油气运聚影响下三维地震精细解译的砂岩型铀矿控矿因素分析——以松辽盆地大庆长垣南端铀矿为例

松辽盆地大庆长垣隆起区砂岩型铀矿资源丰富，但成矿条件复杂。以大庆长垣南端四方台组砂岩型铀矿为研究对象，基于三维地震精细解译成果，对长垣隆起区铀矿的分布特征、富集主控因素及成矿模式开展研究。结果表明：①三维地震资料是刻画断层与砂体分布的有效手段；②砂岩型铀矿主要富集在四方台组一段的河道砂体中，与沟通深部油气储层的输导断层邻近；③河道砂体、油气输导断层及油气圈闭是控制砂岩型铀矿富集的3个主要因素；④长垣隆起区的砂岩型铀矿是含铀地下水与油气运聚协调配合局部富集的结果，建立了输导断层与油气圈闭联合控矿模式。研究成果为含油气盆地砂岩型铀矿勘探提供了新的思路。

Analysis of ore-controlling factors for sandstone type uranium deposits under the influence of oil and gas migration and accumulation based on 3D seismic fine interpretation results: A case study of uranium deposit from the southern end of Daqing Placanticline in Songliao Basin

There are abundant sandstone type uranium resources in Daqing Placanticline of Songliao Basin, but the metallogenic conditions are complex.In this paper, the sandstone type uranium deposit of Sifangtai Formation at the southern end of Daqing Placanticline is taken as the research object.Based on the results of three-dimensional seismic fine interpretation, the distribution characteristics, enrichment main control factors, and mineralization models of uranium deposits in Daqing Placanticline are studied.The results show that: ①3D seismic data is an effective means to characterize the distribution of faults and sand bodies.②Sandstone type uranium deposit is mainly enriched in the channel sand body of the first member of Sifangtai Formation, adjacent to the transport fault connecting the deep oil and gas reservoir.③Channel sand bodies, oil and gas transport faults, and oil and gas traps are the three main factors controlling the enrichment of sandstone type uranium deposits.④The sandstone type uranium deposit in Daqing Placanticline is the result of local enrichment of uranium-bearing groundwater in coordination with oil and gas migration and accumulation, and the ore-controlling model of transport fault and oil and gas trap is established.The research results provide new ideas for the exploration of sandstone type uranium deposits in oil and gas bearing basins.