【摘要】 酒泉盆地南缘山前冲断带东部金佛寺逆冲推覆带发育上覆高速花岗岩推覆体和推覆体前缘下伏新近系高速层,并有速度倒置的特征,导致下盘原地系统(由新生界和下白垩统组成)掩伏构造的形态在时间域与深度域出现较大差异。本文利用金佛寺逆冲推覆带北部三维地震资料和钻、测井资料,分析了三维区速度变化规律和金佛寺逆冲推覆带北缘下伏新近系高速层空间分布;针对金佛寺逆冲推覆带结构和速度特征,将三维区速度变化趋势向南延拓,应用分区分块层位控制法建立了金佛寺逆冲推覆带速度场;通过层位控制法建立平均速度场,用变速成图法及构造模型层速度充填法开展了金佛寺掩伏构造形态研究,进而提出了该区下步勘探建议。更多还原

【Abstract】 Overburden high-velocity granite nappe in Jinfusi thrust nappe zone and underlying Neogene high-velocity layer in frontal margin of nappe developed in eastern part of piedmont thrust belt of southern margin of Jiuquan basin, which is velocity-overturned character, leading the buried structural feature of autochthone in footwall, which is composed of Cenozoic and Lower Cretaceous, to appear larger difference in time and depth domains. Using 3-D seismic data and drilling as well as logging data in northern part of Jinfusi overthrust nappe zone, the paper analyzed the changing law of 3-D regional velocity and spatial distribution of underlying Neogene high-velocity layer in northern margin of Jinfusi overthrust nappe zone; according to the feature of structure and velocity in Jinfusi overthrust nappe zone, we implemented continuation of 3-D regional velocity changing tendency southward and created velocity field of Jinfusi overthrust nappe zone by blocks-partitioned layer-controlling method; the study of Jinfusi buried structural feature is carried out by velocity-varying mapping on the basis of average velocity field created by layer-controlling method and structural model interval velocity infilling method and suggestion of next exploration in the region is further put forward.更多还原