficulties in uranium exploration, such as the Dongsheng uranium deposit in the Ordos Basin, the uranium ore body is produced in the transition zone between green sandstone and gray sandstone

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