中国北方盆地中油气运移对砂岩型铀矿成矿作用讨论

Effects of hydrocarbon migration on sandstone-type uranium mineralization in basins of northern China

以油气成藏动力系统和砂岩型铀矿成矿动力系统为单元,分析了砂岩型铀矿床与油气藏同盆共存的沉积体系、矿床(藏)聚集带之间的联系。认为油气多次运移促使砂岩型铀矿成矿是一种普遍的地质作用,油气运移成藏过程对砂岩型铀矿成矿作用表现为油气初次运移使铀矿化预富集、油气二次运移使间氧化带型铀矿化作用中止与矿体封存、油气藏微渗漏使红色砂层中铀富集成矿等。笔者依据油气对砂岩型铀矿还原作用的结果初步建立了吐哈式、东胜式、钱家店式3种油气藏与砂岩型铀矿共存的基本模式,丰富了砂岩铀矿找矿理论,为多能源矿产综合开发利用提供参考。

The authors used the hydrocarbon accumulation-forming dynamic system and sandstone-type uranium mineralization dynamic system to analyze the relationship between the mineral deposit （petroleum accumulation） assemblage belt and sedimentary system in which the sandstone-type uranium deposit and petroleum accumulation. They think that it is a common geological phenomenon that repeated migration of hydrocarbon promotes sandstone-type uranium mineralization, which is manifested as follows： primary migration results in preconcentration of uranium mineralization, secondary hydrocarbon migration ends early oxidation zone-type uranium mineralization and seals uranium orebodies in the gray strata, and slight leakage of the petroleum accumulation leads to uranium concentration and mineralization in red sandstone. Furthermore, according to the reduction effect of hydrocarbon on the sandstone-type uranium deposit, the authors have constructed the Tuha-, Dongsheng-and Qianjiadian-type basic models of coexistence of the petroleum accumulation and sandstone-type uranium deposit in the same basin, which enrich the theory on search for sandstone-type uranium deposits and provide reference for comprehensive development and utilization of multiple energy resources.