Distribution Of Channel Sand Bodies In The Lower Section Of Sifangtai Formation In Aojiu District Of Daqing Placanticline And Its Influence On Uranium Enrichment

Rich uranium resources were found in the channel sand bodies of the lower section of the Sifangtai Formation in the Songliao Basin.The sedimentary system controls the distribution of the sand bodies.The distribution characteristics of the sand bodies play an important role in controlling the reserves and spatial distribution of uranium resources.Predicting the distribution of sand bodies and exploring the relationship between it and the distribution of uranium deposits are of great significance for guiding the exploration of sandstone-type uranium deposits.This paper uses the seismic waveform indicator inversion method to predict the sand body in the lower part of the Sifangtai Formation,and uses the attribute value fitting method to obtain the sand body thickness map;the section seismic facies analysis and the channel tracing method are used to divide the two phases of the river channels to obtain the Sifang Two-stage channel distribution characteristics in the lower section of the Tai Formation;combined with the types and distribution characteristics of uranium deposits and the geological characteristics of industrial uranium layers,the influence of sand body distribution on uranium enrichment is explored.The research results show that:(1)Sand body inversion prediction was carried out for the Sifangtai Formation.The characteristics of sand body thickness in the lower part of Sifangtai Formation are clarified.The analysis of the well fit rate through the prediction results shows that fine sand larger than 6 meters can be identified,and the prediction accuracy rate is ZKDXout 83.4%.(2)Using the root-mean-square amplitude attribute on the plane and identifying the seismic facies characteristics on the profile,the two-stage channel distribution characteristics of the lower section of the Sifangtai Formation are traced and described.(3)Based on the distribution of industrial-grade ore bodies found in the work area,analysis shows that the lower part of Sifangtai Formation has large thickness and good physical properties,which provides enrichment space for uranium deposits;the eastern part of the study area is the denudation zone,with denudation lines and river channels The strike is vertical,and the lower part of the Sifangtai Formation where the river is located is generally westward with a certain inclination.The river can be used as a channel for communication and denudation of the skylight,providing favor ZKDXle conditions for the accumulation of uranium-rich water.Oil source faults can communicate deep oil and gas,and can restore and precipitate high-valent uranium ions in formation water.Channel sand bodies.