西昌盆地地震资料双排列采集及处理实践

Practice on the Double Spread Acquisition and Processing of Seismic Data in Xichang Basin

西昌盆地主要勘探目的层埋藏较深,断裂发育,构造破碎,原有地震资料的信噪比和分辨率较低,无法满足构造解释的需要。为此,针对西昌盆地的地震地质条件,兼顾采集设计要求和工作效率,在新一轮采集中,实施了一种双排列接收的观测系统。应用结果表明,新采集的资料剖面断裂清晰,目的层及其以上各反射层特征清楚,分辨率和信噪比均有较大提高。

The main exploration targets are characterized by small burial depth, developed faults and faulted structures in Xichang Basin. The original seismic data with low signal--to--noise ratio and resolution in the basin can not satisfy the requirements for structure interpretation. For this reason, aimed at the seismic geologic condition and given consideration to the requirements for seismic data acquisition design and work efficiency, an observation system with double seismic spreads has been used in a new round of seismic data acquisition in the basin. Application results show that faults, intended zone and various reflectors above the zone are clear on the newly collected seismic sections, and their resolution and signal--to--noise ratio are improved greatly.