松辽盆地北部中央坳陷区砂岩型铀矿地质条件分析及找矿方向OA

[Objective]In recent years,phased progress has been made in the exploration of sandstone-type uranium deposits in the northern Songliao Basin.However,the overall exploration level remains low,the direction of prospecting is unclear.It is urgent to identify the metallogenic conditions,understand the controlling factors of uranium deposits in the context of oil and gas,establish a metallogenic model,and clarify the direction of prospecting.[Methods]Based on uranium exploration achievements in the northern Songliao Basin,as well as oil and gas drilling,logging,seismic,and testing data from oilfields,this study comprehensively analyzes ore-forming geological conditions such as uranium sources,tectonics,sedimentation,and hydrocarbons,along with the interrelationships between these factors and uranium mineralization.By integrating previous uranium exploration results and theoretical insights,the dominant controlling factors and ore-forming models for the central depression in the northern Songliao Basin are summarized,followed by an assessment of its ore-forming potential and prospecting directions.[Results]The central depression in the northern Songliao Basin possesses excellent metallogenic geological conditions,including uranium sources,tectonic features,sedimentation,and oil and gas reduction processes.Surrounding this area are three granite erosion areas rich in uranium sources,namely the Greater Khingan Range,the Lesser Khingan Range,and the Zhangguangcai Range.The skylight formed by inversion structures,controls the location of mineralization.The bottom of the Sifangtai Formation hosts a 9m to 24m-thick ore-bearing sand body,and the dissipation of oil and gas provides a reducing environment and favorable conditions for ore preservation.[Conclusions]The central depression of northern Songliao Basin is a key exploration area for sandstone uranium in the future,with good exploration prospects.With increased exploration investment and technological breakthroughs,it is highly likely to become an important resource and production base for sandstone uranium deposits.