【摘要】 盆地周缘的山前冲断带圈闭的发现与落实受浅层砾石层影响严重,需要准确刻画巨厚、不等厚砾石层下伏构造。而直接利用地震速度建立速度场,变速成图时深转换的方法不能满足成图精度要求。针对巨厚、不等厚砾石层下伏构造的特点,总结多年山前复杂构造区速度建场及成图方法经验,运用适宜于巨厚、不等厚砾石层下伏构造速度建场及成图方法——砾石厚度雕刻成图法,消除巨厚砾岩影响,落实了独南构造,为下步独南构造的钻探提供了依据。更多还原

【Abstract】 The discovery and ascertain of traps in piedmont thrust belt on the rim of Junngar Basin have been severely affected by shallow gravel bed, and it is necessary to accurately portray the structure underlying the thick gravel bed of unequal thickness. However, the method of variable velocity mapping and time-depth conversion, which directly use seismic velocity to build velocity field, can not satisfy the accuracy requirement for mapping. This paper describes the structure underlying the thick gravel bed of unequal thickness, generalizes the experiences of many years in velocity-field-built and mapping for complex piedmont structures, and uses a suitable method—gravel thickness sculpture mapping—for velocity-field-built and mapping of the underlying structure. Therefore, the impact of thick gravel bed has been eliminated, and the Dunan structure has been identified, thus provided basis for drilling in Dunan structure.更多还原